不对称连续刚构的不对称系数
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摘要
为深入认识不对称连续刚构的不对称性所引起的结构力学特性,引入不对称连续刚构不对称系数的概念,确定该系数的合理范围以保证结构的合理性。将已建成贵州思南县岩头河大桥结构的大T构对称形成对称连续刚构,从该对称刚构中一个T构的主梁根部依次对称去掉悬浇节段,形成20个不同的不对称系数模型,(含对称结构)。对模型进行适当假定与简化,采用大型有限元软件Midas/Civil,计算得出跨径不对称下连续刚构在自重、活载、系统升温、基础沉降及各工况组合下的支点反力,并得出结构在各工况及各应力组合下的应力。分别对比分析了支点反力和应力在不对称系数变化下的变化规律,确定出不对称连续刚构的不对称系数合理取值范围为0.4≤η≤1.0,对不对称连续刚构在实际工程中的应用具有一定指导意义。
For in-depth understanding of mechanical properties of asymmetric continuous rigid-frame structure caused by the asymmetry,we introduced the concept of asymmetry coefficient,and determined the reasonable range of the coefficient to ensure the rationality of the structure.We expanded the existing symmetric T-frame of Sinan Yantou river bridge into the symmetric continuous rigid frame,symmetrically removed cantilever segments one by one from the main beam root of a T-frame of the symmetric rigid frame to form 20 models with different asymmetry coefficients(containing symmetrical structures).After appropriate assuming and simplifying the models,by using large-scale finite element software Midas/Civil,we calculated the support reactions of continuous rigid frame with asymmetric spans under dead weight,live load,system heating,foundation settlement and combination of all conditions,obtained the stresses under all conditions and combined stress,and comparatively analyzed the variation of the support reaction and the stress with different asymmetry coefficients respectively.The reasonable numerical value range of asymmetry coefficient has been determined as 0.4≤η≤1.0,which is of certain guiding significance in the actual project of asymmetric continuous rigid-frame structure.
For in-depth understanding of mechanical properties of asymmetric continuous rigid-frame structure caused by the asymmetry,we introduced the concept of asymmetry coefficient,and determined the reasonable range of the coefficient to ensure the rationality of the structure.We expanded the existing symmetric T-frame of Sinan Yantou river bridge into the symmetric continuous rigid frame,symmetrically removed cantilever segments one by one from the main beam root of a T-frame of the symmetric rigid frame to form 20 models with different asymmetry coefficients(containing symmetrical structures).After appropriate assuming and simplifying the models,by using large-scale finite element software Midas/Civil,we calculated the support reactions of continuous rigid frame with asymmetric spans under dead weight,live load,system heating,foundation settlement and combination of all conditions,obtained the stresses under all conditions and combined stress,and comparatively analyzed the variation of the support reaction and the stress with different asymmetry coefficients respectively.The reasonable numerical value range of asymmetry coefficient has been determined as 0.4≤η≤1.0,which is of certain guiding significance in the actual project of asymmetric continuous rigid-frame structure.
引文
[1]雷俊卿.大跨度桥梁结构理论与应用[M].北京:北京交通大学出版社,2007.LEI Junqing.Theory and Application of Long Span BridgeStructure[M].Beijing:Beijing Jiaotong UniversityPress,2007.
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[8]李晓娇.不对称连续刚构受力与变形研究[D].大连:大连理工大学,2010.LI Xiaojiao.Study on Force and Deformation ofAsymmetric Continuous Rigid-frame Bridge[D].Dalian:Dalian University of Technology,2010.
[9]郭忆.不对称边跨连续梁桥特性研究[D].南京:东南大学,2003.GUO Yi.Study on Characteristics of Asymmetric Side-spanContinuous Beam Bridge[D].Nanjing:SoutheastUniversity,2003.
[10]黄海东,向中富.基于预应力损失识别的连续刚构桥内力计算方法[J].公路交通科技,2008,25(6):71-76.HUANG Haidong,XIANG Zhongfu.Calculation Method ofInternal Force of Continuous Rigid Frame Bridge Based onPrestress Losses Identification[J].Journal of Highwayand Transportation Research and Development,2008,25(6):71-76.
[11]张罗丽.高墩大跨不对称连续刚构桥受力特点分析[J].山西建筑,2008,34(36),314-315.ZHANG Luoli.The Mechanic Properties Analysis of HighPier Large Cover Asymmetric Continuous Steel Bridge[J].Shanxi Architecture,2008,34(36),314-315.
[12]罗明,杨永清.高墩大跨度连续刚构桥仿真模型及预拱度设置[J].四川建筑,2009,29(3):121-124.LUO Ming,YANG Yongqing.Simulation Model and Pre-camber Setting for High-rise Pier and Long-spanContinuous Rigid Frame Bridge[J].SichuanArchitecture,2009,29(3):121-124.
[2]楼庄鸿.国内外大跨径桥梁的现状和发展趋势[J].中南公路工程,1994,3(1):62-66.LOU Zhuanghong.Domestic and Foreign Long Span BridgeStatus and Development Trends[J].Central SouthHighway Engineering,1994,3(1):62-66.
[3]周军生,楼庄鸿.大跨径预应力混凝土连续刚构桥的现状和发展趋势[J].中国公路学报,2000,13(1):34-40.ZHOU Junsheng,LOU Zhuanghong.The Status-quo andDeveloping Trends of Large-span Prestressed ConcreteBridges with Continuous Rigid Frame Structure[J].ChinaJournal of Highway and Transport,2000,13(1):34-40.
[4]庄卫林.泸州长江二桥主桥结构技术特点[J].桥梁建设,2001(5):30-32.ZHUANG Weilin.Technological Features of Structure inthe Main Bridge of the Second Luzhou Changjiang RiverBridge[J].Bridge Construction,2001(5):30-32.
[5]马保林.高墩大跨连续刚构桥[M].北京:人民交通出版社,2000.MA Baolin.High-rise Pier and Long-span ContinuousRigid Frame Bridge[M].Beijing:China CommunicationsPress,2000.
[6]徐占军,盛兴旺,刘志军.贵阳小关大桥主桥设计要点[J].公路,2003(8):90-94.XU Zhanjun,SHENG Xingwang,LIU Zhijun.DesignSummary of Main Girder of Xiaoguang Long Highway Bridgein Guiyang City[J].Highway,2003(8):90-94.
[7]周伟.不对称跨径连续刚构静力仿真计算及地震反应分析[D].长沙:长沙理工大学,2007.ZHOU Wei.The Artificial Calculation and SeismicResponse Analysis of Asymmetric Continuous Rigid-frameBridge[D].Changsha:Changsha University of Science&Technology,2007.
[8]李晓娇.不对称连续刚构受力与变形研究[D].大连:大连理工大学,2010.LI Xiaojiao.Study on Force and Deformation ofAsymmetric Continuous Rigid-frame Bridge[D].Dalian:Dalian University of Technology,2010.
[9]郭忆.不对称边跨连续梁桥特性研究[D].南京:东南大学,2003.GUO Yi.Study on Characteristics of Asymmetric Side-spanContinuous Beam Bridge[D].Nanjing:SoutheastUniversity,2003.
[10]黄海东,向中富.基于预应力损失识别的连续刚构桥内力计算方法[J].公路交通科技,2008,25(6):71-76.HUANG Haidong,XIANG Zhongfu.Calculation Method ofInternal Force of Continuous Rigid Frame Bridge Based onPrestress Losses Identification[J].Journal of Highwayand Transportation Research and Development,2008,25(6):71-76.
[11]张罗丽.高墩大跨不对称连续刚构桥受力特点分析[J].山西建筑,2008,34(36),314-315.ZHANG Luoli.The Mechanic Properties Analysis of HighPier Large Cover Asymmetric Continuous Steel Bridge[J].Shanxi Architecture,2008,34(36),314-315.
[12]罗明,杨永清.高墩大跨度连续刚构桥仿真模型及预拱度设置[J].四川建筑,2009,29(3):121-124.LUO Ming,YANG Yongqing.Simulation Model and Pre-camber Setting for High-rise Pier and Long-spanContinuous Rigid Frame Bridge[J].SichuanArchitecture,2009,29(3):121-124.
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