BLAST RESISTANCE OF DOUBLE-LAYERED SLABS COMPOSED OF PRECAST THIN PLATES:Blast resistance of polyethylene fiber-reinforced concrete against contact detonation
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概要
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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.
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