高温作用后碳纤维布约束混凝土动态力学性能试验研究

doi:10.19936/j.cnki.2096-8000.20250328.004

摘要/Abstract

摘要： 为探究高温及应变率作用对碳纤维布约束混凝土力学性能影响规律,利用马弗炉、伺服压力机及霍普金森压杆(SHPB)对不同温度(25 ℃、200 ℃、400 ℃、600 ℃)作用后三种碳纤维布约束混凝土(素混凝土、高温下碳纤维布约束混凝土、纤维布约束高温混凝土)开展静、动态单轴压缩试验,分析高温、应变率及约束方式对试件峰值应力、动态增强因子(DIF)、韧性及破碎耗能密度影响规律。结果表明:静载作用下200 ℃、400 ℃、600 ℃作用后素混凝土峰值应力降幅为7.25%、19.05%、34.20%,0.5 MPa冲击气压作用下200 ℃、400 ℃、600 ℃作用后素混凝土峰值应力降幅为5.57%、14.66%、29.05%,三种混凝土试件峰值应力均随温度的升高而降低,且碳纤维布高温混凝土峰值应力>高温下碳纤维布混凝土应力>素混凝土应力。素混凝土、碳纤维布约束高温混凝土试件应变率增长因子始终高于温度增长因子,应变率对试件抗压强度影响高于温度影响;高温下碳纤维布混凝土试件温度增长因子始终高于应变率增长因子,高温作用对试件抗压强度影响度高于应变率影响。温度的升高使得三种混凝土试件韧性均降低,0.3 MPa冲击气压下,25 ℃时碳纤维布高温混凝土韧性是高温下碳纤维布混凝土、素混凝土韧性的1.02,2.62倍,600 ℃时为1.17,3.00倍,碳纤维布高温混凝土韧性>高温下碳纤维布混凝土韧性>素混凝土韧性,碳纤维布的约束效果极大增强了试件韧性。随着温度的升高,三种混凝土试件破碎耗能密度均不断降低,碳纤维布约束作用能够极大增强混凝土耗能效果,在高温作用后利用碳纤维布对混凝土进行维修加固,其吸能效果增幅更加显著。

关键词: 高温, 碳纤维布, 约束混凝土料, 应变率, 力学性能, 增长因子, 复合材料

Abstract: In order to explore the effect of high temperature and strain rate on mechanical properties of CFRP confined concrete, the static and dynamic uniaxial compression tests were carried out on three kinds of CFRP confined concrete (plain concrete, high temperature CFRP confined concrete and fiber cloth confined high temperature concrete) at different temperatures (25 ℃, 200 ℃, 400 ℃, 600 ℃) by Muffle furnace, servo press and Hopkinson press (SHPB). The effects of high temperature, strain rate and confinement mode on peak stress, dynamic reinforcement factor (DIF), toughness and energy dissipation density of specimens were analyzed. The results show that: the peak stress decreases 7.25%, 19.05% and 34.20% at 200 ℃, 400 ℃ and 600 ℃ under static load, the peak stress decreases 5.57%, 14.66% and 29.05% at 200 ℃, 400 ℃ and 600 ℃ under 0.5 MPa impact pressure. The peak stress of three kinds of concrete specimens decreases with the increase of temperature, and the peak stress of CFRP high temperature concrete is higher than that of plain concrete. The strain rate growth factor of the high temperature concrete specimens confined by plain concrete and carbon fiber cloth is always higher than the temperature growth factor, and the strain rate has a higher effect on the compressive strength of the specimens than the temperature. The temperature growth factor of CFRP specimens is always higher than that of strain rate, and the influence of high temperature on compressive strength is higher than that of strain rate. The increase of temperature reduces the toughness of the three kinds of concrete specimens. The toughness of CFRP high temperature concrete at 0.3 MPa impact pressure and 25 ℃ is 1.02 and 2.62 times that of CFRP and plain concrete, and 1.17 and 3.00 times at 600 ℃. The toughness of carbon fiber sheet high temperature concrete>high temperature carbon fiber sheet concrete>plain concrete. The restraint effect of carbon fiber sheet greatly enhances the toughness of the specimen. As the temperature increases, the energy dissipation density of the three kinds of concrete specimens decreases continuously. The restraint effect of carbon fiber cloth can greatly enhance the energy dissipation effect of concrete materials, and the energy absorption effect of using carbon fiber cloth for maintenance and reinforcement of concrete materials increases more after high temperature action.

Key words: high temperature, carbon fiber cloth, restrained concrete material, strain rate, mechanical properties, growth factor, composites

中图分类号:

TB332

张景丽, 康云健. 高温作用后碳纤维布约束混凝土动态力学性能试验研究[J]. 复合材料科学与工程, 2025, 0(3): 22-29.

ZHANG Jingli, KANG Yunjian. Experimental research on dynamic mechanical properties of concrete confined by carbon fiber sheet under high temperature[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(3): 22-29.

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