独塔斜拉桥换索过程计算分析研究

建立独塔斜拉桥设计方案的全桥有限元模型,综合考虑主梁内力对成桥索力进行优化；计算施工阶段拉索初拉力.分析逐一卸除各拉索工况下拉索力和应力的变化及其极值；计算各换索工况下主梁和桥塔的应力变化,分析换索过程中桥梁能否正常运营.还对各换索工况下主梁竖向位移进行了分析.

Analysis on Cable Replacement for a Single Tower Cable-stayed Bridge

A finite element model of a single tower cable-stayed bridge was established. An optimization of initial stay-cable force was conducted based on the force of steel box girder; initial stay-cable forces considered con- struction stages were also calculated in this paper. Stay-cable forces and stresses in each cable replacement con- dition were calculated. Extreme values and corresponding variation were analyzed. Stress of box girders and tow- ers were also calculated in order to determine whether limitation of traffic is necessary. At last, vertical displace- ments of box girder i~ each cable replacement condition were analyzed.