超高性能混凝土预制剪力墙抗震性能研究

With good physical mechanical properties, ultra-high performance concrete (UHPC) is expected to provide new ways to reduce super high-rise structure shear wall thickness and dead weight. Steam curing is necessary for UHPC components to better develop mateical performance. It is suitable to make constructions by employing prefabrication industrialization. Thus, conducting UHPC precast shear wall seismic performance researches is a basic scientific issue pushing engineering application. This project makes systematic quasi-static tests and theoritical researches of component seismic performance, obtaining seismic designment methods of stirrup ratio, axial compression ratio limit, bearing capacity calculation based on displacement ductility. It also makes researches on UHPC procast shear wall vertical steel barspliced by pressed sleeve’s stress mechanism and failure mode under different interface construction and connection joint height, and gets horizontal joint shear bearing capacity calculation methods. Thus, it proposes UHPC precast shear wall rational structure construction, providing theoretical and experimental basis for the application of UHPC precast shear wall.

超高性能混凝土（ultra-high performance concrete,UHPC）以其良好的物理力学性能有望为超高层结构剪力墙截面厚度的减薄和自重减轻提供新途径。但UHPC构件要更充分地发挥材料性能，一般需高温蒸养，而这恰好适合以预制工业化的方式进行施工，因此对UHPC预制剪力墙展开抗震性能研究是推动其工程应用的基础科学问题。本项目将进行UHPC预制剪力墙构件及水平接缝抗震性能研究，对构件抗震性能进行系统的拟静力试验和理论研究，获得基于位移延性的配箍率、轴压比限值、承载力计算等抗震设计方法；对UHPC预制剪力墙竖向钢筋套筒挤压连接在不同界面构造、接缝高度下的受力机理和破坏形态进行研究，建立水平接缝受剪承载力计算方法。进而提出UHPC预制剪力墙合理构造。为超高性能混凝土预制剪力墙的应用提供理论及试验基础。

超高性能混凝土预制剪力墙符合建筑工业化国家战略，能够为超高层结构剪力墙截面厚度的减薄和自重减轻提供新途径。本项目基于纤维模型对UHPC预制剪力墙构件及带端柱高性能混凝土剪力墙构件进行了较系统的抗震性能分析，提出了轴压比限值、合理配筋率等设计建议，同时对UHPC预制墙构件斜截面承载力、开裂荷载进行了系统研究，提出了相应的计算公式。为了研究UHPC预制墙水平接缝的受剪机理，项目组设计了竖向钢筋采用套筒挤压连接的UHPC预制墙水平接缝试件，并进行了受剪性能试验，重点研究了连接钢筋配筋率、接缝构造、轴向压力对受剪破坏形态、荷载-位移曲线、承载力的影响规律，提出了相应的计算方法和合理构造。此外，项目组对普通混凝土剪力墙受剪承载力、UHPC梁受剪承载力、UHPC柱轴心受压承载力的可靠度进行了研究。依托本项目，已发表和录用学术论文7篇（其中SCI论文4篇，EI论文2篇），申请相关专利2项，部分成果被湖南省工程建设地方标准《DBJ43/T325-2017 活性粉末混凝土结构技术规程》采用。