Option for Dynamic
factor ( SK, Subway Trains, Tramcars )
Select
the material and the bridge type for the calculation of Dynamic
factor as per the Russian Moving Load Code. Dynamic Factor can
be defined in the Vehicles dialog box.
Material Type
Select
the material type as RC, Steel and SRC.
Bridge Type
Select
the bridge type as Rail Road Bridge, Subway, Tram or Rail Road
Bridge, Subway, Tram ( Main Truss Only) or Rail Road Bridge, Subway,
Tram ( Combined Bridge) for Steel and SRC type of material and
Rail Road Bridge, Subway, Tram or Rail Road Bridge , Subway, Tram
for RC.
Truck/Train Load Control Option
Set
the method of performing moving load analysis using vehicular
loads and the method of applying loads.
Analysis Method
Set the moving load analysis method.
Load Point Selection
Set the selection method for application location of vehicular
loads.
Influence Line Dependent Point
This is a method which controls the vehicular loads in a moving
load analysis according to the influence values.
Maximum value(+): From the locations
of the applied loads only the loads that result in positive influence
values are used in the computation.
Minimum value(): From the locations
of the applied loads, only the loads that result in negative()
influence values are used in the computation.
This
method is used for general vehicular loading and yields results
larger than that from the All Points method because the loads
are controlled according to the influence values.
All Points
This is a method which analyzes the structure for applied vehicular
loads in the moving load analysis at all locations without controlling
the influence values.
The method
is used for train loading and yields results smaller than that
from the Influence Dependent Point method because the loads are
not controlled according to the influence values.
Influence Generating Points
Number / Line Element
Assign the number of reference points on a line element for moving
loads and drawing influence line in an influence line analysis.
The accuracy of results increases with the increase in the number,
but the analysis time may be excessive. If the length of beam
element assigned with traffic line lane or plate elements assigned
with traffic surface lane is large, then the "Influence Generating
Point No. / Line Element" should be increased for more accurate
analysis.
Distance between Points: Assign
the distance between the consecutive reference points on a line
element for moving loads. The accuracy of results will increase
if the distance between the points decreases, but the analysis
time will increase. The user can manage the time and accuracy
by choosing the appropriate distance.
Analysis Results
Set
the position of the elements for which the moving load analysis
results are calculated.
Plate
For plate elements, member forces per unit length are calculated
as a result of moving load analysis. The form of member force
results is selected from below.
Center: Calculate the member
forces per unit length with respect to the centers of the elements
and the output results are produced for the entire elements.
Center + Nodal: Calculate the
member forces per unit length with respect to the element centers
and the nodes constituting the elements and produce the results
accordingly.
Stress Calculation: Assign whether
or not to calculate the stresses of plate elements.
Concurrent Force: Calculate
the corresponding moments under the conditions where the maximum
and minimum axial forces occur at each position. Similarly, calculate
the corresponding axial forces under the conditions where the
maximum and minimum moments occur at each position. The results
are then produced.
Note
1
The
following codes are provided for Plate Concurrent Force:
[AASHTO
Standard, AASHTO LRFD, AASHTO LRFD (PENNDOT), Canada, BS, EUROCODE,
Australia, Poland]
Also
available are Japanese, Taiwanese and Korean Codes
Note
2
How to view Concurrent
Force :
Menu  Results  Tables  Results
Tables  Plate  Force&Stress  Plate Force(UL:Local &
UCS)

'Click Right button on the mouse'  View by Max Value Item.
Frame
The moving load analysis results for Frame elements are produced
in the form of member forces pertaining to 5 Points of each member.
The form of member forces is selected from below.
Normal: Output member forces
with respect to 5 Points of each beam element.
Normal + Concurrent Force: Calculate
the member forces at 5 Points of the beam elements. Calculate
the corresponding moments under the conditions where the maximum
and minimum axial forces occur at each position. Similarly, calculate
the corresponding axial forces under the conditions where the
maximum and minimum moments occur at each position. The results
are then produced. To produce the results in a table format,
go to Result Tables > Beam > Force, rightclick and select
View by Max Value Item.
Combined Stress Calculation:
Assign whether or not calculate the combined stresses of frame.
Calculation Filters
Select
the nodes or elements to be included in the moving load analysis.
Reactions
Select and enter the supports where the moving load analysis results
related to reactions are to be obtained.
All: Select all supports.
Group: Use the Group identified in the model, and enter
the supports in the Group.
Displacements
Select and enter the nodes where the moving load analysis results
related to displacements are to be obtained.
All: Select all supports.
Group: Use Group to enter nodes.
Forces/Moments
Select and enter the elements where the moving load analysis results
related to member forces are to be obtained.
All: Select all elements.
Group: Use Group to enter elements.
Bridge Type for Impact/CDA
Calculation
(India code only)
Select
the bridge type for the automatic calculation of the impact factor.
When the user defines a Traffic Line Lane with an Impact Factor,
midas Civil will ignore this option.
Note
Impact (Clause 211 of
IRC: 62000)
Railway Bridge
Information (India code only)
Tracks: Select
whether the bridge will carry single, double or multiple tracks.
This detail is used in calculation of Coefficient of Dynamic Augmentation
(CDA) as per IRS Bridge rules under clause 2.4.
Longitudinal Load Dispersion
Sleeper Width
Type 1: Classification as per IRS Bridge
rules clause 2.3.4.2. Single sleeper under both rails at a location
Type 2: Classification as per IRS Bridge
rules clause 2.3.4.2. Single sleeper sear under each individual
rail at a location
Depth of Fill (d)
To
modify CDA as per IRS Bridge rules clause 2.4.2.1
Maximum Successive
Vehicles (India code only)
Select
the maximum number of successive vehicles considered for moving
load analysis. A low number is suggested to decrease the Moving
Load Analysis time. 