Seismic behavior of full-scale steel reinforced recycled concrete columns under high axial compression ratio
Seismic behavior of full-scale steel reinforced recycled concrete columns under high axial compression ratio
复制标题
高轴压比下全尺寸钢骨再生混凝土柱抗震性能
DOI：
10.1016/j.istruc.2020.12.037
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发表时间：
2021
期刊：
影响因子：
4.1
通讯作者：
Guo Yanli
中科院分区：
文献类型：
--
作者：
Dong Hongying;Li Yanna;Cao Wanlin;Guo Yanli
为促进再生混凝土在构件中的应用，研究了再生粗骨料取代率和内配筋对高强再生混凝土高轴压比柱抗震性能的影响。对6根截面为600 mm × 600 mm的型钢再生混凝土柱和钢筋再生混凝土柱进行了低周反复荷载试验。结果表明，高轴压比下的高强钢筋混凝土柱具有可靠的抗震性能。内配筋可以提高钢筋混凝土柱的抗震性能，特别是对于高钢筋混凝土置换率的试件。再生混凝土取代率对型钢混凝土柱的承载力和延性影响不明显，但对钢筋混凝土柱的承载力和耗能略有降低。当试件破坏时，受压区的钢筋和翼缘截面屈服，而受拉区的钢筋接近屈服。根据平面假设，考虑钢筋和混凝土的约束作用，计算了裂缝荷载、屈服荷载和峰值荷载，计算值与试验值吻合较好。该研究为高强再生混凝土柱在实际工程中的应用提供了参考。
In order to promote the application of recycled concrete in structural members, the effect of recycled coarse aggregate (RCA) replacement ratio and inner steel on seismic performance of high-strength recycled concrete columns under high axial compression ratio was investigated. Low frequency cyclic loading tests on 6 column specimens, including 3 steel reinforced recycled concrete (SRRC) columns and 3 reinforced recycled concrete (RRC) columns, with a 600 mm × 600 mm cross section were carried out. Results show that high-strength RRC columns under high axial compression ratio have reliable seismic performance. The seismic performance of RRC columns is improved by adding inner steel, especially for specimens with high RCA replacement ratio. The replacement ratio of RCA has no obvious effect on SRRC column bearing capacity and ductility, but for RRC columns, it slightly reduces bearing capacity and energy consumption. When the specimen is damaged, the reinforcement and flange section in the compression zone yields, while the reinforcement in the tension zone approaches yielding. According to the plane assumption and considering the confining effect for the concrete provided by stirrup and steel, the crack load, yield load, and peak load are calculated, and calculated values are in good agreement with experimental values. This study provides a reference for the application of high-strength recycled concrete columns in practical engineering.