早期混凝土黏弹性行为的温度-结构场耦合分析

发布时间：2018-04-28 04:40

本文选题：早期混凝土 + 水化度　；参考：《建筑结构学报》2014年06期

【摘要】：为了模拟早期混凝土温度应力,基于ABAQUS二次开发平台,编写考虑水泥水化度影响的温度场计算用户子程序和考虑成熟度影响的黏弹性应力场计算用户子程序,并通过与理论公式对比验证子程序开发的合理性。采用温度场和应力场耦合方法,将子程序应用于研究某大体积混凝土承台的早期温度应力变化规律。结果表明,在考虑和未考虑水泥水化度的影响下,温度场变化规律相同,但考虑水泥水化度影响后温度峰值低于未考虑水泥水化度影响的情况;在考虑和未考虑早期混凝土徐变的影响下,表面点和中心点的应力值在浇筑早期都有较大程度的减小,说明混凝土的徐变特性对早期混凝土的拉、压应力增长都有一定的削弱作用;因早期混凝土抗拉强度较低,在承台表面易产生大致垂直于边缘的温度裂缝,在实际工程中应予以关注。
[Abstract]:In order to simulate the temperature stress of early concrete, based on the second development platform of ABAQUS, the user subprogram for calculating temperature field considering the influence of cement hydration degree and the subprogram for calculating viscoelastic stress field considering the influence of maturity are compiled. The rationality of the development of subroutine is verified by comparing with the theoretical formula. By using the coupling method of temperature field and stress field, the subroutine is applied to study the early temperature stress variation of a mass concrete cap. The results show that the variation law of temperature field is the same when the cement hydration degree is considered and not taken into account, but the temperature peak value after considering the cement hydration degree is lower than that without considering the cement hydration degree. Considering and not considering the influence of early concrete creep, the stress values of surface point and center point decrease to a large extent in the early stage of pouring, which indicates that the creep characteristic of concrete has a great effect on the tensile behavior of early concrete. Due to the low tensile strength of early concrete, temperature cracks perpendicular to the edge of the cap surface are easy to be produced, which should be paid attention to in practical engineering.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家自然科学基金创新研究群体科学基金项目(51021004);国家自然科学基金项目(51279126)
【分类号】：TU528.01

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