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页数:5页
时间:2019-05-11
《北江大桥引桥整体顶升施工仿真分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、桥梁建设2015年第45卷第3期(总第232期)BridgeConstruction,Vo1.45,No.3,2015(TotallyNo.232)99文章编号:1003—4722(2015)03—0099—05北江大桥引桥整体顶升施工仿真分析陈舟,颜全胜,何振族(1.三峡大学土木与建筑学院,湖北宜昌443002;2.华南理工大学土木与交通学院,广东广州510640)摘要:北江大桥为多跨连续粱桥,由于佛开高速扩建,该桥引桥采用整体同步顶升施工,需顶升0.15O~1.491m。为分析该桥在顶升施工中的梁体受力
2、,为施工提供指导,采用ANSYS软件建立该桥15~22号墩连续梁模型,对同步顶升力、落梁调整到位后梁体的受力进行计算分析,并研究纵、横向误差对粱底应力和支座反力的影响。结果表明:在同步顶升过程中,理论顶升力与实测值接近;落梁后梁体应力变化的理论值与实测值接近,梁体仍处于受压状态;1cm的纵向顶升误差不会使梁体出现拉应力,也不会使支座反力出现较大变化;1cm的横向顶升误差使梁体出现拉应力,使支座反力出现较大变化。因此须严格控制顶升误差,建议纵向项升误差不超过10mm,横向不超过5mm。关键词:连续梁桥;整体顶
3、升;桥梁维修;有限元法;顶升误差;应力分析中图分类号:U448.21;U445.6文献标志码:ASimulationAnalysisofIntegralJacking-upConstructionofApproachBridgeofBeijiangRiverBridgeCHENZhou一,YANQuan—sheng,HEZhen—zll。(1.CollegeofCivilEngineeringandArchitecture,ChinaThreeGorgesUniversity.Yichang443002,C
4、hina;2.SchoolofCivilEngineeringandTransportation,SouthChinaUniversityofTechnology,Guangzhou510640,China)Abstract:TheBeijiangRiverBridgeisamulti—spancontinuousgirderbridge.Theapproachbridgeofthebridgeneededtobeconstructedbytheintegralandsynchronousjacking—u
5、Powingt0theexpansionofFoshan—KaipingExpresswayandwastobejackedup0.150~1.491m.Toana—lyzetheforceconditionsofthecontinuousgirderoftheapproachbridgeintheprocessoftheack—ing—upconstructionandtoprovideguidancefortheconstruction,thesoftwareANSYSwasusedtoestablis
6、hthemodelforthegirderofthebridgeatopPiersNo.15~No.22,thesynchron0usjacking—upforcesandforceconditionsofthegirderafterthegirderwaslowereddownandaus—tedwerecalculatedandanalyzedandtheinfluencesofthelongitudinalandtransversejacking—uperrorsonthegirderbottomst
7、ressandbearingreactionforceswerestudied.Theresultsofthestudyshowthatintheintegralandsynchronousjacking—upconstruction,thetheoreticalandmeasuredjacking~upforcesareclose.Thetheoreticalandmeasuredvaluesofthestresschangesofthegirderafterthegirderislowereddowna
8、recloseandthegirderremainsthestateofcom—pression.Thelongitu,dinaljacking—uperroroflcmwillneithercausethegirdertohavetensilestress'norcausethebearingreactionforcestosignificantlychange.Thetransverseacking—uper
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