混凝土自锚式悬索桥极限承载力影响因素
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摘要
为了研究各种因素对混凝土自锚式悬索桥极限承载力的影响,采用弹塑性有限元方法,对一座跨径160m混凝土自锚式悬索桥的极限承载力进行了全面分析,研究了不同加载方式、混凝土收缩徐变、主梁和索塔配筋率、吊索安全系数、主缆弹性模量以及锚固端约束条件对桥梁极限承载力的影响.研究结果表明:加载方式、吊索的安全系数和锚固端约束条件对该桥极限承载力影响较大,而混凝土收缩和徐变、主梁和索塔的配筋率、主缆的弹性模量对该桥的弹塑性极限承载力影响较小,但对结构刚度影响较明显.
In order to study the effects of several influencing factors on ultimate load carrying capacity of self-anchored concrete suspension bridge,the ultimate load carrying capacity of a self-anchored concrete suspension bridge with span of 160 m was analyzed using the elasto-plastic finite element method. The influencing factors include different loading methods,shrinkage and creep of concrete,reinforcement ratio of main girder and tower,safety coefficient of hanger rod,elastic modulus of main cable and restraint of bearing. The results show that the loading method,safety coefficient of hanger rod and restraint of bearing have great effects on the ultimate load carrying capacity,the effects of shrinkage and creep of concrete,reinforcement ratio of main girder and tower,and elastic modulus of main cable are little,but their effects on structural rigidity are much great.
In order to study the effects of several influencing factors on ultimate load carrying capacity of self-anchored concrete suspension bridge,the ultimate load carrying capacity of a self-anchored concrete suspension bridge with span of 160 m was analyzed using the elasto-plastic finite element method. The influencing factors include different loading methods,shrinkage and creep of concrete,reinforcement ratio of main girder and tower,safety coefficient of hanger rod,elastic modulus of main cable and restraint of bearing. The results show that the loading method,safety coefficient of hanger rod and restraint of bearing have great effects on the ultimate load carrying capacity,the effects of shrinkage and creep of concrete,reinforcement ratio of main girder and tower,and elastic modulus of main cable are little,but their effects on structural rigidity are much great.
引文
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[2]石磊.混凝土自锚式悬索桥设计理论研究[D].大连:大连理工大学,2003.
[3]刘春城.混凝土自锚式悬索桥三维地震反应研究[D].大连:大连理工大学,2004.
[4]XI Y,KUANG J S.Ultimate load capacity of cable-stayed bridge[J].Journal of Bridge Engineering,1999,4(1):14-22.
[5]REN W X.Ultimate behavior long-span cable-stayed bridges[J].Journal of Bridge Engineering,1999,4(1):30-37.
[6]潘家英,张国正,程庆国.大跨度桥梁极限承载力的几何与材料非线性耦合分析[J].土木工程学报,2000,33(1):5-8.
[7]CHANDRA R.Elastic-plastic analysis of steel space structures[J].Journal of Structural Engineering,ASCE,1990,116(4):939-955.
[8]FU K C and LU F.Nonlinear finite-element analysis for highway bridge superstructures[J].Journal of Bridge Engineering,2003,8(3):173-179.
[9]李国豪.桥梁结构振动与稳定[M].北京:中国铁道出版社,1992.
[10]邱文亮.自锚式悬索桥非线性分析与试验研究[D].大连:大连理工大学,2004.
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