【作者】 任庆新； 刘艳华； 李顺群；

【Author】 REN Qing-xin~1 LIU Yan-hua~2 LI Shun-qun~3 1.School of Civil Engineering,Shenyang Jianzhu University,Shenyang,110168,China; 2.College of Water Resource,Shenyang Agricultural University,Shenyang 110161,China; 3.Department of Civil Engineering,Tianjin Institute of Urban Construction,Tianjin 300384,China

【机构】 沈阳建筑大学土木工程学院； 沈阳农业大学水利学院； 天津城市建设学院土木建筑系；

【摘要】 针对某钢管混凝土拱桥东拱肋拱顶合拢高度比设计标高(35.017m)低0.30m,西拱肋拱顶合拢高度比设计标高低0.44m 的问题,采用 ANSYS 软件对其建立空间有限元模型,并进行了恒载作用下内力对比分析.由计算分析可得到如下结论:(1)此桥拱轴线下降对支反力、各控制截面挠度、轴力及应力影响较小;(2)该桥拱轴线下降对各控制点弯矩影响较大,尤其是拱顶处,但实测拱轴线弯矩均小于设计拱轴线弯矩.通过对该拱桥的拱轴线变位分析,明确了拱轴线下降对结构的影响,认为此桥是安全的.计算结果对该拱桥的检测、评估具有一定参考价值.更多还原

【Abstract】 Aimed at the problem of one concrete-filled steel tubular(CFST)arch bridge which the jointing heights of east and west arch rib is 0.30 and 0.44 meters lower than the design elevation,respectively,the software ANSYS is adopted to establish the finite element model of the structure and used to analyze the struc- tural internal force under dead load.Based on the contrastive analysis of the bridge,some major conclusions are summarized as follows:(1)There has a little influence on support reaction and deflection,axial force, stress of every reference section owing to the drop of arch axis;(2)The drop of arch axis has rather large effect on the bending moment of each reference section,especially the bending moment of the arch crown,but the actual moment is smaller than the design moment.By analyzing the deflection of arch axis of the bridge, the influences of arch axis dropping on the structure are found,and the bridge is considered to be safe.The results obtained are available to the detection and evaluation of the structure in practice.更多还原