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.
Highlights
Security incidents and military strikes, as one of the most important materials used in contemporary engineering structures, reinforced concrete (RC) components may be subjected to impact loads such as explosion and falling rock collision, resulting in bending failure, bending shear failure, and even brittle shear failure. e damage to some key RC components can cause instability or even collapse of the entire structure. e dynamic response of the RC components under the impact load is affected by impact energy, reinforcement ratio, component size, impact position, and other factors, which is a complex mechanical process
With the continuous development of test technology and computer simulation, scholars have carried out a large number of numerical simulation studies on the dynamic response of RC members under impact loading
A series of drop hammer tests are conducted and four groups of finite element method (FEM) model for RC slabs are established using LS-DYNA to study the dynamic response of the RC slabs under two successive impacts. e effect of slab thickness, reinforcement ratio, impact location, and drop hammer height on the impact resistance of the RC slab is investigated
Summary
Security incidents and military strikes, as one of the most important materials used in contemporary engineering structures, reinforced concrete (RC) components may be subjected to impact loads such as explosion and falling rock collision, resulting in bending failure, bending shear failure, and even brittle shear failure. e damage to some key RC components can cause instability or even collapse of the entire structure. e dynamic response of the RC components under the impact load is affected by impact energy, reinforcement ratio, component size, impact position, and other factors, which is a complex mechanical process. The research methods of dynamic response of the RC components under the impact load mainly include theoretical method, experimental method, and numerical simulation method. With the continuous development of test technology and computer simulation, scholars have carried out a large number of numerical simulation studies on the dynamic response of RC members under impact loading. Zhao [24] established a 3D FEM model of the previous test, and the effects of impact velocity, impact mass, and span-depth ratio on the impact response of the RC beams were studied. A series of drop hammer tests are conducted and four groups of FEM model for RC slabs are established using LS-DYNA to study the dynamic response of the RC slabs under two successive impacts. A series of drop hammer tests are conducted and four groups of FEM model for RC slabs are established using LS-DYNA to study the dynamic response of the RC slabs under two successive impacts. e effect of slab thickness, reinforcement ratio, impact location, and drop hammer height on the impact resistance of the RC slab is investigated
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