EFFECT OF AUTOGENOUS SHRINKAGE OF ULTRA HIGH-STRENGTH CONCRETE ON BENDING BEHAVIOR OF REINFORCED CONCRETE COLUMN

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  • 超高強度コンクリートの自己収縮がRC柱の曲げ性能に及ぼす影響に関する考察
  • チョウコウキョウド コンクリート ノ ジコ シュウシュク ガ RCチュウ ノ マゲ セイノウ ニ オヨボス エイキョウ ニ カンスル コウサツ

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Abstract

In this research, fiber model, which is able to take account of volume change of concrete, is proposed. And using the proposed fiber model, bending behavior of reinforced concrete (RC) column with ultra high-strength concrete is simulated with parameters of axial force ratio, reinforcement ratio, yielding stress of rebar, and the amount of autogenous shrinkage. As a result, autogenous shrinkage make the very small difference in maximum bending moment of RC column, and the autogenous shrinkage affect much on the curvature at the yielding of compressive rebars, slightly on the curvature at the yielding of tensile rebars, and on the point which compressive core concrete attains the ultimate bending strain. Therefore, in the case of allowable stress design, reinforced ultra-high strength column is allowed only for very small external moment. But according to the results of numerical analysis, compressive yielding of reinforcement will not affect much on the performance of RC column when the combined stress of reinforcements of sustained loading with the stress produced by autogenous shrinkage is under allowable stress for sustained loading.

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