STUDY ON ULTIMATE LIMIT OF STEEL ROOF TRUSS AT NUCLEAR POWER PLANT

In the seismic safety evaluation of the nuclear power plant, the reasonable specification of the limit performance is required.The purpose of this study is to clarify the limit performance of large span roof truss at nuclear power plant, for advanced evaluations. First, in this study, the static loading test of large-scale specimens, that imitate real roof truss, is done. Then, behavior and deformation capacity of roof truss in large deformation area are examined. And by analytical method, the correspondence of the damage of truss member and whole behavior is confirmed. In addition, a useful evaluation method of ultimate limit of roof truss is proposed, and the validity of proposed method is confirmed by the test evaluations of some roof truss models.