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设计了5个钢筋混凝土核心筒试件并进行了拟静力试验,对其开裂过程、屈服顺序、滞回性能、耗能能力、承载力、延性、变形能力、刚度退化、截面应变及剪力滞后等进行研究,得到了试件开裂、屈服直至破坏时的荷载,分析了核心筒的破坏机理和较大塑性变形区域受力情况,研究了试件高宽比、连梁纵筋配筋率、连梁跨高比及加载角度等因素对核心筒的破坏模式、承载力、延性、耗能能力和剪力滞后的影响。研究结果表明,高宽比对核心筒结构的承载力和变形性能有较大影响,并决定着核心筒的破坏模式;过度增大连梁纵筋配筋率在提高侧向承载力的同时降低了试件的延性;增大连梁跨高比可以显著提高核心筒的侧向刚度和承载力,但也严重影响了试件开裂后的性能,变形能力较差;不同加载角度的侧向力改变了整个核心筒的受力承载模式,各墙肢积极参与受力,空间效应明显,增大加载角度仍可获得较好的滞回性能。
Five specimens of reinforced concrete core tube were designed and subjected to quasi-static tests. The cracking process, yield order, hysteretic behavior, energy dissipation capacity, bearing capacity, ductility, deformation capacity, stiffness degradation, Hysteresis and so on. The cracking load and the load at yielding to failure were obtained. The failure mechanism of the core tube and the stress in the area of large plastic deformation were analyzed. The effects of the aspect ratio of the specimen, , The effect of load-bearing capacity, ductility, energy dissipation capacity and shear lag on the failure of the core tube due to factors such as span-to-height ratio of beam and loading angle. The results show that the aspect ratio has a great influence on the bearing capacity and deformation performance of the core tube structure and determines the failure mode of the core tube. Too excessive increase of the longitudinal reinforcement ratio can reduce the lateral bearing capacity The ductility of the specimen increases; the cross-beam height-ratio increases the lateral stiffness and bearing capacity of the core tube significantly, but also severely affects the performance of specimens after cracking, the deformation ability is poor; the lateral force at different loading angles changes Throughout the core tube load bearing mode, each wall and limb actively involved in the force, the space effect is obvious, increasing the loading angle can still get better hysteretic performance.