The 'static method' for seismic analysis of buildings (equivalent lateral force method) assumes:
Choose the correct answer
The building is flexible and resonates with ground
Building responds in fundamental mode (regular, low-rise); seismic force Vb=Ah×W distributed parabolically
Seismic load acts downward
All floors have same seismic force
Correct Answer
B. Building responds in fundamental mode (regular, low-rise); seismic force Vb=Ah×W distributed parabolically
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ELF method (IS 1893): assumes the building responds in its fundamental mode (valid for regular, short buildings — T < 0.4 s). Design base shear Vb = Ah × W (Ah = design horizontal coefficient, W = seismic weight = DL + 50% LL). Distribution: Fi = Vb × Wi×hi² / Σ(Wj×hj²) (parabolic for first mode). For irregular or tall buildings (T > 0.4 s): dynamic analysis (response spectrum) required.
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