基于ANSYS的钢-混凝土叠合梁斜拉桥施工段索力控制

摘要

In order to realize the precise control of cable force in the construction process and provide the reference for the adjustment of cable force under the two-stage dead load,the three-dimensional space finite element model of the cable-stayed bridge was established based on the ANSYS. In the calculation and analysis,the influence of each cable force was considered. Based on the principle of minimum internal strain energy,the cyclic iteration temperature load method was used to simulate the prestressing force of cable-stayed cable. Based on the design scheme of a main span,which was a 400 m of steel-concrete composite girder cable-stayed bridge,the feasibility of applying the cable force under the largest single cantilever construction process was analyzed by using the method. The results show that when the cyclic iteration is 37 times,the force error is less than 5%. The vertical and longitudinal maximum displacement of the bridge is 0. 016 m and 0. 027 m respectively. The results can meet the requirements of the limit of alignm ent.%为了在施工过程中对设计索力进行精确控制,进而为二期恒载作用下的索力调节提供依据,利用ANSYS建立了斜拉桥三维空间有限元模型.计算分析时考虑每条斜拉索索力之间的相互影响,基于内应变能最小的原则,采用循环迭代的温度荷载法模拟施加斜拉索预应力.以一主跨为400 m的钢-混凝土叠合梁斜拉桥设计方案为依托,分析在最大单悬臂施工工段利用该方法施加索力的可行性.结果表明,当循环迭代37次后,索力误差已经控制在5%以内,在此基础上计算桥梁的竖向以及纵向最大位移分别为0.016,0.027 m,均能满足线形限度的要求.