大尺寸CFRP约束混凝土方柱落锤动态冲击试验研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (20) : 90-97.

论文

单波1，刘波1，肖岩1,2， GIORGIO Monti 1,3

作者信息 +

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

Author information +

文章历史 +

摘要

采用FRP增强的混凝土柱在使用过程中，可能受到轴向冲击荷载作用，但目前这方面的研究基本处于空白。通过对7组21个大尺寸 CFRP约束混凝土方柱进行落锤轴向冲击试验，研究倒角半径r对约束柱抗冲击性能的影响。试验获取了锤头冲击力时程曲线、压缩变形时程曲线、FRP表面关键点的应变时程曲线和整个破坏过程的高速影像等信息。试验结果表明， CFRP约束混凝土方柱的破坏是由试件中部倒角位置处的CFRP被拉断所导致的，试件的破坏现象与倒角半径r有关；倒角半径r对约束柱的冲击性能有显著影响，r越大，冲击应力峰值和能量密度也越大；CFRP约束混凝土方柱的动力增大系数(DIF)随倒角半径比rc的增大而减小，基本成线性关系，在1.23~1.82之间。

Abstract

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.

导出引用

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[J]. Journal of Vibration and Shock, 2016, 35(20): 90-97

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