Table of Contents Author Guidelines Submit a Manuscript
The Scientific World Journal
Volume 2014 (2014), Article ID 173531, 11 pages
http://dx.doi.org/10.1155/2014/173531
Research Article

Experimental and Numerical Study on Tensile Strength of Concrete under Different Strain Rates

1College of Mechanics and Materials, Hohai University, 1 Xikang Road, Nanjing 210098, China
2State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China
3CCCC Tunnel Engineering Company Limited, Beijing 100088, China
4Geotechnical Research Institute of Hohai University, Nanjing 210098, China

Received 30 December 2013; Accepted 10 March 2014; Published 16 April 2014

Academic Editors: G. Morcous and J. Zheng

Copyright © 2014 Fanlu Min et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The dynamic characterization of concrete is fundamental to understand the material behavior in case of heavy earthquakes and dynamic events. The implementation of material constitutive law is of capital importance for the numerical simulation of the dynamic processes as those caused by earthquakes. Splitting tensile concrete specimens were tested at strain rates of 10−7 s−1 to 10−4 s−1 in an MTS material test machine. Results of tensile strength versus strain rate are presented and compared with compressive strength and existing models at similar strain rates. Dynamic increase factor versus strain rate curves for tensile strength were also evaluated and discussed. The same tensile data are compared with strength data using a thermodynamic model. Results of the tests show a significant strain rate sensitive behavior, exhibiting dynamic tensile strength increasing with strain rate. In the quasistatic strain rate regime, the existing models often underestimate the experimental results. The thermodynamic theory for the splitting tensile strength of concrete satisfactorily describes the experimental findings of strength as effect of strain rates.