矮塔斜拉桥索塔锚固区应力分布规律及计算模型研究  

Research on the Stress Distribution Law and Calculation Model of the Anchoring Zone in the Cable Tower of Short Pylon Cable-stayed Bridge

作　　者：张涛 李伟俊 朱东 邓韬 李永明 ZHANG Tao;LI Weijun;ZHU Dong;DENG Tao;LI Yongming(China Railway No.2 Bureau No.4 Engineering Co.,Ltd.,Chengdu Sichuan 610300,China)

机构地区：[1]中国中铁二局集团第四工程有限公司,四川成都610300

出　　处：《甘肃科技纵横》2024年第6期75-80,共6页Gansu Science and Technology Information

摘　　要：文章依据某矮塔斜拉桥,通过现场试验探究索塔锚固区应力分布规律,明确索塔锚固区混凝土在施工过程中的应力变化特征。文章提出底部设置弹性支撑的局部有限实体计算分析模型,并通过实测值和理论值的对比分析验证该计算分析模型的可行性。研究结果表明:施工过程中,索塔锚固区端部位置出现了拉应力,最大为1.2 MPa,施工时应考虑在锚固区端部增加横向钢筋;索塔锚固区混凝土横向应力呈现出端部小中间位置大的规律;索塔锚固区实测应力值和理论值基本吻合,验证了该计算分析模型用于计算索塔锚固区应力分析的可行性,为索塔锚固区的受力分析提供了技术支撑。Based on a cable-stayed bridge with a low pylon,the stress distribution law in the anchoring area of pylon is studied through field tests,and the stress variation characteristics of concrete in the anchoring area of pylon are determined.A local finite entity model with elastic support at the bottom is proposed,and the feasibility of the model is verified by comparing the measured and theoretical values.The results show that tensile stress occurs at the end of the anchoring area of the cable tower during construction,with the maximum value of 1.2 MPa,and the transverse reinforcement should be added to the end of the anchoring area during construction.The transverse stress of the concrete in the anchoring area of the cable tower is small at the end and large in the middle.The measured stress in the anchoring area of the cable tower is basically consistent with the theoretical value,which verifies the feasibility of the calculation and analysis model for the stress analysis in the anchoring area of the cable tower,and provides technical support for the stress analysis in the anchoring area of the cable tower.

关 键 词：矮塔斜拉桥 索塔锚固区 计算分析模型 应力分布 试验 

分 类 号：U24[交通运输工程—道路与铁道工程]