论文部分内容阅读
针对矮塔斜拉桥的特点,提出了基于拉索和预应力钢筋费用最小的索力优化方法。该方法的思路是以设计强度减去活载及其他荷载效应的应力区间,作为主梁上下缘恒载应力可行区域,引入索力和预应力的影响矩阵,利用调值原理,以拉索和预应力筋的综合费用最小为目标,来解决拉索和预应力筋的优化配置问题。用大型有限元软件ANSYS APDL语言实现了这一功能并进行了实桥验算。研究表明:采用该方法确定的索力和预应力,与原设计相比,其费用约为原设计费用的47.9%。
Aiming at the characteristics of the short cable-stayed bridge, the cable force optimization method based on the lowest cost of cable and prestressing steel is proposed. The idea of this method is to take the stress intensity of the design strength minus the live load and other load effects as the feasible region of the constant load stress at the upper and lower edges of the main beam, and to introduce the influence matrix of the cable force and the prestress force. The minimum total cost of prestressed tendons as the goal, to solve the optimization of cable and prestressed tendons configuration. This function was realized with ANSYS APDL language, a large finite element software, and the real bridge was checked. The research shows that the cable force and prestress determined by this method are 47.9% of the original design cost compared with the original design.