预制拼装桥墩体系及其抗震性能研究进展

Research Process for Seismic Performance of the Prefabricated Concrete Pier System

预制拼装桥墩体系(Pre-fabricated Concrete PierSystem,PCP)抗震性能是影响其推广、应用的关键。为加快PCP在中、高烈度等复杂恶劣工程环境中的设计、施工与建造,首先综述了PCP节点连接的接缝形式、连接构造类型及典型工程示例,指出了PCP常用3种接缝形式和6种连接构造力学性能的研究现状及其优缺点;其次,系统地梳理了PCP抗震性能的研究进展,分析了不同连接条件下PCP的抗震性能,明晰了现有PCP抗震性能研究的不足及未来研究方向;最后,详细地论述了PCP抗震性能提升方法的研究前沿,探究了耗能延性构造的设置、高性能材料的应用、新型装配式节点构造设计以及新型混合预制桥墩体系的提出等PCP抗震性能提升方法的优缺点和发展方向。结果表明:通过对装配式节点的合理设计以及薄弱区域的预处理,预制拼装桥墩体系的抗震性能能够达到“等同现浇”的设计原则。然而PCP在复杂恶劣工程环境中的推广应用仍面临以下关键问题:PCP既有节点连接方式、体系和改进措施的抗震性能研究成果亟需归纳;新型节点连接方式、新体系和新型改进措施亟待提出,相关抗震性能有待验证;既有和新型PCP抗震性能的理论分析及抗震设计方法尚需完善;适用于复杂恶劣环境的预制拼装桥墩设计、施工标准亟需制定。

The seismic performance of the prefabricated concrete pier system(PCP)is a key factor affecting its promotion and application.To promote the design,construction,and fabrication of PCP in complex and harsh environments(including medium-and high-intensity areas),this study first reviewed joint forms,connection structures,and typical application examples of the PCP.Recent findings on the mechanical properties of three frequently used joint forms and six frequently used connection structures were included.The advantages and disadvantages of these joint forms and connection structures were summarized.Subsequently,the research process for the seismic performance of the PCP was systematically analyzed by considering different connection conditions.The deficiencies of existing studies on the seismic performance of the PCP were clarified.Future study directions on this topic were indicated.Finally,methods for improving the seismic performance of the PCP were discussed in detail.The advantages and disadvantages of the recent improvement methods for the PCP were explored,including the installation of energy-dissipating ductile structures,the application of high-performance materials,and the introduction of newly fabricated joints and newly fabricated pier systems.Possible development directions for improvements in the seismic performance of PCPs were also concluded.The results show that the seismic performance of the PCP can reach the design principle of equivalent cast-in-place through reasonable designs of fabricated joints and preconditioning of weak areas.However,the application of the PCP still faces the following key problems in complex and harsh environments:the research findings on the seismic performance of PCPs need to be summarized with consideration of existing connection structures,systems,and improvement measures.New types of connection structures,systems,and improvement measures for PCPs still need to be proposed.The relevant seismic performance of these new PCPs needs to be verified.Moreover,the theoretical analysis and seismic design methods for existing and new PCPs need to be improved.Relevant technical standards need to be formulated.