Abstract
In this study, the impact test of two groups of reinforced concrete piers protected by closed‐cell aluminum foam is carried out by using the ultrahigh drop hammer impact test system. The purpose of this study is to explore the impact resistance and protective performance of closed‐cell aluminum foam under the impact load on the concrete bridge pier after replacing the ordinary reinforcement with stainless steel reinforcement. The study results show that the impact force is related to the overall stiffness of the specimen, as well as to the failure mode. When the impact velocity is less than 1.42 m/s, the closed‐cell aluminum foam is in an elastic or yielding stage. The change rate of impact force (231 and 97.5, respectively), tip displacement (33.5 and 18, respectively), and ultrasonic damage rate of the concrete in the two groups of specimen is relatively small, while the change rate of the two groups of specimen remains approximately consistent. In addition, when the impact is greater than 1.42 m/s and the closed‐cell aluminum foam is in the densification stage, the change rate of the impact force (increase from 231 to 819 and from 97.5 to 984.5), the tip displacement (increase from 33.5 to 67 and from 18 to 62), and ultrasonic damage rate of concrete are larger, which results in an increase in the dynamic response of the structure.
Highlights
With the development of transportation industry, traffic accidents, such as ship collision with bridge piers, car collision with guardrails, and superhigh vehicle collision with pedestrian overpasses, occur frequently, resulting in significant economic losses [1,2,3]
Wang considered the influence of axial force on the lateral impact resistance test of reinforced concrete (RC) columns, and the results showed that the shear failure and bending failure of RC columns may occur under the action of lateral impact load, while the bending failure tends to occur with the increase of axial compression ratio [11]
Li et al [12] used finite element method analysis ANYSYS/LS-DYNA to study the dynamic response of reinforced concrete columns under the impact of rigid sphere, and the results showed that it is reasonable and effective to use the bond-slip separate model to simulate the dynamic response of reinforced concrete columns; Zhou and Zhang [13, 14]studied the impact performance test of a stainless steel reinforced concrete pier, via which the maximum impact force of the pier specimen was determined. e test results showed that the stainless steel
Summary
With the development of transportation industry, traffic accidents, such as ship collision with bridge piers, car collision with guardrails, and superhigh vehicle collision with pedestrian overpasses, occur frequently, resulting in significant economic losses [1,2,3]. Due to the strong deformation and energy absorption characteristics of closed-cell aluminum foam, in many cases aluminum foam is introduced to the field of impact resistance of bridge piers as an energy dissipation buffer material, and the dynamic response of aluminum foam to the protection of bridge piers under impact load is studied and analyzed so as to reveal the energy dissipation buffering mechanism of aluminum foam. Zhang et al [28] carried out a drop hammer loading test on the lateral impact resistance of RC bridge pier model and analyzed the influence of the buffer device on the dynamic response of the specimen. There have been few reports on the use of closed-cell aluminum foam as an energy absorbing material to protect reinforced concrete bridge piers in combination with the structural response speed. Taking the engineering application of stainless steel reinforced concrete piers of the Hong Kong-Zhuhai-Macao Bridge as the research background, the present paper adopts the domestic advanced ultrahigh dropping hammer impact test system, uses closed-cell aluminum foam as a pier protection device, carries out horizontal impact tests on the concrete piers after equal-strength replacement with stainless steel reinforcement protected by the closed-cell aluminum foam, and studies the influence of the closed-cell aluminum foam on the impact damage of concrete piers after equal-strength replacement with stainless steel reinforcement under the effect of horizontal impact loading
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