钢筋混凝土柱低周疲劳全过程累积损伤性能简化分析方法

发布时间：2018-02-24 01:24

本文关键词： 钢筋混凝土柱低周疲劳混凝土损伤模型割线刚度剩余承载能力极限变形　出处：《土木工程学报》2016年08期 　论文类型：期刊论文

【摘要】：为了有效预测地震作用下钢筋混凝土柱的低周疲劳损伤累积程度与损伤后的剩余承载能力,提出了一种基于单调荷载-位移关系并考虑低周疲劳效应的钢筋混凝土柱损伤承载能力简化分析方法。首先,根据自洽方法并假设裂纹符合Weibull分布,提出了基于细观机理的混凝土损伤模型,给出了混凝土损伤指标与有效模量、应变的定量表达式,并通过非线性数值分析得到了钢筋混凝土柱的单调荷载-变形曲线;然后,通过分析纵筋的塑性低周疲劳损伤,建立了基于割线刚度的钢筋混凝土柱低周疲劳变形性能损伤计算模型,模型参数根据试验研究获得,推导了柱割线刚度和抗力的衰减规律计算公式;最后,在以上工作的基础上,分析低周疲劳作用对钢筋混凝土柱底截面混凝土和纵筋应变的累积增大效应,得到混凝土损伤后的有效弹性模量,提出了考虑低周疲劳损伤后的钢筋混凝土柱承载能力和变形能力计算方法。编制非线性损伤分析程序,对损伤后试验柱进行了计算分析。结果表明,该方法得到的计算值与试验值的相对误差处于合理范围之内,验证了该方法的可靠性和实用性。
[Abstract]:In order to effectively predict the accumulation degree of low cycle fatigue damage and the residual bearing capacity of reinforced concrete columns under earthquake, A simplified analysis method for damage bearing capacity of reinforced concrete columns based on monotone load-displacement relationship and considering low cycle fatigue effect is proposed. Firstly, according to the self-consistent method and assuming that the crack conforms to Weibull distribution, A concrete damage model based on mesoscopic mechanism is proposed. The quantitative expressions of concrete damage index, effective modulus and strain are given, and the monotone load-deformation curves of reinforced concrete columns are obtained by nonlinear numerical analysis. By analyzing the plastic low cycle fatigue damage of longitudinal bars, a damage calculation model of low cycle fatigue deformation performance of reinforced concrete columns based on Secant stiffness is established. The model parameters are obtained according to the experimental results. Based on the above work, the cumulative increasing effect of low cycle fatigue on the strain of reinforced concrete column bottom section concrete and longitudinal reinforcement is analyzed. The effective elastic modulus of concrete after damage is obtained. A method for calculating the bearing capacity and deformation capacity of reinforced concrete columns considering low cycle fatigue damage is proposed. A nonlinear damage analysis program is developed. The results show that the relative error between the calculated value and the experimental value is within a reasonable range, which verifies the reliability and practicability of the method.
【作者单位】：北京市市政工程研究院;地下工程建设预报预警北京市重点实验室;
【基金】：中国建筑科学研究院应用基础研究项目(20120112330730070)
【分类号】：TU375.3

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