| 摘要 |
A joint for steel structure, provided with an upper diaphragm (4) combined with a lower surface of an upper column (5), a lower diaphgragm (2) combined with an upper surface of a lower column (1), a connection core (3) having a cross section smaller than that of the upper and the lower diaphragms (4, 2), and a height corresponding to that of a beam (11), and gusset plates (10) disposed between the upper and lower diaphragms (4, 2) and fixed at their circumferential edge portions to at least the connection core (3), combination bolt holes (H) being formed in the upper and lower diaphragms (4, 2) and gusset plates (10). This enables the upper and the lower diaphragms (4, 2) and upper and lower flanges of the beam (11) to be combined together by bolts. Consequently, even when a load not smaller than a design load is imparted to the above-described joint in such a case as attached by a big earthquake it is not suddenly broken unlike a weld zone, i.e., a slip occurs first in a through diaphragm and the beam (11), the joint being thereafter broken due to the ductile breaking of either the flanges of the beam (11) or bolts. Thus, a slip, i.e. deformation occurs in a stage before the occurrence of breakage, so that a load is absorbed in the joint, whereby such a sudden breakage as is encountered in a weld zone can be prevented. This enables a combining structure of a high reliability to be obtained.
|
