- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
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| Citation: | SHAO Changjiang, QI Qiming, WEI Wang, XIAO Zhenghao, HE Junming, RAO Gang. Experimental Study on Ductile Seismic Performance of Rectangular Hollow Concrete Columns[J]. Journal of Southwest Jiaotong University, 2022, 57(1): 129-138, 157. doi: 10.3969/j.issn.0258-2724.20200092
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To deeply explore the seismic damage mechanism and evaluate the ductile capacity of hollow RC columns, square and rectangular hollow specimens with different aspect ratios, longitudinal rebar ratios, and stirrup ratios were tested under quasi-static loading. The crack distribution and damage state were observed. The hysteretic behavior, curvature and displacement ductility were analyzed. According to the experimental data in literature, applicability of the existing plastic hinge formulas to estimate the tip displacement capacity of hollow columns was discussed. The results show that all hollow specimens suffer flexural failure with ductility factor over 5.0, resulting in excellent seismic performance. The shear performance of hollow columns is weaker than that of solid members with the same external size and aspect ratio. The lateral bearing capacity and ultimate displacement can be properly improved by increasing longitudinal rebar ratio. However, the longitudinal steel and stirrup amount exert vague effects on the displacement ductility factor of hollow columns with low axial load ratio. The plastic hinge length of hollow columns increases with increased aspect ratio, longitudinal rebar strength/diameter, or axial load ratio, but decreases with the increment in concrete strength. The influence of stirrup on the plastic hinge is not obvious. The relative errors between the test and calculation of Mander, Sun and JRA models are less than 5%. Mander supplies the best result, which can be used to evaluate the equivalent plastic hinge length of a hollow column. The Paulay-Priestley model, adopted in many codes, overestimates the length of the plastic hinge of hollow members, leading to unsafe seismic design.
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