桩基梁式多侧墙预应力渡槽体系可靠度研究
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摘要
对桩基梁式多侧墙预应力大型渡槽工程,以"槽身构件+槽身+支承槽墩+桩基"为研究对象,建立了体系可靠度计算模型,以南水北调中线洺河渡槽为例,计算了不同槽内水深、不同季节输水、不同抗力折减度及不同抗力变异度时,结构体系可靠指标及主要失效模式可靠指标。结果表明:随水深增大,体系可靠度及体系中槽身与桩基的可靠度降减十分明显,遇偶然因素作用引起抗力折减时也出现相似情况;而结构老化引起的体系可靠度降减较为平缓;不同季节输水时体系运行可靠度相差不大;当不考虑桩端承载力时,桩周抗滑稳定可靠度极低。
For the project of pile beam multi-lateral wall prestressed large aqueduct,the paper studied aqueduct components combined with aqueduct,piers support and pile foundation,established system reliability calculation model,with the example of South-to-North Water Diversion Project,calculated the reliability index of the structure system and main failure modes at the conditions of different water depths,seasons,resistance attenuation ratio and resistance mutation degrees.The results show that,with the water depth increases,reliabilities of system and aqueduct body and pile in system cut down very significantly,similar situation arise when encountered the role of causal factors caused resistance reduction;the reliability of the system due to the aging drop minus relatively gentle;system reliability differs not greatly when delivering water in different seasons;without consideration of the end-bearing capacity of pile,anti-sliding stability reliability around the piles is extremely low.
For the project of pile beam multi-lateral wall prestressed large aqueduct,the paper studied aqueduct components combined with aqueduct,piers support and pile foundation,established system reliability calculation model,with the example of South-to-North Water Diversion Project,calculated the reliability index of the structure system and main failure modes at the conditions of different water depths,seasons,resistance attenuation ratio and resistance mutation degrees.The results show that,with the water depth increases,reliabilities of system and aqueduct body and pile in system cut down very significantly,similar situation arise when encountered the role of causal factors caused resistance reduction;the reliability of the system due to the aging drop minus relatively gentle;system reliability differs not greatly when delivering water in different seasons;without consideration of the end-bearing capacity of pile,anti-sliding stability reliability around the piles is extremely low.
引文
[1]李宗坤,胡良明.穿黄渡槽槽墩的三维有限元分析[J].人民黄河,2001,23(7):38-39.
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[5]李国强,黄宏伟,吴迅,等.工程结构荷载与可靠度设计原理[M].北京:中国建筑工业出版社,2005.
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[2]陈淮,祁冰,杜晓伟.大型双槽渡槽结构振动特性分析[J].世界地震工程,2001(1):93-97.
[3]李清富,高健磊,乐金朝,等.工程结构可靠性原理[M].郑州:黄河水利出版社,2002.
[4]中华人民共和国水利部.GB50199—1994水利水电工程结构可靠度设计统一标准[S].北京:中国计划出版社,1894.
[5]李国强,黄宏伟,吴迅,等.工程结构荷载与可靠度设计原理[M].北京:中国建筑工业出版社,2005.
[6]中华人民共和国水利部.SL/T191—96水工混凝土结构设计规范[S].北京:中国水利水电出版社,1999.
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