钢筋混凝土自复位剪力墙抗震性能试验研究

Experimental study on seismic behavior of self-centering RC shear walls

自复位剪力墙是通过无黏结预应力钢绞线将预制墙板与预制墙板/基础连接成整体,其震后恢复能力良好。通过1个现浇钢筋混凝土剪力墙试件和3个自复位剪力墙试件的拟静力试验,研究了地震作用下自复位剪力墙的破坏特征、滞回性能、自复位特性及耗能能力等。研究结果表明:与现浇剪力墙相比,自复位剪力墙震后残余变形较小,破坏轻微,易于修复;自复位剪力墙滞回曲线捏拢明显,滞回环呈旗帜形;随着弯矩贡献比的增大,试件的自复位能力逐渐提高,但耗能能力有所下降。

The self-centering structure is a type of new structure that aimed to improve the restorability of structure after earthquake. Through low cyclic loading tests on one cast-in-place RC shear wall and three self-centering RC shear walls, different failure modes of the cast-in-place and the self-centering specimen were studied, and the effect of moment contribution ratio on the seismic performance of the self-centering shear wall was studied. The results indicate that compared with the cast-in-place shear wall, the self-centering specimens are damaged only slightly with small residual deformation and can be easily restored after earthquake. Pinching can be observed obviously in the hysteresis loops of the self-centering specimens, which makes the hysteresis loop flag-shaped. As the moment contribution ratio increases, the self-centering ability is improved, while the energy-dissipating ability decreases.