Strain Rate Effects for Concrete and Fiber Reinforced Concrete Subjected to Impact Loading
Abstract
Despite it's extensive use, low tensile strength has been recognized as one of the major drawbacks of concrete. Although one has learned to avoid exposing concrete structures to adverse static tensile loads, these structures cannot be shielded from short duration dynamic tensile loads. Such loads originate from sources such as impact from missiles and projectiles, wind gusts, earthquakes and machine vibrations. In addition, modern computer-aided analysis and use of concrete for special structures such as reactor containment vessels, missile storage silos and fall-out shelters, has led to a growing interest in the cracking behavior of concrete. Experimental results indicate that the fracture strength and cracking behavior of concrete are affected by the rate of loading. To accurately predict the structural response under impact conditions, the knowledge of behavior of concrete at high rates of loading is essential. Using a two degree of freedom model guidelines were developed for designing an impact test setup, thus enabling one to conduct impact tests free of adverse inertial effects. Based on these guidelines, the author has developed an instrumented modified Charpy impact testing system. This experimental test setup was used to obtain basic information such as load-deflection relationship, fracture toughness, crack velocity (measured using 'Krak Gages'), and load- strain history during an impact fracture event of plain concrete and SFRC. Keywords: Charpy tests, Cracks, Concrete, Constitutive modeling, Damage, Dynamic, Experiments, Fiber composite, Fiber reinforced concrete, Flexural fracture, Fracture mechanics, Impact, Instrumented testing, Microcracks.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1987
- Accession Number
- ADA188659
Entities
People
- Surendra P. Shah
Organizations
- Northwestern University