Week 6 Challenge

aim-:

1. Summarize your study for the bending moment, shear force and deflection diagrams for the raft foundation in stadd and compare them with manual calculation for different set of loads. Fill of 1 m on top slab.

1) earth pressure 2) self-weight 3) Surcharge 4) 70R load

Ans-:

APPLY THIS LOADS IN STADD AND ANALYSE IT

Create nodes as centre line of wall to wall and create each intersection as node

Now assign the properties as rectangular and dimension to the each beam

take average of hunch as depth of beam

After assigning the whole properties the 3D view are as shown below

calculate spring constant as below

calculate earth pressure as below and apply it as follows

dead load

Maximum Bending Movement (Mz) = 579.35 kN-m

earth pressure

Maximum Bending Movement (Mz) = 187.830 kN-m

Maximum Shear Force (Fy) = 184.979 kN

Live Load Surcharge

Maximum Bending Movement (Mz) = 79.921 kN-m

Que 2. Based on the analysis design the members and outline the thought process in selecting the member sizes along with the raft foundation design.

ans-:

ULS combination

Maximum Bending Movement (Mz) = 679.023 kN-m

`Maximum Shear Force (Fy) = 475.23kn-m

DESIGN AS RCC SLAB

2. Detailing of reinforcement in the base slab.

ANS-: