| 摘要 |
<p>A roof structural body using steel materials, capable of providing a necessary strength even if a thickness is small and being connected even if connection members are absent, comprising a lower chord member (18) installed horizontally, an upper chord member (12) having a lower end connected to the lower chord member, and a web member (20) connecting the lower chord material to the upper end of the upper chord material, wherein at least one of the lower chord material, upper chord material, and web material has a structural element having a cross section including three grooves having opening directions different from each other and uniform in longitudinal direction.</p> |
