冻融循环作用下轻骨料混凝土及普通混凝土后锚固化学锚栓抗拔性能对比分析  

Comparative analysis of pull⁃out resistance of post⁃anchored chemical anchor bolts in lightweight aggregate concrete and ordinary concrete under freeze⁃thaw cycles

作　　者：杜红凯 许鹏 王海萌 杨富雄 王金宇 Du Hongkai;Xu Peng;Wang Haimeng;Yang Fuxiong;Wang Jinyu(School of Civil and Transporation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044

出　　处：《建筑科学》2024年第3期163-168,共6页Building Science

摘　　要：为研究冻融循环作用下轻骨料混凝土锚固化学锚栓的拔出抗拉性能,分析冻融循环次数对抗拉性能的影响,并和普通混凝土后锚固化学锚栓的性能进行对比分析。选取倒锥形化学锚栓,制作轻骨料混凝土和普通混凝土化学锚栓试件各24个,进行静力约束抗拉试验,对比试验现象,分析化学锚栓在混凝土中的拔出承载力和粘接强度。研究发现倒锥形化学锚栓在两种混凝土中的破坏模式均为胶-筋界面破坏;粘结强度与拔出承载力均随冻融次数的增加而降低,但在轻骨料混凝土中的下降速度明显低于在普通混凝土中的下降速度。To study the pull⁃out properties of chemical anchor bolts in lightweight aggregate concrete under freeze⁃thaw cycles,the influence of the freeze⁃thaw cycles on the tensile properties is analyzed,and the performance of post⁃anchored chemical anchor bolts in ordinary concrete.The inverted conical chemical anchor bolts are selected to make 24 chemical anchor bolts of lightweight aggregate concrete and ordinary concrete respectively.The static restraint tensile tests are conducted to compare the experimental phenomena,and analyze the pulling resistance and bonding strength of chemical anchor bolts in the two concretes.It is found that the failures of the inverted conical chemical anchor bolts are mainly in the glue⁃reinforcement interface in both two concretes.The bond strength and pull⁃out resistance decrease with the increase of freeze⁃thaw cycles,but the decrease rate in lightweight aggregate concrete is obviously lower than that in ordinary concrete.

关 键 词：化学锚栓 轻骨料混凝土 冻融循环 粘接强度 拔出承载力 

分 类 号：TU528[建筑科学—建筑技术科学]