基于荷载试验的钢混叠合梁技术评定研究  

Research on technical evaluation of steel composite beams based on load test

作　　者：鞠森森 钱若霖 黄春晖[1] 赵春晨 JU Sensen;QIAN Ruolin;HUANG Chunhui;ZHAO Chunchen(Civil Engineering College,Shannxi Polytechnic Institute,Xianyang 712000,Shaanxi China)

机构地区：[1]陕西工业职业技术学院土木工程学院,陕西咸阳712000

出　　处：《粘接》2022年第6期102-107,共6页Adhesion

基　　金：陕西省教育厅一般专项科学研究计划项目(项目编号:20JK0501);2021年度陕西省职业技术教育学会专项课题项目(项目编号:2021SZXZX018)。

摘　　要：对于现役桥梁的管养小修、对于旧桥的评定加固已成为公路桥梁、市政桥梁建设单位一项举足轻重的工作,本文采用成桥荷载试验研究的评定方法,针对某钢混叠合梁桥梁,通过静载试验研究各主要截面的应力状况、挠度变形,通过环境激励和跑车试验研究桥梁的自振特性和冲击系数。研究表明:该桥的应力和挠度校验系数均小于1.0,表明结构工作状态处于弹性阶段,强度符合设计要求;桥梁基频、阻尼比、冲击系数等动力特性结果均满足规范要求,表明桥梁整体性较强,刚度符合设计要求。基于静动载试验结果,提出了一种置信度优化校验系数区间的方法,有效避免了因数据随机性和离散性过大引起的试验结果精度不足的问题,精确了校验系数的区间范围,给同类桥梁静载试验分析提供一定的借鉴意义。The maintenance and small repair of existing bridges and the assessment and reinforcement of old bridges have become a pivotal task for highway bridges and municipal bridge construction units.This paper adopts the evaluation method of bridge load test research,for a steel-concrete composite beam bridge,the stress conditions and deflection deformation of each main section are studied through static load tests,and the natural vibration characteristics and impact coefficients of the bridge are studied through environmental excitation and sports car tests.Research shows that the bridge’s stress and deflection calibration coefficients are both less than 1.0,indicating that the structural working state is in the elastic stage and the strength meets the design requirements;the fundamental frequency,damping ratio,impact coefficient and other dynamic characteristics of the bridge meet the requirements of the specification,indicating that the rigidity meets design requirements.Based on the static and dynamic load test results,a method for confidence optimization of the calibration coefficient interval is proposed,which effectively avoids the problem of insufficient accuracy of the test results caused by the excessive randomness and dispersion of the data,and precise the interval range of the calibration coefficient,providing a certain reference meaning for the static load test analysis of similar bridges.

关 键 词：钢混叠合梁 荷载试验 置信度 区间估计 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]