**modes of deflection of tall buildings**which are discussed below

**.**The taller a building is, the greater the problem is of lateral and torsional stiffness. The deflection of a cantilever is a function of the loading, the properties of the structure and the height.

**Deflection of a cantilever**is given by following formula:

**deflection of tall building in bending**due to wind.

**shear deflection of tall building**due to wind action.