强震作用下减隔震桥梁抗震性能试验研究.pdf

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1、桥梁建设２０１６年第４６卷第５期（总第２４０期）BridgeConstruction，Vol．４６，No．５，２０１６（TotallyNo．２４０）５９文章编号：１００３－４７２２（２０１６）０５－００５９－０６强震作用下减隔震桥梁抗震性能试验研究王凯睿，徐秀丽，李雪红，李枝军，刘伟庆（南京工业大学土木工程学院，江苏南京２１０００９）摘要：为了研究连续梁桥的地震反应特性，对一座采用铅芯橡胶支座的三跨连续梁桥结构进行振动台试验。按峰值加速度从小到大的顺序依次输入El‐Centro波、拟合波、人工波３种地震波，研究结构的地

2、震反应，并对比边墩、中墩的地震反应，分析墩柱损伤对支座减隔震性能的影响。结果表明：地震波峰值加速度小于０．３g输入时，结构整体地震反应较小，处于弹性工作状态，地震波峰值加速度０．３g～０．５g输入时，结构整体地震反应逐渐增大，形成塑性铰，地震波峰值加速度０．６g输入后，结构达到承载能力极限状态，发生破坏；连续梁桥中间墩的地震反应略小于边墩；桥墩塑性破坏后的刚度退化会限制支座减隔震作用的发挥，但同时墩柱刚度退化也会有效延长结构自振周期，降低结构的地震反应。关键词：连续梁桥；振动台试验；铅芯橡胶支座；地震波；地震反应；减隔

3、震；墩柱损伤中图分类号：U４４８．２１５；U４４２．５５文献标志码：AExperimentalStudyofSeismicPerformanceofSeismicallyMitigatedandIsolatedBridgesUnderStrongEarthquakeWANGKairui，XUXiuli，LIXuehong，‐LIZhijun，‐LIUWeiqi‐ng‐（CollegeofCivilEngineering，NanjingTechUniversity，Nanjing２１０００９，China）Abstract

4、：Tostudytheseismicresponsecharacteristicsofcontinuousgirderbridges，theshaketabletestsfora３‐spancontinuousgirderbridgestructureusingthelead‐rubberbearingsweremade．３kindsoftheseismicwavesoftheEl‐Centrowave，fittedwaveandartificialwaveweresuc‐cessivelyinputinthetest

5、sintheorderofthehightolowpeakaccelerationandtheseismicrespon‐sesofthestructurewereinvestigated．Theseismicresponsesofthesideandcentralpierswerecomparedandtheinfluencesofdamageofthepiercolumnsontheseismicmitigationandisolationperformanceofthebearingswereanalyzed．T

6、heresultsdemonstratethatwhenthepeakaccelera‐tionoftheseismicwavesthatislessthan０．３gisinput，theglobalseismicresponsesofthestruc‐tureareweakandthestructureisinthestateofelasticity．Whenthepeakaccelerationof０．３g～０．５gisinput，theglobalseismicresponsesofthestructuregra

7、duallyincreaseandtheplastichin‐gescomeintobeingandwhenthepeakaccelerationof０．６gisinput，thestructurereachesthelimitstateofthebearingcapacityandthedamagetakesplace．Theseismicresponsesofthecentralpiersofthecontinuousgirderbridgesareslightlyweakerthanthoseofthesidep

8、iers．Therigiditydete‐riorationofthepiersaftertheplasticdamagerestrictstheroleoftheseismicmitigationandisola‐tionofthebearings，however，therigiditydeteriorationofthepie