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5. Determine the lateral forces at different storey levels by dynamic analysis for the 3 storey OMRF
school building located in Zone 5 whose mode shapes and frequencies are given below. Consider
the cffect of at least the first 2 modes. http:/"mxww.kiilonline.com

Weight (kN)| Model | Mode 2 | Mode 3
Period (sec) 0.36 0.16 | ० |
Roof 640 1.000 1.000 1,000
2 floor 688 0.716 | -0.444 | -2.366
I floor 688 0.407 -0.579 27

6. a) Explain the philosophy of capacity design. (3 marks)
b) Plan of a building having 4 identical shear walls, each 4m long and 200 mm thick
is shown in Fig. 2. Determine the design lateral forces in the shear walls if the
storey height is 4 m and the seismic force is 450 KN in either direction. (6 marks)

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