Analysis Of Structures With Base Friction Sliding Isolation

The technology of base isolation by constructing isolation layer at building base is used to isolate seismic energy so that it can抰 spread upward therefore , seismic response of structure is cut down . In all kinds of seismic isolation measures , base isolation technology is accepted and popular in the field of engineering , because of the feature simplify , facility , effective and economy . For base isolation technology is used widely in China, it is necessary to analyze and study the theory deeply. In this paper, base sliding isolation technology is discussed mainly, and according to interbedded shear model seismic response analysis program of structure with base sliding isolation is compiled by using Newmark抯 method . With this program , seismic response of middle and high isolated structures is analyzed and compared with that of fixed base structures . Analysis results indicate that base isolation technology has obviously seismic isolating effect, and decreases maximum response of structure sharply when earthquake occurs , and isolates seismic energy effectively . Moreover , the author analyzes how change of isolating parameters (stiffness , friction coefficient , damping) influences the isolating effect of isolated structure , and presents some referential suggestion about selecting isolating parameters.