内置碟簧自复位联肢剪力墙参数设计与滞回性能研究

PARAMETRIC DESIGN AND HYSTERETIC BEHAVIOR STUDY OF SELF-CENTERING COUPLED SHEAR WALL WITH EMBEDDED DISC SPRINGS

为了减小结构的震后残余变形,有效地避免墙肢破坏,该文提出并设计了一种内置碟簧装置的自复位联肢剪力墙(SC-CSW)。SC-CSW主要通过碟簧装置中的摩擦耗散地震能量,碟簧提供恢复力。建立了预压小于摩擦的SC-CSW1、预压大于摩擦的SC-CSW2及普通联肢剪力墙的有限元模型,对比分析了三者的承载能力、变形能力、耗能能力和自复位能力,结果表明:加载位移达到弹塑性层间位移限值时,SC-CSW1的累积耗能比普通联肢剪力墙降低28.03%,但其延性比普通联肢剪力墙提高至少2.94倍,能更好的满足大震下的位移需求;SC-CSW2的累积耗能比SC-CSW1降低15.83%,但其承载力提高,且最大残余位移比仅为0.09%,基本消除了残余变形,能满足结构功能可恢复的需求。

A self-centering coupled shear wall(SC-CSW)with embedded disc spring device,which can well reduce the residual deformation and effectively prevent the damage of the coupling wall of structures during earthquakes,is developed and designed.The seismic energy is mainly dissipated by friction and the restoring force is provided by disc springs in SC-CSW.The finite element models of SC-CSW1 with a pre-pressed force less than friction,of SC-CSW2 with a pre-pressed force larger than friction,and of the general coupled shear wall are built.And the comparisons of bearing capacity,deformation capability,energy dissipation and self-centering capabilities among SC-CSW1,SC-CSW2 and the general coupled shear wall are conducted.The results indicate that the accumulative energy dissipation of SC-CSW1 is reduced by 28.03%,compared with the geneal coupled shear wall when the loading displacement exceeds the limit of elasto-plastic interstory displacement,while its ductility is increased by 2.94 times at least than that of the geneal coupled shear wall.Therefore,the SC-CSW1 can better meet the displacement requirements under strong earthquakes.The accumulative energy dissipaton of SC-CSW2 is reduced by 15.83%,compared with SC-CSW1,but its bearing capacity is increased and the maximum residual displacement ratio is only 0.09%.The residual deformation of SC-CSW2 is basically eliminated,which can meet the earthquake-resilient demands of structures.