釘接合部の構造減衰並びに剛性に関する研究

Abstract

A theoretical study of the structural damping and stiffness in nailed joints hasbeen made. The analysis is based on a hypothetical mechanism of a nailed joint.The structural damping is discussed in terms of the specific damping capacity, andthe stiffness is expressed by a "backbone" curve. The theoretical results indicatethat the main sources of damping are the friction between frame and sheet and theplastic yielding of the wood in the neighborhood of the nails.Experimental investigations of the damping and the "backbone" curve of singlenaild joints as well as of simple composite nailed structures have been made. Testresults have been found to check favorably with the theoretical analysis; theyshow that the load-distortion and energy loss-distortion characteristics of compositeframed panels can be predicted with reasonable accuracy whenever their loadingconditions are prescribed and the characteristics of one nailed joint is known.