寒流作用下钢管混凝土高墩温度场观测与效应分析  

Observation and Analysis of Temperature Effect of CFST High-rise Pier under Cold Current Effect

作　　者：刘扬[1] 肖新辉[1] 

机构地区：[1]长沙理工大学土木与建筑学院,湖南长沙410076

出　　处：《公路交通科技》2011年第7期61-66,共6页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(50608009);教育部新世纪优秀人才支持计划项目(NCET-10-0139);交通部应用基础研究项目(2006319825070);湖南省教育厅科技项目(06c112)

摘　　要：基于雅泸高速公路腊八斤特大桥温度场连续观测结果,研究了寒流作用下钢管混凝土高墩温度场的分布和变化规律。利用数理统计方法,拟合了截面寒流降温模式的温度梯度,结果表明:沿钢管混凝土柱截面径向温度变化中,越靠近钢管中心,温度变化越滞后于大气温度;寒流作用下钢管混凝土柱截面径向的温度梯度可用三次多项式来表示;腹板温差可用指数函数来表示。负温差使高墩表面产生较大的拉应力与墩顶偏位,且对成桥后的内力有着不可忽视的影响。Based on the continuously observed data of temperature field of Labajin Bridge on Ya＇an-Lugu expressway,the temperature distribution and variation of the concrete-filled steel tube（CFST） high-rise pier were investigated.The temperature gradient of the cooling mode was fitted by using mathematical statistical method.The results show that（1） temperature variations along the radius of CFST section,the closer the distance between measuring point and the pier center is,the more the temperature variation lags behind atmosphere temperature;（2） under cold current effect,temperature gradient along the radius of CFST section can be demonstrated by cubic polynomial;（3） an exponential function can be used to describe temperature difference in the webs;（4） the temperature difference of the cooling mode results in tensile stress on the surface of the pier and offset at the top of pier,which has important influence on structural internal force.

关 键 词：桥梁工程 钢管混凝土 寒流 温度场 温度效应 

分 类 号：U445.559[建筑科学—桥梁与隧道工程]