The H-shaped beams reinforced by the horizontal stiffeners at the beam end can be expected improvements in the plastic deformation capacity. The purpose of this paper is to show plastic deformation capacity of the H-shaped beams and to clarify the optimal stiffener shape. For this purpose, authors conduct cyclic loading tests on the several parameters ( length of the beam, thickness of the web and length, width and thickness of the stiffener ), and confirm the distinction of plastic deformation capacity related to the stiffener shape. Furthermore, in addition to the loading tests, by using the numerical analysis and the energy method, authors fix the required rigidity and the required length of stiffeners according to the demanded performance.
We developed a boiling bubble resonator (BBR) as a new heat transfer enhancement method aided by boiling bubbles. The BBR is a passive device that operates under its own bubble pressure and therefore does not require an electrical source. In the present study, high-speed visualization of the flow motion of the microbubbles spouted from a vibration plate and the plate motion in the BBR was carried out using high-speed LED lighting and high-speed cameras; the sounds in the boiling chamber were simultaneously captured using a hydrophone. The peak point in the spectrum of the motion of the vibration plate and the peak point in the spectrum of the boiling sound were found to be matched near a critical heat-flux state. Therefore, we found that it is important to match the BBR vibration frequency to the condensation cycle of the boiling bubble as its own design specification for the BBR.
In this paper, the new rational design method of the stiffeners arranged in one-side of the steel plate shear wall is proposed. The purpose of this study is to directly estimate plastic buckling strength and plastic deformation capacity by using the width-thickness ratio β normalized by yield strength and elastic buckling coefficient. The relationship between β and plastic deformation capacity is formulated based on the results of FEM analysis. In addition, the effects of the cyclic loading and surrounding frame members are revealed by experimental tests. It is indicated that the proposed method enable to design the stiffeners more rationally.
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