Abstract
In our country, most of shapes of holes in web plates of beams are circular and they are reinforced by sleeve pipes or double plates or others. Funahashi et al. reported that it was recognized experimentally that sleeve pipe reinforcing is little effective and the most effective method is double plate reinforcing. But sleeve pipe method is used most frequently in practice. The reason is considered that sleeve pipe method is more economial than double plate reinforcing, due to shortening of weld length, in spite of increase of volume of steel. But, the method to design beams with circular holes is not established yet and therefore it is desired that a design method is proposed. In America, the design method for beams with rectangular holes non-reinforced or reinforced by horizontal stiffeners is established. But, it is difficult to utilize it to design of beams with circular holes. In part-1, a method to analyze the strength of beams with non-reinforced circular holes was proposed. In this paper, the effect of sleeve pipe reinforcing is shown experimentally, and a method to analyze the strength of beams with sleeve pipe reinforced holes. Comparing the analyzed results to the experimental results, it is shown that the propos-ed method can predict appropriate values.
