Joint structure of building using thin and lightweight shaped-steel

Abstract

The present invention provides a joint structure for a building using thin and lightweight shaped-steel, and, in particular, provides a joint structure for fastening and fixing frame members made of thin and lightweight shaped-steel to steel sills and a bolt joint truss structure for forming a main structure of a roof, sufficiently durable against a large earthquake or a strong wind such as a typhoon. A joint structure of a building using thin and lightweight shaped-steel is provided wherein, in a joint portion for fastening a steel frame member for forming a wall to a steel floor sill, a steel reinforcing member having a cross-sectional area in a range from 70 to 100% of a cross-sectional area of the steel frame member is inserted into the joint portion and fixed thereto. Also, a joint structure of a building using thin and lightweight shaped-steel is provided, wherein upper chord members, lower chord members and lattice members of light and lightweight shaped-steel are combined to form a truss structure, wherein a joint portion of the upper chord member, lower chord member and lattice member has at least one joint through-hole, and wherein the joint portions of the respective members are connected together to form a joint and a fastener is inserted into the joint through-hole to fasten and fix the respective members to each other.

What is claimed is:  
     
         1 . A joint structure of a building using thin and lightweight shaped-steel, characterized in that, in a joint portion for fastening a steel frame member for forming a wall to a steel floor sill, a steel reinforcing member having a cross-sectional area in a range from 70 to 100% of a cross-sectional area of the steel frame member is inserted into the joint portion and fixed thereto.  
     
     
         2 . A joint structure of a building using thin and lightweight shaped-steel, characterized in that, in a joint portion for fastening a steel frame member for forming a wall to a steel or concrete base by a bolt, a steel joint plate provided with a bolt through-hole having a diameter 1.5 times that of the bolt or more is inserted into the joint portion and fixed thereto.  
     
     
         3 . A joint structure of a building using thin and lightweight shaped-steel as defined by  claim 2 , characterized in that an additional plate with a bolt through-hole having the same diameter as that of the bolt through-hole of the steel joint member or a diameter slightly larger than the bolt diameter is combined with the steel joint member.  
     
     
         4 . A joint structure of a building using thin and lightweight shaped steel, characterized in that upper chord members, lower chord members and lattice members of thin and lightweight shaped-steel are combined to form a truss structure, wherein a joint portion of the upper chord member, lower chord member and lattice member has at least one joint through-hole, and wherein the joint portions of the respective members are connected together to form a joint and a fastener is inserted into the joint through-hole to fasten and fix the respective members to each other.  
     
     
         5 . A joint structure of a building using thin and lightweight shaped-steel, as defined by  claim 4 , characterized in that a joint gusset in which at least one joint through-hole is provided to be aligned with the joint through-holes provided in the upper chord member, lower chord member and lattice member is attached to the joint portion and then the respective members are fastened and fixed together.  
     
     
         6 . A joint structure of a building using thin and lightweight shaped-steel, as defined by  claim 5 , characterized in that the gusset is a washer having a thickness of 1.6 mm or more.  
     
     
         7 . A steel house made of thin and lightweight shaped-steel, using the joint structure as defined by any one of  claims 1  to  6 .