Abstract
A new type connecting method using vertical stiffeners for WF beam-to-RHS column connections was developed. The vertical sttifners were welded to the both sides of flanges of the beam ends, and the ends of the stiffeners were welded to the corners of RHS columns. The basic statical characteristics of this type connections were already investigated experimentally using T-shaped specimens. In this test series a effective area of the panel zone under severe cyclic loading are investigated experimentally using cruciform specimens. The panel strength ratio Rpp(pMp/Min(ΣbMp, ΣcMp) were designed less than 1. It becomes clear that the maximum strength and plastic deformation capacity of this type connections certified to be enough even if the yeild strength of panel zone was considerably smaller than that of column or beam members. In case every part of this type connection is designed appropriate the welding parts at the corners of RHS column work well. The effective volume of the panel zone are nearly 10% lager than that of usual beam-to-column connections.
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