09-10-2014, 04:13 PM
This work investigates the dynamic behaviour of multistorey buildings with end walls. In such buildings in-Plane flexibility can be important. The two models presented here treat the end walls as Timoshanko beams and floor system as an equivalent distributed flexure beam system or an equivalent distributed Timoshonko beam system. 'The analysis is performed for the symmetric modes of vibration. The governing differential equations and boundary conditions have been solved to obtain characteristic equation, the roots of which provide frequencies. These can then be substituted into expressions derived for the mode shapes. The Timoshenko-Timoshenko model presented here is the most generalized one and takes into account the combined effects of bending, shear and rotatory inertia. The method has been used for buildings with different heights and different spans to obtain their frequencies, mode shapes model participation factors and base shears. Depending upon the aspect ratios of walls and floors situations have been identified w7nere certain models may be important. For low