新型框架阻尼填充墙性能分析

Performance analysis of a new-type damped infill wall

介绍了新型框架阻尼填充墙的构造方法,并剖析其原理;采用有限元方法分析空框架、普通填充墙框架与阻尼填充墙框架在单调静力荷载作用下的响应,揭示了阻尼填充墙的工作机制,对比研究了阻尼填充墙和普通填充墙的性能差异和优劣,结果表明:框架侧移时,阻尼填充墙的变形主要集中于剪切刚度较小、变形能力良好的粘弹性层,与普通填充墙相比,其变形能力明显提高,受力大为降低;阻尼填充墙能给主体框架提供一定的侧向刚度,有利于小震下结构的位移控制,但其刚度明显低于普通填充墙,能延长结构周期,减小结构在地震中所承受的地震作用。此外,阻尼填充墙对框架侧向变形造成的约束较普通填充墙大为削弱,能延缓主体框架形成塑性铰发生破坏。

The construction method of a damped infill wall（DIW） was presented,and its principle was also analyzed here.Moreover,the behaviors of a bare frame,a frame of a conventional infill wall（CIW） and a frame of DIW under a monotonic-static load were simulated with the finite element method.With the results,the working mechanism of DIW was revealed,and the performances of DIW and CIW were analyzed comparatively.It was shown that the masonry elements of DIW shift horizontally when its surrounding sways,and the deformation of DIW mainly focuses on its softer visco-elastic layers;by comparison with CIW,DIW has marked improvements in deformation capacity and bears much smaller force;DIW can provide a certain lateral stiffness to its frame,it is beneficial to the structural displacement control under small earthquakes;but its lateral stiffness is much lower than that of CIW,it means that DIW can prolong a structure＇s period notably and reduce the seismic action during earthquakes;furthermore,DIW produces a much weaker constraint to the lateral deformation of its frame than CIW does,and it can delay the destruction of the framework with the formation of plastic hinges.