【摘要】 提出了采用基础隔震和层间隔震并用的双层隔震体系,输入近断层地震记录,考察了破裂向前方向性和滑冲效应脉冲对隔震结构的影响。研究表明,采用双层隔震体系可比单独采用基础隔震体系取得更好的减震效果,滑冲效应脉冲比破裂向前方向性脉冲对双层隔震结构更具有破坏性。中间隔震层的位移幅值通常要比基础隔震层的位移幅值大,应注意控制中间隔震层的最大位移不超过容许位移。在破裂向前方向性和滑冲效应脉冲地震作用下,中间隔震层宜分别设置在结构的中下部和结构的中部左右方可取得较好的减震效果。更多还原

【Abstract】 The double isolation system composed of base isolation and story isolation is adopted under near-fault ground motions. In putting near-fault seismic records,the effects of rupture forward directivity and fling step pulse on isolated structure are studied. The research shows that the use of double isolation system can achieve better damping results than base isolation system. The fling-step pulse is more destructive to double isolation structure than the rupture forward directivity pulse. The displacement amplitude of intermediate isolation layer is usually larger than the displacement amplitude of base isolation layer,the maximum displacement of middle isolation layer should be controlled in the allowable displacement. In the rupture forward directivity and fling-step pulses earthquake,middle isolation layer should be respectively set in the lower part of the structure and the middle part of structure in order to obtain a better damping effect.更多还原