Size and Strain Rate Effects on the Fracture of Reinforced Concrete

2007 ◽  
pp. 283-284
Author(s):  
Gonzalo Ruiz ◽  
Xiaoxin Zhang ◽  
Rena C. Yu
Keyword(s):  
Reinforced Concrete ◽  
Strain Rate ◽  
Strain Rate Effects ◽  
Rate Effects

Strain Rate Effects on Tensile Properties of Fiber Reinforced Concrete

1985 ◽  
Vol 64 ◽  
Author(s):  
George G. Nammur ◽  
Antoine E. Naaman
Keyword(s):  
Reinforced Concrete ◽  
Strain Rate ◽  
Volume Fraction ◽  
Tensile Tests ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Strain Rate Effects ◽  
Rate Effects ◽  
The Matrix

ABSTRACTHigh strain rates lead to substantial modifications in the stress-strain (or stress-displacement) response of fiber reinforced concrete in tension. These modifications include higher strength and corresponding strain, as well as smaller displacement at failure.The purpose of this paper is to investigate the behavior of fiber reinforced concrete under impact tensile loading, and to study the effect of strain rate on the post-cracking strength of the composite. The variation of the tensile strength of the matrix with the reinforcement parameters such as volume fraction Vf and aspect ratio |/φ of the fibers is also studied ip this paper. A special emphasis is placed on the stress-displacement relationship of steel fiber reinforced concrete in its post-cracking range. An empirical model of the stress- displacement relationship as a function of the strain rate is developed from experimental data from tensile tests on dogbone shape notched tensile prisms. The model highlights the effects of strain rate and fiber properties on the post-cracking strength of the composite, as well as the displacement at failure. The effect of strain rate on the post-cracking toughness of fiber reinforced concrete is also addressed. The literature on impact effects on concrete in tension (plain and fiber reinforced) is briefly reviewed in this paper, and so is the state of the art of testing techniques for strain rate effects.

Experimental Study on Dynamic Compression of Nylon Reinforced Concrete

2006 ◽  
Vol 326-328 ◽  
pp. 1581-1584 ◽  
Author(s):  
Qing Ming Zhang ◽  
Zhong Ming Gu ◽  
Li Chen ◽  
Xiao Ying Wang ◽  
Shi Sheng Hu
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Strain Rate ◽  
Dynamic Compression ◽  
Failure Strength ◽  
Strain Rate Effects ◽  
Heterogeneous Effects ◽  
Rate Effects ◽  
Large Particles

Results of tests using two kinds of nylon reinforced concrete samples are described . In order to deal with the heterogeneous effects of samples resulted from large particles which range from7mm to10mm in diameters, a SPH bar which is 74mm in diameter is used. There seems something new and difficult in the method of testing the concrete’s dynamic compressive responses. The results show that there are obvious strain rate effects in both the two kinds of samples , and the failure strength increases with the increasing of the strain rate.

scholarly journals Strain rate effects on ultra high performance fiber reinforced concrete (UHP-FRC) with various fiber contents

2021 ◽  
Author(s):  
Sayed-Mohammad Banitabaei-Koupaei
Keyword(s):  
Reinforced Concrete ◽  
Strain Rate ◽  
Dynamic Loading ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Strain Rates ◽  
Fiber Reinforced ◽  
Strain Rate Effects ◽  
Rate Effects ◽  
High Performance Fiber

Ultra High Performance Fiber Reinforced Concrete (UHP-FRC) was introduced in the mid-1990s and has made striking advances in recent years. Ductal® is a UHP-FRC technology that offers a unique combination of characteristics including but, not limited to ductility, strength and durability, while providing highly moldable products with quality surfaces. Compressive strengths, and equivalent flexural strengths reach up to 200 and 40 MPa, respectively. UHP-FRC also shows an outstanding performance under dynamic loading in structures subjected to extreme loading conditions such as impact, earthquake and blast. Moreover, UHP-FRC indicates an optimized combination of properties for a specific application. Three series of tests including compression, indirect tension, and flexure were conducted under various strain rates from quasi-static to dynamic loading with low strain rates. The objective of this project is to enhance knowledge of strain rate effects on UHP-FRC with various fiber contents and to report Dynamic Increase Factor (DIF).

scholarly journals Strain rate effects on ultra high performance fiber reinforced concrete (UHP-FRC) with various fiber contents

2021 ◽  
Author(s):  
Sayed-Mohammad Banitabaei-Koupaei
Keyword(s):  
Reinforced Concrete ◽  
Strain Rate ◽  
Dynamic Loading ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Strain Rates ◽  
Fiber Reinforced ◽  
Strain Rate Effects ◽  
Rate Effects ◽  
High Performance Fiber

Ultra High Performance Fiber Reinforced Concrete (UHP-FRC) was introduced in the mid-1990s and has made striking advances in recent years. Ductal® is a UHP-FRC technology that offers a unique combination of characteristics including but, not limited to ductility, strength and durability, while providing highly moldable products with quality surfaces. Compressive strengths, and equivalent flexural strengths reach up to 200 and 40 MPa, respectively. UHP-FRC also shows an outstanding performance under dynamic loading in structures subjected to extreme loading conditions such as impact, earthquake and blast. Moreover, UHP-FRC indicates an optimized combination of properties for a specific application. Three series of tests including compression, indirect tension, and flexure were conducted under various strain rates from quasi-static to dynamic loading with low strain rates. The objective of this project is to enhance knowledge of strain rate effects on UHP-FRC with various fiber contents and to report Dynamic Increase Factor (DIF).

Effects of Strain Rate on Reinforced Concrete Beam

2011 ◽  
Vol 243-249 ◽  
pp. 4033-4036 ◽  
Author(s):  
Min Li ◽  
Hong Nan Li
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Strain Rate ◽  
Failure Mode ◽  
Loading Rate ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Strain Rate Effects ◽  
Shear Span ◽  
Rate Effects

The strain-rate effects of reinforced concrete beams are studied in this paper. Considering the strain-rate effects of structural material, dynamic responses of reinforced concrete beams subjected to monotonic loading and cyclic loading at different loading rates that might be experienced during earthquakes are simulated using the nonlinear finite element program ABAQUS. The influences of loading rate on loading capability and failure mode of reinforced concrete beams are investigated. The results show that as the loading rate increases, the loading capability increases, the increment is associated with the shear span ratio and loading mode. The increment at cyclic loading is smaller than that at monotonic loading; as the shear span ratio changes, the failure mode changes, the increment changes; the failure mode has nothing to do with the loading rate.

NONLINEAR ANALYSIS OF SHOCK-LOADED REINFORCED CONCRETE STRUCTURES

2004 ◽  
Vol 04 (02) ◽  
pp. 223-236 ◽  
Author(s):  
M. V. DHARANEEPATHY ◽  
N. ANANDAVALLI
Keyword(s):  
Reinforced Concrete ◽  
Finite Elements ◽  
Strain Rate ◽  
Numerical Procedure ◽  
Nonlinear Behavior ◽  
Strain Rate Effects ◽  
Rate Effects ◽  
Solid Finite Elements ◽  
Rectangular Slab ◽  
Protective Structures

Extensive use of reinforced concrete to build shock-protective structures calls for adequate analytical expertise to facilitate rational and safe structural designs. Although several researchers have studied these problems, there are still some uncertainties, particularly with regard to strain-rate effects. This paper presents a simplified, but accurate, numerical procedure for modeling the nonlinear behavior of reinforced concrete, using solid finite elements, which include strain-rate effects. The details of the material modeling for anisotropic concrete and isotropic steel are presented. A clamped circular plate subjected to uniformly distributed load and a clamped rectangular slab subjected to jet force are analyzed using 8-noded solid finite elements. Strain-rate effects are considered in the analyses.

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