Experiment and Simulation Study on the Dynamic Response of RC Slab under Impact Loading

Abstract

Reinforced concrete (RC) slab is an important component in civil construction and protection engineering, and its dynamic response under impact loading is a complex mechanical problem, especially for two or multiple continuous impact loads. In this paper, a series of drop hammer impact tests were carried out to investigate the dynamic response of RC slabs with two successive impacts. The time history of impact force and the failure characteristic of the slab surface were recorded. Moreover, four influence factors, including slab thickness, reinforcement ratio, impact location, and drop hammer height have been discussed. Besides, a 3D numerical model based on the finite element method (FEM) was established to expand the research of constrained force, deflection, and vertical stress of an RC slab. The results show that increasing the slab thickness and reinforcement ratio can improve the impact resistance of an RC slab. The impact point location and drop hammer height have a great influence on the dynamic response of the RC slab. In addition, the RC slab will have more obvious damage under the second impact, but the dynamic response becomes weaker. It may be because of the local damage in the concrete caused by the first impact that would weaken the propagation of vibration.

A comprehensive experimental review of strain rate, size effect, creep and confinement in concrete: Part III

“…Study of RC slab under the impact loading (Wang et al, 2021c) • Various experiments are performed on a concrete slab with two successive impact tests.…”

Anti-Impact Performance Enhancement of Two-Way Spanning Slab through the Implementation of Steel Trussed Bars

“…Diagonal reinforcement arrangements facilitate the uniform propagation of stress waves, thereby subjecting the concrete to considerable dynamic loading during impulsive impacts. Consequently, the susceptibility to damage is diminished compared to control slabs and those employing conventional orientations [38,39,65]. Te implementation of diagonal confgurations in slab reinforcement systems has yielded notable efects on both vertical displacement and stress distribution.…”

“…Tese include shear studs [18], basalt fber-reinforced polymer (FRP) strips [19], hybrid fbers comprising hooked-end steel, polypropylene, and Kevlar [20], high-performance fber-reinforced cementitious composites (HPFRCCs) [21], prestressed concrete [22,23], ferrocement [24], internal anchorage stirrups [25][26][27], Wshaped stirrups [28], truss shear reinforcement [29][30][31], steel plates and slurry-infltrated mat concrete (SIMCON) laminates [32,33], polypropylene fber [33], geogrids [34], and carbon textiles [35]. Increasing the thickness of the slab has demonstrated efcacy in reducing damage and altering failure modes [36], while employing higher-grade concrete has shown some advantages in mitigating slab puncture [37][38][39][40][41].…”

Experimental and Numerical Analysis of Impact Strength of Concrete Slabs

“…Numerical finite element (FE) analysis of RC slabs under drop-weight impact load has been conducted using different material models, such are Riedel-Hiermaier-Thoma -RHT model and Ansys Workbench software package [6], continuous surface cap model and Ansys LS-DYNA software package [7], and concrete damage plasticity model -CDP, available in Abaqus software package [8,9].…”

“…Experimental and numerical research encompassed influence of different parameters on strength of an RC slab under impact load, such are slab thickness, impact location, drop-weight height [7], and reinforcement ratio [7,10]. The semi-empirical formulae for determining local effects of hard missiles have also been proposed [11].…”