Challenge 4

Aim: Prepare a longitudinal model of I-girder and analyse for all the loads with following specifications.

Introduction:

Given Data of girder are

1. Grillage model of 4 I-girders with span length of 27.0m.
2. Having supports at 0.700m from both ends.
3. Having following geometrical properties:

End Section: Area = 1.218m2

Iy = 0.32541m4

Iz = 0.05129m4

Mid Section: Area = 0.87702m2

Iy = 0.27835m4

Iz = 0.02622m4

4. Having material properties: Concrete, M60 grade

Other data's are assumed.

Procedure: Preparation of STAAD Model

Step 1: Create Nodes with span length of 27m.

Step 2: Join the Nodes to create Beams:

Step 3: To create 4 girders Translational Repeat is used in Z-direction with c/c spacing =2m

Step 4: Create internal diaphgrams at 2m distance in X-direction (assumed)

Step 5: Assign Supports:

i) Where all the moments are released

ii) To allow longitudinal movement we release FX in next support

iii) To allow transverse movement we release FZ

iv) We add roller support in X-Z plane

Step 6:Creating properties of girder and diaphgrams

Concrete is M60 therefore Compressive strength = 5000fck^0.5= 5000(60)^0.5=38729.83MPa , For Diaphgram

Step 7: Define Sectional Properties for I-girder

i) End Section

ii) Mid Section

iii) Tapering Section between end & mid girder (Avg of both)

Step 8: For Assigning Loads-->

i) Deadload--> S/W -1

ii) SIDL-->

Step 9: Applying moving loads For LiveLoad

Now Run Analysis.

Results: