暗涵墙体混凝土温度场与应力场仿真分析

发布时间：2018-04-18 15:32

本文选题：暗涵混凝土墙体 + 温度场　；参考：《水利水电技术》2017年11期

【摘要】：为了研究暗涵墙体施工早期混凝土的开裂情况,从混凝土温度变形出发,对暗涵中墙裂缝成因进行了分析。根据稳态温度场理论,采用ANSYS有限元分析软件,混凝土热单元类型选用solid70,建立了求解中墙温度场的三维实体模型,研究了不同工况组合下的暗涵墙体温度场分布规律。根据暗涵墙体混凝土温度场进行温度应力的仿真,研究了暗涵中墙混凝土温度应力分布及变化规律。结果表明:暗涵中墙内外表面的压应力近似相等,与温度呈线性关系,中墙内外表面不存在拉应力;暗涵中墙中间截面的压应力与温度差成反比,而拉应力与温差近似成正比;最大拉应力为1.92 MPa,出现在中墙中间截面,其值在混凝土的抗拉强度范围内,故中墙几乎不会开裂。通过设置合理的边界条件与环境条件,可为相关混凝土施工温度裂缝控制提供参考依据。
[Abstract]:In order to study the cracking of concrete in the early stage of the construction of the hidden culvert wall, the causes of the cracks in the middle wall of the hidden culvert are analyzed from the point of view of the temperature deformation of the concrete.According to the theory of steady-state temperature field, using ANSYS finite element analysis software and using solid70 as the type of concrete thermal element, a three-dimensional solid model for solving the temperature field of middle wall is established, and the distribution law of the temperature field of dark culvert wall under different working conditions is studied.Based on the simulation of the temperature field of the concrete of the hidden culvert wall, the distribution and variation of the temperature stress of the concrete in the middle wall of the hidden culvert are studied.The results show that the compressive stress on the inner and outer surface of the middle wall is approximately equal, which is linearly related to the temperature, and there is no tensile stress on the inside and outside of the middle wall, and the compressive stress in the middle section is inversely proportional to the temperature difference, while the tensile stress is approximately proportional to the temperature difference.The maximum tensile stress is 1.92 MPA, which appears in the middle section of the middle wall, and its value is within the range of the concrete tensile strength, so the middle wall can hardly crack.By setting reasonable boundary conditions and environmental conditions, it can provide reference basis for the control of temperature cracks in concrete construction.
【作者单位】：华北水利水电大学资源与环境学院;
【基金】：国家自然科学基金项目(51009067) 河南省重点科技攻关项目(132102210113,142102210111)
【分类号】：TV544

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