摘要
拱塔斜拉桥的拱轴线设计是一项复杂工作,该文提出了拱形主塔拱轴线的逐段设计算法。该算法将拱轴线离散为一系列连续直线段,根据设计指定的主拱内力状态和节段的平衡条件,自拱顶起逐点计算出拱轴线坐标。另外该算法仅要求已知斜拉索竖向索力分量,其余两个索力分量可在逐段计算拱轴线坐标的同时得到。该文以主梁弯曲应变能为目标函数对索力的竖向分量进行了研究。台江大桥主塔拱轴线算例研究表明,逐段拱轴线设计算法具有较高的精度和计算效率。
The design of arch axis is a difficult task for cable-stayed bridge with arch-shaped tower. Assuming a polyline for the arch axis, an incremental algorithm is presented for the geometrical analysis of arch-shaped tower. The nodal coordinates of the arch are computed incrementally according to the targeted distribution of bending moments and central thrust force. Only vertical components of cable forces are required by this algorithm, and the total cable forces can be determined during the shape analysis of arch axis. Optimization technique is employed for the determination of vertical components of cable forces. The validty and effectiveness of the proposed arlorithm are illustrated with a case study of a cable-stayed bridge with arch-shaped tower.
出处
《工程力学》
EI
CSCD
北大核心
2009年第2期131-136,共6页
Engineering Mechanics
关键词
斜拉桥
拱轴线
逐段算法
指定状态法
优化分析
合理设计
cable-stayed bridge
arch axis
incremental algorithm
specified state
optimization
resonable design
