Experimental research of the seismic performance of frame columns strengthened with high ductile concrete jacket and analysis of the limitation of axial load ratio
Deng Mingke Zhang Yangxi Chen Shangcheng
Xi’an University of Architecture and Technology, Xi’an 710055, China
Abstract： The reinforced concrete (RC) columns are vulnerable to small eccentric compression failures in severe earthquake when the axial load ratio is at a high level. In order to change the failure modes and improve the seismic performance of the RC columns under high axial load ratio，the high ductile concrete (HDC) jacket was proposed to strengthen the RC columns. Six RC columns were designed and four of them were strengthened with HDC jacket or ferrocement jacket. The influence of strengthening schemes and axial load ratios on the failure modes, hysteresis performance, shear capacity, deformation capacity, energy dissipation capacity and stiffness degradation of the specimens were studied by the low cyclic loading test. The experimental results show that the failure mode of the RC columns was changed from small eccentric compression failure to large eccentric compression failure and the vertical load-carrying capacity were stably maintained when the ultimate displacements were reached. The bearing capacity，ductility and energy dissipation capacity of the RC columns were significantly improved and the stiffness degradation rate was slowed down after strengthening with HDC jackets. The area of the compression zone, the relative compression height and the limitation of the axial load ratio of the columns were obviously increased after strengthening. Besides, the column still exhibited good section deformation capacity.
邓明科 张阳玺 陈尚城. 高延性混凝土加固框架柱抗震性能试验研究及其#br#
轴压比限值分析[J]. 土木工程学报, 2019, 52(2): 22-31.
Deng Mingke Zhang Yangxi Chen Shangcheng. Experimental research of the seismic performance of frame columns strengthened with high ductile concrete jacket and analysis of the limitation of axial load ratio. 土木工程学报, 2019, 52(2): 22-31.
