センザイコウゾウブツ ノ ソセイカンショウ オ トモナウ ホウカイ キョドウ ニ カンスル リロンテキ ケンキュウ

京都大学0048新制・論文博士工学博士乙第3087号論工博第901号新制||工||348(附属図書館)UT51-51-K80(主査)教授 横尾 義貫, 教授 金多 潔, 教授 若林 実学位規則第5条第2項該当Kyoto UniversityDFA

An Experimental Study on the Inelastic Behavior of Steel Frames with a Rectangular Cross-Section Subjected to Vertical and Horizontal Loading

An experimental study was made of the behavior of single bay three-storied frames, using 1/30-scale models with rectangular cross-sections. Frame models were cut from a sheet of mild steel. A varying horizontal force and constant vertical loads were applied at the top of columns. The horizontal force-displacement relations show the remarkable dependence of frame behavior on the existence of vertical loads ; the behavior is characterized by a gradually increasing lateral displacement, first under a growing load and later under a diminishing load, the slope continuously decreasing in the horizontal force-displacement relation. Elastic-perfectly plastic type of analysis underestimated the restoring force in the large deformation range. An approximate elastic-strain hardening analysis was attempted in order to gain access to the real behavior of frames, and a reasonable agreement is seen with the experimental results

On the Buckling Strength of Angles in Transmission Towers

It is assertained that buckling or instablility of angles has been the main cause of destruction of the super-structure of transmission towers due to typhoons. Experimental studies are made of buckling strength of angles, using structural steel with a L-90 mm×90 mm×7 mm profile. Various eccentricities and slenderness-ratios are included. Behavior and modes of buckling failure are observed. Test results are compared with buckling theories, and a general consensus is reached between them. As an approach for safe and economical design of steel transmission towers, safety factors are examined for actual angle members based on the experimental results of the carrying capacity. Revision of JEC allowable stress is proposed

An Experimental Study on the Inelastic Behavior of Steel Frames Subjected to Vertical and Horizontal Loading

An experimental study was made of the behavior of single bay, one- and two-storyed frames, using mild steel models with wide flange sections. A varying horizontal force was applied at the top of a frame model under a constant vertical load on the columns. From the horizontal force-displacement relation, a considerable reduction was observed in the restoring force due to the column loads, indicating the importance of the unstable character due to dead loads on the horizontal restoring force in tall buildings. In general the experimental results show more favourable behavior for a large deformation than the elastic-perfectly plastic theory predicts and a rough estimation of the strainhardening effects accounts for this behavior in a reasonable way

Experimental Studies on the Large Plastic Deformation of Frames Due to Horizontal Impact -Measurements of Impact Loading and Vertical Load Effect

An experimental study is made on the nature of the large permanent deformation of the columns in a portal frame under horizontal impact loading. The column specimens were made of mild steel, aluminum alloy and copper plates. The impact load was applied by an input pendulum. The applied load and initial velocity were measured by the barium titanate ceramics, accelerometer and load cell which had been calibrated beforehand from the initial amplitude of a bifilar pendulum. The experimental results show a reasonable consensus with the analysis in which the frame restoring-force characteristics are approximated as bi-linear with a negative second slope