Thc tension softeni19 diagram provides valuab 且 e inforlnations to discuss the ・ fra (; tUre behavioT of concrete . ln this paper , the numcrical analysis method to calculate the poly −・ 1ilear tens . ion sefteing Cliagram is investigated . Thc prediction method for the Ioad − disp 且 acement relationship ミ of concrcte . with cracks is developed by using the fictitious crack modeL conbept with the K − supe 【 position inethod and the constitutive law by the poly − linear tension sofiening dlagram . In this m6thod , 皿 onlinear crack equations are solved by the iteration plogram of evaluating the softening inclinations . Poly . 一 ! inear appToximation mcthod for galculatiI1 琴 the sof し ening diagram from the actual load − displqcerpent culvc is proposed based on the . crack equation anatysis method . 1[ he softening diagrams of concTetes 蛸 tb various aggregates and matrix strengths are measured and their characte τistics are ' discusse ' d. Kcy,,ηnlS : 脚 ∫ε 0 π 3 (-舜επ' π g 伽 8厂am , poly − ' ∫ ηeσ7 卿 ro曜脚 ∫ 10 馬 CノαC舵 卯 α∫ 1 ρπ,
Restoration of strength properties of crack repaired concrete specimen has been studied . Three − point bend tests were carried out on undamaged notched concrete specirnens and damaged ones which crack repaired by epoxy resin , a 冂 d restoration of the specimen was evaluated by means o 正 fracture mechanics parameters such as the fracture energy G , and the bending strength . The bend − ing strength of repaired concrete specimen was proportional to the E − modu 且 us of resin , and in− versely proport孟 onal to the width of crack . The fracture energy ( G.)of repaired concrete speci − mens decreased with increasing the E ・ modulus of resin . The GF value of repaired concrete were dld not monotonously increase with increasing compressive strength of concrete , and had a tendency of decrease at low water cement ratio.
The objeCtive of this paper was te darify the ilfiuence of mixed − mod じ load 血 g collditions on the load − dofomation relationships and the craok propagation of netced ooncrete bea皿 specinen . Mixed − mode ioadillg co 皿ditions were made by changing thc distan ffom 血 e load 血 g linc to the notch line of the specimen . Crack propagation of the s ρ edmen was observed and i[ was compared w 壷 〔 h the resUlt of analysis which was based on the linear elastic fraCture mecha 血cs (
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