摘要
本文通过钢筋试件在反复荷载作用下σ-ε关系的试验研究,探讨了不同加载历史对σ-ε关系的影响。试验表明,历经循环加载后的σ-ε曲线与上一荷载循环与之同方向荷载的卸载点应力、应变值及当前加载循环的起始应变值有关,与历经的荷载循环次数基本无关;其σ-ε骨架线不再具有与单调加载的σ-ε曲线同样的屈服台阶长度,较早进入了硬化阶段。本文在试验基础上提出了考虑加载历史影响的数学模型。计算曲线与试验曲线符合良好,从而为钢筋砼结构的非线性计算分析提供了适用的材料本构关系。
Through experiments of 18 reinforcing steel specimens, the offect of different load histories on the stress strain relationship of reinforcing steel within inelastic range under reversed loading has been studied. The experiments indicate that the σ-ε behavior is mainly depending on the level of strain at the beginning of reloading and the values of strain and stress at the unloading of the latest cycle, but it is independent from the number of loading cycles. The yield plateau of skeleton curve under reversed cyclic loading is much shorter than that of the virgin curve, in other words, the point starting to harden under reversed cyclic loading is much earlier than that of monotonic loading. Based on the experiments, a mathematic model of σ-ε in consideration of the effect of loading history has been presented. The calculated and measured curves agree well with each other. The cons titutive model presented in this paper is aecu-rate enough and simple in application for the inelastic analysis of reinforeed conerete structunes.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
1992年第6期41-48,共8页
Journal of Building Structures
基金
国家自然科学基金
