Experimental studies on void detection in concrete-filled steel tubes using ultrasound

被引：56

作者：

Dong, Wei ^{[1
,2
]}

Wu, Zhimin ^{[1
]}

Zhou, Xiangming ^{[1
,3
]}

Tan, Yongjie ^{[1
]}

机构：

[1] Dalian Univ Technol, State Key Lab Coastal & Offshore Engn, Dalian 116024, Peoples R China

[2] DUT UWA, Ocean Engn Joint Res Ctr, Dalian 116024, Peoples R China

[3] Brunel Univ London, Dept Mech Aerosp & Civil Engn, Uxbridge UB8 3PH, Middx, England

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2016年 / 128卷

基金：

中国国家自然科学基金;

关键词：

Concrete-filled steel tube; Void area; Ultrasonic testing method; Propagation path; Chromatogram; De-bonding; EMBEDDED PIEZOELECTRIC ELEMENTS; DEFECTS;

D O I：

10.1016/j.conbuildmat.2016.10.061

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Due to shrinkage and/or inadequate compaction during concreting, voids may develop in a concrete-filled steel tube (CFST) between the concrete core and outer steel tube, which reduce the confinement effect of the steel tube on the concrete core, and further, decrease the load-carrying capacity and ductility of a CFST. In this study, an ultrasonic technique is utilized for quantifying voids in CFSTs by analyzing the ultrasound travel time in them. Four potential travel paths are identified in CFSTs with/without preset voids. By making a comparison of the experimental and theoretical ultrasound travel time, the actual ultrasound travel path is determined in CFSTs. Further, by analyzing the matrix of ultrasound travel time obtained from experiment, a novel method is proposed to generate the chromatogram of the distribution of ultrasound travel time, which is utilized to quantify the voids in a CFST. The chromatogram intuitively shows the position and geometry of the voids in CFST5 and is in reasonable agreement With the pre-set voids. This study, therefore, establishes a new method for quantifying voids in a CFST through the ultrasonic technique. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：154 / 162

页数：9

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