عنوان مقاله [English]
Nowadays, the uses of seismic isolators as earthquake resistant systems are rapidly increasing. So, in recent years, Iranian researchers have been doing a lot of research on seismic isolators, and results have been published as guidelines for seismic isolated buildings. But, in these regulations, the effects of the near- field earthquake seismic requirements are not mentioned. As earthquake magnitude increases, effects owing to duration, long-period ground motion and near source pulses become more important; in these respects, the current practice may be inadequate. For near-fault locations, the code section on base-isolated buildings requires site-specific analyses, which could produce satisfactory results if the ground-motion consultant makes a realistic recommendation.Near-field earthquakes due to their severe destructive effect are more important, such that extensive research on the different types of records and their impact on structures are investigated. This paper discusses the seismic requirements of buildings with seismic isolators subjected to multicomponent earthquakes. Parameters, such as the inter-story drift, distribution of earthquake force, and displacement of seismic isolators, have been studied, discussed, and compared the values proposed by the guidelines. In order to evaluate the seismic behavior of buildings with seismic isolation subjected to near-field earthquakes, the study included four groups of structures: three- , five- , seven-, and ten-story; each of the four groups of buildings with base isolators was designed for five periods as: 1, 1.5, 2, 2.5, and 3 seconds. For structural analysis of the supposed models, the OpenSees software was used and P-$\Delta$ effects were considered in the analysis. Each of the structures was analyzed under multi-component non-linear time history of earthquake.According to the result, the results of the method of equivalent static values and those of time history analysis are different; by increasing the period of structures, the non-uniform distribution of story shear in elevation is deformed to uniform distribution.