异形独塔斜拉桥参数敏感性分析

Analysis of Parameters' Sensitivenes of Cable-stayed Bridge with Shaped Single Tower

为了降低施工过程造成的偏差对成桥状态的影响,对异形独塔斜拉桥进行更准确施工监控,对桥梁设计参数进行了敏感性分析,确定影响成桥状态设计参数的敏感性,进而在施工过程中采用修正主要设计参数偏差忽略次要设计参数偏差的方法,对异形独塔斜拉桥进行控制。以安徽省某大桥为案例,对桥梁模型中设计参数进行了对比分析,分别详细分析了桥梁结构自重(施工临时荷载)、桥梁整体刚度、混凝土收缩徐变、整体温度等因素对异形独塔斜拉桥成桥状态的影响。分析结果表明大桥结构自重、斜拉索索力和整体温度对大桥影响较大,而桥梁的整体刚度和混凝土收缩徐变对桥梁成桥状态的影响较小。

In order to control the construction of shaped cable-stayed bridge with single tower more accurately,In this paper,the design parameters of the bridge has carried on the sensitivity analysis,then the sensitivity of design parameters effects as bridge completion state is determine. In last shaped cablestayed bridge with single tower is controlled through modifying the deviation caused by main design parameters and ignore the minor design parameters. Taking a bridge of Anhui Province as a case,through the establishment of Midas bridge model,a detailed quantitative analysis of the bridge structure about the weight of construction（ temporary load） 、structural stiffness,creep and shrinkage of concrete,temperature about bridge completion state of cable-stayed bridge with shaped single tower. The result of analysis shows that structure weight、cable force of suspension bridge and temperature of environment bridge system have a greater effect on the bridges than the shrinkage and creep in concrete.