報告書番号

U89027

タイトル（和文）

高温にさらされる鉄筋コンクリートのせん断伝達特性に関する実験的研究

タイトル（英文）

STUDY ON THE SHEAR TRANSFER OF REINFORCED CONCRETE AT ELEVATED TEMPERATURE

概要 （図表や脚注は「報告書全文」に掲載しております）

本報告は，原子力発電所の原子炉格納容器等の高温にさらされることを想定して設計される鉄筋コンクリート構造物を構造解析する際に必要となる高温下の鉄筋コンクリートのせん断伝達特性を把握することを目的として実施したものである。せん断面に予めひびわれを導入して，鉄筋比・直交応力・温度を試験要因とした一面せん断試験を行った。試験結果を要約すると次の通りである。高温下でのせん断耐力は，常温下よりも１０～２０％低下するが，１００℃と２００℃ではほぼ同じ耐力を示すことが明らかとなり，高温下のせん断耐力の評価式を提案した。高温下では最大せん断荷重時のひびわれ幅・ずれ変位は常温下よりかなり大きくなるがせん断伝達剛性として評価すれば常温下と同じ評価式で表現できることが判った。

概要 （英文）

REINFORCED CONCRETE STRUCTURES IN A NUCLEAR POWER STATION SUCH AS A CONTAINMENT VESSEL AND STRUCTURAL MEMBERS SUPPORTING REACTOR VESSEL ARE DESIGNED ASSUMING THAT THEY MAY BE SUBJECTED TO ELEVATED TEMPERATURE. IN THE DESIGN CODE,IT IS SPECIFIED THAT THE TEMPERATURE OF CONCRETE SHALL NOT EXCEED THE LIMITATIONS AND THERMAL EFFECTS SHALL BE TAKEN INTO ACCOUNT. FLEXURAL BEHAVIOUR OF REINFORCED CONCRETE SUBJECTED TO ELEVATED TEMPERATURE OVER 100DEGREE HAS BEEN INVESTIGATED IN RECENT STUDIES,BUT SHEAR BEHAVIOUR IS NOT YET UNDERSTOOD VERY CLEARLY. SO,IN THIS STUDY,SHEARTEST USING MATTOCK TYPE SPECIMENS WERE PERFORMED TO INVESTIGATE SHEAR BEHAVIOUR OF REINFORCED CONCRETE SUBJECTED TO ELEVATED TEMPERATURE AND EXAMINE THE EXPERIMENTAL DATA. TEST PARAMETERS STUDIED IN THIS PROGRAM ARE REINFORCEMENT RATIO IN SHEAR PLANE,COMPRESSIVE STRESS NORMAL TO SHEAR PLANE AND TEMPERATURE. FOLLOWINGS ARE THEMAIN CONCLUSIONS OBTAINED WITHIN THE LIMIT OF THE EXPERIMENT. 1.THE MAXIMUM SHEAR LOADS OF SPECIMENS HEATED TO 200DEGREE WERE ABOUT 10 20 PERCENT LOWER THAN THOSE AT NORMAL TEMPERATURE,BUT ALMOST EQUAL TO THOSE OF SPECIMENS HEATED TO 100DEGREE. 2.TO EVALUATE THE SHEAR STRENGTH RATIO(MAXIMUM SHEAR STRESS DIVIDED BY SQUARE ROUTE OF COMPRESSIVE STRENGTH OF CONCRETE) AT HIGH TEMPERATURE,THE EQUATION HAS BEEN PROPOSED. 3.THE LATERAL SEPARATION AND SLIP AT THE MAXIMUM SHEAR LOAD INCREASED ACCORDING AS THE TEMPERATURE INCREASED. 4.AT ELEVATED TEMPERATURE UP TO 200DEGREE,THERE IS THE SAME RELATIONSHIP BETWEEN THE INTERFACE SHEAR TRANSFERRIGIDITY AND THE LATERAL SEPARATION AS THAT AT NORMAL TEMPERATURE.

報告者

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