大跨连续箱梁桥施工期温度场测定及其影响分析

摘要

以富绥松花江公路大桥为工程背景,通过对箱梁温度数据采集及理论计算分析,得出了施工阶段混凝土箱形截面温度梯度模式,并将其与《公路桥涵设计通用规范》中的温度梯度模式进行了对比分析.在此基础上,详细阐述了温度梯度对大跨径预应力混凝土连续梁桥悬臂施工过程中挠度的影响,提出了施工过程中避免温度梯度影响的有效措施.%Based on the project background of Fu-sui Songhua River Bridge, throngh data collection and theary calculation the temperature gradient pattern of concrete box section in the stage of construction is obtained and then it is compared and analyzed with the one in General Code for Design of Highway Bridges and Culverts. On this basis, the effects of temperature on the deflection in the cantilever construction process of long-span PC continuous girder bridge are described and the effective measures to prevent the adverse effects of temperature in the process are suggested.