环境中气候温度变化影响下钢筋混凝土管道的应力-应变状态

R. Rybak, V. Коvalchuk, B. Parneta, O. Parneta, O. Bal, V. Boiarko
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引用次数: 0

摘要

进行了环境中气候温度变化影响下运输结构温度场、应力和变形确定的研究分析。确定了环境中气候温度的变化会引起运输结构的温度应力和变形。介绍了钢筋混凝土管道在使用过程中的主要损伤和缺陷。在环境中气候温度变化引起的变温作用下,金属结构与钢筋混凝土管接触时产生的温度应力和变形水平是钢筋混凝土管缺陷和损伤的原因之一。建立了考虑环境气候温度变化作用下金属波纹结构钢筋混凝土管道温度场和应力的有限元模型。计算了正环境温度作用下钢筋混凝土管道纵向和横向温度场的分布。确定了温度场在管道表面的分布是不均匀的。在管道的横向,钢筋混凝土和金属壳之间记录了+10°C的温差。计算了管道在正环境温度作用下的温度应力和变形。确定了在金属管道与钢筋混凝土管道接触处,正应力最大。同时,管道横向温度应力值为321.61 kPa,纵向温度应力值为321.61 kPa,竖向温度应力值为253.84 kPa。通过对未来气候温度变化对钢筋混凝土管材影响的理论和实践的改进,可以采用合适的材料和方法对钢筋混凝土管材进行加固,使其符合实际使用条件,从而提高钢筋混凝土管材的使用寿命。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
STRESS-STRAIN STATE OF REINFORCED CONCRETE PIPES UNDER THE INFLUENCE OF CLIMATIC TEMPERATURE CHANGES IN THE ENVIRONMENT
The research analysis on determining temperature fields, stresses and deformations of transport structures under the influence of variable climatic temperature changes in the environment is carried out. It is established that climatic temperature changes in the environment cause the occurrence of temperature stresses and deformations of transport structures. The main damages and defects of reinforced concrete pipes in operation are given. It is established that one of the causes of defects and damages to reinforced concrete pipes is the level of temperature stresses and deformations that occur in the contact of a metal structure with a reinforced concrete pipe due to the action of variable temperatures caused by climatic temperature changes in the environment. A finite element model is developed for estimating the temperature fields and stresses of reinforced concrete pipes reinforced with metal corrugated structures, taking into account the action of variable climatic temperatures of the environment. The distribution of temperature fields in the transverse and longitudinal directions of reinforced concrete pipe under the action of positive ambient temperatures is calculated. It is established that the temperature field will be unevenly distributed over the pipe surface. In the transverse direction of the pipe, a temperature difference of +10° C was recorded between the reinforced concrete and metal shells. The calculation of temperature stresses and deformations of the pipe under the action of positive ambient temperatures is performed. It is established that the maximum value of normal stresses occurs at the contact of a metal pipe with a reinforced concrete one. At the same time, the value of temperature stresses in the transverse direction of the pipe is 321.61 kPa, in the longitudinal direction it is 321.61 kPa and in the vertical direction, it is 253.84 kPa. It is established that improving the theory and practice of determining the impact of climatic temperature changes on reinforced concrete pipes in the future will allow using appropriate materials and methods to strengthen these structures that meet the real conditions of pipe in operation, which will cause an increase in the service life of these structures in operation.
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