Capacity of RC Concrete Column with Holes

Rc 유공 콘크리트 기둥의 내력에 관한 실험적 연구

  • Published : 2006.02.28

Abstract

This study is to find out how column with hole is behaved, compared to the normal one without hole. There might be existing buildings to make holes in the reinforced concrete column. Columns are made with commercially used compressive strength $240kg/cm^{2}$, air amount 5.0%, using re-bar of diameter D13 and D10 having yielding stress $4,000kg/cm^{2}$. The specimen were cured with temperature of $21{\pm}3^{\circ}C$. All specimens of five variables and all holes are geometrically considered and configurated. D3, D5 mean diameter 3cm and 5cm respectively. H1, H2 are the number of holes. Compressive pressure was forced in accordance with KS, following $0.6{\pm}0.4N/mm^{2}$ speed. Main re-bar's were strained with almost same shape through all the specimens. Hole diameter 5cm-having specimen showed cracking around hole. strains of back and front gauges of the specimen were showed similarly. Specimen having two holes in left and right from longitudinally axis resisted 7% less than the one having hole centrically from longitudinal axis. One hole having specimen with diameter 5cm resisted only 3% less than in case of 3cm diameter hole. Hole having in left and right from longitudinal axis will be less resistant than the case longitudinally arranged. Diameter 3cm hole showed less 10% capacity than normal one without hole. Capacity loss difference between diameter 3cm and 5cm showed almost none in case that they are arranged longitudinally.

Keywords

column hole;tensile strength;strain;geometrical configuration

References

  1. 장승필, 심창수, 윤석구, '피로하중을 받는 합성보의 휨강성 감소에 관한 실험적 연구', 대한토목학회논문집, 제16권, 제1-4호, pp. 445-454, 1996.7
  2. 권오현, 신장호, '건축구조학', pp. 260-275, 1998.2
  3. Join E Bower, 'ultimate strength of beams with Retangular Holes', ASce, Vol. 94, pp. 1315-1337, 1968.6
  4. Mansur, MoA, 'cornbined Bending and openings', concrete internatimal, pp. 51-58, Nov, 1983
  5. 함성권, '기본 건축구조공학', pp. 302-315, 1995.1
  6. 이상호, 허원석, '적층성을 띤 CFS로 보강된 원형 콘크리트 기둥의 보강효과 해석', 한국콘크리트 학회지, 제11권, 제3호, pp. 89-99, 1999.6