Restoring force model of lattice steel reinforced concrete column with core constraints

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (13) : 306-313.

ZHOU Chunheng1,2, CHEN Zongping2,3

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Abstract

Here, to study the restoring force model of lattice steel reinforced core-confined concrete (LSRCC), low cyclic repeated loading tests were conducted on 8 specimens of LSRCC to obtain their skeleton curves and hysteretic curves. Their hysteretic characteristics were analyzed. Based on characteristics of skeleton curves and hysteretic curves, the constraint effect of section steel and spiral stirrup was quantified in calculating model characteristic parameters of elastoplastic stiffness, softening stiffness and unloading stiffness. The skeleton curve model and restoring force model of LSRCC considering composite constraint action of section steel and spiral stirrup were established. The results showed that hysteretic characteristics of LSRCC are mainly affected by axial compression ratio, section type, stirrup ratio of spiral stirrup and indirect steel ratio of section steel; the proposed three-fold line skeleton curve model agrees better with the measured skeleton curve; the proposed fixed point orientation restoring force model also agrees better with the measured hysteretic curve, and it can reflect effects of different axial compression ratios and composite constraint effect on hysteretic characteristics; the results can provide a reference for elastic-plastic seismic response analysis of the structure.

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lattice steel reinforced core-confined concrete (LSRCC) / composite constraint / hysteretic characteristics / skeleton curve / restoring force model

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ZHOU Chunheng1,2, CHEN Zongping2,3. Restoring force model of lattice steel reinforced concrete column with core constraints[J]. Journal of Vibration and Shock, 2021, 40(13): 306-313

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