Impact performances of steel tube-confined recycled aggregate concrete (STCRAC) after exposure to elevated temperatures

被引：48

作者：

Li, Wengui ^{[1
]}

Luo, Zhiyu ^{[1
,2
]}

Wu, Chengqing ^{[1
]}

Duan, Wen Hui ^{[3
]}

机构：

[1] Univ Technol Sydney, Sch Civil & Environm Engn, Ctr Built Infrastruct Res, Sydney, NSW 2007, Australia

[2] Hunan Univ, Coll Civil Engn, Changsha 410082, Hunan, Peoples R China

[3] Monash Univ, Dept Civil Engn, Clayton, Vic 3800, Australia

来源：

CEMENT & CONCRETE COMPOSITES | 2018年 / 86卷

基金：

澳大利亚研究理事会; 中国国家自然科学基金;

关键词：

Steel tube-confined recycled aggregate concrete (STCRAC); Splitting Hopkinson pressure bar (SHPB); Elevated temperature; Impact behaviour; Dynamic increase factor (DIF); COMPRESSIVE BEHAVIOR; MECHANICAL-PROPERTIES; DYNAMIC-BEHAVIORS; POSTFIRE BEHAVIOR; RESIDUAL STRENGTH; STUB COLUMNS; FIRE;

D O I：

10.1016/j.cemconcomp.2017.11.009

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The impact behaviours of steel tube-confined recycled aggregate concrete (STCRAC) following exposure to elevated temperatures of 20 degrees C, 200 degrees C, 500 degrees C and 700 degrees C were experimentally investigated using a 100 mm-diameter split Hopkinson pressure bar (SHPB). The recycled coarse aggregate (RCA) replacement ratios were set as 0, 50% and 100%. The effect of RCA replacement ratio and exposure temperature on the impact properties of STCRAC were analysed in terms of failure modes, stress-strain time history curve and dynamic increase factor (DIF). The results show that the fire-damaged STCRAC can maintain its integrity during impact load. However, there were evident degradations in the dynamic behaviour of STCRAC after exposure to high temperatures of 500 degrees C and 700 degrees C. The ultimate impact strength, impact secant modulus and residual impact strength of STCRAC obviously decreased because of the damage due to high temperature exposure. But the degradations of both the ultimate impact strength and impact secant modulus of STCRAC under impact loading were less severe than those under quasi-static loading. The remaining strength factor and the DIF tended to increase with the raise of the elevated temperatures. Overall, during the impact loading, the fire-deteriorated STCRAC exhibited excellent impact behaviour. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：87 / 97

页数：11

共 40 条

[1] COMPRESSIVE BEHAVIOR OF CONCRETE AT HIGH-STRAIN RATES [J].

BISCHOFF, PH ;

PERRY, SH .

MATERIALS AND STRUCTURES, 1991, 24 (144) :425-450

[2] Residual strength of concrete containing recycled materials after exposure to fire: A review [J].

Cree, D. ;

Green, M. ;

Noumowe, A. .

CONSTRUCTION AND BUILDING MATERIALS, 2013, 45 :208-223

[3]

Dong J. F., 2015, MAG CONCRETE RES, V68, P1

[4] Anatomy of Tianjin Port Fire and Explosion: Process and Causes [J].

Fu, Gui ;

Wang, Jianhao ;

Yan, Mingwei .

PROCESS SAFETY PROGRESS, 2016, 35 (03) :216-220

[5] Microstructure of fire-damaged concrete. A case study [J].

Georgali, B ;

Tsakiridis, PE .

CEMENT & CONCRETE COMPOSITES, 2005, 27 (02) :255-259

[6]

GOPALARATNAM VS, 1986, J AM CONCRETE I, V83, P117

[7]

HAN L.H., 2007, Concrete-filled steel tubular structure-Theory and Practice

[8] Compressive and flexural behaviour of concrete filled steel tubes after exposure to standard fire [J].

Han, LH ;

Huo, JS ;

Wang, YC .

JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH, 2005, 61 (07) :882-901

[9] Experimental study on dynamic behaviours of concrete after exposure to high temperatures up to 700 A°C [J].

Huo, J. S. ;

He, Y. M. ;

Xiao, L. P. ;

Chen, B. S. .

MATERIALS AND STRUCTURES, 2013, 46 (1-2) :255-265

[10] Experimental study on impact behaviour of concrete-filled steel tubes at elevated temperatures up to 800 A°C [J].

Huo, Jingsi ;

He, Yuanming ;

Chen, Baisheng .

MATERIALS AND STRUCTURES, 2014, 47 (1-2) :263-283

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