Week 12 Challenge
Design of Foundation in STAAD Foundation
1. Isolated Footing
Design isolated footing for a column 300 mm x 450 mm, carrying axial load of 1500 kN and Mu = 150 kNm using STAAD. Foundation. Assume that the moment is reversible. The safe bearing capacity of the soil is 200 kN/m2 at a depth of 1 metre from ground level. Use M 25 and Fe 415 for the footing. Also validate the design through hand calculation.
Procedure:
- Open STAAD Foundation Software, and Create a New General Foundation.
- Then Setup Units as SI Unit.
- In Main Navigator Window, select Column Position and give the coordinates as (0,0,0).
- Click Column Dimension and give Length and Width as 0.45 and 0.3 m
- Now go to Loads & Factors menu, then click Create New Load cases.
- Then Add New Load cases of Dead Load and Live Load as Fy = -1500 kN and Mu = 150 kNm.
- Now Generate Load Combination as per Indian Standard as shown below.
- Create a New Job in Job Setup menu.
- Set Job Name as Isolated Footing and Job Type Isolated.
- And set Design code as Indian (IS456:2000).
- Then select all Load Cases and Create Job.
- Now go to Design Parameter.
- Click Concrete & Reinforcement, Give input as shown below.
- Then set Cover & Soil, set Soil bearing capacity as 200 kPa.
- And Minimum % of Contact area for Ultimate loads as 90%.
- Now Footing Geometry, Set Minimum and Maximum Dimensions for Footing.
- Select Design option and Software will analyze and design the Footing.
Manual calculations:
2. AIM: Combined Footing
Design a combined footing using STAAD. Foundation for two columns C1, 400 mm x 400 mm carrying a service load of 800 kN and C2, 300 mm x 500 mm carrying a service load of 1200 kN. The column C1 is flushed with the property line. The columns are at 3.0 m c/c distance. The safe bearing capacity of soil is 200 kN/m2 at a depth of 1.5 m below the ground level. Use M 20 and Fe 415 for columns and footing.
Procedure:
Open Staad foundation
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