نتایج جستجو برای: shear enhancement

تعداد نتایج: 198523  

Journal: :journal of rehabilitation in civil engineering 2014
azadeh alsadat asghari zahra tabrizian morteza hossein ali beigy gholamreza ghodrati amiri bahram navayineya

. this paper presents the results of an experimental investigation on shear strength enhancement of reinforced concrete deep beams externally reinforced with fiber reinforced polymer (frp) composites. a total of six deep beam specimens of two different classes, as-built (unstrengthened) and retrofitted were tested in the experimental evaluation program. two composite systems namely carbon/epoxy...

2005
James Nolen Jack Xin JAMES NOLEN

We prove the existence of reaction-diffusion traveling fronts in mean zero space-time periodic shear flows for nonnegative reactions including the classical KPP (Kolmogorov-Petrovsky-Piskunov) nonlinearity. For the KPP nonlinearity, the minimal front speed is characterized by a variational principle involving the principal eigenvalue of a space-time periodic parabolic operator. Analysis of the ...

Azadeh Alsadat Asghari Bahram Navayineya, Gholamreza Ghodrati Amiri, Morteza Hossein Ali Beigy Zahra Tabrizian,

. This paper presents the results of an experimental investigation on shear strength enhancement of reinforced concrete deep beams externally reinforced with fiber reinforced polymer (FRP) composites. A total of six deep beam specimens of two different classes, as-built (unstrengthened) and retrofitted were tested in the experimental evaluation program. Two composite systems namely carbon/epoxy...

2005
James Nolen Jack Xin

The variational principle for Kolmogorov–Petrovsky–Piskunov (KPP) minimal front speeds provides an efficient tool for statistical speed analysis, as well as a fast and accurate method for speed computation. A variational principle based analysis is carried out on the ensemble of KPP speeds through spatially stationary random shear flows inside infinite channel domains. In the regime of small ro...

2012
Tiejun Wang Yulong Li Bing HOU Weihong Zhang Stephane Pattofatto Dominique Saletti Huabin Zeng

III Abstract: This study aims at the energy absorption problems in the crash of high speed vehicles, bird impact and crashworthiness design of aircraft, and the dynamic enhancement and multi-axial behavior of honeycombs under combined shearcompression are investigated. The study consists mainly of two parts. The first part is related to the dynamic strength enhancement of honeycombs under uniax...

Journal: :Soft matter 2014
Pramukta Kumar David Gold Daniel L Blair Aparna Baskaran Jeffrey S Urbach

A non-Brownian suspension of micron scale rods exhibits reversible shear-driven formation of disordered aggregates resulting in dramatic viscosity enhancement at low shear rates. Aggregate formation is imaged using a combined rheometer and fluorescence microscope. The size and structure of these aggregates are found to be a function of shear rate and concentration, with larger aggregates presen...

Journal: :Journal of Geophysical Research 1979

2001
B Khouider

We document and explain the existence of two distinct scaling regimes for the burning speed enhancement of an idealized premixed flame as a result of its distortion by an unsteady periodic shear. The simplified model used in the present study allows for a rigorous, quantitative explanation of the bending in the scaling exponent, either linear or sublinear in the shear intensity, in terms of a n...

Journal: :Magazine of Concrete Research 2015

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