earticle

영어

As the structural design method has been changed from the elastic strength design method to the ultimate strength design method, the number of shear reinforcing bars increased greatly. In this paper, we propose a method of arranging a large number of legs into two. With this method, we analyze the Workability & Economic Efficiency, economic feasibility, and inner force of the main bars and concluded as follows. First, 3 ~ 6 legs of shear reinforcement may show no problem in the drawing, but when the upper bar concentrated at the end of the beam is complex, the 90° & 135° hook must anchor the upper and lower reinforcement bars. This method needs to be improved because various expedient have occurred due to poor constructability and poor workability for hanging a 90 ° hook on the upper bar by hooking the lower bar upward. Second, by reorganizing the existing number of shear reinforcing bars into two and arranging them, and therefore by drastically reducing the total installation work, the amount of rebar can be reduced by up to 26%. Third, by developing a simplified detail and using D10 / 2 section on the lower bar, an increase in the bending strength of the girder was found to occur 10~24%.