首页|冲击作用下CFRP光圆筋与UHPC粘结性能的试验研究

冲击作用下CFRP光圆筋与UHPC粘结性能的试验研究

Experimental study on bonding behavior between CFRP smooth bar and UHPC under impact loading

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为明确冲击荷载作用下,碳纤维增强复合材料(Carbon fiber-reinforced polymer,CFRP)筋与超高性能混凝土(Ultra-high performance concrete,UHPC)粘结界面间化学粘结力和摩擦力的应变率效应,以锚固长度和荷载类型为参数,对 8组共计 24个采用UHPC作为粘结介质锚固的CFRP光圆筋试件(锚固长度分别为 20d～35d,d为CFRP筋材直径),分别进行了静力拉拔和筋材应变速率约为 4.0 s-1 的纵向冲击试验.结果表明:静力和纵向冲击试件均发生了光圆筋拔出的滑移破坏,相较于冲击试件,静力加载后CFRP光圆筋的表面损伤更明显.冲击荷载作用下,CFRP光圆筋与UHPC间界面的化学粘结强度和峰值粘结强度均呈现正的应变率效应,分别较相应的静力强度提高了约 53%和 17%;而峰值后界面的残余粘结强度即滑动摩擦阻力则表现为负的应变率效应,较相应的静力值降低约 38%.基于试验结果,建立了冲击作用下CFRP光圆筋与UHPC间界面动态粘结强度的预测公式.
To investigate effect of strain rate on chemical adhesion force and friction on the bonding interface between carbon fiber-reinforced polymer(CFRP)bars and ultra-high performance concrete(UHPC)under impact load,both static pull-out tests and longitudinal impact tests with the 4.0 s-1 strain rate were conducted on UHPC-filled anchorage for CFRP smooth bars.Totally,24 specimens for eight test groups with 20d-35d(d is CFRP bars diameter)embedded lengths were prepared.The results show that both static and longitudinal impact specimens fail in a similar pattern,that is,all CFRP bars slide out UHPC regardless of the embedded lengths and load types.However,the damage on the surface of CFRP bar is slightly severer in static tests than in impact tests.Under the im-pact,the chemical bond strength at the bonding interface between CFRP smooth bar and UHPC increases,thereby leading to an improved peak bond strength;however,the residual bonding strength(i.e.,friction)at the bond inter-face decreases.Compared with the corresponding static test specimens,the chemical bond strength and peak bond strength approximately increase by 53%and 17%,respectively,while the average residual bonding strength de-creases by about 38%.Besides,a prediction formula for predicting the dynamic bonding strength between CFRP smooth bar and UHPC under impact loads was established.

carbon fiber-reinforced polymer(CFRP)ultra-high performance concrete(UHPC)impact loadsbond strengthembedment length

蒋正文、刘朋杰、方志、方亚威、王志伟

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湖南大学 土木工程学院,长沙 410082

湖南大学 风工程与桥梁工程湖南省重点实验室,长沙 410082

中复碳芯电缆科技有限公司,连云港 222069

碳纤维增强树脂复合材料(CFRP) 超高性能混凝土(UHPC) 冲击荷载 粘结强度 锚固长度

国家自然科学基金国家自然科学基金湖南省科技创新计划(省优秀博士后创新人才计划)香江学者计划中国博士后基金面上项目

52108210519380122021RC2062XJ20220372021M690968

2024

10.13801/j.cnki.fhclxb.20230612.002

复合材料学报
北京航空航天大学 中国复合材料学会

复合材料学报

CSTPCD北大核心
影响因子：0.933
ISSN：1000-3851
年,卷(期)：2024.41(2)
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