内置钢板钢筋混凝土剪力墙抗震性能研究

Study on seismic behavior of steel plate reinforced concrete shear walls

设计16个内置钢板钢筋混凝土剪力墙(简称SPRCW)试件,进行低周反复加载试验研究。根据试验现象与试验数据得到的滞回曲线、骨架曲线、延性系数、等效粘滞阻尼系数等参数,从强度、变形和能量等三个方面判别和评定试件的抗震性能;比较不同参数如高宽比、墙体厚度、钢板厚度等条件下试件的工作性能;研究细部构造措施如拉结筋和钢板上焊接栓钉等对于剪力墙受力破坏特征以及抗震性能方面的影响;对比SPRCW与普通钢筋混凝土剪力墙发现,钢板对于提高构件的抗震性能效果十分明显。通过对试验数据的拟合,研究了构件在地震作用下的恢复力特性,确定结构构件恢复力的计算模型,为结构非线性时程分析提供理论依据;利用试验数据拟合了内置钢板钢筋混凝土剪力墙的受剪承载力公式,可为制定该类型构件的相关规范提供参考。

In this paper, a total of 16 specimens were designed for the cyclic experiments of the composite shear wall, termed here as, ＇ Steel Plate Reinforced Concrete Shear Wall＇ （SPRCW）. Seismic behaviors such as load carrying capacity, deformation capacity and energy dissipation capacity were evaluated along with examinations on failure pattern, hysterics loops, skeleton curves, ductility index and viscous damping coefficient, etc. The combination of the following parameters were varied so as to compare their influence on structural response of the walls ： the aspect ratio, thickness of the wall, thickness of the steel plate, and shear connections like ties passing through holes in the steel plate and studs welded on the steel plate. Another major objective of this project is to conduct cyclic testing of both conventional reinforced concrete shear walls and innovative composite members, which offers support to show the effectiveness and potential of steel plate in SPRCWs as a major anti-seismic part. The incased steel plate is shown to be an effective way to improve the strength and deformation capacity of the shear wall. This research also qualitatively reveals the load path at different levels of loading and the ultimate damage pattern for different geometric types of wall. In addition, cyclic behavior of SPRCWs is concluded in the form of mathematic expressions by the tool of linear regression method, which can potentially provide numerical guidelines for structural nonlinear analysis in the future. The formula for calculating maximum shear capacity of SPRCWs is also suggested according to the experimental results and thus can be applied for design code.