X型制振ブレース付剛節架構の機構と弾塑性性状について : その2 せん断接合型ブレース架構

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  • ON MECHANISM OF X-BRACED FRAME WITH HYSTERETIC DAMPER AND ITS ELASTO-PLASTIC BEHAVIOR : Part 2 Shear connected braced frame
  • Xガタ セイシン ブレース ツキ ゴウセツカコウ ノ キコウ ト ダン ソセイ セイジョウ ニ ツイテ ソノ 2 センダン セツゴウガタ ブレースカコウ

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In the previous paper, the present authors showed a tension connected braced frame with the hysteretic damper and confirmed that the hysteretic damper prevents the brace buckling, even if the brace has relatively large slenderness ratio, so that the repeated large drift of the frame causes no hysteresis loop deterioration of the damper. In this paper, a more simplified shear connected braced frame with the hysteretic damper, from view point of practical use, is proposed. In order to verify the mechanism of the present frame and clarify the sectional properties required of the brace member, the cyclic loading tests. F.E.M. analyses, and parametric studies using the simple structural model on one story - one bay braced frames with the damper are performed. From these studies, the following results are obtained. 1) By installing the damper in the shear connected braced frame, the maximum compressive axial force acting on the brace, is less than the elastic limit strength of the damper. 2) If the brace has the flexural rigidity, for its buckling load to surpass the elastic limit strength of the damper, and the sectional area for its full plastic axial force to surpass the maximum strength of the damper, the braced frame with the damper is to have excellent characteristics in plastic deformation and energy absorption capacity as a hysteretic damper.

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