基于实际影响线的桥梁快速检测方法
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摘要
针对桥梁静载试验存在费时费力、长时间影响或中断交通的缺点,提出一种基于实际影响线的桥梁快速检测方法。首先对桥梁进行标定试验,从单一车辆过桥的动力响应中提取桥梁实际影响线;引入车辆轮胎-路面接触力分布模型,可重构出静载试验不同加载工况下桥梁相应测点的静力响应,从而实现快速检测。以某六跨连续梁桥为背景,针对其第1跨分别进行单一车辆快速检测与多车辆静载试验,对比主梁跨中挠度和应变响应。结果表明:主梁跨中挠度和应变的快速检测结果与静载试验结果吻合较好,最大偏差为7.6%,基于实际影响线的快速检测方法具有较高精度。
We propose a rapid detection method for bridge structure based on actual influence lines,which overcomes the drawbacks of time-consuming,being labor-intensive,long-term impact or interruption traffic that exist in bridge static load tests.Firstly,an actual influence line is extracted from bridge dynamic responses based on a calibration test with a passing vehicle.Then,a tire-pavement contact force distribution model is introduced to reconstruct bridge static responses under different loading conditions,so that the rapid detection can be realized.Taking a six-span continuous girder bridge as an example,we performed the one-vehicle based rapid detection and the multi-vehicle based static load test at the first span,and compared the mid-span deflection and strain of main girder.The results show that the rapid detection values of mid-span deflection and strain of main girder agree well with those by static load test,and the maximum deviation is 7.6%,indicating that the rapid detection method based on actual influence lines possesses a high precision.
We propose a rapid detection method for bridge structure based on actual influence lines,which overcomes the drawbacks of time-consuming,being labor-intensive,long-term impact or interruption traffic that exist in bridge static load tests.Firstly,an actual influence line is extracted from bridge dynamic responses based on a calibration test with a passing vehicle.Then,a tire-pavement contact force distribution model is introduced to reconstruct bridge static responses under different loading conditions,so that the rapid detection can be realized.Taking a six-span continuous girder bridge as an example,we performed the one-vehicle based rapid detection and the multi-vehicle based static load test at the first span,and compared the mid-span deflection and strain of main girder.The results show that the rapid detection values of mid-span deflection and strain of main girder agree well with those by static load test,and the maximum deviation is 7.6%,indicating that the rapid detection method based on actual influence lines possesses a high precision.
引文
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[8]柳帅蒙.载重轮胎接地压力模型研究(硕士学位论文)[D].西安:长安大学,2015.(LIU Shuai-meng.Study on the Truck Tire Contact Pressure Model(Master Dissertation)[D].Xi′an:Chang′an University,2015.in Chinese)
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[10]宋勇,梁彦龙,马学军,等.汽车轮胎与路面接触应力分布特点及力学模型[J].公路交通科技,2014,31(10):112-118.(SONG Yong,LIANG Yan-long,MA Xue-jun,et al.Distribution Characteristics of Contact Stress Between Vehicle Tire and Road Surface and Mechanical Model[J].Journal of Highway and Transportation Research and Development,2014,31(10):112-118.in Chinese)
[2]许珊珊,李丽,高伟.基于静载试验的桥梁结构性能检测分析与研究[J].黑龙江工程学院学报,2014,28(6):6-8,12.(XU Shan-shan,LI Li,GAO Wei.The Detection A-nalysis and Research of Bridge Structure Performance Based on Static Load Test[J].Journal of Heilongjiang Institute of Technology,2014,28(6):6-8,12.in Chinese)
[3]张茵涛.在役预应力混凝土梁桥静载试验[J].铁道建筑,2018,58(3):28-30,38.(ZHANG Yin-tao.Static Load Test Study on Prestressed Concrete Girder Bridge in Service[J].Railway Engineering,2018,58(3):28-30,38.in Chinese)
[4]向洪,杨春林,龚江烈.静载试验评定桥梁承载能力的问题探讨[J].公路工程,2013,38(6):217-219.(XIANG Hong,YANG Chun-lin,GONG Jiang-lie.Discussion on Static Load Test and Evaluation of Bridge Bearing Capacity Problems[J].Highway Engineering,2013,38(6):217-219.in Chinese)
[5]Wang Ning-bo,He Li-xiang,Ren Wei-xin,et al.Extraction of Influence Line Through a Fitting Method from Bridge Dynamic Response Induced by a Passing Vehicle[J].Engineering Structures,2017,151:648-664.
[6]Obrien E J,Quilligan M J,Karoumi R.Calculating an Influence Line from Direct Measurements[J].Bridge Engineering,2006,159(1):31-34.
[7]王宁波.桥梁动态称重技术适用范围与测试精度研究[J].桥梁建设,2015,45(5):36-41.(WANG Ning-bo.Study of Application Scope and Test Precision of Bridge Weigh-in-Motion Technology[J].Bridge Construction,2015,45(5):36-41.in Chinese)
[8]柳帅蒙.载重轮胎接地压力模型研究(硕士学位论文)[D].西安:长安大学,2015.(LIU Shuai-meng.Study on the Truck Tire Contact Pressure Model(Master Dissertation)[D].Xi′an:Chang′an University,2015.in Chinese)
[9]Ronald B.Introducing Improved Loading Assumptions into Analytical Pavement Models Based on Measured Contact Stresses of Tires[C]//The International Conference on Accelerated Pavement Testing.Reno,1999:1-24.
[10]宋勇,梁彦龙,马学军,等.汽车轮胎与路面接触应力分布特点及力学模型[J].公路交通科技,2014,31(10):112-118.(SONG Yong,LIANG Yan-long,MA Xue-jun,et al.Distribution Characteristics of Contact Stress Between Vehicle Tire and Road Surface and Mechanical Model[J].Journal of Highway and Transportation Research and Development,2014,31(10):112-118.in Chinese)