Moving Load Cases
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Use the entered vehicle load classes and the traffic lanes to create moving load cases. Define type of vehicle, number of lanes, and the method to be used in moving load analysis |
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From the Main Menu select Load > Moving Load > Moving Load Cases. |
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To enter new or additional moving load cases Click .
To modify previously entered moving load cases Select the moving load case to be modified in the dialog box and click .
To delete previously entered moving load cases Select the moving load case to be deleted in the dialog box and click .
Data entry method when is clicked.
When AASHTO is selected from Moving Load Code Load Case NameEnter the name of a moving load case. DescriptionEnter the description of the moving load case.
Load Case for Permit VehicleSelect this option if Permit Vehicle is defined from AASHTO LRFD Code User Define option. When this option is selected the dialog box changes to a number of input fields for Permit Vehicle.
Multiple Presence FactorEnter the scale factors for multi-lane vehicle loads. AASHTO specifies 1.0 for loading up to two lanes, 0.9 for loading 3 lanes and 0.75 for loading 4 lanes or more. Sub-Load CasesEnter the loading method and the traffic lane to be loaded by the vehicle load class in a moving load case. Loading Effect Combined: Combination of vehicle classes. If more than two vehicle classes are assigned in a Moving Load Case, then this function considers all combinations, including the cases where different vehicle classes are applied simultaneously. Independent: Apply the vehicle classes independently. If more than two vehicle classes are assigned in a Moving Load Case, then this function do not consider the cases where different vehicle classes are applied simultaneously. Note
To enter new or additional vehicle load class Click .
To modify previously entered vehicle load cases Select the vehicle load case to be modified in the dialog box and click .
To delete previously entered vehicle load cases Select the vehicle load cases to be deleted in the dialog box and click .
Data entry method when is clicked. [Details] Load Case DataVehicle ClassSelect the vehicle load class or directly enter the vehicle load.
Scale FactorEnter the scale factor for the application of the vehicle load class. Min. Number of Loaded LanesEnter the minimum number of lanes to be loaded by the vehicle load class. Max. Number of Loaded LanesEnter the maximum number of lanes to be loaded by the vehicle load class. Note Assign LanesSelect the lanes to be loaded by the vehicle load class. Assign the lanes to be loaded by the vehicle load class in the traffic lane list with the mouse and click to select. If previously selected lanes are to be removed from the selection, assign the lanes with the mouse and click to delete. Note When ‘Moving Load Optimization’ is selected:Multiple Presence FactorEnter the scale factors for multi-lane vehicle loads. AASHTO specifies 1.0 for loading up to two lanes, 0.9 for loading 3 lanes and 0.75 for loading 4 lanes or more. OptimizationMin. Vehicle Distance Enter the minimum vehicle distance in the transverse direction. The minimum distance between vehicles is determined as the larger between ‘Min. Vehicle Distance’ and ‘2 times margin’ entered from the ‘Moving Load Optimization’ dialog. 4 ft is recommended as per AASHTO Standard.
Load Case DataLoaded LaneSelect a carriageway defined in the ‘Moving Load Optimization’ dialog. Min. Number of Vehicles Enter minimum number of vehicles to be loaded within the carriageway width. Max. Number of Vehicles Enter maximum number of vehicles to be loaded within the carriageway width. Loading Effect Assign the method of combining vehicle loading conditions. Combined: Combination of vehicles. If more than two vehicles are assigned in a Moving Load Case, then this function considers all combinations, including the cases where different vehicles are applied simultaneously. Independent: Apply the vehicles independently. If more than two vehicles are assigned in a Moving Load Case, then this function does not consider the cases where different vehicles are applied simultaneously. Assignment Vehicle Selected Vehicle: Select a vehicle to be applied for the moving load optimization. Scale Factor: Scale factor for vehicle loads
Example: To find the critical results between HS20-44 and HS20-44L
When AASHTO LRFD is selected from Moving Load Code and Permit Vehicle is considered. Load Case Name Enter the moving load case name.
Description Enter the description of the moving load case
Load Case for Permit Vehicle Select this option if Permit Vehicle is defined from AASHTO LRFD Code User Define option. When this option is selected the dialog box changes to a number of input fields for Permit Vehicle.
Permit Vehicle Vehicle Choose the vehicle to be used. The user can only choose the vehicle that has been defined as Permit Vehicle Type.
Ref. Lane Select the reference lane to provide the location where Permit Vehicle travels.
Eccentricity Input the distance of the Permit Vehicle to the Ref. Lane. By looking towards the direction the vehicle travels, the right side is considered positive and the left side is considered negative.
Scale factor Enter the scale factor for the application of the vehicle loads. When Canada is selected from Moving Load Code Load Case NameEnter the name of a moving load case. DescriptionEnter the description of the moving load case. Multiple Presence FactorEnter the scale factors for multi-lane vehicle loads. CAN/CSA SA-06 specifies 1.0 for loading for one lane, 0.9 for loading 2 lanes, 0.8 for loading 3 lanes, 0.7 for loading 4 lanes, 0.6 for loading 5 lanes and 0.55 for loading 6 lanes or more. Sub-Load CasesEnter the loading method and the traffic lane to be loaded by the vehicle load class in a moving load case. Loading Effect Combined: Combination of vehicle classes. If more than two vehicle classes are assigned in a Moving Load Case, then this function considers all combinations, including the cases where different vehicle classes are applied simultaneously. Independent: Apply the vehicle classes independently. If more than two vehicle classes are assigned in a Moving Load Case, then this function do not consider the cases where different vehicle classes are applied simultaneously. Note To enter new or additional vehicle load class Click . To modify previously entered vehicle load cases Select the vehicle load case to be modified in the dialog box and click . To delete previously entered vehicle load cases Select the vehicle load cases to be deleted in the dialog box and click . Data entry method when is clicked. [Details] Load Case DataVehicle ClassSelect the vehicle load class or directly enter the vehicle load. Scale FactorEnter the scale factor for the application of the vehicle load class. It is recommended that scale factor should not be used for taking into account dynamic load allowance as it is taken as per the code by midas Civil, automatically. Min. Number of Loaded LanesEnter the minimum number of lanes to be loaded by the vehicle load class. Max. Number of Loaded LanesEnter the maximum number of lanes to be loaded by the vehicle load class. Note Assign LanesSelect the lanes to be loaded by the vehicle load class. Assign the lanes to be loaded by the vehicle load class in the traffic lane list with the mouse and click to select. If previously selected lanes are to be removed from the selection, assign the lanes with the mouse and click to delete. Note Note When ‘Moving Load Optimization’ is selected:Multiple Presence FactorEnter the multiple presence factors as per CSA S6-14.
OptimizationMin. Vehicle DistanceEnter the minimum vehicle distance in the transverse direction. The minimum distance between vehicles is determined as the larger between ‘Min. Vehicle Distance’ and ‘2 times margin’ entered from the ‘Moving Load Optimization’ dialog. 1.2 m is recommended as per CSA S6-14.
Load Case DataLoaded LaneSelect a carriageway defined in the ‘Moving Load Optimization’ dialog. Min. Number of VehiclesEnter minimum number of vehicles to be loaded within the carriageway width. Max. Number of VehiclesEnter maximum number of vehicles to be loaded within the carriageway width. Loading EffectAssign the method of combining vehicle loading conditions. Combined: Combination of vehicles. If more than two vehicles are assigned in a Moving Load Case, then this function considers all combinations, including the cases where different vehicles are applied simultaneously. Independent: Apply the vehicles independently. If more than two vehicles are assigned in a Moving Load Case, then this function does not consider the cases where different vehicles are applied simultaneously. Assignment VehicleSelected Vehicle: Select a vehicle to be applied for the moving load optimization. Scale Factor: Scale factor for vehicle loads Example: To find the critical results between CL-625 Truck and CL-625 Lane.When BS is selected form Moving Load Code
When Vehicle is HA, HB or HA&HB Auto Live Load Combination In the case of HA&HB(Auto), combination of the Live Load is automatically organized based on the selected code. In the case of HA, HB or HA&HB, this option should be checked off.
Type of Design Combination Factor Select a limit state to determinate load factors to be applied to the moving load analysis results. Ultimate Limit State: Applies the load factor at ultimate limit state Serviceability Limit State: Applies the load factor at serviceability limit state
Combination of Loads Select a combination to determinate load factors to be applied to the moving load analysis results. Combination 1: Applies the load factor for combination 1 Combination 2 or 3: Applies the load factor for combination 2 or 3
Sub Load Case (When Vehicle is HA, HB, HA&HB, Pedestrian) Load Case Data Scale Factor: Enter the scale factor for the application of the vehicle loads. Number of Loaded Lanes: Enter the number of lanes to apply for Moving Load Cases. The selected lanes and the number of lanes inputted should be the same. Vehicles: Enter the type of vehicle to consider for Moving Load Cases Assign Lanes Assign the selected vehicles to lanes List of Lanes: Displays the list of lanes Selected Lanes: Select the lane HB Straddling Two Lanes: Becomes activated only in the case of HA&HB(Auto) Auto Live Load Combination In the case of HA&HB(Auto), combination of the Live Load is automatically organized based on the selected code. In the case of HA, HB or HA&HB, this option should be checked off.
Type of Design Combination Factor Select a limit state to determinate load factors to be applied to the moving load analysis results. Ultimate Limit State: Applies the load factor at ultimate limit state Serviceability Limit State: Applies the load factor at serviceability limit state
Combination of Loads Select a combination to determinate load factors to be applied to the moving load analysis results. Combination 1: Applies the load factor for combination 1 Combination 2 or 3: Applies the load factor for combination 2 or 3
Sub Load Case (When Vehicle is HA&HB (Auto)) If a number of Sub-Load Cases are defined in a Load Case, Min/Max result values from all the Sub-Load Cases are generated. That is, analysis is separately performed for each Sub-Load Case, and the Sub-Load Cases are not combined for analysis. Load Case Data Scale Factor: Enter the scale factor for the application of the vehicle loads. Number of Loaded Lanes: Enter the number of lanes to apply for Moving Load Cases. The selected lanes and the number of lanes inputted should be the same. Vehicles: Enter the type of vehicle to consider for Moving Load Cases Assign Lanes Assign the selected vehicles to lanes List of Lanes: Displays the list of lanes Selected Lanes: Select the lane HB Straddling Two Lanes: Select the two adjacent lanes on which HB loading shall occupy any transverse position. To use this function more than two Cross Beam Type lanes should exist. Auto Live Load Combination Select whether automatic live load combination is needed for pedestrian load.
Type of Design Combination Factor Select a limit state to determinate load factors to be applied to the moving load analysis results. Ultimate Limit State: Applies the load factor at ultimate limit state Serviceability Limit State: Applies the load factor at serviceability limit state
Combination of Load Select a combination to determinate load factors to be applied to the moving load analysis results. Combination 1: Applies the load factor for combination 1 Combination 2 or 3: Applies the load factor for combination 2 or 3
Sub Load Case (When Vehicle is HA, HB, HA&HB, Pedestrian) Load Case Data Scale Factor: Enter the scale factor for the application of the vehicle loads. Number of Loaded Lanes: Enter the number of lanes to apply for Moving Load Cases. The selected lanes and the number of lanes inputted should be the same. Vehicles: Enter the type of vehicle to consider for Moving Load Cases Assign Lanes Assign the selected vehicles to lanes List of Lanes: Displays the list of lanes Selected Lanes: Select the lane HB Straddling Two Lanes: Becomes activated only in the case of HA&HB(Auto)
When ‘Moving Load Optimization’ is selected:
In the case of HA&HB (Auto), combination of the Live Load is automatically organized based on the selected code.
Type of Design Combination Factor Select a limit state to determinate load factors to be applied to the moving load analysis results. Ultimate Limit State: Applies the load factor at ultimate limit state Serviceability Limit State: Applies the load factor at serviceability limit state
Combination of Loads Select a combination to determinate load factors to be applied to the moving load analysis results. Combination 1: Applies the load factor for combination 1 Combination 2 or 3: Applies the load factor for combination 2 or 3
OptimizationMin. Vehicle DistanceEnter the minimum vehicle distance in the transverse direction. The minimum distance between vehicles is determined as the larger between ‘Min. Vehicle Distance’ and ‘2 times margin’ entered from the ‘Moving Load Optimization’ dialog. For HB loads and special vehicles, only one vehicle is applied on the carriageway at the same time. Thus, 0 m is recommended for HA loads as per BS.
Load Case Data Loaded Lane Select a carriageway defined in the ‘Moving Load Optimization’ dialog. Number of Loaded Lanes Enter the number of lanes to apply for Moving Load Cases. Assignment Vehicle Selected Vehicle: Select a vehicle to be applied for the moving load optimization. Scale Factor: Scale factor for vehicle loads Example: To find the critical results for the combined HA and AB. When EUROCODE is selected from Moving Load Code Load Case Name Enter the name of a moving load case. Description Enter the description of the moving load case. Load Model
When ‘Moving Load Optimization’ is selected:Ignoreψ FactorCheck on to neglect ψ factor. If the traffic load is considered as Leading Variable Action in the load combination as per Eurocode 0, the moving load case for which the Ignore ψ option is checked on will be used. But if the traffic load is considered as Accompanying Variable in the load combination then the Load case corresponding to the one in which ψ is not ignored will be considered. To have all the required load combinations as per Eurocode 0, both the load cases should be made. The value of ψ is input in the definition of the vehicles. Load Case DataLM1: Here only LM1 can be selected which will be placed along with the straddling vehicle.LM3 (Special): Here only the straddling vehicles (LM3 SV/SOV) can be selected. The non-straddling LM3 vehicles cannot be selected here.OptimizationMin. Vehicle DistanceEnter the minimum vehicle distance in the transverse direction. The minimum distance between vehicles is determined as the larger between ‘Min. Vehicle Distance’ and ‘2 times margin’ entered from the ‘Moving Load Optimization’ dialog. For LM3 or special vehicles, only one vehicle is applied on the carriageway at the same time. Thus, 1 m is recommended for LM1 loads as per Eurocode. Assignment LanesLoaded LaneSelect a carriageway defined in the ‘Moving Load Optimization’ dialog. Num. of Loaded LanesEnter the number of lanes to apply for Moving Load Cases. Assignment VehicleSelected Vehicle: Select a vehicle to be applied for the moving load optimization. Scale Factor: Scale factor for vehicle loads Note: In Civil 2018 (v1.1), the remaining area for LM1 vehicle is not included in the moving load optimization. For now, it is recommended to define a lane separately for the remaining area and locate it on the carriageway and select the lane into the ‘Remaining Area’ box. This will be improved in a future release. Example: To find the critical results for the combined LM 1 and LM 3 (Special vehicle).
When Australia is selected from Moving Load Code Load Case NameEnter the name of a moving load case. DescriptionEnter the description of the moving load case. Load Case for Permit VehicleSelect this option if Permit Vehicle is defined from User Define Vehicles. When this option is selected the dialog box changes to a number of input fields for Permit Vehicle. Accompanying Lane FactorEnter the scale factors for multi-lane vehicle loads. AS5100.2 specifies 1.0 for the loaded lane giving the largest effect, 0.8 for the loaded lane giving the second largest effect, 0.4 for the loaded lane giving the third largest effect. Sub-Load CasesEnter the loading method and the traffic lane to be loaded by the vehicle load class in a moving load case. Loading Effect Combined: Combination of vehicle classes. If more than two vehicle classes are assigned in a Moving Load Case, then this function considers all combinations, including the cases where different vehicle classes are applied simultaneously. Independent: Apply the vehicle classes independently. If more than two vehicle classes are assigned in a Moving Load Case, then this function do not consider the cases where different vehicle classes are applied simultaneously. Note
To enter new or additional vehicle load class Click .
To modify previously entered vehicle load cases Select the vehicle load case to be modified in the dialog box and click .
To delete previously entered vehicle load cases Select the vehicle load cases to be deleted in the dialog box and click .
Data entry method when is clicked. [Details] Load Case DataVehicle ClassSelect the vehicle load class or directly enter the vehicle load. Scale Factor Enter the scale factor for the application of the vehicle load class. Min. Number of Loaded LanesEnter the minimum number of lanes to be loaded by the vehicle load class. Max. Number of Loaded LanesEnter the maximum number of lanes to be loaded by the vehicle load class. Note Assign LanesSelect the lanes to be loaded by the vehicle load class. Assign the lanes to be loaded by the vehicle load class in the traffic lane list with the mouse and click to select. If previously selected lanes are to be removed from the selection, assign the lanes with the mouse and click to delete. Note
When ‘Moving Load Optimization’ is selected:Accompanying Lane FactorEnter the scale factors for multi-lane vehicle loads. AS5100.2 specifies 1.0 for the loaded lane giving the largest effect, 0.8 for the loaded lane giving the second largest effect, 0.4 for the loaded lane giving the third largest effect.. OptimizationMin. Vehicle Distance Enter the minimum vehicle distance in the transverse direction. The minimum distance between vehicles is determined as the larger between ‘Min. Vehicle Distance’ and ‘2 times margin’ entered from the ‘Moving Load Optimization’ dialog.
Load Case DataLoaded LaneSelect a carriageway defined in the ‘Moving Load Optimization’ dialog. Min. Number of Vehicles Enter minimum number of vehicles to be loaded within the carriageway width. Max. Number of Vehicles Enter maximum number of vehicles to be loaded within the carriageway width. Loading Effect Assign the method of combining vehicle loading conditions. Combined: Combination of vehicles. If more than two vehicles are assigned in a Moving Load Case, then this function considers all combinations, including the cases where different vehicles are applied simultaneously. Independent: Apply the vehicles independently. If more than two vehicles are assigned in a Moving Load Case, then this function does not consider the cases where different vehicles are applied simultaneously. Assignment Vehicle Selected Vehicle: Select a vehicle to be applied for the moving load optimization. Scale Factor: Scale factor for vehicle loads When Australia is selected from Moving Load Code and Permit Vehicle is considered. Load Case Name Enter the moving load case name.
Description Enter the description of the moving load case
Load Case for Permit Vehicle Select this option if Permit Vehicle is defined from Australia Code User Define Vehicle option. When this option is selected the dialog box changes to a number of input fields for Permit Vehicle.
Permit Vehicle Vehicle Choose the vehicle to be used. The user can only choose the vehicle that has been defined as Permit Vehicle Type.
Ref. Lane Select the reference lane to provide the location where Permit Vehicle travels.
Eccentricity Input the distance of the Permit Vehicle to the Ref. Lane. By looking towards the direction the vehicle travels, the right side is considered positive and the left side is considered negative.
Scale factor Enter the scale factor for the application of the vehicle loads. When Transverse Moving Load is selected from the Moving Load Code Load Case NameEnter the name of a moving load case. DescriptionEnter the description of the moving load case. VehicleSelect the vehicle for analysis. In case of inputting a vehicle that has not been defined, click on [...] tab and define any vehicle load. Scale FactorEnter the scale factor for the application of the vehicle load class. Line LaneSelect the lane to be analyzed. Multiple Presence FactorEnter the scale factors for multi-lane vehicle loads. When India is selected from Moving Load Code Load Case Name Enter the name of a moving load case. DescriptionEnter the description of the moving load case.
Auto Live Load CombinationCheck on this option to define the Live Load Combinations according to the clause 207.4. of IRC: 6-2000. Check off this option for a user-defined Live Load Combination.
Multiple Presence FactorEnter the scale factors for multi-lane vehicle loads.
Number of Loaded LaneEnter the number of lanes to be loaded by the vehicle load class. This option will be activated only when Auto Love Load Combination option is selected. Sub-Load Cases• When Auto Live Load Combination is selected (When the Number of Loaded Lanes is '1') Scale factor Enter the scale factor for the application of the vehicle loads. Number of Loaded Lanes Vehicle Class Selection -Class I: The user can select either Class A, Class B or user-defined wheeled vehicles. Footway Loading Enter the load which will be applied to the remaining width of the carriageway when the number of loaded lanes is 1. (When the Number of Loaded Lanes is more then '2') Scale factor Enter the scale factor for the application of the vehicle loads. Number of Loaded Lanes Vehicle Class Selection -Class I: The user can select either Class A, Class B or user-defined wheeled vehicles. -Class II: The user can select either Class AA, Class 70R, Class 40R or user-defined wheeled/tracked/bogie vehicles.
• When Auto Live Load Combination is not selected Scale FactorEnter the scale factor for the application of the vehicle load class. Min. Number of Loaded Lanes: Enter the minimum number of lanes to be loaded by the vehicle loading. Max. Number of Loaded Lanes: Enter the maximum number of lanes to be loaded by the vehicle loading. Vehicle: All of the defined vehicles can be selected. Note If more than two vehicle classes are assigned in a Sub-Load Case, then this function considers all combinations, including the cases where different vehicle classes are applied simultaneously.
• Load Case for Permit Vehicle Select this option if Permit Vehicle is defined. When this option is selected the dialog box is changed to a number of input fields for Permit Vehicle.
Vehicle Choose the vehicle to be used. The user can only choose the vehicle that has been defined as Permit Vehicle Type.
Ref. Lane Select the reference lane to provide the location where Permit Vehicle travels.
Eccentricity Input the distance of the Permit Vehicle to the Ref. Lane. By looking towards the direction the vehicle travels, the right side is considered positive and the left side is considered negative.
Scale factor Enter the scale factor for the application of the vehicle loads.
To enter new or additional vehicle load class Click .
To modify previously entered vehicle load cases Select the vehicle load case to be modified in the dialog box and click .
To delete previously entered vehicle load cases Select the vehicle load cases to be deleted in the dialog box and click . When Russia is selected from Moving Load Code Load Case Name Enter the name of a moving load case. DescriptionEnter the description of the moving load case. Sub-Load CasesEnter the loading method and the traffic lane to be loaded by the vehicle load class in a moving load case. Loading Effect Assign the method of combining vehicle loading conditions. Combined: Combination of vehicle classes. If more than two vehicle classes are assigned in a Moving Load Case, then this function considers all combinations, including the cases where different vehicle classes are applied simultaneously. Independent: Apply the vehicle classes independently. If more than two vehicle classes are assigned in a Moving Load Case, then this function do not consider the cases where different vehicle classes are applied simultaneously. Note When 'Independent' is selected, we can check the envelope results for each vehicle class. When 'Combined' is selected, we can check the envelope results for the combinations of each vehicle class.
click .
select the vehicle load case to be modified in the dialog box and click .
select the vehicle load cases to be deleted in the dialog box and click .
When Poland is selected from Moving Load Code Load Case Name Enter the moving load case name.
Description Enter the description of the moving load case
Select Load Model Select one of the vehicle type. Vehicle S / Vehicle 2S / Permit Type Vehicle K Type Military Load Type Sub-Load Cases Enter the loading method and the traffic lane to be loaded by the vehicle load class in a moving load case. Loading Effect: Assign the method of combining vehicle loading conditions. Combined: If more than two vehicle classes are assigned in a Sub-Load Case, then this function considers all combinations, including the cases where different vehicle classes are applied simultaneously. Independent: Apply the vehicle classes independently. If more than two vehicle classes are assigned in a Sub-Load Case, then this function do not consider the cases where different vehicle classes are applied simultaneously. To enter new or additional vehicle load class, click and enter the following data. To modify previously entered vehicle load cases, select the vehicle load case to be modified in the dialog box and click . To delete previously entered vehicle load cases, select the vehicle load case to be deleted in the dialog box and click . Load Cases Data Vehicle Class: Select the vehicle load class. Min. Number of Loaded Lanes: Enter the minimum number of lanes to be loaded by the vehicle load class. Max. Number of Loaded Lanes: Enter the maximum number of lanes to be loaded by the vehicle load class. Assignment Lanes Select the lanes to be loaded by the vehicle load class. List of Lanes: Display the list of defined lanes. Selected Lanes: Select the lane to be loaded by the vehicle load. Assign the lanes to be loaded by the vehicle load class in the List of Lanes with the mouse and click to select. If previously selected lanes are to be removed from the selection, assign the lanes with the mouse and click to delete.
When ‘Load Case for Permit Vehicle’ is selected:
Load Case for Permit Vehicle Select this option if Permit Vehicle is defined from User Define option. When this option is selected the dialog box changes to a number of input fields for Permit Vehicle.
Vehicle Choose the vehicle to be used. The user can only choose the vehicle that has been defined as Permit Vehicle Type.
Ref. Lane Select the reference lane to provide the location where Permit Vehicle travels.
Eccentricity Input the distance of the Permit Vehicle to the Ref. Lane. By looking towards the direction the vehicle travels, the right side is considered positive and the left side is considered negative.
Scale factor Enter the scale factor for the application of the vehicle loads.
When ‘Moving Load Optimization’ is selected:OptimizationMin. Vehicle DistanceEnter the minimum vehicle distance in the transverse direction. The minimum distance between vehicles is determined as the larger between ‘Min. Vehicle Distance’ and ‘2 times margin’ entered from the ‘Moving Load Optimization’ dialog.
Load Case DataLoaded LaneSelect a carriageway defined in the ‘Moving Load Optimization’ dialog. Min. Number of VehiclesEnter minimum number of vehicles to be loaded within the carriageway width. Max. Number of VehiclesEnter maximum number of vehicles to be loaded within the carriageway width. Loading EffectAssign the method of combining vehicle loading conditions. Combined: Combination of vehicles. If more than two vehicles are assigned in a Moving Load Case, then this function considers all combinations, including the cases where different vehicles are applied simultaneously. Independent: Apply the vehicles independently. If more than two vehicles are assigned in a Moving Load Case, then this function does not consider the cases where different vehicles are applied simultaneously. Assignment VehicleSelected Vehicle: Select a vehicle to be applied for the moving load optimization. Scale Factor: Scale factor for vehicle loads When South Africa is selected from Moving Load Code NA/NB/NC Type NC + 2/3 NA Type Load Case Data User Defined (Sub-Load Cases) Enter the loading method and the traffic lane to be loaded by the vehicle load class in a moving load case. Loading Effect Combined: Combination of vehicle classes. If more than two vehicle classes are assigned in a Moving Load Case, then this function considers all combinations, including the cases where different vehicle classes are applied simultaneously. Independent: Apply the vehicle classes independently. If more than two vehicle classes are assigned in a Moving Load Case, then this function do not consider the cases where different vehicle classes are applied simultaneously. Note
Moving Load Optimization Moving Load Optimization is only applicable for NA, NB and User Defined vehicles. Note
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A1. Theoretically, the maximum possible moment due to a group of wheel loads does not occur at the center of simple span. We can find the location of maximum possible moment in the simple span by applying two things. 1. The maximum possible moment will occur at the wheel load which is closest to the resultant load of group of wheel loads. In case where the amount of the wheel load closest to the resultant load is small, the maximum possible moment can occur at the second closest wheel load. In your case, the group of loads consists of just two wheel loads with the same amount. If we denote it as P1 and P2, the closest wheel load can be either P1 or P2. If we take the closest wheel load as P1, the maximum possible moment will occur at P1. 2. If we denote the distance between the closest wheel load (P1) and the resultant load (R) as ‘d’, the location of P1 which causes the maximum possible moment will be d/2 away from the center of span as shown below. |
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