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时间:2019-05-11
《斜拉桥施工阶段标高控制模糊随机可靠度分析》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2014年第44卷第5期(总第228期)l12BridgeConstruction,Vo1.44,No.5,2014(TotallyNo.228)文章编号:1003—4722(2014)05—0112—06斜拉桥施工阶段标高控制模糊随机可靠度分析余晓琳,杨勇,贾布裕,颜全胜(1.华南理X-大学土木与交通学院,广东广州510640;2.广州市市政I-程设计研究院,广东广州510060)摘要:由于桥梁施.7-阶段标高控制过程中存在随机性和强烈模糊性的问题,为取得更好的标高控制效果,采用随机有限元法求解桥梁结构响应梯度,结合模糊隶属函数向随机密度函数作等价变换,得到标高控制模糊随机
2、可靠度。以九江重建斜拉桥为背景,对随机变量参数进行敏感度分析,计算该桥的标高控制模糊随机可靠度,并分析与此相关的多种影响因素。结果表明,钢主梁容重、斜拉索弹性模量等是敏感度较大的随机变量;考虑标高控制失效模糊随机性,通过隶属函数将失效区域定义在某个区间得到的结果更具实用性;适当提高控制成功界限值,选择最优的标高控帝】失败界限值,可较好地提高施工阶段标高控制成功率。关键词:斜拉桥;施I-阶段;标高控制;模糊随机可靠度;随机变量;变异系数;可靠度分析中图分类号:U448.27;TBl14.3文献标志码:AAnalysisofFuzzyRandomReliabilityofElevatio
3、nControlofCable-StayedBridgeatConstructionStageYUXiao—lin,YANGYong,JIABll—yu,YANQuan—sheng(1.SchoolofCivilEngineeringandTransportation,SouthChinaUniversityofTechnology,Guangzhou510640,China;2.GuangzhouMunicipalEngineeringDesignandResearchInstitute,Guangzhou510060,China)Abstract:Theproblemsofran
4、domnessandstrongfuzzinessexistintheprocessofelevationcontrolofcable—stayedbridgeatconstructionstage.Toachievebettereffectoftheelevationcon—trol。therandomfiniteelementmethodwasusedtosolvethestructuralresponsegradientsofthebridgeandbythemethodofequivalentlytransformingthefuzzymembershipfunctionst
5、otheran—doradensityfunctions.thefuzzyrandomreliabilityoftheelevationcontro1wasobtained.TheJi—ujiangReconstructedCable—StayedBridgewascitedasanexample,thesensitivityanalysisoftherandomvariableparametersofthebridgewasimplemented,thefuzzyrandomreliabilityoftheel—evationcontro1wascalculatedandanumb
6、eroftheinfluentialfactorsrelatedtotherandomrelia~bilitywereanalyzed.Theresultsoftheanalysissuggestthatthevolumeweightofthesteelmaingirderandtheelasticitymodulusofthestaycablesaretherandomvariablesofgreatsensitivity.Theresuhsobtainedfromthemethod。ofdefiningthefailurezoneinacertainspaceintervalby
7、consideringtherandomnessandfuzzinessoftheelevationcontrolfailureandbyusingthemem—bershipfunctionsaremorepractica1.Theproperincreaseoftheboundaryvalueoftheelevationcontro1suceessandthechoiceoftheoptimalboundaryvalueoftheelevationeo
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