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基础隔震是通过在结构物与基础间设置隔震装置来延长结构自振周期并增大结构阻尼,从而阻止地震能量向上部结构传递以减小结构地震响应的一种技术手段。采用天然橡胶支座、铅芯橡胶支座、弹性摩擦滑板支座加阻尼器的组合基础隔震系统可以充分发挥不同减隔震器的特性并控制支座变形,从而达到良好的隔震效果。通过高烈度区乙类建筑工程实例,阐述了组合基础隔震系统的设计方法、支座选择与布置原则,以及设计过程中控制参数的验证。时程分析表明,组合基础隔震系统可以有效减小结构的地震响应;罕遇地震作用下,结构顶层X,Y向加速度响应可分别减小66.6%和73.6%;结构底层X,Y向层间位移角可分别减小65.2%和64.2%,剪重比可分别减小62.2%和64.3%。
Base isolation is a technical means of extending the natural period of the structure and increasing the structural damping by setting the isolation device between the structure and the foundation so as to prevent the transmission of seismic energy to the upper structure to reduce the structural seismic response. The combined base isolation system with natural rubber bearing, lead rubber bearing, flexible friction sliding plate bearing and damper can give full play to the characteristics of different reducing isolators and control the deformation of the bearing so as to achieve good isolation effect. Through the example of construction project of Category B in high intensity area, the design method of composite base isolation system, the principle of bearing selection and arrangement, and the verification of control parameters in the design process are expounded. Time-history analysis shows that the combined base isolation system can effectively reduce the seismic response of the structure. Under the rare earthquakes, the X and Y acceleration responses at the top of the structure can be reduced by 66.6% and 73.6%, respectively. The bottom X and Y layers The displacement angle can be decreased by 65.2% and 64.2% respectively, and the shear weight ratio can be reduced by 62.2% and 64.3% respectively.