一种适合中小跨径桥梁结构挠度快速测试方法  

A Rapid Test Method for Deflection of Small and Medium‑Span Bridges

作　　者：张爱品 马林东 常柱刚 范治豪 ZHANG Aipin;MA Lindong;CHANG Zhugang;FAN Zhihao(China Railway Development and Investment Group Co.,Ltd.,Kunming,Yunnan 650200,China;Changsha Planning and Design Institute Co.,Ltd.,Changsha,Hunan 410007,China;School of Civil Engineering,Central South University,Changsha,Hunan 410075,China)

机构地区：[1]中铁开发投资集团有限公司,云南昆明650200 [2]长沙市规划设计院有限责任公司,湖南长沙410007 [3]中南大学土木工程学院,湖南长沙410075

出　　处：《中外公路》2024年第3期175-183,共9页Journal of China & Foreign Highway

基　　金：中铁开投科技研究开发计划项目(编号:2021-B类-05);湖南省自然科学基金资助项目(编号:2021JJ30840)。

摘　　要：桥梁挠度响应是用于桥梁结构状态评估最主要的指标之一,目前关于挠度测量的方法及装置较多,但在经济性、适用范围、测量精准性等方面无法较好同步。该文提出一种适合中小跨径桥梁的跨中挠度快速高精度测量方法,依托位移传感器在直接接触式测量方面的高精度优势,研发辅助测量装置将桥上测点挠度以刚性连接形式传递至位移传感器,从而实现精准、动态测试目的。建立车-桥-吊杆系统耦合计算模型,同步开展模型试验,对比车辆荷载作用下桥上测点与监测点的位移偏差,验证该文方法用于动力响应测试的可行性。模拟计算横向风荷载作用对该装置传递精度的影响,结果表明:对于12 m长传递杆,横向风荷载作用引起的测量偏差小于5%,证明该文提出的测试方法具有较高的精度和实用性。Bridge deflection response is one of the most important indicators used for structural condition assessment of bridges.There are currently many methods and devices for deflection measurement,but they are not satisfying in terms of economy,applicability,and measurement accuracy at the same time.This paper proposed a rapid and highly accurate method for measuring mid-span deflection of small and medium-span bridges.By using the high accuracy of displacement transducers in direct contact measurement,an auxiliary measurement device was developed to transfer the deflection of the measurement points on the bridge to the displacement transducer in the form of a rigid connection,thus achieving accurate and dynamic testing.A coupled vehicle-bridge-derrick system model was developed,and model tests were carried out simultaneously to compare the displacement deviation between the measurement points on the bridge and the monitoring point under vehicle loading and verify the feasibility of the proposed method for dynamic response testing.The effect of transverse wind load on the transfer accuracy of the device was simulated and calculated.The results show that the measurement deviation caused by the transverse wind load is less than 5%for the 12 m-long transfer rod,proving that the proposed test method has high accuracy and practicality.

关 键 词：中小型桥梁 挠度测量 辅助测试装置 传递精度 

分 类 号：U446[建筑科学—桥梁与隧道工程]