基于有限元的混凝土收缩徐变参数敏感性分析

Research on Creep Behavior and Parameter Sensitivity of Concrete Based on Finite Element Analysis

摘要: 混凝土是当前应用最广泛的建筑材料，其徐变特性对结构的耐久性和安全性有显著影响。因此，混凝土徐变的预测已成为结构设计中不可或缺的环节。本文基于JTG3362-2018中的收缩徐变模型，对ABAQUS软件进行二次开发，编写相应的子程序以计算结构的收缩徐变。并探讨不同湿度与混凝土强度对构件徐变效应的影响。结果显示，这两种条件对混凝土的收缩和徐变都有显著影响。其中，徐变对混凝土强度变化的敏感性更为突出，而收缩则对环境湿度变化表现出更强的敏感性。

Abstract: Concrete is the most widely used building material today, and its creep characteristics have a significant impact on the durability and safety of structures. As a result, predicting concrete creep has become an essential aspect of structural design. This paper utilizes the shrinkage and creep model from JTG3362-2018 and involves a secondary development of ABAQUS software, where specific subroutines are created to calculate the shrinkage and creep of structures. Furthermore, the study investigates how different humidity levels and concrete strength influence the creep behavior of components. The findings indicate that both factors significantly affect the shrinkage and creep of concrete. Notably, creep is more sensitive to changes in concrete strength, while shrinkage shows a stronger sensitivity to variations in environmental humidity.