摘要
植筋作为一项新老结构连接锚固技术,被广泛应用于结构改建和加固中。为弄清孔内湿度对植筋受力性能的影响,分6个湿度组,每组两根螺杆,共计开展了12根植筋螺杆拉拔试验。对不同湿度影响下的植筋拉拔力、螺杆位移及破坏模态进行详细研究。研究得出,植筋效果严重受孔内湿度影响,随着湿度增加,植筋破坏模态将发生改变。随着湿度降低,植筋拉拔力显著提高,螺杆、胶体及混凝土基体之间的咬合力越强,达到拉拔力峰值及破坏时所对应的螺杆位移也越小。研究还提出了植筋破坏模态转变的临界湿度指标和单位孔壁面积拉拔力随湿度改变的下降速率。
As a new technology to connect new and old structures,embedded screw bar is widely applied at reconstruction and reinforcement of structures.To make clear the effect of humidity on mechanical properties of embedded screw bar,twelve embedded screw bars which are divided into six groups and per group included two embedded screw bars are developed to conduct drawing testing.Drawing force,displacement,and failure mode of embedded screw bar under different humidity is detailedly investigated.It is showed that the effect of embedded screw bar is greatly influenced by humidity,and with the increasing of humidity,the failure mode of embedded screw bar will change.With the decreasing of humidity,the drawing force will be improved significantly,and the biting force between embedded screw bar,glue and concrete body becomes strong,and the displacement of embedded screw bar corresponding to the maximum drawing force and failure also becomes small.Lastly,the critical humidity for failure mode shift and the drop rate of drawing force per unit hole area are also concluded.
作者
梁瑞卿
施宏侣
王振宇
史文华
耿正君
高泽宇
LIANG Ruiqing;SHI Honglv;WANG Zhenyu;SHI Wenhua;GENG Zhengjun;GAO Zeyu(Road Development Center of Luohe City,Luohe 462001,China;Hubei Jiaotou Intelligent Testing Co Ltd,Wuhan 430104,China;School of Civil And Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《土木工程与管理学报》
2021年第2期140-144,共5页
Journal of Civil Engineering and Management
基金
国家自然科学基金(51678264)
河南省交通运输科技计划项目(2020J-2-9)。
关键词
植筋
湿度
拉拔力
破坏模态
位移
embedded screw bar
humidity
drawing force
failure mode
displacement
作者简介
梁瑞卿(1969-),男,河南漯河人,工程师,研究方向为桥梁养护与管理(Email:nanerlou111@163.com);通讯作者:高泽宇(1997-),男,福建福安人,硕士研究生,研究方向为建筑材料与结构(Email:gaozy@hust.edu.cn)。
