低周反复荷载下型钢再生混凝土框架中节点抗震性能试验研究

发布时间：2018-03-22 08:06

本文选题：型钢混凝土结构　切入点：再生混凝土　出处：《土木工程学报》2014年10期 　论文类型：期刊论文

【摘要】：为研究型钢再生混凝土框架中节点的破坏特征和抗震性能,进行4榀粗骨料取代率分别为0%、30%、70%、100%的1∶2.5模型试件的低周反复加载试验,观察其破坏形态和受力特点,对框架中节点的荷载-位移滞回曲线、骨架曲线、承载能力、强度退化、刚度退化、层间位移角、延性以及耗能能力等力学性能进行分析研究。结果表明:型钢再生混凝土框架中节点的典型破坏形态是节点核心区剪切斜压破坏;荷载-位移滞回曲线饱满,位移延性系数介于3.95~4.88;弹塑性极限位移角约为1/19~1/26;破坏时节点的等效黏滞阻尼系数介于0.322~0.335;随着再生粗骨料取代率的增加,型钢再生混凝土框架中节点的抗剪承载力和耗能能力有所降低,延性减小。但是相对于普通型钢混凝土框架中节点而言抗震性能降低不大。
[Abstract]:In order to study the failure characteristics and seismic behavior of joints in steel reinforced recycled concrete frame, the low cycle repeated loading tests of 1: 2.5 model specimens with a replacement ratio of 0 30% coarse aggregate and 100% coarse aggregate were carried out, and the failure patterns and mechanical characteristics were observed. The load-displacement hysteretic curve, skeleton curve, bearing capacity, strength degradation, stiffness degradation, interstory displacement angle, The results show that the typical failure mode of joints in the steel reinforced concrete frame is shear baroclinic failure in the core zone of the joints, the load-displacement hysteretic curve is full, and the mechanical properties such as ductility and energy dissipation capacity are analyzed and studied. The displacement ductility coefficient is between 3.95 and 4.88; the elastic-plastic limit displacement angle is about 1 / 19 / 1 / 26; the equivalent viscous damping coefficient of the joints is between 0.322 and 0.335; with the increase of the replacement rate of regenerated coarse aggregate, The shear capacity and energy dissipation capacity of joints in steel reinforced concrete frame are decreased and the ductility is reduced, but the seismic behavior of joints in steel reinforced concrete frames is not much lower than that in normal steel reinforced concrete frames.
【作者单位】：西安建筑科技大学;
【基金】：国家自然科学基金(51178384) 陕西省留学人员科技活动择优资助项目(陕外专发[2010]26号) 住房和城乡建设部科学技术项目(2012-K2-12) 陕西省教育厅科研计划项目(12JK0902) 教育部创新团队发展计划(IRT13089)
【分类号】：TU398.9;TU317.1

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