複数建物の微動計測データ群を用いた汎用的逆解析アプローチによる非構造部材の影響を考慮可能な新築建物の層剛性推定法

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タイトル別名
  • STORY STIFFNESS ESTIMATION METHOD FOR NEW CONSTRUCTED BUILDINGS WITH NON-STRUCTURAL ELEMENTS BASED ON INVERSE ANALYSIS USING MICROTREMOR RECORDS
  • フクスウ タテモノ ノ ビドウ ケイソク データグン オ モチイタ ハンヨウテキ ギャクカイセキ アプローチ ニ ヨル ヒコウゾウ ブザイ ノ エイキョウ オ コウリョ カノウ ナ シンチク タテモノ ノ ソウ ゴウセイ スイテイホウ

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<p> Recently in Japan, a direction of housing policy is changing from newly construction oriented to stock oriented. In order to form a secondary market by supplying safe, secure and high-quality existing houses, it is desirable to establish a technology of "visualization" that appropriately evaluates the quality and performance of the housing and presents it in an easy way for consumers to understand.</p><p> In this paper, a generalized method is proposed to construct an estimation model for story stiffness of new constructed houses based on design information and microtremor records of multiple houses. As the design information, story weights, wall type, wall length, opening type, etc. are extracted as known information. By referring these known information, story stiffness estimation model is constructed to estimate stiffness of each story and unknown model parameters can be determined so that estimated error to the actual primary eigenvalue frequencies is minimized.</p><p> In this research, the validity of the proposed method is examined by using design information and tremor measurement data of 36 buildings of two-story industrialized houses as an example (total 72 data in both X and Y direction). Based on the identified unknown parameters, the vibration mechanism of real houses in the micro vibration range also can be examine.</p><p> The results obtained are summarized as follows.</p><p> (1) Inverse analysis method is proposed to determine unknown parameters, i.e., wall reference stiffness, stiffness reduction rate due to the wall opening and wall proportion effect to stiffness, etc., to establish stiffness estimation model of new constructed buildings by using known design information, i.e., each floor mass, wall type, wall length, wall opening type, etc.. This procedure can be performed by minimizing the estimated error between the actual measurement value and the theoretical value.</p><p> (2) In addition to stiffness of frame structure, non-structural elements, i.e., partition walls, outer walls, wall openings, and wall proportion and so on, can be directly considered</p><p> (3) It is confirmed that without giving any specifications, it is possible to obtain realistic parameters which is applicable to physical considerations on the reduction coefficient for the wall opening, the nonlinear effect of the wall proportion, the reference stiffness of the outer and partition wall.</p>

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