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Your search keyword '"Takayuki Hirai"' showing total 23 results
Start Over Author "Takayuki Hirai" Journal journal of structural and construction engineering (transactions of aij)
23 results on '"Takayuki Hirai"'

1. INFLUENCES OF SLAB COMPOSITION USING PRECAST SMALL ELEMENTS ON BLAST RESISTANCE

Author

Kiyoshi Murakami, Takayuki Hirai, Makoto Yamaguchi, Yoshiyuki Mitsui, and Koji Takeda

Subjects
Materials science, business.industry, Detonation, Local failure, Building and Construction, Fiber-reinforced concrete, Structural engineering, Polyethylene, law.invention, chemistry.chemical_compound, chemistry, law, Precast concrete, Architecture, Slab, Composite material, business
Published
2012
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3. BLAST RESISTANCE OF DOUBLE-LAYERED SLABS COMPOSED OF PRECAST THIN PLATES

Author

Makoto Yamaguchi, Kiyoshi Murakami, Takayuki Hirai, and Yoshiyuki Mitsui

Subjects
endocrine system, Toughness, animal structures, Materials science, business.industry, Rapid construction, Detonation, Building and Construction, Fiber-reinforced concrete, Structural engineering, Polyethylene, Spall, law.invention, chemistry.chemical_compound, chemistry, law, Precast concrete, Architecture, Slab, Composite material, business
Abstract

For rapid construction of blast-resistant structures and better blast resistance of PEFRC (polyethylene fiber-reinforced concrete) slab, the double-layered PEFRC slabs composed of precast thin plates with 50 mm thick were proposed and supplied for contact detonation tests. Based on the test results, numerical simulation with the ANSYS AUTODYN code was conducted to clarify fracture mechanism of double-layered normal concrete slab with an air space. The main results obtained are as follows: 1) making an air space of 15 mm thick in the middle of the double-layered PEFRC slab is effective in reducing spall damage, however, an air space is disadvantageous in normal concrete; 2) breach in the lower layer of the air-sandwiched normal concrete slab is due to impact of concrete fragments occurred in the back surface of the upper layer; and 3) good blast resistance of the air-sandwiched PEFRC slab can be explained qualitatively, considering high toughness of both layers due to bridging effects of polyethylene short fibers.

Published
2010
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6. THE INFLUENCE FACTOR ON THE COMPRESSIVE STRENGTH OF POROUS CONCRETE : The influence of vibration and coarse aggregate size on the binder distribution and compressive strength in porous concrete

Author

Toshihiro Otani, Yoshiaki Sato, Takayuki Hirai, Yoshiyuki Mitsui, and Kiyoshi Murakami

Subjects
Vibration, Aggregate (composite), Materials science, Compressive strength, Influence factor, Architecture, Pervious concrete, Ultimate tensile strength, Geotechnical engineering, Building and Construction, Composite material
Published
2004
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12. INTERACTION OF FIBER LENGTH, FIBER VOLUME FRACTION AND MATRIX STRENGTH ON FRACTURE TOUGHNESS : Study on fracture mechanics of fiber reinforced concrete

Author

Toshio Urano, Takayuki Hirai, Koichi Kishitani, Kiyoshi Murakami, and Yoshiyuki Mitsui

Subjects
Fiber pull-out, Fracture toughness, Materials science, law, Reinforced solid, Volume fraction, Fracture mechanics, Matrix strength, Fiber, Fiber-reinforced concrete, Composite material, law.invention
Published
1993
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