栓钉式钢-混凝土组合梁疲劳刚度退化研究  

Study on the Fatigue Stiffness Degradation of Studded Steel-Concrete Composite Beams

作　　者：张吉仁 卜建清 曹文龙[3] 荀敬川 ZHANG Jiren;BU Jianqing;CAO Wenlong;XUN Jingchuan(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of traffic and transportation,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Department of Civil Engineering,Hebei Jiaotong Vocational and Technical College,Shijiazhuang 050043,China;CSCEC Road and Bridge Group Co.,Ltd.,Shijiazhuang 050001,China)

机构地区：[1]石家庄铁道大学土木工程学院,石家庄050043 [2]石家庄铁道大学交通运输学院,石家庄050043 [3]河北交通职业技术学院土木工程系,石家庄050043 [4]中建路桥集团有限公司,石家庄050001

出　　处：《铁道标准设计》2022年第5期77-82,共6页Railway Standard Design

基　　金：河北省重点研发计划项目(19275405D);石家庄铁道大学研究生资助项目(YC2020012);河北省高等学校科学技术研究项目(Z2020203)。

摘　　要：为了研究疲劳荷载作用下栓钉式钢-混凝土组合梁疲劳刚度的退化规律与影响因素,提出了改进的组合梁疲劳变形计算方法,并基于此结合疲劳刚度定义式与刚度退化函数,对组合梁疲劳刚度退化规律进行分析,探究抗剪连接度与荷载幅值对组合梁疲劳刚度的影响规律。结果表明:论文提出的组合梁疲劳变形计算方法与试验结果吻合较好,最大误差在12%以内;组合梁疲劳刚度退化呈“S”形,即在疲劳荷载加载初、末期,疲劳刚度退化量及退化速率较大,加载中期持续时间最长,疲劳刚度退化量及退化速率均较低,呈线性退化;荷载幅值增大及抗剪连接度降低会提高组合梁疲劳刚度退化速率及增大退化量。In order to study the degradation law and influencing factors of the fatigue stiffness of the studded steel-concrete composite beam under fatigue load,an improved calculation method for fatigue deformation of the composite beam is proposed.The fatigue stiffness degradation law of the composite beam is analyzed based on the fatigue stiffness definition formula and stiffness degradation function,and the influence of shear connection and load amplitude on the fatigue stiffness of the composite beam is explored.The results show that the proposed fatigue deformation calculation method of the composite beam is in good agreement with the test results,and the maximum error is within 12%;the fatigue stiffness of the composite beam is degraded in an“S”shape,the amount of fatigue stiffness degradation and the rate at the beginning and end of fatigue loading are both bigger,the duration of the middle loading period is the longest with lower degradation amount and degradation rate,showing linear degradation;the increase of load amplitude and the decrease of shear connection will increase the fatigue stiffness degradation rate and the amount of the composite beam.

关 键 词：桥梁工程 疲劳刚度 理论分析 钢-混凝土组合梁 抗剪连接度 荷载幅值 

分 类 号：U441.4[建筑科学—桥梁与隧道工程] U448.38[交通运输工程—道路与铁道工程]