プレキャスト薄板要素の積層による2層構造版の耐爆性能:ポリエチレン繊維補強コンクリートの接触爆発に対する耐爆性能

摘要

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.%本研究は，突発的な意図的攻撃に対応するため，PEFRCを用いてrn作製したプレキャスト薄板（厚さ50mm ）の現場積層により運搬・rn取り付け等の施工性向上および施工の迅速化を図り，尚且つ総厚がrn等しいPEFRC単版と同等以上の耐爆性能を有するPEFRC 2層構造rn版の開発を目的としたものである。