BFRP模壳不排水加固桥墩的延性设计方法  

Design Method for Ductility of Bridge Piers Strengthened by BFRP Formwork

作　　者：吴凤英 杨纪豪 陈晖 夏樟华[2] WU Fengying;YANG Jihao;CHEN Hui;XIA Zhanghua(Xiamen City University,Xiamen,Fujian 361005,China;College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]厦门城市职业学院,福建厦门361005 [2]福州大学土木工程学院,福建福州350108

出　　处：《水利与建筑工程学报》2023年第2期74-80,107,共8页Journal of Water Resources and Architectural Engineering

基　　金：福建省自然科学基金项目(2020J1477);厦门市建设局科技项目(XJK-2021-1-19)。

摘　　要：针对桥梁桥墩受到水流冲刷发生损坏的问题,BFRP模壳加固桥墩是一种新型的不排水加固桥墩的方法,但缺乏针对BFRP模壳加固后桥墩抗震性能的分析方法。因此,在试验的基础上,建立了BFRP模壳加固桥墩位移和延性系数、材料性能参数,包括BFRP约束混凝土的极限压应变、BFRP配箍率、BFRP有效极限抗拉强度和BFRP有效极限抗拉应变等之间的力学计算模型,提出了基于目标延性系数提高指标的BFRP模壳抗震延性加固设计方法,通过试验结果验证了所提出方法的可靠性。以位于福建省某简支梁桥2号墩的桩基作为现场例证,介绍了加固设计的过程。Aiming at the problem that bridge piers are damaged by water erosion,BFRP formwork reinforced bridge piers are a new type of undrained reinforced bridge piers,but there is no analysis method for the seismic performance of bridge piers strengthened by BFRP formwork reinforcement method.Therefore,based on experiments,the displacement and ductility coefficient and material performance parameters of BFRP formwork reinforced bridge piers was established,which include the ultimate compressive strain of BFRP-confined concrete,BFRP hoop ratio,BFRP effective ultimate tensile strength and BFRP effective limit based on the mechanical calculation model between tensile strain and other factors,a design method for seismic ductility reinforcement of BFRP formwork based on the target ductility coefficient improvement index is proposed,and the reliability of the proposed method is verified by the test results.A pile foundation of the No.2 pier of a simply supported girder bridge in Fujian Province is selected as a field example,and the reinforcement design process is introduced.

关 键 词：BFRP模壳 延性设计方法 力学计算模型 现场试验 受力性能 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]