阻尼填充墙加固震损框架抗震性能试验研究

Experimental study on seismic performance of damaged frame reinforced by damped infill wall

提出先对震损框架进行局部修复,再采用阻尼填充墙对其进行加固的阻尼填充墙加固震损框架方法,设计制作震损修复框架(CRF)、阻尼填充墙加固震损框架(CRDIWF)以及阻尼填充墙框架(DIWF)三榀足尺试件,对其进行拟静力加载试验,对比研究三个试件的滞回性能、承载能力、耗能能力与延性、破坏特征等。试验结果表明:对震损框架先进行局部修复,再采用阻尼填充墙对其进行抗震加固的方法是可行的;试件CRDIWF的抗侧刚度、承载能力、耗能能力、位移及延性与DIWF基本相当,且均比试件CRF高;阻尼填充墙实现了既定的滑移耗能机制,释放了对框架的刚度效应和约束效应;试件CRDIWF、试件DIWF的破坏特征与试件CRF一致,破坏时层间位移角为1/37,满足《建筑抗震设计规范》中罕遇地震作用下层间位移角1/50的要求,具有良好的抗倒塌能力;为保证阻尼填充墙工作机制与耗能机制的实现,阻尼填充墙砌体单元的砂浆剪切强度应大于SBS阻尼层的剪切强度。

A new seismic retrofitting method is proposed to partly repair the damaged frame and then use damped infill wall to reinforce the repaired frame. Three full scale specimens, named carbon-fiber repaired frame （CRF） , carbon- fiber repaired frame with damped infill wall （CRDIWF） and damped infill wall frame （DIWF）, are designed to eontrastively study the hysteretie performance, carrying capacity, energy dissipation capacity, ductility and failure characteristics by quasi-static experiment. The results show that, the new seismic retrofitting method to partly repair the damaged frame and then use damped infill wall to reinforce the repaired frame is of feasibility. The lateral stiffness, carrying capacity, energy dissipation capacity and ductility of CRDIWF are basically equivalent to DIWF, and all are higher than those of CRF. The sliding-energy dissipation mechanism of damped infill wall is realized. And the stiffness effect and constraint effect, which is applied to frame by conventional infill wall, are released. There is no difference between the failure characteristic of Specimen CRIDWF, DIWF and CRF. Three specimens are destroyed at the interlayer displacement angle 1/37, which meet the requirement mentioned in the book ＂Code for Seismic Design of Buildings＂ that the interlayer displacement angle is greater than 1/50 under severe earthquake. Three specimens possess a good ability to resist collapse. The shear strength of the mortar of the damped filling wall should be greater than the shear strength of SBS damping layer in order to ensuring the working mechanism and energy dissipation mechanism of damped filling wall realize successfully.