QUANTITATIVE EVALUATION OF FRACTURE PROCESS AND REINFORCING EFFECT IN CENTER NOTCHED CONCRETE BEAMS REINFORCED WITH FIBER PLASTIC SHEETS BY A MOMENT TENSOR ANALYSIS OF ACOUSTIC EMISSION

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  • 繊維シート補強コンクリートはりのAEモーメントテンソル解析による破壊過程および補強効果の定量的評価
  • センイ シート ホキョウ コンクリートハリ ノ AE モーメントテンソル カイセキ ニ ヨル ハカイ カテイ オヨビ ホキョウ コウカ ノ テイリョウテキ ヒョウカ

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Abstract

Center notched concrete beams reinforced with carbon fiber (CFRP) and glass fiber (GFRP) reinforced plastic sheets were subjected to three-point bending. Fracture process and reinforcing effect were quantitatively evaluated by the analysis of AE signals detected during the tests. A moment tensor analysis showed that the fracture progresses in three stages, where cracks were generated in a small region at the notch tip, then along with main crack extension, initiation and extension of an inclined crack (45-degree) occurred from the tensile zone to the notch tip, and finally cracks were generated near the interface between the fiber sheet and concrete. It was shown that the load of crack initiation and the maximum load in the first stage of the fracture process increase greatly by the reinforcing effect of the bonded fiber sheets.

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