RESPONSE OF MULTI-STOREY MASONRY BUILDING WITH SLIDINGSUBSTRUCTURE SUBJECTED TO BI-DIRECTIONAL EARTHQUAKEGROUND MOTIONS

摘要

To investigate seismic isolation feasibility, multi-storey masonry building with pure friction slidingsupport to horizontal bi-directional earthquake ground motions have been considered for the presentstudy. The building with sliding substructure is idealized as a four degree of freedom discrete mass modelfor computing its earthquake response. The coupled differential equations of motion of the building havebeen solved using Runga Kutta fourth order method. Effect of bi-directional interaction of the seismicforces on the building response have been compared with those without interaction. The investigationshave been made using the time period of the superstructure, mass ratio (base mass to superstructure mass),friction coefficient of the sliding support and damping coefficient as variant parameters. It was found thatneglect of bi-directional interaction effects leads to under-estimation of the sliding base displacement andto over prediction of the absolute acceleration of the superstructure.