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ID:9218590
大小:1.57 MB
页数:6页
时间:2018-04-23
《地面堆载对既有桥梁结构的影响分析》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、桥梁建设2014年第44卷第5期(总第228期)BridgeConstruction,Vo1.44,No.5,2014(TotallyNo228)39.文章编号:1003—4722(2014)05—0039—06地面堆载对既有桥梁结构的影响分析黄清(1.中铁大桥局集团桥科院有限公司,湖北武汉430034;2.桥梁结构安全与健康湖北省重点实验室,湖北武汉43OO34)摘要:针对在桥墩附近违章堆载影响桥梁结构安全的情况,研究地面堆栽对既有桥梁结构的影响。以某匝道桥为例,对梁体变位、墩顶偏位、墩顶支座位移及伸缩缝缝宽等指标进行连续监测,判
2、定险情出现时结构变位是否处于稳定状态;采用美国土工软件FLAC3D模拟被动桩的空间变形和受力状态,验证了地面堆载是产生墩身位移的主要因素,并对地面堆载对桩基和上部结构的影响进行理论分析,通过双速度法对桩基础进行检测。结果表明:在地面堆载作用下,桥墩发生水平位移,进而导致桥梁支座发生滑移,桩基与承台交接处混凝土开裂。建议继续进行结构的变形监测,同时立即对梁体进行复位,对桥梁下部结构进行加固维修。关键词:匝道桥;既有桥;地面堆载;结构验算;受力分析;监测;桩基检测;有限差分法中图分类号:U445.71文献标志码:AAnalysisofI
3、nfluencesofGroundStackedLoadonExistingBridgeStructureHUANGQing'(1.BridgeScienceResearchInstituteLtd.,ChinaRailwayMajorBridgeEngineeringGroup,Wuhan430034,China;2.KeyLaboratoryofBridgeStructureSafetyandHealthofHubeiProvince,Wuhan430034,China)Abstract:Inregardofthesituati
4、onofthebridgestructuresafetyimperiledbytheloadstackednearbythebridgepiersinviolationoftheregulations,theinfluencesofthegroundstackedloadontheexistingbridgestructurewerestudied.Arampbridgewastakenasanexam—pleandseveralindicesincludingthedisplacementofthegirder,piertopsa
5、ndbearingsandthegapchangingoftheexpansionjointofthebridgewerecontinuouslymonitored.Thedisplacementofthestructurewasjudgedtobestableornotatthetimethedangeroussituationoccurred.TheA—mericangeotechnicalsoftwareFLAC3Dwasusedtosimulatethespatialdeformationandforceconditions
6、ofthepassivepilesandthegroundstackedloadwasverifiedtobethemajorfactorcau—singthedisplacementofthepiers.Theinfluencesofthestackedloadonthepilefoundationsandsuperstructureofthebridgeweretheoreticallyanalyzedandthepilefoundationsweretestedbythetwo—velocitymethod.Theresult
7、softhestudyshowthatundertheactionofthegroundstackedload,thepierswillhorizontallydisplaceandwillfurthercausethebearingsatthepiertopstodisplaceandtheconcreteatthejunctionofthepilesandpilecaptocrack.Itisthereforeproposedthatthedisplacementoftherampbridgestructureshouldbec
8、ontinuouslymonitoredandatthesametime,thegirdershouldberestoredtoitsdesignedpositionrightawayandthesubstructureshouldb
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