다이아그리드 구조시스템을 적용한 장방형 고층건물의 구조설계에 관한 연구

Abstract

In this study, lateral behavior in high-rise rectangular building with diagrid structural system was evaluated. 60-story buildings with two different plan ratio were analyzed. The main parameters in this study are the variation of the diagrid angle and the size change of diagonal member from web frame and flange frame. The finding of this study is as follows:

1) Optimal angle of diagonal member in rectangular plan was about 70°, which is similar to the previous study for buildings with square plan. It was found that the diagrid angle that becomes gradually steeper towards the base of the building was more economical than uniform angle configuration. In this study, a building with 70° angled diagrid member at 20~40 story was the most economical.

2) As members at 1~20 story were deformed mostly by bending, increasing member size from flange frame was effective in the control of lateral deflection. In the meanwhile, increasing member size from web frame was effective because members at 40~60 story were deformed mostly by shear.

3) When P1 models compared with P1UA4 that the most efficient motion, it was found that P1VA3, P1VA5, P1SC7 models have less diagrid member connection than other models. When P2 models compared with P2UA3 that the most efficient motion, it was found that P2VA2, P2VA3, P2VA5, P2SC7 models have less diagrid member connection than other models.

4) Shear lag factor of all models studied here was all within allowed range. As uniform angle of diagonal member increases, it was found that the shear lag factor was reduced. As diagrid angle configuration becomes gradually lower toward upper portion of a building, shear lag factor was increased. The shear lag factor was reduced by increasing diagonal member size from flange frame at 1~20 story, whereas it was increased by an increase of diagonal member size from web frame at 1~20 story. The Shear lag factor was rarely influenced by the size change of diagonal member at 20~60 story.

5) In respect to steel tonnage of diagrid members and the number of connection between diagrid members, P1SC7 model that was changed the size of diagonal member was the most economical design in P1 model. And P2VA3 and P2VA5 models that were changed angle configuration were the most economical design in P2 model.