Effects of axial compression ratio on aseismic performance of RC beam-column joint under rapid loading

YANG Tiange1, FAN Guoxi1, WANG Ye1, WANG Debin2, SHANG Huaishuai3

Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (11) : 271-278.

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (11) : 271-278.

Effects of axial compression ratio on aseismic performance of RC beam-column joint under rapid loading

  • YANG Tiange1, FAN Guoxi1, WANG Ye1,   WANG Debin2,    SHANG Huaishuai3
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Abstract

At present, most beam-column joint’s aseismic performance studies are quasi-static test ones, dynamic test studies are less. Here, rapid loading tests were conducted for 4 beam-column joint combination specimens to study the effects of axial compression ratio on aseismic performance of beam-column joint under rapid loading. In addition, based on the softened strut-and-tie model, Coulomb failure criterion, Mohr’s circle theory and the mechanical model of joint combination, the calculation model of concrete shear strength was derived under the shear-compression composite stress state. The study showed that the softened strut-and-tie model can be used to predict the anti-shear load-bearing ability and failure modes of joint combination; the calculation model of concrete shear strength can be used to predict effect laws of axial compression ratio on anti-shear load-bearing ability of joint combination considering material strain rate effect; joint combinations have same failure modes and crack types under different axial compression ratios, however, with increase in axial compression ratio, number of cracks, shear deformation and angle between oblique crack and vertical axial force in joint core zone gradually decrease, transfers of joint combination’s serious damage parts happen; forward loading’s loop line stiffness is always larger than reverse loading’s one under the same displacement level; with increase in axial compression ratio, anti-shear load-bearing ability of joint combination increases, but the effect is not obvious; increase in axial compression ratio is beneficial to energy dissipation of joint combination.

Key words

beam-column joint / loading speed / axial compression ratio / failure mode / bearing capacity

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YANG Tiange1, FAN Guoxi1, WANG Ye1, WANG Debin2, SHANG Huaishuai3. Effects of axial compression ratio on aseismic performance of RC beam-column joint under rapid loading[J]. Journal of Vibration and Shock, 2019, 38(11): 271-278

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