Explanipedia

Analytical investigation on the rotational behavior of dovetail mortise–tenon joints between beams and columns in traditional Chinese timber frames Open

Zherui Li, Akihisa Kitamori, Xicheng Zhang, Yajie Wu, Lipeng Zhang , et al. · 2024

We theoretically analyzed the rotational behavior of beam–column dovetail joints in traditional Chinese timber frames in this study. An analytical model of dovetail joints at both the column head and body was designed by clarifying the mom…

EXPERIMENTAL STUDY ON THE RESTORING FORCE CHARACTERISTICS OF TRADITIONAL TIMBER FRAME CONSISTING OF <i>“DAITOHIJIKI”</i> (LARGE BEARING BROCK WITH BRACKET ARMS), <i>“KASIRANUKI”</i> (HEAD TIE-BEAMS), AND THREE CIRCULAR COLUMNS AND ON THE MOMENT-RESISTING PERFORMANCE EVALUATED IN EACH STRUCTURAL ELEMENT Open

Kohei KOMATSU, Akihisa Kitamori, Takafumi Nakagawa, Shoichi NAKASHIMA, Hiroshi Isoda · 2023

To clarify the influence of the head tie-beams on the restoring force of the traditional wooden frame structure, static loading tests were conducted on the model specimens with four different kinds of head tie-beam specifications subjected…

Experimental Behavior of L-Shaped and T-Shaped Cross-Laminated Timber to Evaluate Shear Walls with Openings Open

Hiroshi Isoda, Tokikatsu Namba, Akihisa Kitamori, Takuro Mori, Tatsuya Miyake , et al. · 2023

There is increasing interest in using cross-laminated timber (CLT) in buildings because of its high strength and stiffness. In Japan, structural design guidelines for CLT buildings were established in 2016 and construction of mid-rise buil…

EXPERIMENTAL STUDY ON LATERAL PERFORMANCE OF A FRAME WITH DEEP BEAMS AND HANGING MUD WALLS IN TRADITIONAL JAPANESE RESIDENTIAL HOUSES Open

Zherui Li, Hiroshi Isoda, Akihisa Kitamori, Takafumi Nakagawa, Yasuhiro Araki · 2023

This study aimed to investigate the resistance of a frame with deep beams and hanging mud walls, clarify the working mechanisms and contributions of different load-bearing elements in the frame.A series of comparative experiments of the fr…

Experimental study on flexural properties of timber columns with interior notches in traditional Japanese timber structures Open

Zherui Li, Hiroshi Isoda, Akihisa Kitamori, Takafumi Nakagawa, Yasuhiro Araki , et al. · 2021

STRUCTURAL PERFORMANCE OF COMPOSITE STRUCTURE WITH CLT WALL INFILLED IN STEEL FRAMES USING DRIFT-PIN WITH STEEL PLATE Open

Kazumi KANAZAWA, Hiroshi Isoda, Akihisa Kitamori, Tetsu USAMI, Yasuhiro Araki · 2021

In Japan, Cross Laminated Timber (CLT) is attracting attention as the way of using forest resources that have reached cutting time. CLT is expected to be used for middle-to-high-rise building with making use of stable in-plane shear perfor…

Mechanical Properties of Compressed Wood with Various Compression Ratios Open

Buan Anshari, Akihisa Kitamori, Kiho Jung, Kohei Komatsu, Zhongwei Guan · 2021

This paper investigates five groups of compressed wood (CF), four of them made from compressed Japanese cedar with four different compression ratios (CR) of 33%, 50%, 67% and 70% and one without compression (control). The specimens were co…

EXPERIMENTAL STUDY ON CLT SEISMIC PANEL INFILLED WITHIN STEEL FRAME Open

Kouji FUKUMOTO, Marina KOUDA, Kazuhito KUBO, Tetsu USAMI, Akihisa Kitamori , et al. · 2021

We have developed the new hybrid structure of CLT infill and steel frame for middle-rise and high-rise buildings. This structural system can achieve the high structural potential of the CLT panel by holding around the CLT panel with steel …

Nonlinear finite-element analysis of embedment behavior of metal washer in bolted timber joints Open

Masaki Teranishi, Doppo Matsubara, Yoshiaki Wakashima, Hidemaru Shimizu, Akihisa Kitamori · 2021

The pretensioning force in bolted joints enhances the lateral strength of the connections, and causes the embedment of metal washers into wood. Despite the significance of embedment behavior in the design of bolted joints, its mechanism ha…

CONTRIBUTIONS OF PLYWOOD SHEAR WALLS AND PLASTERBOADS ON SEISMIC RESPONSE REDUCTION OF TIMBER STRUCTURES USING WOOD FRICTION-BASED DAMPERS Open

K. Ishikawa, Yoshiaki Wakashima, Ryotaro FUJIOKA, Hidemaru Shimizu, Doppo Matsubara , et al. · 2021

The study deals with the damage control system of wooden houses using wood friction-based dampers subjected to earthquake motion. In this study, wood friction joints were developed to introduce damping into wood shear walls. Shaking table …

SEISMIC RETROFIT OF TRADITIONAL WOODEN STRUCTURES BY DEVELOPMENT OF A SEISMIC GRID WALL WITH HIGH INITIAL STIFFNESS Open

Hidemaru Shimizu, Yoshiaki Wakashima, Hitomi SHIMIZU, Akihisa Kitamori · 2020

Wood grid walls are widely used as a seismic-load resisting element for upgrading traditional Japanese wood structures. However, because the elements are expected to be joined loosely due to unavoidable drying shrinkage, the current design…

The load factor in bolted timber joints under external tensile loads Open

Doppo Matsubara, Yoshiaki Wakashima, Hidemaru Shimizu, Akihisa Kitamori · 2020

Joint Technology in Timber Structure Open

Akihisa Kitamori · 2019

Utilization of wood as building materials is increasingly expected. As a further development of woodenbuildings, there is an increasing movement to make mid-rise and larger scale buildings, such as apartmenthouses and commercial buildings.…

Stress relaxation behavior of wood in the plastic region under indoor conditions Open

Yoshiaki Wakashima, Hidemaru Shimizu, Akihisa Kitamori, Doppo Matsubara, K. Ishikawa , et al. · 2019

The stress relaxation behavior of wood in the plastic region was measured by clamping wood specimens with bolts for up to 5 years under indoor environmental conditions. An initial stress was applied by displacement control, whereby a steel…

A novel method for estimating ultimate clamp force in lag screw timber joints with steel side plates Open

Doppo Matsubara, Yoshiaki Wakashima, Yasushi Fujisawa, Hidemaru Shimizu, Akihisa Kitamori , et al. · 2019

This paper proposes a numerical method for estimating the ultimate clamp force of lag screw timber joints with steel side plates based on the pull-out strength and thread friction coefficient of the lag screw. Lag screw tightening tests an…

Estimation of Yield Load for Unit CLT Connection with Bolt and Steel Plate based on European Yield Theory Open

Shoichi Nakashima, Yasuhiro Araki, Akihisa Kitamori, Takafumi Nakagawa, Hiroshi Isoda , et al. · 2019

CLTを用いた建築構造物のパネル端部を対象とした，CLTと鋼板のボルト接合部の降伏荷重の推定と実験による検証を実施した．接合形式（鋼板添板一面せん断接合，鋼板添板二面せん断接合，鋼板挿入二面せん断接合）と層構成（3層3プライ，5層5プライ），ボルト径（12mm，16mm，20mm）をパラメータとして，それぞれの条件における単位接合部の降伏荷重をヨーロッパ型降伏理論に基づき推定し，CLTと鋼板を使用したボルトのせん断実験により検証した．実験値と計算値は良い一致を示し，式の有用…

LONG-TERM STIFFNESS DECLINATION CONTROL OF TIMBER LATTICE SHEAR WALL BY COMPRESSED WOODEN WEDGE Open

Akihisa Kitamori, Kiho Jung, Kohei Komatsu, Yasuo Kataoka · 2018

This paper reports a development of long-term stiffness reduction control method of timber lattice shear wall due to shrinkage by introducing compressed wooden wedge into the joint. The effectiveness of the developed method based on size r…

BENDING PERFORMANCE OF TRADITIONAL SHEAR KEYED COLUMN TO BEAM JOINTS Open

Akihisa Kitamori, Masahiro INAYAMA, Masami Gotou, Hiroshi Isoda · 2018

The moment carrying capacity of beam-to-column joint (Sashigamoi) on a large size column has sufficient strength property in structural designing the traditional timber buildings. The load carrying capacity of traditional timber joints suc…

Effects of tightening speed on torque coefficient in lag screw timber joints with steel side plates Open

Doppo Matsubara, Yoshiaki Wakashima, Yasushi Fujisawa, Hidemaru Shimizu, Akihisa Kitamori , et al. · 2017

Experimental Study on Structural Behaviour of Glulam Beams Pre-stressed by Compressed Wood Open

Buan Anshari, Akihisa Kitamori, Kiho Jung, Kohei Komatsu · 2017

This paper presents the study on structural behaviour of glulam beams pre-stressed by compressed wood (CW) in terms of load carrying capacity, strength and stiffness. Glulam beams were strengthened by inserting CW blocks into the pre-cut r…

In Search of Substitution Material for Traditional Javanese Wooden Houses Open

Yulianto P. Prihatmaji, Akihisa Kitamori, Kohei Komatsu · 2017

Many Javanese traditional timber structures have been destroyed by major earthquake. The impact of the disaster demanded a deeper finding on timber materials for repairing and reconstructing. To understand the mechanical property of timber…

Development of Earthquake-proof Fittings of Traditional Wooden Frame Structures Open

Takehiro WAKITA, Fuyuki Konuta, Akihisa Kitamori, Yasuo Kataoka · 2017

There are many old traditional wooden frame buildings which were specified as cultural heritage or will be specified as Japanese important building in the near future. But there are many buildings which do not have good performance against…

Study on Mechanical Properties of Tropical Timber Hardwood Species: Promoting Javanese Inferior Timbers for Traditional Wooden Houses Open

Yulianto P. Prihatmaji, Akihisa Kitamori, Satoru Murakami, Kohei Komatsu · 2017

Recent earthquake hitting Java Island in Indonesia has caused many damaged to Javanese wooden houses, including Joglo-type building. The Traditional wooden houses use Teak wood or locally known as Jati (Tectona grandis) and Nangka wood (Ar…

Static and Dynamic Properties of Portal Frames Composed of Built-Up Sawn Square Timber Open

Kohei Komatsu, Akihisa Kitamori · 2017

In order to propose an alternative structural element to be used for wooden dwelling houses in rich forest area, we paid attentions to a portal frame structure which is composed of not glulam but built-up members whose raw materials are dr…

Relationship between clamp force and pull-out strength in lag screw timber joints Open

Doppo Matsubara, Yoshiaki Wakashima, Yasushi Fujisawa, Hidemaru Shimizu, Akihisa Kitamori , et al. · 2017

Load Carrying Capacity of Drift Pin Joint of Cross Laminated Timber (CLT) with Steel Insert Plate Open

Shoichi Nakashima, Akihisa Kitamori, Kohei Komatsu · 2017

Cross Laminated Timber (CLT) is a structural plate element which is approved in Europe and is intended to be approved in Japan. It consists of small dimension laminae, in which laminae parallel and perpendicular to longitudinal direction a…

Tightening Torque Calculation Method for Plastic Clamp Force of Bolted Timber Joints Open

Doppo Matsubara, Yoshiaki Wakashima, Yasushi Fujisawa, Hidemaru Shimizu, Akihisa Kitamori , et al. · 2017

木材のボルト接合において,締付けトルクと締付け軸力の関係をバイリニアモデルとし,塑性域締付け軸力を管理するための締付けトルク算定法を提案した。そしてワッシャーの辺長比を7.8から18.8の範囲でパラメータとした12種類のワッシャーを対象としたスギ―ボルト接合の締付け実験を行い,提案算定法による計算値を検証した。結果,辺長比7.8から16.0の範囲では,弾性範囲のトルク係数に影響を及ぼさないことがわかった。また算定法にて,塑性域の最大トルク係数と弾性域の最大トルク係数の比をγ…

LATERAL STRUCTURAL PERFORMANCE OF NARROW SIZE CROSS LAMINATED TIMBER CONNECTED WITH TENSILE BOLTS Open

Sota Miura, Hirosi ISODA, Takahiro Tsuchimoto, Takahumi NAKAGAWA, Akihisa Kitamori , et al. · 2016

Shear wall tests of single CLT wall of which size is 1x3m were conducted to evaluate the shear performance and 4m width shear wall with opening tests consisting of double 1x3m of CLT panels and hanging panels were also conducted. Tensile b…

DEVELOPMENT OF CLT PANELS BOND-IN METHOD FOR SEISMIC RETROFITTING OF RC FRAME STRUCTURE Open

Ryota Haba, Akihisa Kitamori, Takuro Mori, Takeshi Fukuhara, Takaaki KURIHARA , et al. · 2016

Many RC buildings built before 1981 need seismic retrofit at present in Japan. Installing new RC shear walls or steel braces in RC frame is one of the seismic retrofit techniques. In this paper, the new type of seismic retrofit method usin…

Bending Strength of Damaged Timber Beam Repaired by Adhesive-vacuumed Method Open

Yulianto P. Prihatmaji, Akihisa Kitamori, Kohei Komatsu · 2015

Six scaled-specimens of glued-acacia beam were tested in bending and effectiveness of non-metal repair of damaged beam by epoxy adhesive-vacuumed method was investigated. Two failure modes of glued-acacia beams by bending test were crack i…

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