温度作用下混凝土拼接桥梁拼接缝界面剪应力研究  

Study on interfacial shear stress at splicing joint of concrete spliced bridge under temperature effect

作　　者：施鑫磊 高德宝 李子奇[1,3] 杨勇 王力[1] 徐耀 SHI Xinlei;GAO Debao;LI Ziqi;YANG Yong;WANG Li;XU Yao(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou Gansu 730070,China;China Railway 23rd Bureau Group No.1 Engineering Co.,Ltd.,Rizhao Shandong 276800,China;Key Laboratory of Road & Bridge and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou Gansu 730070,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]中铁二十三局集团第一工程有限公司,山东日照276800 [3]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070

出　　处：《中国安全生产科学技术》2021年第11期158-164,共7页Journal of Safety Science and Technology

基　　金：甘肃省自然科学基金项目(20JR10RA237);长江学者和创新团队发展计划滚动支持项目(IRT15R29)。

摘　　要：为探究拼宽混凝土桥梁在温度效应下连接缝位置产生的界面剪应力问题,考虑施工过程中现浇拼接缝混凝土各项参数的变化,以某高速公路拼接桥梁为研究对象,基于初等梁理论提出1种考虑纵向温度应力的拼宽桥梁界面剪应力力学模型。结果表明:拼接缝混凝土弹性模量的改变对拼接缝界面剪应力的数值和分布形态影响较小;新梁和旧梁的线膨胀系数差异越大拼接缝界面剪应力越大;研究得到不同拼宽宽度下拼宽桥界面局部剪切柔度修订值的变化规律,并拟合变化公式。In order to investigate the problem of interfacial shear stress occurred at the joint position of the widened splicing concrete bridge under the temperature effect,considering the change in the parameters of the cast-in-place splicing joint concrete during the construction process,a mechanical model for the interfacial shear stress of widened bridge considering the longitudinal temperature stress was proposed based on the primary beam theory by taking a spliced bridge of highway as the research object.The results showed that the change in the modulus of elasticity of splicing joint concrete had little effect on the value and distribution pattern of interfacial shear stress at the splicing joint.The greater the difference in the linear expansion coefficient between the new and old beams,the greater the interfacial shear stress at the splicing joint.The variation law of the revised value of local shear flexibility at the interface of the widened splicing bridge under different widths of widened splicing was obtained and the variation equation was fitted.

关 键 词：拼接桥梁 现浇拼接缝 温度效应 线膨胀系数 弹性模量 剪切柔度 

分 类 号：X947[环境科学与工程—安全科学]