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为了研究钢筋混凝土核心筒的破坏机理和在不同参数下的抗震性能,该文采用基于性能结构分析软件PERFORM-3D,对钢筋混凝土核心筒在静力水平荷载作用下的受力性能进行了三维非线性数值模拟,通过与模型试验结果的对比,验证了所选弹塑性模型分析钢筋混凝土核心筒抗震性能的有效性和准确性。在此基础上,对混凝土核心筒进行参数分析,系统分析了轴压比、连梁跨高比、连梁纵筋配筋率、试件高宽比等不同参数对钢筋混凝土核心筒抗震性能的影响规律。计算结果表明,混凝土核心筒承载力随着轴压比的增大而提高,但当试验轴压比达到0.4后,承载力出现降低,变形能力随轴压比增大而降低;随着高宽比的增大,核心筒承载力降低,变形能力提高,同时,试件破坏模式也发生变化;增大连梁刚度较大地提高了试件承载力,但也严重降低了试件的延性变形性能。此外,通过核心筒试件的弹塑性损伤分析,得到核心筒试件损伤发展顺序以及各构件屈服情况。
In order to study the failure mechanism of RC core barrel and the seismic performance under different parameters, this paper uses PERFORM-3D based on the performance analysis software to simulate the stress performance of CFR core tube under static horizontal load. By comparing with the model test results, the validity and accuracy of the proposed elasto-plastic model for the analysis of seismic behavior of reinforced concrete core tube are validated by linear numerical simulation. On this basis, the parameters of the concrete core tube are analyzed and the influences of different parameters such as axial compression ratio, span ratio of connecting beam, longitudinal reinforcement ratio of connecting beam, specimen aspect ratio, etc. On the seismic performance of reinforced concrete core tube Affect the law. The calculation results show that the bearing capacity of concrete core increases with the increase of axial compression ratio, but when the axial compression ratio reaches 0.4, the bearing capacity decreases and the deformation capacity decreases with the increase of axial compression ratio. The bearing capacity of the core tube is reduced and the deformation capacity is improved. At the same time, the failure mode of the specimen also changes. Increasing the rigidity of the connecting beam greatly increases the bearing capacity of the specimen, but also greatly reduces the ductility deformation of the specimen. In addition, through the analysis of the elasto-plastic damage of the core tube specimen, the order of the damage development of the core tube specimen and the yield of each component are obtained.