Week 3 Challenge

Week 3 Challenge – Explanation

Inputs data:

* I-Girder beam to be designed.

* Center to center distance of piers along the width of the bridge deck is 26m.

* Span of the bridge is 25m.

* Pier height is 10m.

Problem:

*To apply the IRS Railway loads

*To model in Staad pro and perform the structural analysis

Solution:

IRS – Indian Railway Standard.

Purpose of designing and constructing Railway related structures.

The various IRS loads for design.

• Metro Rail loading
• Broad Gauge loading
• Electric Train loading
• Gauge ‘A’ and Gauge ‘B’ loading

Metro live load :

Axle loading = 17 Tons

A maximum number of cars = 6 nos.

Wheel configuration, length (a) = 2150 (mm), (b) = 2200 (mm, (c) = 12400 (mm)

Length of car = 21100 (mm)

Assume:

Pier column size = 2.3m dia.

I-Girder beam size = Tapered (F1) =1.6m, (F2) =0.3m, (F3) =1.6m, (F4/F6) =2.0m, (F5) =0.3m.

Longitudinal beam size = Rect. 2.0m x 2.0m

Deck slab thick = 350mm.

Modeled in Staad.

Member properties created and assigned.

Support as fixed given.

Load application:

Vehicle load definition made

Type-1 loading created and assigned.

Type-2 loading created and assigned.

Type-3 loading created and assigned.

Refer staad model attached for the load applied.

Load cases generated:

Load cases 1 to 9 were created and applied for Type-1 loading.

Load cases 10 to 18 were created and applied for Type-2 loading.

Load cases 19 to 27 were created and applied for Type-3 loading.

Performed Analysis.

Results:

Bending Moment diagram for LC-7.

Forces in Graphs.

Plate Stress results for LC-6.

Refer Wee 3-Challenge document for a detailed report and

Staad model for the worked-out problem is attached.