边缘配置高强纵筋装配式中高强再生混凝土剪力墙抗震性能研究#br#

为促进高性能绿色建筑结构发展，推动高强钢筋和中高强再生混凝土的工程应用，研发了边缘构件采用环筋扣合连接方式且配置高强纵筋的装配式中高强再生混凝土剪力墙，对6个剪跨比为2.2的装配式混凝土剪力墙进行了低周反复荷载试验。分析了不同再生粗骨料取代率、混凝土强度、边缘暗柱纵筋强度及搭接位置对装配式再生混凝土剪力墙的破坏形态、滞回性能、承载力、延性、刚度退化规律、耗能能力等抗震性能指标以及可恢复性能的影响。试验结果表明：边缘构件配置高强钢筋的装配式中高强再生混凝土剪力墙的破坏形态以弯曲破坏为主；再生粗骨料取代率对装配式中高强再生混凝土剪力墙的承载力、延性和耗能能力影响不大，各剪力墙均具有较好的抗震性能；边缘暗柱采用HRB600纵筋可有效提高装配式中高强再生混凝土剪力墙的承载力、耗能能力和可恢复性能；边缘暗柱纵筋在剪力墙底部塑性铰区搭接，会导致装配式中高强再生混凝土剪力墙的延性明显下降。给出了边缘配置HRB600纵筋的装配式中高强再生混凝土剪力墙水平承载力计算式，计算结果表明普通混凝土剪力墙的水平承载力计算模型同样适用于该装配式剪力墙结构。

Seismic behavior of prefabricated medium-high strength recycled concrete shear walls with high-strength steel bars in boundary elements

In order to promote the development of high-performance green building structures and the engineering application of high-strength steel bars and medium-high strength recycled concrete, a type of prefabricated medium-high strength recycled concrete shear wall with annular closed reinforcements and longitudinal high-strength steel bars in boundary elements was developed. The cyclic loading tests on six prefabricated concrete shear walls with a shear-span-ratio of 2.2 were carried out. The influences of replacement ratio of recycled coarse aggregate, concrete strength, longitudinal steel bar strength of embedded columns and lap position on seismic performance indexes including failure mode, hysteretic performance, bearing capacity, ductility, stiffness degradation, energy dissipation capacity and resilient behavior of prefabricated recycled concrete shear wall were analyzed. The test results indicate that the failure mode of the prefabricated medium-high strength recycled concrete shear wall with high-strength steel bars in boundary elements is mainly bending failure. The replacement ratio of recycled coarse aggregate has little influence on the bearing capacity, ductility and energy dissipation capacity of prefabricated medium-high strength recycled concrete shear wall. All specimens show good seismic behavior. Using HRB600 longitudinal steel bars in embedded columns can effectively improve the bearing capacity, energy dissipation capacity and resilient performance of the prefabricated medium-high strength recycled concrete shear wall. The ductility will decrease obviously when the longitudinal steel bars of the embedded columns are overlapped in the plastic hinge region of the prefabricated medium-high strength recycled concrete shear wall. The formula for calculating the horizontal bearing capacity of prefabricated medium-high strength recycled concrete shear wall with HRB600 longitudinal reinforcement was given. By comparing the calculation results, the calculation model of the horizontal bearing capacity of ordinary concrete shear wall is also applicable to the prefabricated shear wall structure.