单箱三室混凝土桥合龙段温度场研究  

Research on Temperature Field of Closure Segment of A Single Box with Three Cells Concrete Girder Bridge

作　　者：潘旦光[1] 吴勇 程业[1] 

机构地区：[1]北京科技大学土木系,100083 [2]中国水电建设集团十五工程局有限公司,西安710068

出　　处：《特种结构》2017年第4期61-65,共5页Special Structures

基　　金：北京市自然科学基金项目(8143037)

摘　　要：为了研究箱梁桥合龙段混凝土温度场变化,以西安西咸新区红光路沣河大桥为研究对象,对合龙段施工期间混凝土温度场进行了原位测试。实测结果表明:(1)混凝土温度变化分为明显的两个阶段:升温阶段与降温阶段,混凝土温升值最大达到51.22℃;(2)混凝土内外存在温差,最大可达27.42℃,混凝土表面与环境温度之间最大可达24.06℃;(3)在混凝土出现温度峰值后,第一天的降温可达16.20℃。这些参数表明需要对合龙段施工进行温度控制以避免裂纹的出现。In order to study the temperature field characteristics of the closure segment of concrete box girder bridge, the temperature variation during construction of the closure segment were measured based on Hongguang Road Fenghe Bridge. Experimental results showed that： （1） The temperature change of concrete is divided into two stages： the rising stage and the cooling stage. The temperature rise of concrete can reach up to 51.22℃. （2） There is a temperature difference between inside and outside of the concrete, the maximum temperature difference can reach 27.42℃. There is a temperature difference between the surface of concrete and the ambi- ent temperature which can reach 24.06℃. （3） After reached the peak temperature, the maximum temperature decrease of the concrete would be 16.20℃ in one day. All of the above factors show that it is necessary to carry out the temperature-control construction to avoid the concrete crack.

关 键 词：合龙段 温度场 水化热 箱梁桥 原位测试 

分 类 号：U445.57[建筑科学—桥梁与隧道工程]