连续箱梁桥在不同温度梯度模式下的效应分析*
白纬宇，薛刚
（内蒙古科技大学 建筑与土木工程学院，内蒙古 包头 014010）
关键词：连续箱梁；温度梯度；温度应力；汽车荷载
中图分类号：U441.5 文献识别码：A
摘要：选取国内外四种温度梯度规范作为计算工况,对一座在役连续箱梁桥的温度效应进行分析，并与汽车活载所引起的效应进行对比。分析结果表明：不同温度梯度模式下的效应分布具有一定相似性,但随着温差分布形态及特征值的不同，温度效应值相差很大。温度效应在主梁底缘引起拉应力，和汽车荷载效应引起的拉应力相当，因此温度的作用在桥梁设计中应当被充分考虑。
The analysis of the effect of continuous boxgirder bridge under different temperature gradient mode
BaiWeiyu ，Xue Gang
(Architecture and Civil Engineering School,InnerMongolia University of Science and Technology，Baotou014010，China)
Keywords:continuous box girder；temperaturegradient； thermal stress； vehicle load
Abstract: Based on an in-service continuous box beambridge, the temperature effect under four kinds of temperature gradientstandard at home and abroad were analyzed and compared with the effect undervehicle live load. The results show that the distribution of effect underdifferent temperature gradient mode has a certain similarity, but the value of temperatureeffect varies greatly with the difference of temperature distributional patternand characteristic value. Moreover, the effect of temperature causes tensilestress on the primary beam hemline corresponding to the effect of vehicle load.Therefore, the action of temperature should be fully considered in bridge design.