Experimental and numerical study on the blast resistance of C-shaped doubled steel concrete slab (C-DSCS) with L-shaped connectors

Abstract

This study aims to explore the blast resistance of C-shaped doubled steel concrete slabs (C-DSCS) with L-shaped connectors. These slabs utilize the superior compressive strength of concrete and enhance the load-bearing capacity by following a load path similar to that of arch structures. The dynamic behaviors and energy dissipation of the C-DSCS with L-shaped connectors were experimentally and numerically investigated under near-field explosion. Firstly, the pressure–time curve of the explosion was obtained by the pressure sensor in the test. Then, a finite element model (FEM) of the C-DSCS specimen was established through the LBE algorithm, and the accuracy of the finite element model was experimentally validated. Finally, parametric analyses was carried out to investigate the steel plate thickness, explosion distance and spacing of connectors on the dynamic response of the C-DSCS. The results indicated that the C-DSCS specimen had good integrity without failing or severe destruction under the explosion. A small number of oblique cracks appeared in the concrete infill near the free side of L-shaped connectors, which can effectively exert the compressive strength of the concrete. Concrete and bottom steel plate were the main energy-consuming component for C-DSCS and dissipated more than 78% of the explosive energy. In addition, L-shaped connectors also played a certain role in absorbing explosive energy, which can effectively reduce the maximum deflection of the specimens by decreasing the spacing of connectors. This paper provides a basis for theoretical analysis of dynamic response of C-DSCS subjected to close-in explosion, laying a foundation for further design methods.