ON THE STRENGTH OF BEAMS WITH CIRCULAR HOLES AND A DESIGN METHOD : Part-1 Non-reinforced Holes

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  • 円形孔を有するはりの耐力と設計法 : 1. 無補強の場合の耐力
  • エン カタアナ オ ユウスル ハリ ノ タイリョク ト セッケイホウ 1 ム

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Abstract

On the economical viewpoint, such design method is frequently adopted to minimize the story height of buildings that holes are provided in web plates of beams for ducts or pipes to be passed through. In Japan, most of the shapes of the holes are circular. But, the method to calculate the strength of such beams is not established yet. In this paper, a method to calculate the strength of beams with non-reinforced circular web holes is proposed. The calculated results by the proposed method are compared with test results and it is assured that the proposed method can predict the strength of such beams. The summary concerning to the strength of such beams is as follows. 1) The shearing strength is about 85% of the full plastic shearing strength of the web net section area. 2) The bending strength is about 92% of the full plastic moment of its flange plates. 3) In case of a beam subjected to shearing force and bending moment simultaneously, its strength can be computed by a interaction curve of bending strength and shearing strength. 4) Because the shape of the interaction curve is neary rectangular, the bending strength and shearing strength can be checked independently, when a beam is subjected to shearing force and bending moment simultaneously in a practical design.

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