人字形桥塔-横撑体系受力分析及优化布置方案比选

Force Analysis of Herringbone Bridge Pylon and Cross Brace System,and Comparison of Optimal Arrangement Scheme

对某桥主塔工程的桥塔-横撑体系进行受力分析,利用应力、位移、施工难度等指标综合讨论了以横撑位置与初始力为指标的3种不同桥塔-横撑体系对曲线桥塔线形控制的影响。桥塔施工采用顶升托架同步施工,对横撑受力进行实时监测。曲线桥塔在浇筑过程中必须考虑重力、温度对其线形的影响,通过设置预拱度及横撑等方式确保成桥线形符合设计要求。桥塔横梁施工支撑方案要进行优化设计,利用位移与应力的综合影响确定合理的支撑方案。该桥塔-横撑体系的稳定性与施工可行性满足实际需求,可为桥塔的顺利修建提供技术支撑。

The study discusses the influence of three different pylon-strut systems with the position of strut and the initial force on the linear control of curved bridge tower comprehensively with the indexes of stress,displacement and construction difficulty,etc.The construction of bridge tower adopts the simultaneous construction of jacking bracket to monitor the transverse support force in real time.The influence of gravity and temperature on the linear shape of the curved bridge tower must be considered in the process of pouring,and the linear shape of the bridge must meet the design by setting the pre-arch degree and cross bracing.The construction support scheme of bridge tower beam should be optimized,and the reasonable support scheme should be determined by the comprehensive influence of displacement and stress.The stability and construction feasibility of the pylon-cross support system meet the actual needs,and can provide technical support for the smooth construction of bridge pylon.