摘要
以某U形薄壁渡槽为例,采用Midas FEA建立三维实体有限元模型,以正弦函数模拟昼夜温差变化,通过计算分析,得到了U形薄壁渡槽在养生期的温度和应力变化,同时通过改变环境温度函数,对比分析了遭遇寒潮后对U形薄壁渡槽温度和应力变化的影响.结果表明,U形薄壁渡槽在养生期内的温度应力均在混凝土的允许抗拉强度范围之内,且各龄期的混凝土抗裂系数均大于混凝土抗裂安全系数,混凝土出现开裂的风险不大;遭遇寒潮后,U形薄壁渡槽在养生期的温度下降,温度应力升高,混凝土抗裂系数进一步下降,渡槽混凝土开裂的风险显著升高;U形薄壁渡槽在养生期遭遇寒潮后,应当进一步加强温度和应力监测.
With a U-shaped thin-walled aqueduct as an example,Midas FEA was used to establish a threedimensional solid finite element model,and the sine function was used to simulate the temperature difference between day and night.Through calculation and analysis,the temperature and stress changes of the U-shaped thin-walled aqueduct during the curing period were obtained.At the same time,by changing the ambient temperature function,the effects of the cold wave on the temperature and stress changes of the U-shaped thinwalled aqueduct were compared and analyzed.The research shows that the temperature stress of the U-shaped thin-walled aqueduct during the concrete curing is within the allowable tensile strength range of concrete,and the concrete crack resistance coefficient of each age is greater than the concrete crack resistance safety factor,and the risk of concrete cracking is not high.After encountering a cold wave,the temperature of the U-shaped thin-walled aqueduct during the concrete curing decreases,the temperature stress increases,the crack resistance coefficient of concrete is further reduced,and the risk of concrete cracking in the aqueduct increases significantly.
作者
唐杨
张丽
王国炜
刘佳杰
亓兴军
TANG Yang;ZHANG Li;WANG Guo-wei;LIU Jia-jie;QI Xing-jun(Countryside Highway Administration Bureau of Wufeng Tujia Autonomous County,Yichang 443413,Hubei,China;Jinan Hualu Zhongjiao Highway Design Co.LTD.,Jinan 250014,Shandong,China;BeijingMunicipal Road and Bridge Group Co.Ltd.,Beijing 100045,China;School of Transportation Engineering,Shandong Jianzhu University,Jinan 250101,Shandong,China)
出处
《喀什大学学报》
2023年第6期52-57,共6页
Journal of Kashi University
关键词
U形薄壁渡槽
水化热
仿真分析
寒潮影响
有限元分析
温度应力
U-shaped thin-walled aqueduct
hydration heat
simulation analysis
the effect of cold wave
finite element analysis
temperature stress