Column-and-beam join structure

Abstract

The present invention provides a column-and-beam join structure which absorbs energy caused by a large earthquake or the like by split tees surely yielding at a prescribed value, does not cause other members to fracture, and thus makes it possible to replace only the split tees which have become unusable, and, more specifically, a column-and-beam join structure constructed by attaching and connecting, using bolts 9 , the ends 8 a of both the upper and lower flanges 8 of a steel beam (H-shaped steel beam) 7 between the webs 6 of a pair of upper and lower split tees 4 the flanges 5 of which are connected to a steel column 1 using bolts 3 . The upper limit of the yield stress of the steel material used for the split tees 4 is defined to be not more than twice the lower limit thereof. Further, in order for the web 6 extending from the flange 5 of a split tee 4 in the axial direction of an H-shaped steel beam 7 to absorb earthquake energy by its plasticization, the cross-sectional area of the web 6 is reduced partially and the base end portion 6 a of the web 6 is divided from the tip portion 6 b which is connected to the flange 8 of the H-shaped steel beam 7.

1 - 7 . (canceled).  
     
     
         8 . A column-and-beam join structure fabricated by connecting the flanges of split tees to a steel column using bolts and by engaging and connecting the webs of the split tees to the ends of the flanges of a steel beam using bolts, characterized in that: the upper limit of the yield stress of the steel material used for either one or both of the web and the flange of a split tee is defined to be not more than twice the lower limit thereof; and, at a portion where both ends of the flange of the split tee are connected to the steel column using bolts, space keeping members are inserted between the flange of the split tee and the steel column and the flange of the split tee and the steel column are connected in the state of maintaining the space.  
     
     
         9 . A column-and-beam join structure according to  claim 8 , characterized in that a split tee has a shape wherein the cross-sectional area of the flange is partially reduced.  
     
     
         10 - 13 . (canceled).  
     
     
         14 . A column-and-beam join structure fabricated by connecting the flanges of a pair of upper and lower split tees to a steel column using bolts, by engaging and connecting both the upper and lower flanges of a steel beam between the webs of both the upper and lower split tees using bolts, and by molding a concrete slab to either one of both the upper and lower flanges of the steel beam, characterized in that: the yield stress of the steel material used for the flange of the split tee, to which the flange of the steel beam where the concrete slab has been molded is connected, is defined to be higher than the upper limit of the yield stress of the steel material used for the flange of the other split tee; the upper limit of the yield stress of the steel material used for the flange of the other split tee is defined to be not more than twice the lower limit thereof; and, at a portion where both ends of the flange of the other split tee are connected to the steel column using bolts, space keeping members are inserted between the flange of the split tee and the steel column and the flange of the split tee and the steel column are connected in the state of maintaining the space.  
     
     
         15 . A column-and-beam join structure according to  claim 14 , characterized in that the other split tee has a shape wherein the cross-sectional area of the flange is partially reduced.  
     
     
         16 . A column-and-beam join structure fabricated by connecting the flanges of a pair of upper and lower split tees to a steel column using bolts and by engaging and connecting both the upper and lower flanges of a steel beam between the webs of both the upper and lower split tees using bolts, characterized in that: the upper limit of the yield stress of the steel material used for the flange of one of the upper and lower split tees is defined to be not more than twice the lower limit thereof; at a portion where both ends of the flange of the split tee are connected to the steel column using bolts, space keeping members are inserted between the flange of the split tee and the steel column and the flange of the split tee and the steel column are connected in the state of maintaining the space; and the yield stress of the steel material used for the flange of the other of the upper and lower split tees is defined to be higher than the upper limit of the yield stress of the steel material used for the flange of the former split tee.  
     
     
         17 . A column-and-beam join structure according to  claim 16 , characterized in that the former split tee has a shape wherein the cross-sectional area of the flange is partially reduced.  
     
     
         18 . A column-and-beam join structure fabricated by connecting the flanges of split tees to a steel column using bolts and by engaging and connecting the webs of the split tees to the ends of the flanges of a steel beam using bolts, characterized in that: the upper limit of the yield stress of the steel material used for either one or both of the web and the flange of the split tee is defined to be not more than twice the lower limit thereof, the split tee has a shape wherein the cross-sectional area of the flange is partially reduced; and, both ends of the flange of the split tee and the steel column are connected by using bolts.  
     
     
         19 . A column-and-beam join structure fabricated by connecting the flanges of a pair of upper and lower split tees to a steel column using bolts, by engaging and connecting both the upper and lower flanges of a steel beam between the webs of both the upper and lower split tees using bolts, and by molding a concrete slab to either one or both the upper and lower flanges of the steel beam, characterized in that: the yield stress of the steel material used for the flange of the split tee, to which the flange of the steel beam where the concrete slab has been molded is connected, is defined to be higher than the upper limit of the yield stress of the steel material used for the flange of the other split tee and the upper limit of the yield stress of the steel material used for the flange of the other split tee is defined to be not more than twice the lower limit thereof, the split tee has a shape wherein the cross-sectional area of the flange is partially reduced; and, both ends of the flange of the split tee and the steel column are connected by using bolts.  
     
     
         20 . A column-and-beam join structure fabricated by connecting the flanges of a pair of upper and lower split tees to a steel column using bolts and by engaging and connecting both the upper and lower flanges of a steel beam between the webs of both the upper and lower split tees using bolts, characterized in that: the upper limit of the yield stress of the steel material used for the flange of one of the upper and lower split tees is defined to be higher than the upper limit of the yield stress of the steel material used for the flange of the other split tee and the upper limit of the yield stress of the steel material used for the flange of the other split tee is defined to be not more than twice the lower limit thereof, the split tee has a shape wherein the cross-sectional area of the flange is partially reduced; and, both ends of the flange of the split tee and the steel column are connected by using bolts.