独塔混合梁斜拉桥参数灵敏度分析

Parameter Sensitivity Analysis of Single-Tower Cable-Stayed Bridge with Mixed Beam

为提高桥梁监控单位复核仿真模型的效率,同时研究施工过程中独塔混合梁斜拉桥不同参数对成桥状态的影响,该文以跨径(200+68+46)m的佛山同济路斜拉桥为工程背景,采用单一控制变量法和响应面‒蒙特卡罗法对斜拉桥进行灵敏分析,以主梁线形、主塔线形、主梁应力及斜拉索成桥索力变化作为控制目标,研究主梁自重、初张索力等参数变化对成桥状态的影响。结果表明:主梁自重和初张索力属于灵敏参数,施工临时荷载属于较灵敏参数,主梁刚度和索弹性模量属于非灵敏参数。

To improve the efficiency of the review simulation model of the bridge monitoring unit and study the influence of different parameters of the single-tower mixed beam cable-stayed bridge on the bridge’s completed state in the construction process,this paper,taking the cable-stayed bridge of Tongji Road in Foshan with a span of(200+68+46)m as the engineering background,adopted the single control variable method and response surface-Monte Carlo method for sensitivity analysis.Taking the main beam alignment,main tower alignment,main beam stress,and the variation of cable-stayed bridge force as control objectives,this paper studied the influence of the variation of main beam weight,initial tensile force,and other parameters on the state of the completed bridge.The results show that the dead weight of the main beam and the initial tensile force are sensitive parameters.Construction temporary load is a sensitive parameter,and girder stiffness and cable elastic modulus are non-sensitive parameters.