스트럿-타이 모델에 의한 개구부를 갖는 깊은 보의 극한강도 예측

Prediction of Ultimate Strength of Concrete Deep Beams with an Opening Using Strut-and-Tie Model

  • 지호석 (LG건설 엔지니어링 부문 토건부) ;
  • 송하원 (연세대학교 토목공학과) ;
  • 변근주 (연세대학교 토목공학과)
  • 발행 : 2001.05.01

초록

In this study, ultimate strength of concrete deep beams with an opening is predicted by using Strut-and-Tie Model with a new effective compressive strength. First crack occurs around an opening by stress concentration due to geometric discontinuity. This results in decreasing ultimate strength of deep beams with an opening compared with general deep beams. With fundamental notion that ultimate strength of deep beam with an opening decreases as a result of reduction in effective compressive strength of a concrete strut, an equivalent effective compressive strength formula is proposed in order to reflect ultimate strength reduction due to an opening located in a concrete strut. An equivalent effective compressive strength formula which can reflect opening size and position is added to a testified algorithm of predicting ultimate strength of concrete deep beams. Therefore, ultimate strength of concrete deep beam with an opening is predicted by using a simple and rational STM algorithm including an equivalent effective compressive strength formula, not by finite element analysis or a former complex Strut-and-Tie Model

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