大跨度连续刚构桥施工期0号块温度效应分析

Temperature effect of long-span continuous rigid frame bridge of segment No.0 during construction

为了研究混凝土箱梁桥的温度效应问题,以一座大跨度预应力混凝土连续刚构桥为工程背景,在施工过程中,进行了温度效应观测.在实测数据的基础上,提出了一种适合该桥所在地区的混凝土箱梁温度梯度模式.运用有限元方法,对该桥的温度效应进行了理论计算,计算了温度作用所导致的温度应力和变形,计算值与实测值的比较结果说明了该温度梯度模式的适用性.

In order to study the temperature effect of concrete box girder bridge,taken a long-span continuous rigid frame bridge as an example, temperature effect was studied during the construction. A thermal gradient model of concrete box girder, which could apply in area of bridge,was presented firstly. Then using the finite element method, the temperature effect is theoretically analyzed, and the calculated results agree well with the measured data. It is possible to conclude that temperature gradients mode presented is appropriate. The stress and deformation caused by temperature effect is computed.