高烈度区高层剪力墙结构隔震设计研究

Isolation design and analysis of a shear wall structure in high earthquake intensity region

对罕遇地震作用下加速度幅值为0.765g的某钢筋混凝土剪力墙结构橡胶支座隔震设计进行了研究。该结构高度为77.9m,高宽比为3.14,抗震设防烈度为8度(0.30g),近场影响系数取1.5,未采取措施时隔震支座同时受拉百分比达到43%。将设置初始间隙的可提离装置设置在周边隔震支座处,用于解决罕遇地震作用下隔震支座拉应力过大问题。分析结果表明,中震作用下结构层间剪力和倾覆弯矩减震系数最大值为0.38,罕遇地震作用下隔震支座的极小面压为0.09MPa,绝大部分支座无拉应力,隔震支座极大面压、水平矢量变形和结构抗倾覆安全系数均能够满足规范要求,结构能够满足"大震不倒"的抗震设防目标。

Rubber bearing design and its application in a reinforced concrete shear wall structure with acceleration amplitude of 0.765 g under rare earthquake is studied.The height of the structure is 77.9 m with the height width ratio of 3.14.The seismic fortification intensity is 8 degrees(0.30 g)and the near-field influence coefficient is1.5.When no measures are taken the simultaneous tension percentage of isolation bearing reaches 43%.The uplift device with initial clearance is set at the surrounding isolation bearing to solve the problem of excessive tensile stress of isolation bearing under rare earthquake.The results show that the maximum earthquake reduction coefficient of inter-story shear force and overturning moment is 0.38,the minimum surface pressure of isolation bearings is 0.09 MPa,and most bearings have no tensile stress.Vector horizontal displacement and maximum surface pressure of isolator,checking calculation of anti-overturning of structure are satisfy requirements of the design code.Objective of no collapse under rare earthquake can be achieved.