BUILDING STRUCTURE HAVING ROOF FRAME STRUCTURE

To prevent a construction period from getting long while effectively suppressing oscillation of a roof frame structure overhanging in a cantilever beam state, and to achieve effective use of a space.SOLUTION: A building structure 1 includes: a lower structure part 10 comprising a plurality of pieces of lower floor columns 11 constructed on a foundation 6 and lower floor beams 12 stretched between adjacent lower floor columns 11 and having a rigid-framed structure; and an upper structure part 20 provided above the lower structure part 10, and having a cantilever beam state roof frame structure 30 in which a base end part is made to be a fixed end and in which a tip part extends laterally from the base end part and is made to be a free end. The lower structure part 10 has a flexible structure in which rigidity is lower than that in the upper structure part 20.SELECTED DRAWING: Figure 1 【課題】片持ち梁状に張り出した屋根架構の揺れを効果的に抑えつつ、施工の長期化を抑え、スペースの有効利用を図る。【解決手段】建築構造物１は、基礎６上に構築された複数本の下層階柱１１、および互いに隣り合う下層階柱１１の間に架設された下層階梁１２からなるラーメン構造の下部構造部１０と、下部構造部１０の上方に設けられ、基端部が固定端とされ、先端部が基端部から側方に延びて自由端とされた片持ち梁状の屋根架構３０を有した上部構造部２０と、を備え、下部構造部１０は、上部構造部２０よりも剛性が低い柔構造である。【選択図】図１