Study on the mechanical behavior and reinforcement ratio of eccentrically loaded coral aggregate concrete short columns reinforced with CFRP bar

doi:10.19936/j.cnki.2096-8000.20250228.001

Abstract

Abstract: To study the effects of longitudinal reinforcement ratio and eccentricity on the mechanical behavior of eccentrically loaded coral aggregate concrete short columns reinforced with carbon fiber composite (CFRP) bars, tests were carried out on 9 CFRP-coral concrete short columns and 3 plain coral concrete short columns. The effects of eccentricity (15 mm, 30 mm, 45 mm) and longitudinal reinforcement ratio (2.09%, 3.01%, 4.10%) on the cracking load, ultimate load, CFRP longitudinal reinforcement stress and coral concrete stress were analyzed and discussed, respectively. The results show that all specimens are failed by the crush of concrete on the compression side. The cracks of coral concrete are restricted effectively due to the increase of longitudinal reinforcement ratio, and the cracking load, ultimate load and ductility of the specimens are also increased accordingly. The utilization rate of the strength of CFRP longitudinal bars is relatively low, the maximum stress is only 95.78 MPa, which is about 21.28% of that of the ultimate compressive strength of CFRP reinforcement. Based on the relevant theories of reinforcement ratio for flexural members, calculation methods of longitudinal reinforcement ratio for CFRP-coral concrete columns were put forward, and the values of minimum and maximum reinforcement ratio for the specimens were modified, accordingly, reasonable suggestions were proposed to practical engineering application.

Key words: CFRP bar, coral aggregate concrete, short column, eccentric, reinforcement ratio, composites

CLC Number:

TB332

GUAN Jiwen, WANG Yumei, WEI Lilan, KONG Defu, CHEN Hua, XIONG Chaohua. Study on the mechanical behavior and reinforcement ratio of eccentrically loaded coral aggregate concrete short columns reinforced with CFRP bar[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(2): 1-11.

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