1994 Volume 1 Issue 1 Pages 155-164
Most of steel beams of buildings have openings in their webs to be penetrated by duct pipes. The scales and positions of openings are decided, according to the equipmental requirement and the structural design is done respectively. When beams with so many and large openings as possible and the design method are prepared, it is very useful for equipmental planning, structural design and fabrication of steel members. On this point of view, beams with many and large rectangular openings in their webs are fabricated and the full-scale test is carried out to investigate their stiffness and strength and a simple method to calculate their allowable strength and deformation is proposed.