EXPERIMENTAL STUDY ON COLLAPSE BEHAVIOR OF WEAK-BEAM PLANAR FRAME SUBJECTED TO REPEATED HORIZONTAL LOADING

摘要

Growth phenomena of bow-shaped deformation mode in multistory multibay weak-beam-type planar frames has been predicted by sym-metry limit theory and equilibrium path bifurcation theory.To verify hte validity of hte theoretical prediction of the bow-shaped mode appearance,static and dynamic loading tests on the 3-story 1-span miniature model frame of weak-beam-type have been carried out.In the previous article.Part I,th eresults of the static loading tests were presented.The prediction method for the bow-shaped mode appearance was verified and the characteristics of the collapse behavor of the frame under repeated loading were clarified.In the present article,Part II,hte results of dynamic loading tests are presented. The dynamic collapse process of the frame including bow-shaped mode appearance and the drift of vibation center is examined in detail through the comparison of the results of the test specimens under various loading conditions.The validity of the two prediction mehthods fort the bow-shaped mode appearance and the drift appearance in sway-mode vibration center is verified.