H形鋼を用いた軸組筋かい材端接合部の力学的性状

抄録

As the resistant elements of large-sized steel structures against earthquake, K-type or X-type braces of wide flange steels are commonly used. Many kinds of details of such brace connections are designed, but the statical characteristics are not made clear enough. Therefore, in order to make clear the statical characteristics of high strength bolted connections of wide flange steel braces, experimental study on such connections was carried out. In this expriment four types of typical brace connections (J1-J4 type, see Fig.2) were tested. The specimens were designed in three strength level, but every specimen was designed to satisfy the condition that its connection does not break before full yielding of connected brace member. The results of this experiment are discussed in this paper. The main conclusions are summarized as follows. The degree of restraint of the connection on the axially loaded buckling behavior of the connected member and the fracture mode of the connection are different from each other, according to the type and strength level of the connection. But, in case that the connection is designed so strong that the slip strength of high strength bolts is larger than the yield strength of connected member based on gross sectional area, such difference between the connections is very small. In general, the statical characteristics of J3 type connection are superior, because both flange of brace member are connected directly to two gusset plates. The statical characteristics of J4 type connection are inferior, because the mechanism of stress transfer at the connection is too complicated. The statical characteristics of J1 type and J2 type connection are good enough, when the connection is designed properly.