TRUSSED STRUCTURE

PURPOSE:To reduce weight by replacing a part, on which tensile load is imposed, with a round bar brace out of riser beam bundles and diagonal members in trussed structure that support a ceiling part of a house. CONSTITUTION:A triangle frame is formed with a horizontal beam 1 and a right slanted beam 2 and a left slanted beam. There are laid out riser beam bundles 14 to 24 which are vertically installed and braces 4 to 13 inside this frame. As a result when the loads imposed on each slanted beam and the braces are measured, it is found out that only a tensile load is imposed on third riser beam bundles 19 and 13 adjacent to and from the eaves while a compression load is imposed on the other riser beam bundles 14 to 24. Therefore, only the riser beam bundles 19 and 20 are formed with round bar braces. Furthermore, only a tensile load is imposed on the braces 4 to 9 so that they are formed with round bar braces while a compression load is imposed on the other braces 10 to 13 to that they are formed with a shape steel material. It is, therefore, possible to reduce cost and shorten construction time as well.