Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/31666
Title: Experimental and Numerical Studies on Behavior of Plain and Fiber-Reinforced High-Strength Concrete Subjected to High Strain Rate Loadings.
Authors: WANG SHASHA
Keywords: Fiber-reinforced high-strength concrete, High-velocity projectile impact, Size effect, SHPB, Strain rate effect, Tensile strength
Issue Date: 29-Jul-2011
Source: WANG SHASHA (2011-07-29). Experimental and Numerical Studies on Behavior of Plain and Fiber-Reinforced High-Strength Concrete Subjected to High Strain Rate Loadings.. ScholarBank@NUS Repository.
Abstract: This dissertation includes (i) an experimental study on effect of specimen size on static strength and dynamic increase factor (DIF) of plain and fiber reinforced high-strength concrete (HSC and FRHSC) determined from SHPB tests, (ii) an experimental study on effect of high strain rate loadings on compressive behavior of the HSC and FRHSC, (iii) an experimental study on relative contribution to impact resistance by tensile strength in comparison to toughness of cement-based material, and (iv) experimental and numerical studies on behavior of the HSC and FRHSC subjected to high-velocity projectile impact. Results indicate that cylinders with the same diameter as those of SHPB specimens but with L/D = 2 are suitable for determining the static strength to be used in DIF computations based on the stress state and failure patterns. Impact strength, elastic modulus, critical strain, and toughness of the concrete increased with strain rate. A modified DIF equation was proposed for the FRHSC. Experimental results suggest that toughness was a more important parameter than tensile strength that contributed to the impact resistance of the cement-based materials. High-velocity projectile impact tests indicate that the volume of crater might be a better parameter which correlates the toughness to the impact resistance of concrete. Finally, a FE model was developed using LS-DYNA to simulate the behavior of the HSC and FRHSC subjected to the high-velocity projectile impact.
URI: http://scholarbank.nus.edu.sg/handle/10635/31666
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