高温下热铸锚拉索的力学性能研究  

Study on mechanical properties of cable with hot-cast anchor sockets at elevated temperature

作　　者：郭刘潞 刘红波[1,2,3] 陈志华 樊泽源[1,3] GUO Liu-lu;LIU Hong-bo;CHEN Zhi-hua;FAN Ze-yuan(School of Civil Engineering,Tianjin University,Tianjin 300072,China;School of Civil Engineering,Hebei University of Engineerings Handan 056000;Key Laboratory of Coast Civil Structure and Safety,MOE,Tianjin University,Tianjin S00072,China)

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津大学滨海土木工程结构与安全教育部重点实验室,河北邯郸056000 [3]河北工程大学土木工程学院,天津300072

出　　处：《空间结构》2021年第2期49-55,共7页Spatial Structures

基　　金：国家重点研发计划(项目编号2018YFC0705500,课题编号2018YFC0705504)。

摘　　要：通过30个热铸锚拉索构件在常温及高温下的拉拔试验,获得不同温度下热铸锚拉索构件的失效模式及荷载-位移曲线,研究了热铸锚的粘结机理和高温下的失效机理.研究表明,温度低于100℃时,热铸锚锚固节点基本不会先于拉索破坏;高于300℃时,热铸料软化,拉索连同热铸料一起拔出.热铸锚拉索试件的极限强度和初始刚度随温度升高而下降,温度高于300℃时,节点开始失效,工程中可通过增大锚杯尺寸改善高温下锚固效果.By conducting static tensile tests on 30 cable specimens with hot-cast anchor sockets at room temperature and high temperature,this paper investigates the post-fire mechanical properties of the anchorage and the cable.Failure modes and load-displacement curves of the specimens at different temperatures are obtained.The bond mechanism of the hot cast anchor and the failure mechanism at high temperature are studied.Results show that when the temperature is lower than 100℃,the anchorage will not be damaged ahead of the cable.When the temperature is higher than 300℃,the hot cast material will soften and the cable will be pulled out together with the hot cast material.The ultimate strength and initial stiffness of hot cast anchor cable specimens decrease with the increase of temperature.Besides,the anchoring effect can be improved by increasing the size of the anchor cup in engineering.

关 键 词：钢绞线 热铸锚 高温 失效模式 力学性能 

分 类 号：TU351[建筑科学—结构工程]