鋼構造筋違付多層骨組の塑性設計に関する研究 : その 3・塑性設計された筋違付 3 層 3 スパン骨組の弾塑性履歴性状に関する実験的研究

抄録

Experimental results of 3 story 3 bay braced and unbraced frames under monotonous or alternating horizontal forces are shown in this paper. The test program consist of four specimens. Two of them are braced frames and other two are unbraced frames. Both braced and unbraced frames are designed against the same factored horizontal forces, and individual members are processed to have a net strength. Test frames are subjected to horizontal forces which are proportional to design forces at each floor level. It is generally observed the force-deflection curves do not differ remarkably from the test results which have been presented by many investigators. As to the braced frames, bracing members of the lowest story which has the smallest ratio of story shear-force shared by bracings to total shear force buckle and yield at the outset, so the relative story displacement of the lowest story increases before buckling and yielding develope in all other bracing members. After this, however, the relative story displacement of each story increases uniformly. This result suggests that the bracing members should be designed so as to buckle or yield simultaneously against seismic force. Further, experimental force-deflection curves are well predicted by generalized hardening hinge method.