Test study on hysteresis performance of welded stud steel reinforced concrete column under compression-torsion composite stress

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (17) : 123-131.

CHEN Yuliang1,2,3, LIU Kaige1, JI Yunpeng1,2, YE Peihuan1,2#br#

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Abstract

In order to reveal the torsional behavior of Stud welding steel reinforced concrete (SSRC) columns, six types of stud arrangements (flange, web, symmetry, interleaving, single and double, X-shaped) were proposed. Through the compression-torsion low-cycle repeated loading test of seven SSRC columns and one SRC column, the performance of SSRC column under combined compression-torsion loading was studied. The failure modes of welded stud steel reinforced concrete columns under combined compression-torsion loading were observed in the test, and the torsional failure mechanism was revealed. The influence of axial compression ratio and stud arrangement on the torque-torsion angle hysteresis curve, skeleton curve, stiffness degradation, torsional energy dissipation, and ductility of each specimen were compared and analyzed. The results show that under the combined stress state of compression and torsion, the hysteresis curves of torque–torsion angle are in “S” shapes with obvious pinching, and the inclination angle of the torsion crack is between 45° and 60°, which increases gradually with the increase of axial compression ratio. Torsional cracking of specimen can be effectively delayed by six types of stud arrangement, and the torsional bearing capacity of SSRC columns after welding studs on the web increases by 11.9 %. Increasing the axial compression ratio can effectively improve the initial torsional stiffness and energy dissipation capacity of SSRC columns, but it will reduce their torsional deformation capacity. The torsional cumulative energy dissipation of SSRC columns increased by 16.4 %, 11.8 %, and 10.2 %, respectively, when the studs were arranged symmetrically, in webs, and X-shaped. A comprehensive comparison of various indicators found that the stud symmetrical arrangement of steel reinforced concrete structure compression-torsion behavior had the best modification effect.

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compression-torsion behavior / welded stud / stud arrangement / steel reinforced concrete column / hysteretic behavior

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CHEN Yuliang1, 2, 3, LIU Kaige1, JI Yunpeng1, 2, YE Peihuan1, 2. Test study on hysteresis performance of welded stud steel reinforced concrete column under compression-torsion composite stress[J]. Journal of Vibration and Shock, 2024, 43(17): 123-131

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