海南西环线既有桥梁动载试验研究
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摘要
就提速改造之前的海南西环线8座桥梁的9孔梁进行了动载试验。采用列车通过桥梁时,梁体跨中动挠度、梁体跨中竖向振动与梁体跨中和桥墩墩顶横向振动、梁体跨中横向振动加速度、支座竖向动位移和横向动位移测试,确定桥梁结构的动力系数、振动特征、裂缝状态,用以评定结构在动载作用下的工作状态确定桥梁的可靠性。通过相关关系分析,揭示桥梁结构动力学特性差异的原因。
Dynamic load tests were carried out to 9-span beams of 8 bridges of west circle line in Hainan before the acceleration transformation.When train was passing through the bridges,the dynamic deflection,vertical vibration and transverse vibration acceleration of beam span centre,transverse vibration of beam span centre and pier's top,vertical dynamic displacement and transverse dynamic displacement were obtained.Dynamic modulus,vibration characteristics and crack condition of the bridges designed to validate working condition of structure under dynamic load so as to ascertain reliability of bridges were determined.In addition,reasons of being different in dynamic characteristics of bridges were revealed through analysis of correlative relation.
Dynamic load tests were carried out to 9-span beams of 8 bridges of west circle line in Hainan before the acceleration transformation.When train was passing through the bridges,the dynamic deflection,vertical vibration and transverse vibration acceleration of beam span centre,transverse vibration of beam span centre and pier's top,vertical dynamic displacement and transverse dynamic displacement were obtained.Dynamic modulus,vibration characteristics and crack condition of the bridges designed to validate working condition of structure under dynamic load so as to ascertain reliability of bridges were determined.In addition,reasons of being different in dynamic characteristics of bridges were revealed through analysis of correlative relation.
引文
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[2]XIA He.Experimental analysis of high speed railwaybridge under Thalys trains[J].Journal of Sound and Vi-bration,2003,268:103-113.
[3]YANG Y B,Yau J D.Vehicle-bridge interaction ele-ment for dynamic analysis[J].Structural Engineering,ASCE,1997,123(11):1512-1518.
[4]Xia H.Dynamic analysis of train-bridge system and itsapplication in steel girder reinforcement[J].Computersand Structures,2001(79):1851-1860.
[5]张启伟.大型桥梁健康监测概念与监测系统设计[J].同济大学学报,2001,29(1):66-69.ZHANG Qi-wei.Conception of long-span bridge healthmonitoring and monitoring system design[J].Journal ofTongji University,2001,29(1):66-69.
[6]朱东生,虞庐松.不规则桥梁地震动输入主方向的研究[J].兰州铁道学院院报,2000,19(6):37-40.ZHU Dong-sheng,YU Lu-song.The study of earthquakeinput principal direction for irregular bridges[J].Journalof Lanzhou Railway University,2000,19(6):37-40.
[7]袁向荣,陈恩利.由响应识别桥上移动载[J].工程力学,1997,14(4):89-97.YUAN Xiang-yong,CHEN En-li.In response to the mo-bile idenfication bridge[J].Engineering Mechanics,1997,14(4):89-97.
[8]罗蔚文.提速对既有桥梁的疲劳影响沪杭线41号桥测试资料分析[J].铁道学报,1998,20(6):122-125.LUO Wei-wen.Increased speed influence on fatigue of theexisting bridge-the Shanghai-Hangzhou line 41 bridgetest data analysis[J].Journal of the China Railway Socie-ty,1998,20(6):122-125.
[9]广铁科研所,粤海城际铁路指挥部,等,海南西环线160km/h提速工程线桥改造试验研究报告[R].2007.The Guangzhou Railway Scientific Research,Guangdonginter-City Railway Headquarters.Report of researchesand tests on bridge of Hainan west ring road speeded to160 km/h[R].2007.
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