摘要
为掌握在役预应力锚索的预应力状态,基于切向刚度理论,考虑工作状态下预应力锚索外锚头段结构传递效应,建立一种新的锚索预应力测试模型,并采用静载与动载试验进行验证。模型将外锚头段锚具与锚垫板间粗糙接触界面简化为锚固-接触模型,基于Hertz接触理论及GW统计接触模型,将锚索预应力的测量转化为对接触面切向接触刚度的识别,利用测量得到的切向荷载与切向位移,给出确定性的外锚头段切向刚度与锚索预应力值计算公式。静载与动载验证试验表明,得到的切向刚度与预应力试验值与理论值的平均相对误差为7.41%,使用弹性波为检测媒介得到的切向刚度与预应力试验值与理论值的平均相对误差也在10%之内,证实外锚头锚固-接触模型的正确性与切向刚度测力方法的可行性。该测试方法为在役锚索预应力检测提供了一种新的有效且无损的检测手段。
To investigate the prestress state of prestressed anchor cables in service,a new prestress test model was established.This model is based on tangential stiffness theory and considering the structural transfer effect of external anchor segment under working condition,and verified by static and dynamic loading tests.By simplifying the rough contact interface between the anchor and anchor base plate of the external head segment as an anchorage-contact model,and based on Hertz contact theory and GW statistical contact model,this test model transforms the measurement of cable's prestress into the identification of the tangential contact stiffness of the contact surface,then obtains the quantitative tangential stiffness of the external anchor segment and the calculating formula of anchor cable prestress,from the measured tangential load and displacement.The static and dynamic loading tests indicat that,the average relative error between the experimental and theoretical values of tangential stiffness and prestress is 7.41%,while this error is within 10%by measuring through elastic wave.These results support the correctness of the anchorage-contact model at external anchor head segment,and the feasibility of the tangential stiffness test method.This test method provides a new effective and nondestructive measurement for the prestress of anchor cables in service.
作者
陈强
周志鸿
朱宝龙
CHEN Qiang;ZHOU Zhihong;ZHU Baolong(School of Geosciences and Environment Engineering,Southwest Jiaotong University,Chengdu,Sichuan 611756,China;China Merchants Chongqing Highway Engineering Testing Center Co.,Ltd.,Chongqing 400067,China;School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2022年第8期1595-1609,共15页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(41672342)。
关键词
岩土工程
锚索
预应力测试
外锚头
切向刚度
geotechnical engineering
anchor cable
prestress test
external anchor head segment
tangential stiffness
