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Experiment and Simulation Study on the Dynamic Response of RC Slab under Impact Loading
Shock and Vibration ( IF 1.6 ) Pub Date : 2021-11-28 , DOI: 10.1155/2021/7127793
Yue Wang 1, 2, 3 , Jun Liu 1, 2, 3 , Zhimin Xiao 1, 2, 3 , Futian Zhao 1, 2, 3 , Yi Cheng 1, 2, 3
Affiliation  

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.

中文翻译:

冲击荷载作用下钢筋混凝土板动力响应的试验与仿真研究

钢筋混凝土(RC)板是土木建筑和防护工程中的重要组成部分,其在冲击载荷下的动力响应是一个复杂的力学问题,尤其是对于两个或多个连续冲击载荷。在本文中,进行了一系列落锤冲击试验,以研究 RC 板在连续两次冲击下的动态响应。记录了冲击力的时间历程和板坯表面的破坏特性。此外,还讨论了四个影响因素,包括板厚、配筋率、冲击位置和落锤高度。此外,建立了基于有限元法(FEM)的三维数值模型,以扩展对钢筋混凝土板受约束力、挠度和竖向应力的研究。结果表明,增加板厚和配筋率可以提高钢筋混凝土板的抗冲击性能。冲击点位置和落锤高度对钢筋混凝土板的动力响应影响很大。此外,RC板在二次冲击下会出现更明显的损伤,但动力响应变弱。可能是因为第一次冲击引起的混凝土局部损坏会削弱振动的传播。
更新日期:2021-11-28
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