側柱柱脚実験と浅い埋込み柱脚耐力・剛性評価 : 浅い埋込み柱脚の弾塑性挙動と保有性能その3

概要

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This paper is a continuation of two previous papers that deals with the development of shallow-embedded column bases used in construction of steel buidlings. Behavior of exterior column bases was examined experimentally, with the slab thickness, degree of varying axial force, and reinforcement detail as test variables. It was found that both the strength and stiffness of exterior column bases differ between the positive and negative loading, and those in the negative loading are significantly smaller because the column compressive axial force decreases and the cover concrete to prevent the uplifting the base plate is absent. An analytic procedure to estimate the elastic stiffness of shallow-embedded column bases is proposed, in which resistance provided by concrete in bearing and that provided by concrete to prevent the uplifting of the steel base plate are allowed for. The procedure is found to be reasonable in light of the corresponding test results. An analytic procedure to estimate the strength of exterior column bases and its effectiveness are also presented.
2009-01-30