| 摘要 |
PROBLEM TO BE SOLVED: To provide a non-bracket method eliminating redundant steel and reducing the cost by using a steel beam with a level difference which is made by assembling existing shape steels like an existing wide flange beam (H-steel), an existing I-shaped steel of different sizes. SOLUTION: The existing wide flange beam 2 having a larger beam depth is connected to each of both ends of the existing wide flange beam 1 having a smaller beam depth so that upper surfaces of upper flanges 1a, 2a of them are made flush. Further, a reinforcing rib 3 is arranged on a web 2c of the existing wide flange beam 2 having the larger beam depth in the position corresponding to a lower flange 1b of the existing wide flange beam 1 having the smaller beam depth, so that the steel beam A with the level difference, in which the beam depth of the center is different from that of the ends, is formed. By joining each of both ends of the steel beam A having the level difference to a column steel frame B at the construction site, the column-beam frame which generates a plastic hinge (a) at the level difference section is constructed. COPYRIGHT: (C)2011,JPO&INPIT |
