SEISMIC POUNDING OF ADJACENT LINEAR ELASTIC BUILDINGS WITH VARIOUS CONTACT MECHANISMS FOR IMPACT SIMULATION

Abstract

This paper presents the comparative study of pounding response of multi-degree-offreedom (MDOF) system by using various impact simulation techniques. The prediction of impact response of three adjacent MDOF stick system is carried out by means of springdashpot contact element, which will be activated only when the masses of adjacent structures comes in contact. The stick model study is entirely being made on MATLAB programming tool. The few sets of obtained response of MATLAB programs are also been compared with the SAP results for the validation purpose. The entire investigation has been done by using nonlinear step by step time history method. The result indicates that the nonlinear contact spring impact simulation models give lesser magnitude pounding forces than that of linear contact spring impact simulation models, but as far as their numbers are concerned, they are marginally same in both the types. It was also noticed that in the exterior right flexible structure subjected to pounding for series of structures, the applied ground excitations offers unconventional pattern of absolute shear forces. That means the top storey of the exterior rigid structure during pounding may offer more values of shear forces than the immediately lower storeys.