动态荷载下约束再生混凝土本构关系试验研究及其应用

发布时间：2018-03-19 05:11

本文选题：再生混凝土　切入点：动态力学试验　出处：《建筑结构学报》2016年S2期 　论文类型：期刊论文

【摘要】：通过箍筋约束再生混凝土短柱动态力学试验,获得了应力-应变试验曲线,研究应变率效应、箍筋约束效应和再生粗骨料取代率对约束再生混凝土力学和变形性能的影响。基于试验结果,提出了考虑应变率效应、约束效应和再生粗骨料取代率影响的约束再生混凝土(CRAC)单轴受压应力-应变关系模型。将提出的CRAC材料模型应用于再生混凝土结构的动力非线性分析。结果表明:结构动力分析结果和已有试验结果吻合较好,考虑应变率效应后,其计算结果与试验结果更为接近,更能真实地反映结构在地震动下的力学行为。验证了计算程序的可行性,以及所建议的CRAC材料模型的合理性,为再生混凝土结构动力非线性分析和抗震优化设计提供参考。
[Abstract]:The stress-strain test curve is obtained by dynamic mechanical test of regenerated concrete short column confined by stirrups, and the strain rate effect is studied. The effects of stirrups confinement effect and recycled coarse aggregate substitution rate on the mechanical and deformation properties of confined recycled concrete are discussed. Based on the experimental results, the strain rate effect is considered. The uniaxial stress-strain relationship model of confined recycled concrete (CRAC) affected by the constraint effect and the replacement rate of recycled coarse aggregate is proposed. The proposed CRAC material model is applied to the dynamic nonlinear analysis of recycled concrete structures. The results of structural dynamic analysis are in good agreement with the experimental results. When the strain rate effect is considered, the calculated results are closer to the experimental results and can reflect the mechanical behavior of the structures under ground motion more truthfully. The feasibility of the calculation program and the rationality of the proposed CRAC material model are verified. It provides a reference for dynamic nonlinear analysis and seismic optimization design of recycled concrete structures.
【作者单位】：同济大学土木工程学院;南阳师范学院土木建筑工程学院;同济大学材料科学与工程学院;
【基金】：中国博士后科学基金项目(2015T80449) 国家自然科学基金项目(51608383) 河南省重点科技攻关项目(152102310027) 高层次人才科研启动项目(ZX2013016)
【分类号】：TU528

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