INELASTIC DYNAMIC RESPONSE OF LATTICED TOWERS SUBJECTED TO RANDOM LOADS

Abstract

For latticed towers ,diagonal steel bracing members are efficient elements in resisting seismic motion , and therefore , they are frequently used to control the lateral displacements of structures .When such structures are subjected to earthquake motion of even moderate intensity ,bracing members typically yield in tention and /or buckle in compression .The research contains an analytical procedures for the inelastic dynamic analysis of space trusses using the step­ by-step implicit integration methods.Two methods for solving the dynamic governing equations are presented .These methods are the linear acceleration method and the constant average acceleration method .The formulation of displacement,velocity and acceleration are presented for each method. The above scheme of integration methods are explained and implemented in a computer program .The presented analytical procedure is used for the inelastic deterministic analysis , in time domain of structures subjected to seismic loads .The dynamic behaviour of a tower tank and a transmission Tower is investigated under EL-CENTRO earthquake for different cases. The elastic and inelastic responses are illustrated and compared for all different cases of loading . A brief summary , discussion of the results and conclussions are g ven..