Static Load Cases

 

 

Define static load cases, or modify or delete previously defined load cases.

Static analysis is carried out for each static load case entered by this function. The analysis results can be interactively combined in "Combinations". Apply this feature to assign the load cases necessary to form the geometric stiffness matrix in the P-Delta or buckling analysis.

When Bridge Wizard is used to analyze the construction stage of a bridge structure, static loads are automatically generated based on the characteristics of loads. (refer to Name)

The procedure for carrying out a static analysis using midas Civil is as follows:

1. Enter the load cases using the Load>Static Load Cases menu.

2. Enter the loads using the various static load input functions of Load Menu.

3. If geometric nonlinear elements are included in the analysis model, create load cases based on the previously created load combinations through Load>Create Load Cases Using Load Combinations. Using the Analysis>Main Control Data menu, input the number of repetitions and permitted tolerance for convergence.

4. If the analysis is to reflect the P-Delta effect, use the Analysis>P-Delta Analysis Control menu to specify the number of repetitions and permitted tolerance for convergence followed by entering the load cases and factors applied to formulate the geometric stiffness matrix.

5. Select the Analysis>Perform Analysis menu or click 01-SLC-Perform_Analysis(i).jpg Perform Analysis to carry out the analysis.

6. Messages indicating the progress or the completion of analysis will appear in the message window at the bottom of the screen.

7. Upon completing the analysis successfully, use the various post-processing functions of the Results menu in conjunction with load cases and combinations to analyze the analysis results.

Note
The messages generated in the process of analysis are automatically compiled in the 'fn.out' file.

 

 

 

From the Main Menu Select Load > Static Load > Static Load Cases.

Shortcut key : [F9]

Click to the right of the Load Case Name field in the dialog boxes of various functions purposed to specify static loads to define or modify static unit load conditions.

 

 

 

0-check.jpg When defining or adding new static load cases

Enter the following items and click 01-SLC-Add(b).jpg.

Name: Static load case name

Note
When Bridge Wizard is used to analyze the construction stage of a bridge structure, the following static load cases are automatically generated based on the characteristics of the loads used. The Load Type of each individual load is automatically defined as Construction Stage Load.

Self Weight: Self weight of elements used in Construction Stage Analysis

Prestress: Prestressing load in tendons

FT: Self weight of Form Traveler when FCM Wizard is used

Wet Concrete: The weight of Wet Concrete when FCM or MSS/FSM Wizard is used

The above load cases are used to check the input in the preprocessing mode and combined in the Construction Load during the analysis. The analysis results can be checked for separate load cases automatically assigned to the construction stage analysis results. Refer to "Combinations" for details.  

Type: Select the load type from the list of static unit load cases.

Description: Enter a short description of the load case.

0-check.jpg To modify previously defined load cases

Select the relevant load case from the load cases list at the bottom of the dialog box, then modify the entries and click 01-SLC-Modify(b).jpg.

0-check.jpg When deleting previously defined load cases

Select the relevant load case from the load cases list at the bottom of the dialog box and click 01-SLC-Delete(b).jpg.

Note
The unit load case types are as follows: Note that the names of the unit load cases listed below can differ from the notation given in the codes.

User Defined Load (U)

Dead Load (D)

Live Load (L)

Roof Live Load (R)

Wind Load on Structure (W)

Earthquake (E)

Temperature (T)

Snow Load (S)

Rain Load (R)

Live Load Impact (IL)

Earth Pressure (EP)

Buoyancy (B): Buoyant force

Ground Water Pressure (WP): Hydraulic or water pressure

Fluid Pressure (FP)

Ice Pressure (IP)

Wind Load on Live Load (WL): Wind load acting simultaneously with the traffic live load

Longitudinal Force from Live Load (BK): Longitudinal force component due to horizontal live load

Centrifugal Force (CF)

Rib Shortening (RS): Rib Shortening

Shrinkage (SH): Effect of concrete shrinkage

Creep (CR): Effect of concrete creep

Prestress (PS): Pre-stressing force

Erection Load (ER): Load during construction

Collision Load (CO): Collision or impact load

Construction Stage Load (CS)

Note
The Load Type of a load case to be used in a construction stage analysis must be defined as "Construction Stage Load". Otherwise, the results of a general analysis for the corresponding load case, irrelevant to the construction stage analysis, will be produced in the "Final Stage" in the post-processing mode Stage Toolbar.

Braking Load (BL): Vehicle braking load

Settlement (STL)

Wave Pressure (WPR)

Crowd Load (CL)

Temperature Gradient (TG)