渡槽在折线温差分布下的横向温度应力计算
|
摘要
为分析渡槽在折线温差分布下的横向温度应力,运用公路桥梁规范中折线温差分布函数,推导了渡槽在折线温差分布下横向温度自约束应力和框架约束应力计算公式,计算了渡槽在冬季骤然降温作用下的温度应力。计算表明,渡槽外表面总应力是壁厚和温差的函数,当壁厚不变,温差减小50%时,其温度应力也相应减小50%,当温差不变,壁厚减小50%时,其温度应力减小21%;与指数温差分布函数计算的温度应力值相比,该方法计算值较小,在设计时若按此考虑渡槽温度荷载,则能显著提高渡槽的安全性能。
In order to analyze aqueduct transverse temperature stress under polygonal distribution of temperature difference,polygonal temperature difference distribution function of highway bridge specification is used to deduce the calculation formula of aqueduct transverse thermal self-constraint stress and framework-constraint stress.And then aqueduct thermal stress is calculated under temperature suddenly dropping in winter.The results show that the total stress of aqueduct outer surface is the function of wall thickness and temperature difference;when wall thickness is a constant and the temperature difference decreases by 50%,the stress is also decreased by 50%;when the temperature difference is a constant and the wall thickness decreases by 50%,the stress is decreased by 21%;the aqueduct thermal stress is smaller than that of exponential distribution function method.Thus,it will significantly improve the safety performance of aqueduct when considers aqueduct temperature load in design.
In order to analyze aqueduct transverse temperature stress under polygonal distribution of temperature difference,polygonal temperature difference distribution function of highway bridge specification is used to deduce the calculation formula of aqueduct transverse thermal self-constraint stress and framework-constraint stress.And then aqueduct thermal stress is calculated under temperature suddenly dropping in winter.The results show that the total stress of aqueduct outer surface is the function of wall thickness and temperature difference;when wall thickness is a constant and the temperature difference decreases by 50%,the stress is also decreased by 50%;when the temperature difference is a constant and the wall thickness decreases by 50%,the stress is decreased by 21%;the aqueduct thermal stress is smaller than that of exponential distribution function method.Thus,it will significantly improve the safety performance of aqueduct when considers aqueduct temperature load in design.
引文
[1]朱伯芳.大体积混凝土温度应力与温度控制(第二版)[M].北京:中国水利水电出版社,2012.
[2]季日臣,严娟,苏小凤.混凝土箱形渡槽日照高温下结构安全研究[J].南水北调与水利科技,2013,11(6):90-92,109.
[3]宋田.连续刚构渡槽温度场及温度应力分析[D].重庆:重庆交通大学,2013.
[4]严娟,季日臣,马虎迎.箱形渡槽越冬期间表面保温能力计算[J].水利水运工程学报,2013(6):88-91.
[5]严娟,季日臣.箱形渡槽冬季输水工况下温度场与温度应力研究[J].甘肃科技,2013,29(21):123-124,157.
[6]彭敏瑞.冰荷载、温度荷载对大型预应力渡槽结构的影响研究[D].天津:天津大学,2007.
[7]JIGD62-2004,公路钢筋混凝土及预应力混凝土桥涵设计规范[S].北京:人民交通出版社,2004.
[8]张元海,李乔.预应力混凝土连续箱梁桥的温度应力分析[J].土木工程学报,2006,29(3):98-102.
[9]聂玉东.寒区大跨径混凝土箱梁桥温度场及温度效应分析[D].哈尔滨:哈尔滨工业大学,2013.
[10]刘兴法.混凝土结构的温度应力分析[M].北京:人民交通出版社,1991.
[11]季日臣,夏修身,陈尧隆,等.骤然降温作用下混凝土箱形渡槽横向温度应力分析[J].水利水电技术,2007,38(1):50-52.
[2]季日臣,严娟,苏小凤.混凝土箱形渡槽日照高温下结构安全研究[J].南水北调与水利科技,2013,11(6):90-92,109.
[3]宋田.连续刚构渡槽温度场及温度应力分析[D].重庆:重庆交通大学,2013.
[4]严娟,季日臣,马虎迎.箱形渡槽越冬期间表面保温能力计算[J].水利水运工程学报,2013(6):88-91.
[5]严娟,季日臣.箱形渡槽冬季输水工况下温度场与温度应力研究[J].甘肃科技,2013,29(21):123-124,157.
[6]彭敏瑞.冰荷载、温度荷载对大型预应力渡槽结构的影响研究[D].天津:天津大学,2007.
[7]JIGD62-2004,公路钢筋混凝土及预应力混凝土桥涵设计规范[S].北京:人民交通出版社,2004.
[8]张元海,李乔.预应力混凝土连续箱梁桥的温度应力分析[J].土木工程学报,2006,29(3):98-102.
[9]聂玉东.寒区大跨径混凝土箱梁桥温度场及温度效应分析[D].哈尔滨:哈尔滨工业大学,2013.
[10]刘兴法.混凝土结构的温度应力分析[M].北京:人民交通出版社,1991.
[11]季日臣,夏修身,陈尧隆,等.骤然降温作用下混凝土箱形渡槽横向温度应力分析[J].水利水电技术,2007,38(1):50-52.