Experimental Studies on Concrete Filled Steel Tubes under High Strain Rate Loading
Publication: Journal of Materials in Civil Engineering
Volume 21, Issue 10
Abstract
A split Hopkinson pressure bar equipment was used to perform high strain rate compressive tests on concrete filled steel tubes (CFT) along with benchmark plain concrete cylinders for comparison. This paper reports the results of dynamic compressive strength, ultimate strain, residual strength and the secant stiffness. The dynamic increase factor (DIF) of CFT strength upon the increase of strain rate was obtained based on the logarithm linear fitting of the test results. The DIF of the CFT specimens can be relatively well estimated with conservatism using the simple superposition of dynamic uniaxial strength of concrete and steel. The confinement stress and the confinement coefficient under high strain rate loading are also discussed based on assumptions similar to those used for the static loading cases.
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Acknowledgments
The research described in this paper was sponsored by the Center for Integrated Protection Research of Engineering Structures (CIPRES) of the Hunan University, under the Program for Changjiang Scholars and Innovative Research Team Project (Grant No. UNSPECIFIEDIRT0619), funded by the Ministry of Education of China, and the National Natural Science Foundation of China (Grant No. NNSFC50678065). The first writer also thanks the partial support of a travel fund provided by the National Science Foundation U.S.-China Exchange Program managed by MCEER.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 21 • Issue 10 • October 2009
Pages: 569 - 577
Copyright
© 2009 ASCE.
History
Received: Oct 16, 2007
Accepted: Mar 11, 2009
Published online: Sep 15, 2009
Published in print: Oct 2009
Notes
Note. Associate Editor: Kiang Hwee Tan
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