冻融循环作用下约束浆锚搭接连接性能试验研究  

Experimental Study on the Performance of Confined Mortar Anchor Lap Connection under Freeze-thaw Cycles

作　　者：孙杰[1] 孙和 廖海峰 王厚安 SUN Jie;SUN He;LIAO Haifeng;WANG Houan(School of Urban Construction,Wuhan University of Science and Technology,Wuhan,Hubei 430065,China;Central&Southern China Municipal Engineering Design and Research Institute Co.,Ltd.,Wuhan,Hubei 430010,China)

机构地区：[1]武汉科技大学城市建设学院,湖北武汉430065 [2]中国市政工程中南设计研究总院有限公司,湖北武汉430010

出　　处：《水利与建筑工程学报》2024年第5期98-105,共8页Journal of Water Resources and Architectural Engineering

基　　金：湖北省住房与城乡建设厅科技计划项目;道路结构与材料交通运输行业重点实验室(交通运输部公路科学研究所)开放基金。

摘　　要：为了研究冻融环境下约束浆锚搭接试件的连接性能,以灌浆料种类(高强水泥基灌浆料、环氧树脂灌浆料、地聚物灌浆料)和冻融循环次数(0次、50次、100次)为主要试验参数,进行27个约束浆锚搭接试件的单向拉拔试验,分析试件的外观变化,破坏形态、极限荷载、荷载-位移曲线及荷载-应变曲线。结果表明:常温下和冻融50次后,试件均发生钢筋拉断破坏;100次后试件发生劈裂破坏。常温下和冻融50次后三种灌浆料的约束浆锚搭接试件的连接性能均可靠;冻融循环次数达到100次,极限荷载大幅降低。试件的极限粘结强度随着冻融循环次数的增加逐渐降低。约束浆锚搭接连接性能可靠,三种灌浆料均能满足锚固要求。In order to analyze the connection performance of grouted anchor lap splice specimens under freeze-thaw environments,the type of grouting material(high-strength cementitious grout,epoxy resin grout,geopolymer grout)and the number of freeze-thaw cycles(0,50,100)were selected as the main test parameters.A total of 27 unidirectional pull-out tests were conducted on grouted anchor lap splice specimens.The changes in specimen appearance,failure modes,ultimate load,load-displacement curves,and load-strain curves were analyzed.After 50 freeze-thaw cycles and at room temperature,the specimens exhibited rebar fracture failure,while after 100 freeze-thaw cycles,the specimens exhibited splitting failure.The results show that the connection performance of grouted anchor lap splice specimens with the three types of grouting materials was reliable at room temperature and after 50 freeze-thaw cycles.However,when the number of freeze-thaw cycles reached 100,the ultimate load significantly decreased.The ultimate bond strength of the specimens gradually decreased with the increase in freeze-thaw cycles.The grouted anchor lap splice connection performance is reliable,and all three types of grouting materials can meet anchoring requirements,providing reference value for the selection of grouting materials.

关 键 词：约束浆锚搭接 冻融循环 单向拉伸 锚固能力 极限粘结强度 

分 类 号：TU375[建筑科学—结构工程]