壁式プレキャスト鉄筋コンクリート構造の鉛直接合部の力学的挙動に関する研究 : その2 既往実験結果の考察

抄録

The test results in the past on Vertical Joint of Box-Frame-Type Precast Reinforced Concrete were considered by method of loading, and their data were compared with A. I. J. code. Each method of loading were characterized. At shear crack formation load, τ_<cr>/jF_c=0.1・ΣA_2/A_1 gives a rough average. But, as concerns cotter bars ratio, it had little to do with the strengths at which shear cracks were produced. And at the relation between τ_<cr> and jF_c, it is provided that allowable unit stress for shearing is 7 kg/cm^2 uniformly in "Design Criteria for Box-Frame-Type Precast Reinforced Concrete Construction". But, recently this construction method tends to progress to taller buildings. Therefore, it may be considered that the value of the allowable unit stress for shearing applies to that of "Criteria for Structual Calculations for Reinforced Concrete", below 1/30 Fc and 5+1/100 Fc. At ultimate load, τ_u/jF_c=0.15・ΣA_2/A_1 gives a rough average. And ascent of cotter bars ratio (P_s, P'_s) contributes to the increase of ultimate shearing unit stress (τ_u). At P_s>0.3 % P'_s>0.6 %, the increase of bearing strength was not recognized. Application of test results and calculated value as seen by method of loading considered as follows. Punching Type ; almost suit S Type ; test result suit about 50 % of calculated value Pure shear Type ; test result suit about 80 % of calculated value Flexure Type ; test result suit about calculated value + 10 kg/cm^2 Horizontal loading Type ; test result suit about calculated value + 10 kg/cm^2