Cyclic behavior of partially precast steel reinforced concrete short columns: Experiment and theoretical analysis
Cyclic behavior of partially precast steel reinforced concrete short columns: Experiment and theoretical analysis
复制标题
部分预制钢筋混凝土短柱的循环性能：实验与理论分析
DOI：
10.1016/j.engstruct.2019.109658
复制
发表时间：
2019-11-15
影响因子：
5.5
通讯作者：
Yu, Yunlong
中科院分区：
文献类型：
--
作者：
Xue, Yicong;Yang, Yong;Yu, Yunlong
本文介绍了两个创新的预制型钢混凝土柱。部分预制型钢混凝土(PPSRC)柱由预制外部和现浇内部组成，空心预制型钢混凝土(HPSRC)柱保持柱芯中空，以进一步减轻柱的自重。本文通过对6根PPSRC柱和4根高宽比较低的HPSRC柱在反复荷载和恒定轴压作用下的破坏模式、滞回特性、刚度退化、耗能能力和位移延性等方面的研究，探讨了PPSRC柱和HPSRC柱的循环性能。同时，重点研究了截面形状、轴压、纵横向配筋率以及内部混凝土强度等因素对加固效果的影响。试验结果表明，根据纵向配筋率的不同，柱试件出现弯剪破坏模式和剪切临界破坏模式，总体上，PPSRC柱表现出比HPSRC柱更好的循环性能。在其他参数相同的情况下，配箍率越高，轴压越小，耗能能力越好，刚度退化越大，位移延性越大，且随着混凝土内部强度、配箍率和轴压的增大，其承载能力也随之提高。在试验结果的基础上，建立了用于计算试件抗剪承载力的分析模型，并利用66个型钢混凝土抗剪临界试件的试验数据库验证了该模型的有效性。
Two innovative precast steel reinforced concrete columns are presented in this paper. The partially precast steel reinforced concrete (PPSRC) column was composed of a precast outer part and a cast-in-place inner part, and the hollow precast steel reinforced concrete (HPSRC) column kept the column core hollow to further reduce the column deadweight. In this paper, six PPSRC column specimens and four HPSRC column specimens with low aspect ratios were subjected to reversal cyclic load and constant axial compression to explore the cyclic behavior, which was evaluated by the failure mode, hysteresis characteristic, stiffness degradation, energy dissipation capacity and displacement ductility. Meanwhile, the effects of section shape, axial compression, ratios of longitudinal and transverse reinforcement and concrete strength of the inner part were critically investigated. The test results indicated that the column specimens suffered flexural-shear failure mode and shear-critical failure mode according to different ratios of longitudinal reinforcement, and, in general, the PPSRC columns exhibited more satisfactory cyclic behavior than that of the HPSRC columns. When the other parameters were the same, a higher stirrup ratio and lower axial compression led to a more satisfactory energy dissipation capacity, stiffness degradation and higher displacement ductility, and the load-bearing capacity increased with increasing inner concrete strength, stirrup ratio and axial compression. Based on the test results, an analytical model was established to calculate the shear capacity of test specimens, and the proposed model was verified to be valid using a test database consisting of 66 shear-critical SRC column specimens.