DESIGN METHOD OF BUILDING STEEL STRUCTURES FOR REUSE

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  • FUJITA Masanori
    Dept. of Architecture and Building Engineering, Faculty of Eng., Kanagawa Univ.,
  • YOSHIOKA Rei
    Graduate School of Sciences and Technology for Innovation, Yamaguchi Univ.
  • NAKAZAWA Syoji
    Dept. of Architecture and Civil Engineering, Toyohashi Univ. of Tech.
  • KATO Shiro
    Toyohashi Univ. of Tech.

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Other Title
  • リユース部材を用いた鋼構造建物の設計法に関する研究
  • リユース部材を用いた鋼構造建物の設計法に関する研究 : 桁方向ブレース構造の耐震性能評価
  • リユース ブザイ オ モチイタ コウ コウゾウ タテモノ ノ セッケイホウ ニ カンスル ケンキュウ : ケタ ホウコウ ブレース コウゾウ ノ タイシン セイノウ ヒョウカ
  • － 桁方向ブレース構造の耐震性能評価 －
  • －Seismic performance of braces in the longitudinal direction considering damage－

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Abstract

 The reuse system is one of methods to reduce environmental burden in the structural field. In the pre-demolition survey, information such as building design documents and steel material standard certificates are collected to confirm. After demolition of target buildings, based on the results obtained by destructive-test or non-destructive test, the degree of damage for reuse is evaluated. Design method of building steel structures for reuse consists of three types which are elastic design method, elasto-plastic design method, and design method considering damages of structural members, and they are used in accordance with structural performances.<br> In this paper, the authors propose design method of building steel structures considering damage of structural members for reuse introducing reduction ratio. Seismic performance of braces in the longitudinal direction introducing reduction ratio of structural members is estimated. Between a dynamic ductility index of structure and reduction ratio of structural members are discussed by seismic response analysis. Seismic performances such as the ultimate displacement, the yield base shear force coefficient and initial natural period are investigated.<br> The following findings are obtained from the results of our analyses.<br> 1) The concept of seismic performance evaluation introducing the reduction ratio of structural members by strength and rigidity for reuse is shown.<br> 2) Dynamic Ductility Index of each model with reduction ratio is proportional to the strength reduction ratio βs. Dynamic Ductility Index is approximately evaluated by index when the critical displacement decreases by the rigidity reduction ratio βD.<br> 3) Dynamic Ductility Index of each model with reduction ratio increases in accordance with increasing average ductile coefficient. On the other hand, Dynamic Ductility Index of each model does not change in accordance with increasing a yield base shear coefficient. Dynamic Ductility Index is mainly affected by initial natural periods.<br> 4) Required the yield base shear coefficient can be shown by Contour of Dynamic Seismic Performance Index using the reduction ratio of structural members.

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