Abstract
This paper is the continuity of the previous paper written by the author in Transactions of Architectural Institute of Japan, No.126, in August 1966. In this paper, in order to prevent the lateral buckling in testing a specimen constructed of the same two welded steel trusses, adapted the T-structural shape for their chord members, the steel tube for their web members and the eccentric panel points to make the construction of their panel points as simple as possible, was tested to find their strength and rigidity in the elastic and plastic behaviors. And the results of this test are discussed in comparison with the results of the elastic and plastic theoretical analysis, in which the second stresses for the welded steel trusses are considered and the plastic hinge theorem based on several assumptions is applied. The results are as follows. 1) The yield load of the specimen in this test was nearly 23 tons and for larger loads than the yield one its rigidity was observed to decrease remarkably. And the above mentioned elastic and plastic behaviors of the specimen were found to nearly satisfy the results of this theoretical analysis. Especially the elastic and plastic behaviors of the specimen in the process of its load becoming the yield one were sufficiently explained by this theoretical anailsis. And the yield load of the specimen, owing to the plastic hinges formed in its web members and the yielding of its lower chord member due to the tensil axial force and bending moment, was found to correspond to the limited load in which the specimen should lost most of the organization of the welded steel trusses and its upper chord member should begin to act as a beam. However, the rigidity of the specimen for larger loads than the yield one was found to become larger than that of this theoretical analysis. 2) The dameges to the panel points of the specimen could not be observed until its breaking load due to the buckling of its compressive web member.
