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自锚式悬索桥荷载试验分析

2024-06-21刘阳李凡张焱

河南科技 2024年8期

刘阳 李凡 张焱

摘 要:【目的】为了准确掌握某自锚式悬索桥结构的运行状况,对该桥进行荷载试验。【方法】通过有限元模拟分析和荷载试验检测相结合的方法,基于静力荷载工况下的应变数据、挠度数据和缆索数据,再结合动载试验下的基频与模态参数,将实测值与理论值进行分析比较。【结果】荷载试验测试结果表明:主桥相对残余应变<20%,挠度校验系数介于0.83~0.99之间,吊索索力和主缆变形校验系数为0.76~0.91,主桥实测前三阶自振频率均大于理论前三阶。【结论】该桥承载能力与刚度满足要求,吊索和主缆变形满足设计要求,总体满足行车要求。

关键词:桥梁检测;荷载试验;自锚式悬索桥;挠度;应变

中图分类号:U446     文献标志码:A     文章编号:1003-5168(2024)08-0060-06

DOI:10.19968/j.cnki.hnkj.1003-5168.2024.08.012

Load Test Analysis of Self-Anchored Suspension Bridge

LIU Yang LI Fan ZHANG Yan

(Zhuhai Traffic Engineering Technology Co., Ltd., Zhuhai 519090, China)

Abstract: [Purposes] To accurately grasp the operating status of a self-anchored suspension bridge, dynamic and static load tests are carried out on the bridge. [Methods] Based on the strain data, deflection data, and cable data under static load, combined with the fundamental frequency and modal parameters under dynamic load test, the measured values are compared with the theoretical values by the finite element simulation and load test method. [Findings] The load test results show that the relative residual strain of the main bridge is less than 20%, the deflection calibration coefficient is between 0.83 and 0.99, the cable force and the leading cable deformation calibration coefficient are between 0.76 and 0.91, and the measured first three natural vibration frequencies of the main bridge are more significant than the theoretical first three natural vibration frequencies. [Conclusions] The bearing capacity and stiffness of the bridge can meet the requirements, and the deformation of the sling and main cable can meet the design requirements. In general, the driving requirements are met.

Keywords: bridgedetection; loadtest; self-anchored suspension bridge; deflection; strain

0 引言

自锚式悬索桥具有造价低、造型优美等优点,近年来数量逐渐增加[1],因此悬索桥安全性的问题研究逐渐提上了日程。桥梁荷载试验是全方位、系统化检查其结构运行状态的主要方式[2],对在役桥梁和新建桥梁进行荷载试验可以切实掌握桥梁的运行状况[3-4],从而保障人民的生命财产安全。

本研究以某自锚式悬索桥项目为依托,对其进行荷载试验分析,将实测值与理论值进行对比,评估该桥梁运行状态,为同类型自锚式悬索桥安全检测提供参考[5-6]。

1 工程概况

某大桥主桥为双塔自锚式悬索桥,桥跨布置为(32+40+150+40+32) m,主桥布置如图1所示,桥面为双向4车道。主桥主跨为150 m,桥面板采用钢-混叠合梁,桥宽29.5 m,梁高3.0 m。全桥共设有两根主缆,横桥向的中心间距为28.5 m,相邻吊索索距为5 m。

自锚式悬索桥150 m主梁采用钢混组合梁,32 m+40 m边跨采用预应力混凝土箱梁。钢主梁梁段间施工采用M30的高强度螺栓连接,钢主梁竖曲线通过调整拼接板螺栓孔距形成。……

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