Week 3 Challenge

AIM OF THE EXPERIMENT:-

To apply IRS railway loads on a given bridge section and model it in Staad Pro.

DATA GIVEN:-

Width of the bridge is 26m.

Span of the Bridge Deck=25m

Girder Type=I Section

No. of Girders=8 Nos.

THEORY:-

IRS- INDIAN RAILWAYS STANDARD

• IRS code were developed by Indian Railways for the purpose of Design and Construction of Railway related structures.
• Types of IRS Loads for Design of Bridge Includes:-

1. Metro rail Loadings
2. Broad gauge Loadings
3. Electric Train
4. Gauge A & Gauge B Loadings

PROCEDURES:-

Assumptions

• Deck slab thickness=0.3m or 300mm
• I-section girder with uniform thickness
• Pier cap of 2.5m X 2.5m
• Material is of Concrete
• 4 Nos. of Pier of 2.3m x 2.3m

Step 1.

• Model it in Staad Pro. V8i
• Along Z axis-carriageway width
• Along X axis-span of the bridge
• Girders were model as per the figure

Fig:-Plan of the bridge

Fig:-Isometric view of the Bridge

Step 2:-

• Define the Property of the members
• For pier it is 2.3m x 23m
• For I-Girder

F1	1.6m
F2	0.3m
F3	1.6m
F4	2m
F5	0.3m
F6	1.5m
F7	0.3

• Plate thichness=0.3m

Fig:- Properties for I-Girder beam

Fig:- Properties for Piers

Fig:-Properties for Pier Cap

Step 3:-

• Adding supports beneath the girders and piers

Step 4:-

• Application of Loads on the model
• I have taken 2 units of metro car
• Applications of metro loading to the model
• As per IRS, axle loads for metro loadings = 170KN
• So, loading of each tyre=170/2=85KN
• Go to vehicle Definations

• Go to load cases details
• Select Load generation
• of Loads to be generated=100 (say)
• Annotate the Initial Point of Load
• Define increment value

Step 5:-

• Go to analysis and print
• Select No print option
• Go to Analyze menu bar
• Select run Analysis

Step 6:-

Go to Post-processsing to get the mximmum SF, BM

Plate stress contour

Report for max BM