INELASTIC DYNAMIC RESPONSE OF STEEL SPACE FRAMES : Part 1 Single-story, Single-bay Rigid-jointed Space Frames Composed of Columns with H-shaped and Box Section

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Other Title
  • 鋼構造立体骨組の動的弾塑性応答に関する研究 : その 1 H 形断面柱および箱形断面柱から成る 1 層 1 スパン剛接立体骨組
  • 鋼構造立体骨組の動的弾塑性応答に関する研究-1-H形断面柱および箱形断面柱から成る1層1スパン剛接立体骨組
  • コウ コウゾウ リッタイ ホネグミ ノ ドウテキ ダンソセイ オウトウ ニカン

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A Structure according to current seismic design will undergo deformations well into the inelastic range when subjected to a strong earthquake. In addition, the ground motion during an earthquake is represented by two horizontal and one vertical components. For frame structures, it becomes important to investigate the response to the three components of ground motion acting simultaneously. In this paper, an analytical method for the inelastic dynamic response of steel space frames is presented. The method assumes that a column segment consists of uniaxially stressed fibers along its length. The responses of single-story, single-bay space frames subjected to simultaneous action of two horizontal components of sinusoidal ground acceleration are studied using lumped mass, rigid-floor idealization. The center of resistance coincides with the center of mass in the space frames at initial elastic state. Some of the significant aspects of the results are summarized as follows; 1) Torsional deformation of each column with H-shaped section of which axial force ratio is less than 0.3 and slenderness ratio is greater than 20 scarcely affects the responses of the space frames. On the other hand, torsional deformation of each column with box section have a considerable effect on the responses of the space frames, particularly on the torsional response. 2) The responses of the space frames composed of columns with H-shaped section are greater than those of the plane frames. On the contray, the responses of the space frames composed of columns with box section are nearly identical with those of the plane frames. 3) The torsional responses of the space frames significantly depends on the phase difference between two components of sinusoidal ground acceleration. Especially, the torsional response of the space frames composed of columns with H-shaped section is more influenced by the phase difference than those composed ofcolumns with box section.

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