西非地区点支承异形板桥的梯度温度效应分析  

Analysis of Gradient Temperature Effect for Special-shaped Slab Bridges in West Africa

作　　者：杨贤康 

机构地区：[1]中国土木工程集团有限公司,北京100038

出　　处：《铁道建筑技术》2016年第1期30-34,共5页Railway Construction Technology

基　　金：中国铁建股份有限公司科技研究开发计划项目(12-C01)

摘　　要：以西非地区某高速公路项目中一点支承异形板桥为工程背景,根据该建设项目的实际地理位置和气候特点等建立了日照温度场数值模型,并依此提出了适用于该项目的温度梯度计算曲线;通过3种不同的温度梯度计算模式(分别为中国公路桥规、英国桥规中的温度梯度计算曲线和通过日照温度场模拟得到的温度梯度计算曲线)对该桥梁进行了梯度温度效应分析,结果表明当温度梯度计算曲线选择不当时,计算结果将导致较大的偏差;通过全桥空间有限元分析,对该桥梁各荷载工况的内力结果进行了比较,结果表明梯度温度引起的荷载效应远远大于其他活载引起的荷载效应。Taking a point-supported special-shaped slab bridge in an expressway project of West Africa as an engineering background, the numerical model of sunshine temperature field was established according to the actual geographical location and climate characteristics of the project, and then the gradient temperature curve for this project was obtained. The gradi- ent temperature effect for the bridge was analyzed based on three kinds of different gradient temperature models （ the gradi- ent temperature calculated curves were respectively from the Bridge Regulations of China and Britain, and sunshine temper- ature field simulation）. The calculation results showed that inappropriate choice of gradient temperature calculation curve might lead to a rather big deviation. The calculating results of internal forces under each load condition were compared by the analysis of spatial finite element model of the bridge. The results illustrated that the loading effect caused by gradient temperature was much larger than the loading effects caused by other live loads.

关 键 词：现浇异形板 英国桥规 温度场 板柱固结 梯度温度 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]