摘要
针对预应力结构中预应力筋应力松弛效应的精确计算问题,基于fib 2010《欧洲混凝土结构规范》给出的预应力筋应力与时间的松弛关系,推导表征预应力筋应力松弛的率型本构模型,并构建该本构模型的数值迭代算法,在ABAQUS的UMAT二次开发平台上编写该模型的数值求解程序。分别针对无黏结预应力结构和有黏结预应力结构2种情况,对程序的正确性和适用性进行了验证。研究表明编写的计算程序可实现预应力结构中应力松弛效应的准确模拟,提出的应力松弛模型的程序开发思路也适用于ANSYS、ADINA等有限元软件。
Aiming to address the precise calculation issue of stress relaxation effect in prestressed structures,a rate-type constitutive model was developed based on the relaxation relationship between stress and time as outlined in the fib 2010 European Code for Concrete Structures.This model characterizes stress relaxation of prestressed reinforcement under varying strain conditions,and a numerical iteration algorithm was formulated for this constitutive model.Anumerical solution program for this model was developed using the UMAT secondary development platform of ABAQUS.The accuracy and applicability of the program were validated for both unbonded prestressed structures and bonded prestressed structures.Research has demonstrated that the program accurately simulates the stress relaxation effect in prestressed structures.Moreover,the proposed program development approach for stress relaxation models is also suitable for finite element software such as ANSYS and ADINA.
作者
向华伟
张江涛
范兴朗
XIANG Huawei;ZHANG Jiangtao;FAN Xinglang
出处
《科技创新与应用》
2025年第4期21-24,共4页
Technology Innovation and Application
基金
中国博士后科学基金(2023M734085)。
关键词
预应力结构
应力松弛
本构模型
数值算法
二次开发
prestressed structure
stress relaxation
constitutive model
numerical algorithm
secondary development
