Impact resistance of RC beams under different combinations of mass and velocity: mesoscale numerical analysis
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(2020) 20:119
ORIGINAL ARTICLE
Impact resistance of RC beams under different combinations of mass and velocity: mesoscale numerical analysis Liu Jin1 · Yuchang Lan1 · Renbo Zhang2 · Xiuli Du1 Received: 27 May 2020 / Revised: 19 September 2020 / Accepted: 21 September 2020 © Wroclaw University of Science and Technology 2020
Abstract The concrete structures under impact loading duress may be destroyed within an extremely short period of time. The importance and complexity of exploration on the impact resistance of concrete members make this area still open for discussion. In the present study, a 3-D mesoscale numerical model was established to investigate the effect of the combination of impact mass and velocity on the mechanical behavior of reinforced concrete (RC) beams subjected to impact loadings. Heterogeneity of concrete and strain rate effects of concrete and steel bars were taken into account. Furthermore, nonlinear interaction between the concrete and steel bars was considered herein. Results from macroscale and mesoscale simulation were compared with the available physical tests, indicating that the mesoscale numerical model can better represent the influence of heterogeneity of concrete on the mechanical behavior of RC beams. Five different impact energy levels were involved to study the effect of the combination of impact mass and velocity on the impact resistance of RC beams. At last, the residual bearing capacity and natural frequency of impacted RC beams were numerically calculated and their relationship was discussed. It is indicated that the deformation of RC beams is influenced strongly by the impulse, which increases with the increasing impact mass at identical impact energy. Besides, the failure mode of RC beams turns from shear-dominant failure mode to bending shear failure mode with the increase of impact mass, accompanied by the increase of energy dissipation of steel bars and the whole member. Despite this, in the present work, the combination of the impact mass and velocity had little influence on the damage extent (based on the performance) of the RC beams. Moreover, an empirical relationship between the residual bearing capacity and the natural frequency of the impacted RC beams was established as a rough reference for damage evaluation in engineering practice. Keywords RC beam · Impact mass · Impact velocity · Mesoscale simulation · Natural frequency
1 Introduction
* Renbo Zhang [email protected] Liu Jin [email protected] Yuchang Lan [email protected] Xiuli Du [email protected] 1
Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China
Department of Civil Engineering, Tsinghua University, Beijing 100084, China
2
In recent years, considerable accidents, such as the gas explosion in residential areas have been widely reported [1]. Besides the blast wave, the buildings are always threatened by secondary actions, i.e., the impact by the falling structural components or fragments, resultin
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