Experimental investigation on dynamic behavior of concrete after exposure to elevated temperatures

Abstract

This article deals with the dynamic behaviors of concrete after exposure to elevated temperatures using a split-Hopkinson pressure bar (SHPB) test set-up. Forty-nine concrete cylinders are experimentally investigated under different impact velocity after applied with different temperatures. A number of complementary static tests for concrete heated with different temperatures are also examined. The static and dynamic stress–strain relationships of all the concrete cylinders are recorded and compared. Further discussion then focuses on investigating the effect of the high temperature and strain rate, as well as the combined effect of both conditions on the concrete properties. Furthermore, a formula of temperature and strain-rate influencing factor is also proposed to predict the concrete compressive strength subjected to the combined effect of temperature and strain-rate.

Keywords:

• Impact loads
• elevated temperature
• strain rate effect
• dynamic increase factor
• temperature and strain-rate influencing factor

Acknowledgments

Additionally, the authors are grateful to the support with the experimental work at the Center for Integrated Protection Research of Engineering Structures (CIPRES), as well as Ministry of Education Key Laboratory of Building Safety and Efficiency in Hunan University.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The financial support of National Natural Science Foundation projects (50778069 and 51408212), the Program for New Century Excellent Talents in University (NCET-11-0123) and the Program for Changjiang Scholars and Innovative Research Team Project (IRT0619) for the research described in this paper is gratefully acknowledged.