報告書番号

384035

タイトル（和文）

高温下における鉄筋コンクリートはり部材の耐力・変形性状

タイトル（英文）

MECHANICAL BEHAVIOURS OF REINFORCED CONCRETEMEMBERS AT ELEVATED TEMPERATURES UP TO 500 DEGREES CENTIGRADE

概要 （図表や脚注は「報告書全文」に掲載しております）

当所では，重点課題の一つとして「タンク型高速増殖炉の実用化研究」を進めている。本研究はその中の１研究課題として実施しているもので，炉容器の周辺支持構造（キャビティ），二次系ナトリウムの配管が設置される部位等，高温に曝される鉄筋コンクリート構造物の設計法の合理化に資することを目的としている。本報告は，常温から５００℃までの温度条件下において鉄筋コンクリートはり部材の曲げ破壊実験を行った結果を取りまとめたものである。すなわち，昇温過程における鉄筋コンクリート部材の変形挙動，載荷に伴う変形性状および終局耐力について，常温下における場合と比較することにより，高温下における挙動特性を明らかにしたものである。

概要 （英文）

THE EXPERIMENTAL STUDY WAS PLANNED IN ORDER TO INVESTIGATE THE PHYSICAL PROPERTIES OF CONCRETE AS WELL AS MECHANICAL BEHAVIOURS OF REINFORCES CONCRETE MEMBERS AT ELEVATED TEMPERATURES AND TO HELP ESTABLISH THE DESIGN METHOD OF TEMPERATURE STRESS OF RC STRUCTURES,SUCH AS THE SUPPORT MEMBERS OF REACTOR VESSEL,THE COLUMN,THE BEAMAND THE SLAB MEMBERS,WHERE THE PIPES ARE ARRANGED TO CIRCULATE LIQUEFIED SODIUM OR THE BOILING WATER,IN FAST BREEDER REACTOR TYPE NUCLEAR POWER PLANT. THIS REPORT DISCUSSES THE RESULTS OF FLEXURAL TESTS OF REINFORCED CONCRETE MEMBERS,IN WHICH THE INFLUENCES OF ELEVATED TEMPERATURES ON MECHANICAL BEHAVIOURS OF REINFORCED CONCRETE MEMBERS WERE INVESTIGATED IN COMPARISON WITH THOSE AT NORMAL TEMPERATURE. MAIN CONCLUSIONS OBTAINED FROM THE EXPERIMENTS WERE AS FOLLOWS. YIELD STRENGTH OF RC MEMBERS AT ELEVATED TEMPERATURES IS ABLE TO BE ESTIMATED BY THE CONVENTIONAL CRACKED SECTION THEORY,TAKING ACCOUNT OF THE TEMPERATURE DEPENDENCES OFPHYSICAL PROPERTIES OF CONCRETE AND REINFORCEMENT. THE CALCULATED RESULTS OF ULTIMATE STRENGTH OF RC MEMBERS AT ELEVATED TEMPERATURES BASED ON THE DRAFT OF LIMIT STATE DESIGN OF RC STRUCTURES,WHICH IS DRAFTED BY JAPAN SOCIETY OF CIVIL ENGINEERS,AS WELL AS THE ASSUMPTION OF THE ELAST-PLASTIC RELATIONSHIP BETWEEN STRESS AND STRAIN IN REINFORCEMENT, SHOW CONSERVATIVE VALUES. THE ULTIMATE ANALYSIS OF FLEXURAL RC MEMBERS, IN WHICH THE STRESS-STRAIN RELATION IN THE LARGE DEFORMATION RANGE OF REINFORCEMENT IS TAKEN INTO ACCOUNT,SHOULD BE ESTABLISHED TO ESTIMATE THE ULTIMATE STRENGTH AND DEFORMATIONAL CAPACITY ACCURATELY.

報告者

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