封闭式箱形渡槽冬季输水期热力研究  

Thermo-mechanical Characteristics of Closed Box Aqueduct During Winter Water Transfer Period

作　　者：马虎迎 MA Huying(Lanzhou petrochemical college o f vocational Technology, Lanzhou, Gansu 730060, Chin)

机构地区：[1]兰州石化职业技术学院,甘肃兰州730060

出　　处：《水利与建筑工程学报》2018年第2期189-193,共5页Journal of Water Resources and Architectural Engineering

基　　金：兰州市创新创业项目"兰州石化土木工程技术协调创新中心"

摘　　要：为研究冬季输水期封闭式箱形渡槽的温度与应力变化状况,根据热传导理论及水工渡槽的温度边界条件以引洮工程柳林沟渡槽为例利用ANSYS进行冬季输水运行期的热力变化分布仿真分析。计算表明:封闭式箱形渡槽在冬季输水期间降温快,沿板壁厚度方向温度梯度外大内小,内外温差均为二次曲线分布。温度应力总体呈现外部受拉、内部受压的分布状态,各壁板的内外表面在不同时刻出现最大拉应力和压应力,同时板壁最大压应力较最大拉应力具有一定的滞后性。壁板及棱角部位的横向与竖向最大拉应力值超出混凝土抗拉强度设计值,因此,在进行封闭式箱形渡槽结构的设计中应考虑槽身的保温或设置适当的温度钢筋来减小或抵抗一定的温度应力,从而避免裂缝的产生,增强结构的安全性和耐久性。In order to study the temperature and stress change of closed box-shaped aqueduct during winter water transfer period,according to the theory of heat transfer and the temperature boundary of aqueduct,simulation analysis of thermal variation distribution was finished.The calculation shows that the closed box-shaped aqueduct has a rapid cooling rate during the winter water transfer period,and the temperature gradient along the thickness of the wall is large outside and small inside.The temperature stress generally shows the distribution of external tension and internal pressure.The maximum tensile stress occur on the inner and outer surfaces of the slabs at different time points.At the same time,the maximum compressive stress on the slab wall has some lag than the maximum tensile stress.Wall and corner parts of the vertical and horizontal maximum tensile stress value exceeds the tensile strength of concrete design value,therefore in the design of closed box aqueduct structure insulation or temperature to consider appropriate set of steel to reduce or Resistance to a certain temperature stress,thus avoiding the cracks,enhance the safety and durability of the structure.

关 键 词：封闭式箱形渡槽 输水运行期 温度场 仿真分析 安全耐久性 

分 类 号：TV672[水利工程—水利水电工程]