高強度鉄筋コンクリートの研究 : 大型梁の破かい実験報告

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タイトル別名
  • 2) EXPERIMENTAL STUDY OF THE FULL-SIZED REINFORCED CONCRETE BEAMS SUBJECTED TO THE ALTERNATE LOADING
  • 高強度鉄筋コンクリートの研究
  • コウキョウド テッキン コンクリート ノ ケンキュウ

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抄録

This paper presents the results of the bending tests of full-sized reinforced concrete beams, reinforced with either of the three kinds of reinforcing bars, i.e. plain bars, high strength deformed bars and high strength cold twisted bars (pt=0.54%). Tests were carried out by alternate loading or by one-way loading (loading and unloading). The load to the simply supported beams was applied at one point or at two points. Summing up the results of this experiment, it was found that: 1) The strength of each beam is estimated by plastic theory. 2) Compared to beams with the plain bars, the yield strength and ultimate strength of the beams with high strength deformed bars increase in proportion to the ratio of the yield point of the deformed bars to that of the plain bars. 3) The ultimate strength of the beam with plain bars is ordmally estimated by their yield points. But as to the beam with coldtwisted bars, the ultimate strength is decided by the value of their tensile strength. 4) Wether the load to the beam was applied at one point or at two points, its yield moment and maximum bending moment are not affected by their loading method. 5) Whether tests were carried out by one-way loading or by alternate loading, its yield moment was almost same. But the maximu bending moment was somewhat smaller by alternate loading than by one-way loading. 6) In case of one-way loading, the load-deflection curve can be figured out by elastic-plastic theory. 7) For unloading-deflection curve, the ratio of the rigidity of the beam to theoretical elastic rigidity, according to the increasing of deflection, went down after yielding from 0.34 to 0.17.

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