Experimental research on large-scale square columns confined with wrapped CFRP under drop hammer impact load
Shan Bo1, Liu Bo1, Xiao Yan1,2, GIORGIO Monti ,3
1. China Ministry of Education Key Laboratory of Building Safety and Energy Efficiency, Hunan University, Changsha 410082,China;
2.Department of Civil Engineering, University of Southern California, Los Angeles CA90089, USA;
3. University of Rome Sapienza, School of Architecture, Rome, 00197, Italy
Concrete column confined with wrapped FRP may be suffered axial impact loading, but the mechanical performance under axial impact of this composite structure is the blank field of research. In this paper, seven groups of CFRP confined large-scale square columns with different corner radius, three specimens in each group, were conducted drop hammer axial impact tests. Corner radius r is the main test parameter. Tests obtained the impact force-time history curves, compressive deformation-time history curves, strain-time history curves of key points on CFRP jacket and the high-speed photography during failure process. The test results show that the fracture of CFRP jacket in the chamfer zone leads to failure of test columns and the failure characteristics of specimens is related to corner radius r. Impact strength and energy density of confined columns increase obviously with corner radius r increasing. The relationship between dynamic increase factor (DIF) and corner radius ratio rc almost presents a linear decrease relation and the value varies from 1.23 to 1.82.
单波1，刘波1，肖岩1,2， GIORGIO Monti 1,3. 大尺寸CFRP约束混凝土方柱落锤动态冲击试验研究[J]. 振动与冲击, 2016, 35(20): 90-97.
Shan Bo1, Liu Bo1, Xiao Yan1,2,,GIORGIO Monti,3. Experimental research on large-scale square columns confined with wrapped CFRP under drop hammer impact load. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(20): 90-97.
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