应用徐变恢复效应建立的应变全量递推方法

Total variables recurrence method of concrete creep by use of creep recovery effect

摘要:

在统一当前应用广泛的各类徐变预测模式的条件下,建立高效、通用的徐变计算理论和方法,应从徐变本身的基本性质入手,从根本上把握其内在规律.在初步归纳了徐变统一理论基本特征的基础上,应用混凝土徐变恢复效应理论和应力冲量持时函数,建立了不需记录全部应力历史的全量递推方法,推导了应变全量递推表达式.研究表明,该方法适于不同类型的徐变预测模型和加载模式,能较大幅度提高计算效率,并满足计算精度要求.

Abstract:

Based on all types of widely used prediction modes of concrete creep,the basic creep characteristics were used to build up an efficient and universal calculation method of creep.The feature of unified creep theory was simply summarized.The total variables recurrence formula and its calculation flows were deduced.In the deduction process,creep recovery theory and stress impulse function were analyzed.This method can meet the precision requirement by memorizing parts of stress history and improve the calculation efficiency greatly.It can be used for different types of creep and loading modes.