内置FRP管的钢管混凝土边框剪力墙抗震性能研究

The fiber-reinforced composites (FRP) tube are distributed in concrete filled steel tubes (CFST), and the composite element is combined with the end of concrete shear wall. The shear wall with the CFST and FRP tubes can improve the bearing capacity and the second-order stiffness significantly and reduce the second-order effects of components, as the result the seismic performance of the shear wall is improved because of the confinement effect, and higher performance index can be achieved to resist the highly random earthquake. This project will take the new shear wall with CFST and FRP tubes as the study target and research the seismic performance using the method combined with experimental study, numerical simulation and theoretical study. The quasi-static loading test will be conducted to the shear wall with CFST and FRP tubes with different parameters. According to the results of comparative experiments and the analysis of numerical simulation, the optimization principle on the material and geometrical parameter of the shear wall with CFST and FRP tubes is established, and then the design formulas of the bearing capacity and stiffness are derived. Based on the theoretical analysis and above research results, a simplified calculation model of the shear wall with CFST and FRP tubes can be explored, and the validity of the model should be verified and modified by the results combined with test data and numerical simulation. The research production can be the foundation of the design method and application of the shear wall with CFST and FRP tubes. The achievement will broaden the application field of composite structure in structural engineering and provide a basis in formulating and revising the relevant codes.

将纤维增强复合材料（FRP）管布于钢管混凝土内，设置在剪力墙端部形成内置FRP管的钢管混凝土边框剪力墙，可以明显提高剪力墙的承载力和二阶刚度，降低构件的二阶效应，改善剪力墙的抗震性能，达到更高的性能目标来抵御具有高度随机性的地震。本项目以内置FRP管的钢管混凝土边框剪力墙为研究对象，采用试验研究、数值计算和理论分析相结合的方法，对具有不同参数的内置FRP管的钢管混凝土边框剪力墙进行拟静力加载试验，通过对比试验和对精细化数值模型的计算分析研究该新型组合剪力墙的抗震性能，并建立内置FRP管的钢管混凝土边框剪力墙性能化设计的参数优选原则；同时基于理论分析开发内置FRP管的钢管混凝土边框剪力墙的简化计算模型，结合试验结果和数值模拟对其进行验证和修正。本项目的研究为内置FRP管的钢管混凝土边框剪力墙设计方法研究和应用的基础，成果将拓宽组合结构在结构工程中的应用，为相关标准的制定和修订提供依据。

内置FRP管的钢管混凝土边框剪力墙是一种抗震性能优良的新型组合剪力墙，对其抗震性能和设计方法进行研究具有明确的科学和工程意义。本课题基于原定研究目标，结合本课题前期的相关研究成果，主要完成了：①内置FRP管的钢管混凝土边框剪力墙的抗震性能试验研究，通过与普通混凝土剪力墙、钢管混凝土边框剪力墙的对比分析，对内置FRP管的钢管混凝土边框剪力墙的滞回性能、骨架曲线、强度与刚度退化、和耗能能力等抗震性能进行了研究，验证了该新型组合剪力墙的优良性能；②基于试验研究结果，采用Abaqus通用有限元软件，对内置FRP管的钢管混凝土边框剪力墙进行了数值模拟分析，通过与试验结果的对比，验证了有限元模型的正确性和适用性，并开展了设计参数分析，为后续研究提供依据；③基于内置FRP管的钢管混凝土边框剪力墙的受力机理，采用等效应立法，同时对约束混凝土的本构进行了一定的简化，建立了该新型组合剪力墙的承载力计算公式，通过与试验结果和数值模拟结果的对比，验证了该公式的正确定和适用性；④采用多垂直杆单元模型，结合试验结果与数值模拟分析，建立了内置FRP管的钢管混凝土边框剪力墙的简化计算模型。⑤对内置FRP管的钢管混凝土边框剪力墙的设计参数进行优化，同时设计了内置FRP管多腔钢-混凝土组合剪力墙，对其进行了抗震性能试验，进一步提高了组合剪力墙的性能和耗能能力。本项目的研究成果在一定程度上改善了剪力墙的性能，拓宽了在结构工程中的应用，为后续的相关研究提供依据。. 基于本课题已发表发表学术论文9篇，其中SCI（JCR一区）4篇；获得国家专利4项；参加国内外学术会议20余人次；培养毕业研究生6人，在读博士研究生1名，硕士研究生13名。