大跨度桥梁施工控制影响参数

Discussion on influences of construction control parameters of long-span bridges

施工控制是建筑建筑产业现代化的重要体现之一。为使连续刚构桥成桥状态的线形符合技术要求,桥梁的施工控制是不可或缺的措施。针对大跨度连续刚构桥施工控制的特点,运用软件进行仿真模拟,进行了悬臂施工过程主要参数的敏感性分析,并据此来判定结构对参数的灵敏程度,为施工过程的参数调整提供相应依据,为建筑产业化提供支持。分别对比了在容重变化、混凝土预应力参数和整体升温降温等情况下,连续刚构桥主梁挠度在最大悬臂状态和成桥状态时变化趋势。结果表明,最大悬臂状态下的温度梯度对挠度影响最大,变化峰值可达60mm。容重也对挠度有显著影响,两种状态下挠度变化峰值均在10~25mm之间。

Construction control is an important embodiment of the modernization of the construction industry.In order to ensure the continuous rigid frame bridge require the design of actual state,bridge construction control is an essential measure and step.This paper takes a cross-sea bridge as the basis,using software simulation,exploring the long span continuous rigid frame bridge displacement and stress in various stages of construction,analyzing the parameter sensitivity,supporting for the modernization of the construction industry.Respectively this paper analyzes changing trend and the influence degree of deflection and stress under the biggest cantilever stage and service stage with the change of density of concrete,prestressing parameter and temperature.The results show that local temperature has the biggest influence on deflection under the maximum cantilever stage,and the maximum variation can reach 60 mm.Density of concrete has significant effect on deflection,which peak reach between the 10mm^25mm under two states.