考虑主缆镀锌层蠕变的索夹螺杆紧固力损失预测  

Research on Preload Loss Prediction of Clamp Bolt Considering Cable Creep of Galvanized Layer

作　　者：周勇军[1] 贾利强[1,2] 杨帆 赵煜 穆丰睿[1] 张馨浩 景薇 丁丽鑫 孟广林 ZHOU Yong-jun;JIA Li-qiang;YANG Fan;ZHAO Yu;MU Feng-rui;ZHANG Xin-hao;JING Wei;DING Li-xin;MENG Guang-lin(Research Center of Highway Large Structure Engineering on Safety,Ministry of Education,Chang'an University,Xi'an 710064,Shaanxi,China;Guangxi Xin'gang Communications Investment Co.Ltd.,Nanning 530000,Guangxi,China;Shaanxi Provincial Transport Planning Design and Research Institute Co.Ltd.,Xi'an 710065,Shaanxi,China;No6.Engineering Corporation Limited of CR20G,Xi'an 712000,Shaanxi,China;Xi'an Anju New Energy Development Co.Ltd.,Xi'an 710075,Shaanxi,China;Shaanxi Transportation City Mineral Recycling Technology Co.Ltd.,Xi'an 713704,Shaanxi,China)

机构地区：[1]长安大学公路大型结构安全教育部工程研究中心,陕西西安710064 [2]广西欣港交通投资有限公司,广西南宁530000 [3]陕西省交通规划设计研究院有限公司,陕西西安710065 [4]中铁二十局第六工程公司工程部,陕西西安712000 [5]西安市安居新能源发展有限公司,陕西西安710075 [6]陕西交通城市矿产循环科技有限公司,陕西西安713704

出　　处：《中国公路学报》2024年第7期157-167,共11页China Journal of Highway and Transport

基　　金：广西科技重点研发计划项目(桂科AB23026125);中央高校基本科研业务费专项资金项目(300102214301,300102214403)。

摘　　要：为研究悬索桥索夹在施工及运营阶段中螺杆紧固力损失规律与预测模型,以广西龙门大桥主缆索夹为研究对象,基于室内试验,采用时间硬化理论对悬索桥主缆轴向蠕变以及考虑主缆镀锌层蠕变的索夹螺杆蠕变参数分别进行非线性回归拟合,并通过建立的索夹局部有限元模型对拟合参数进行验证。研究了螺杆应力随时间的损失规律;建立了全桥有限元模型,对运营阶段各类型和位置的索夹螺杆进行紧固力损失的有限元模拟预测。研究结果表明:对于材料蠕变,有限元计算值比公式值小6%,螺杆张拉后10000 h有限元计算误差在10%以内;在索夹螺杆初次张拉完成后的40 d内应对其进行检测与补张,在施工阶段二次补张完成后的2年3个月内应再次对索夹螺杆紧固力进行检测与补张。研究结论可为悬索桥索夹螺杆紧固力检测与养护提供技术支持。The main cable clamp of the Guangxi Longmen Bridge was considered as a research object to study the preload loss and prediction model of clamp bolts in suspension bridges during the construction and service stages.First,based on the time hardening theory and indoor experiments,the nonlinear regression fitting of the main cable in its axial direction and clamp bolt creep parameters considering the creep of the galvanized layer of the cable were performed,respectively.Second,the fitting parameters were verified using the established local finite element model(FEM)of the cable clamp.The relationship between preload loss in the bolt and time was studied.In addition,a finite element model of the Longmen bridge was established,and the typical preload loss of the cable clamp bolts in the bridge was simulated.The results showed that for material creep,the FEM calculation value was 6%lower than the formula value,and the FEM calculation error at 10000 h was less than 10%after the bolt was tensioned.The cable clamp bolt should be tested and re-tensioned within 40 d after the initial tension is completed,and the cable clamp bolt preload should be tested and the bolt should be re-tensioned again within 2 years and 3 months after the completion of the final re-tension,which can provide technical support for the detection and maintenance of suspension bridge clamp bolts.

关 键 词：桥梁工程 悬索桥 蠕变模型 螺杆紧固力 

分 类 号：U44[建筑科学—桥梁与隧道工程]