Punching behaviors of steel–concrete–steel sandwich panels with interlocked angle connectors: Experimental and analytical studies: Fid-Bau Portal

Punching behaviors of steel–concrete–steel sandwich panels with interlocked angle connectors: Experimental and analytical studies

Zhou, Zhaohui / Wang, Yonghui / Zhai, Ximei / Zhou, Hongyuan / Sun, Menghan

Abstract

Abstract This paper presents a new steel–concrete–steel sandwich panel with interlocked angle connectors (SCSP-IACs), and its punching performances were experimentally and analytically studied. Nine SCSP-IACs were fabricated and tested under the out-of-plane patch loads. Test results showed that SCSP-IACs exhibited two types of load–deflection (P– $δ$ ) responses with the variation of spacing of IACs (S), and increasing S also showed significantly negative influences on their punching behaviors. Two peak resistances were observed from the P– $δ$ curves of all SCSP-IACs, and the first and second peak resistances ( $P_{u1}$ and $P_{u2}$ ) corresponded to the punching shear failure of the concrete core and top steel faceplate, respectively. The punching shear resistance of SCSP-IACs was found to be evidently improved with the increase of steel faceplate thickness ( $t_{s}$ ) and concrete core thickness (d), while increasing S led to the decrease of punching shear resistance of SCSP-IACs. Moreover, the interlocking bolt in IACs exhibited little influence on the punching behaviors of SCSP-IACs. Finally, analytical models were proposed for calculating the punching shear resistance of SCSP-IACs, and their accuracies were also verified with test data.

Highlights • A novel steel–concrete–steel sandwich panel with interlocked angle connectors (SCSP-IACs) was proposed. • The influences of variant parameters on punching behaviors of SCSP-IACs were studied. • The punching shear failure criterion of the SCSSP-IACs under out-of-plane patch loads was revealed. • Analytical models were developed to predict the punching shear resistance of SCSP-IACs.