隔震支座拉伸刚度及高层隔震建筑地震响应研究

Study on tensile stiffness of isolator and earthquake responses of isolated high-rise buildings

本文对两个直径为600 mm的铅芯橡胶支座(剪切弹性模量G=0.392 MPa)进行了压剪及拉剪试验,测得了不同剪应变时拉伸刚度与拉伸屈服应力。在支座性能试验的基础上,建立了高宽比为4.5的高层建筑模型,通过改变拉伸刚度与压缩刚度比值,并采用与实测拉伸应力-应变曲线等效的双线性拉伸刚度模型,探讨了支座受拉后对高层隔震结构地震响应的影响。通过以上对比和计算,对高层建筑隔震设计支座拉伸刚度的设置提出了合理建议。

Based on the compression-shear and tension-shear tests of two LRBs（ G = 0.392MPa）, which are 600 mm in diameter, tensile stiffness and yield stress under different shear strain are tested. An isolated high-rise build- ing model with height-width ratio 4.5 is used as the numerical example, in which the tension stiffness of the LRB is changed from 1/5Kv to 1/20Kv, and the equivalent bilinear tension stiffness model based on the measured tensile stess-strain curve is used. Thus the effect of different tensile stiffness models on the earthquake responses of isolated high-rise building can be discussed. Finally, a reasonable value of the tensile stiffness of the rubber bearing is given for the design of isolated high-rise building.