预制装配式钢筋混凝土一体化剪力墙抗震性能研究及构造方案优化

Study on seismic performance and construction measures optimization of precast fabricated RC integration shear wall

针对预制装配式剪力墙结构,提出了内置空心管的混凝土填充墙与实体剪力墙墙肢一同浇筑生产、安装施工的预制一体化剪力墙结构。通过5个外形尺寸、墙肢和连梁配筋相同的混凝土双肢剪力墙的拟静力试验,探究了无填充、砌块砌体填充和一体化整体填充的剪力墙抗震性能,总结了这三类墙体的破坏形态、受力特点、承载与变形能力、刚度、延性和耗能能力的特点。试验结果表明:预制一体化剪力墙在水平往复荷载作用下发生弯剪破坏,相比于无填充墙试件和砌体填充试件,其抗侧刚度和受剪承载力有明显提高,同时具有良好的抗震性能。最后,基于Open SEES平台对拟静力试验结果进行了有限元验证,得到了吻合程度较好的滞回曲线、骨架曲线及墙肢纵筋应变;根据试验结果与有限元分析,提出了预制一体化混凝土剪力墙结构合理的填充墙构造方案。

For precast fabricated RC shear wall structure, a new kind of integration shear wall structure was proposed, which adopted the integration construction and fabrication method to construct the infilled wall with hollow pipes together with the wall legs. Five geometrically identical double-leg RC shear wall specimens with identical reinforcement in wall legs and coupling beams were constructed and tested under cyclic lateral loading to study the seismic performance of three types of walls, i.e. the integration wall, masonry infilled wall and wall without infill. The failure mode, stress feature, shear capacity, deformability, stiffness, ductility and energy-dissipating capacity were obtained. The test results show that, under cyclic lateral loading, precast integration shear walls fail due to the combined action of bending moment and shear force. Compared to the specimens infilled by masonry and without infill, integration shear wall owns better shear capacity, stronger stiffness and reliable seismic performance. Based on the finite element software OpenSEES, results of the quasi-static experiment were validated by FEA results of hysteretic curves, skeleton curves and the strain of longitudinal reinforcement. In addition, reasonable structural measures for the infilled precast integration shear wall were proposed according to the results of experiment and FE analysis.