Crack detection for wading-concrete structures using water irrigation and electric heating  

作　　者：Jiang CHEN Zizhen ZENG Ying LUO Feng XIONG Fei CHENG 

机构地区：[1]Failure Mechanics and Engineering Disaster Prevention Key Laboratory of Sichuan Province,Sichuan University,Chengdu 610065,China [2]MOE Key Laboratory of Deep Earth Science and Engineering,Sichuan University,Chengdu 610065,China [3]College of Architecture and Environment,Sichuan University,Chengdu 610065,China [4]College of Biomass Science and Engineering,Sichuan University,Chengdu 610065,China

出　　处：《Frontiers of Structural and Civil Engineering》2023年第3期368-377,共10页结构与土木工程前沿（英文版）

基　　金：This work was supported by the Natural Science Foundation of Sichuan Province(No.2022NSFSC0422);China and the Fundamental Research Funds for the Central Universities,China.

摘　　要：Cracking in wading-concrete structures has a worse impact on structural safety compared with conventional concrete structures.The accurate and timely monitoring of crack development plays a significant role in the safety of wading-concrete engineering.The heat-transfer rate near a crack is related to the flow velocity of the fluid in the crack.Based on this,a novel crack-identification method for underwater concrete structures is presented.This method uses water irrigation to generate seepage at the interface of a crack;then,the heat-dissipation rate in the crack area will increase because of the convective heat-transfer effect near the crack.Crack information can be identified by monitoring the cooling law and leakage flow near cracks.The proposed mobile crack-monitoring system consists of a heating system,temperature-measurement system,and irrigation system.A series of tests was conducted on a reinforcedconcrete beam using this system.The crack-discrimination indexψwas defined,according to the subsection characteristics of the heat-source cooling curve.The effects of the crack width,leakage flow,and relative positions of the heat source and crack onψwere studied.The results showed that the distribution characteristics ofψalong the monitoring line could accurately locate the crack,but not quantify the crack width.However,the leakage flow is sensitive to the crack width and can be used to identify it.

关 键 词：structural health monitoring underwater concrete structure fiber Bragg grating crack detection temperature tracer method 

分 类 号：O34[理学—固体力学]