A study on the restoring force model of composite torsional solid web steel reinforced concrete columns

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (8) : 69-78.

CHEN Yuliang1,2，LI Hao1，CHEN Zongping1,3

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Abstract

In order to study the restoring force model of solid-web steel reinforced concrete columns under the effect of composite torsion, 9 solid-web SRC columns were tested by quasi-static loading test by considering the three main factors of torsion bending ratio, axial compression ratio and shear span ratio. The torque-torsion angle skeleton curves and the hysteretic curves were obtained, and the influence laws of the torsion hysteretic performance under different torsion bending ratios, axial compression ratios and shear span ratios were analyzed. Based on the experimental torque-torsion angle skeleton curves and the hysteretic curves, the trilinear model of skeleton curve with the yield point, peak point and failure point as characteristic point was proposed, while the hysteretic laws were simplified; the restoring force model under composite torsion of solid-web SRC column was established. The results show that with the increase of torsion bending ratio, the failure mode of specimens changed from bending failure to torsional failure. The torsion resistance of solid-web SRC columns is most influenced by torsion bending ratio. The torque-torsion angle skeleton curves’ calculation results under different torsion bending ratios, axial compression ratios and shear span ratios are in good agreement with the experimental ones. The proposed torsional restoring force model considering the influence of unloading stiffness degradation also preferably predicts the torsional hysteretic curves of solid-web SRC columns. The results can provide a reference for elastic-plastic seismic response analysis of such structures under complex stress states.

Key words

solid web steel reinforced concrete；composite torsion；hysteretic curve；skeleton curve / torsional restoring force model

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CHEN Yuliang1,2，LI Hao1，CHEN Zongping1,3. A study on the restoring force model of composite torsional solid web steel reinforced concrete columns[J]. Journal of Vibration and Shock, 2023, 42(8): 69-78

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