EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE EVALUATION OF TRADITIONAL TIMBER FRAME STRUCTURES WITH LARGE HANGING WALLS

* ** *** **** *****

Saki OHMURA, Yasuhiro NAMBU, Yoshihiro SHIBUYA, Mina SUGINO and Yasuhiro HAYASHI

The objective of this study is demonstrative elucidation of mechanical characteristics of timber frame structures with large hangingwalls in order to construct a reasonable and practical seismic evaluation method. First, we conduct static loading tests of timber framestructures with full walls or large hanging walls which have different specifications of walls and the number of spans. Second, weanalyze damage states and mechanical characteristics of the specimens and their elements such as mud wall, columns and Sashigamoi.Finally, we reveal the applicability and problems of the current methods based on the test results.

Keywords: Traditional Timber Building, Static Loading Test, Large Hanging Wall,Seismic Performance Evaluation, Deformation Capacity

, , , ,

Graduate Student, Dept. of Architecture and Architectural Eng., Kyoto Univ.Graduate Student, Dept. of Architecture and Architectural Eng., Kyoto Univ., M. Eng.,JSPS Research Fellow, DC1Kansai Electric Power Co., Inc., M. Eng.Assist. Prof., Dept. of Architecture and Architectural Eng., Kyoto Univ., Dr. Eng.Prof., Dept. of Architecture and Architectural Eng., Kyoto Univ., Dr. Eng.

***

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大垂壁を有する伝統木造軸組架構の耐震性能評価に関する実験的研究EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE EVALUATION

OF TRADITIONAL TIMBER FRAME STRUCTURES WITH LARGE HANGING WALLS

大 村 早 紀＊，南 部 恭 広＊＊，澁 谷 悦 敬＊＊＊，杉 野 未 奈＊＊＊＊，林   康 裕＊＊＊＊＊

Saki OHMURA, Yasuhiro NAMBU, Yoshihiro SHIBUYA, Mina SUGINO and Yasuhiro HAYASHI

    ＊  京都大学大学院工学研究科建築学専攻 修士課程   ＊＊  京都大学大学院工学研究科建築学専攻 博士後期課程・修士（工学）

日本学術振興会特別研究員 DC1  ＊＊＊  関西電力㈱（元 京都大学大学院生）・修士（工学） ＊＊＊＊  京都大学大学院工学研究科建築学専攻 助教・博士（工学）＊＊＊＊＊  京都大学大学院工学研究科建築学専攻 教授・工博

Grad. Stud., Dept. of Architecture and Architectural Eng., Kyoto Univ.Grad. Stud., Dept. of Architecture and Architectural Eng., Kyoto Univ., M.Eng., JSPS Research Fellow, DC1Kansai Electric Power Co., Inc., M.Eng.Assist. Prof., Dept. of Architecture and Architectural Eng., Kyoto Univ., Dr.Eng.Prof., Dept. of Architecture and Architectural Eng., Kyoto Univ., Dr.Eng.

日本建築学会構造系論文集 第81巻 第727号，1479-1489， 2016年9月J. Struct. Constr. Eng., AIJ, Vol. 81 No. 727, 1479-1489, Sep., 2016

DOI http://doi.org/10.3130/aijs.81.1479【カテゴリーⅠ】�

─ 1479 ─

構造系　727号�

2.

2 .1

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120 120mm 120 240mm 120

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3

1

3 3(a),

(b) 18) (=60mm)

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─ 1480 ─

構造系　727号�

(b)

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─ 1481 ─

構造系　727号�

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─ 1482 ─

構造系　727号�

9

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─ 1483 ─

構造系　727号�

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─ 1484 ─

構造系　727号�

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─ 1485 ─

構造系　727号�

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構造系　727号�

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─ 1487 ─

構造系　727号�

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2013.10.

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, , 602 , pp.187-194, 2006.4.

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, pp.2-28, 2005.3.

─ 1488 ─

構造系　727号�

EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE EVALUATION OF TRADITIONAL TIMBER FRAME STRUCTURES WITH LARGE HANGING WALLS

Saki OHMURA* Yasuhiro NAMBU** Yoshihiro SHIBUYA***

Mina SUGINO**** and Yasuhiro HAYASHI*****

*Graduate Student, Dept. of Architecture and Architectural Eng., Kyoto Univ.

**Graduate Student, Dept. of Architecture and Architectural Eng., Kyoto Univ., M. Eng., JSPS Research Fellow, DC1

***Kansai Electric Power Co., Inc., M. Eng.

****Assist. Prof., Dept. of Architecture and Architectural Eng., Kyoto Univ., Dr. Eng.

*****Prof., Dept. of Architecture and Architectural Eng., Kyoto Univ., Dr. Eng.

In Japan, there are a lot of traditional timber buildings which fit the history, the culture and the environment in each area. In our

investigation of traditional timber houses in the important district of groups of historic buildings, mud walls which have various

specifications and crosspieces called Nuki and structures which consist of tall hanging walls and beams called Sashigamoi (called

large hanging walls in this study) were found. Timber frame structures with hanging walls are very important factor to think of seismic

safety of timber buildings because they can lead to collapse of the whole buildings by breakage of columns at joints of the lower end

of hanging walls. Although static loading tests and shaking table tests of timber frames with hanging walls have been conducted, the

failure behavior and deformation performance have not been analyzed in detail.

As the current methods of seismic capacity evaluation, “Implementation Guidance for Basic Seismic Assessment of Important

Cultural Properties (Buildings)” proposed by Agency for Cultural Affairs and “Seismic Evaluation and Retrofit Methods of Wooden

Houses” proposed by the Japan Building Disaster Prevention Association have been used. Although the consistency between the

current methods and the test results has been examined, the hanging walls of the specimens are not tall and the analysis is not enough

about shear force and deformation performance of the columns, flexural strength of the columns and limit deformation evaluation of

the frame structures with hanging walls.

Therefore, the purpose of this study is demonstrative elucidation of dynamic characteristics of timber frame structures with large

hanging walls in order to construct a reasonable and practical seismic evaluation method. First, we conduct static loading tests of

timber frame structures with full walls or large hanging walls. The height of the full wall specimens and the large hanging wall

specimens is 2.70m and 3.87m, respectively. The span length of the specimens is 1.82m. The height of hanging walls is 1.80m. The

specification of walls and the number of spans are experimental variables. Second, we analyze damage states and mechanical

characteristics of the specimens and their elements such as mud wall, columns and Sashigamoi. Finally, we reveal the applicability

and problems of the current methods based on the test results.

The major findings obtained from the research are summarized as follows:

a) Different specifications of Nuki do not make much difference of the hysteresis characteristics of the full wall specimens in

spite of the different failure states of walls.

b) The hysteresis characteristics of the large hanging walls can be calculated using the hysteresis characteristics of the full wall

specimens which have the same specification of wall.

c) Timber frames with hanging walls do not lose the restoring force immediately after breakage of columns because the broken

columns have the restoring force. Within this study, rotational angle of the specimens is more than about 1/15 rad when the

restoring force decreases to 80% of the maximum value.

d) Shear force of a column is not depend on only the sum of half of the distances from the column to the adjacent columns on the

both sides, because shear force is affected by the sectional performance and Young’s modulus of the column, the location of

the column against the loading direction and breakage of the surrounding columns. In addition, we indicated that it is need to

consider rotational deformation of columns at column-Sashigamoi joints in evaluation of deformation of timber frames with

hanging walls. From the above, it is revealed that there is room for improvement on the current methods in seismic

performance evaluation of timber frames with large hanging walls.

EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE EVALUATION OF TRADITIONAL TIMBER FRAME STRUCTURES WITH LARGE HANGING WALLS

Saki OHMURA＊, Yasuhiro NAMBU＊＊, Yoshihiro SHIBUYA＊＊＊, Mina SUGINO＊＊＊＊ and Yasuhiro HAYASHI＊＊＊＊＊

＊ Grad. Stud., Dept. of Architecture and Architectural Eng., Kyoto Univ. ＊＊ Grad. Stud., Dept. of Architecture and Architectural Eng., Kyoto Univ., M.Eng.,

JSPS Research Fellow, DC1 ＊＊＊ Kansai Electric Power Co., Inc., M.Eng.

＊＊＊＊ Assist. Prof., Dept. of Architecture and Architectural Eng., Kyoto Univ., Dr.Eng. ＊＊＊＊＊ Prof., Dept. of Architecture and Architectural Eng., Kyoto Univ., Dr.Eng.

（2015 年 10 月 8 日原稿受理，2016 年 5 月 24 日採用決定）

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構造系　727号�

構造系　727号�