Estimation of The Mechanical Properties of Mud Shear Walls Subjecting to Lateral Shear Force

[The 11th International Conference on Non-conventional Materials and Technologies (NOCMAT 2009)] 6-9 September 2009, Bath, UKIn this study, load-deformation relationship of mud shear wall (MSW) was assumed as a combined one which composed of non-linear semi-rigid frame action and non-linear solid wall action. In order to establish mechanical models, at first moment-rotation relationship of “Nuki” joint and mortise-tenon joint were theoretically derived. Then stress-strain relationship of solid mud part with bamboo laths was estimated by truncating load-deformation curve of frame only from that of full MSW. Finally, every data were inputted into non-linear FEM program to analyze three different MSW specimens. In the case of normal MSW, effect of frame was small, while in the case of hanging wall type MSW, the effect of frame joints was remarkable, especially in post yielding range

Evaluation on dynamic performance of glulam frame structure composed of slotted bolted connection system

World Conference on Timber Engineering (WCTE 2014), Quebec City, Canada, 10-14 August 2014.Earthquake-resisting performance of glulam frame structure was evaluated by shaking table tests on a specially designed glulam “double cross shape” specimen composed of slotted bolted connection (SBC) system. By the first vibration test using sinusoidal wave having a maximum acceleration of 800gal, the specimen survived until 80% level of input waves without damage. After renewing SBC system, the second vibration test was done on a same specimen using the JMA-Kobe NS waves having a PGA of 818gal. The specimen survived until 80% level of input without damage but slightly failed by the panel-shear when 100% level was inputted. Earthquake-resisting performance of glulam moment-resisting joints composed of SBC system was considered as satisfactory enough for ductile joint system, but improvement of panel-shear of glulam member itself was recognized as a future research need

<Preliminary>Effect of the Degree of Wedge Fixation on the Rotational Behavior of Beam-Column "Nuki" Timber Joint

この論文は国立情報学研究所の学術雑誌公開支援事業により電子化されました

Traditional Javanese Wooden Houses (Joglo) Damaged By May 2006 Yogyakarta Earthquake, Indonesia

A post-earthquake survey was performed on Joglo Javanese wooden houses, seriously affected by the May 27, 2006, Yogyakarta earthquake in Java, Indonesia. Investigations on 20 damaged Joglo buildings reveal that the structure's damage can be classified into three categories: slip between columns and stone foundation, broken joints between outer ring beam and column, and collapse of core structure. Four damage levels were defined: I) damage on the base joint of side structure, II) fatal damage on the side-structure, III) destroyed core structure, and IV) totally collapsed core structure. The side structure turns out to be relatively weak, while the core structure is able to secure the structural performance of Joglo buildings. A distinct relationship was identified between the levels of structural damage and the area ratio of core structure and the main column projection. It was verified that structural proportion significantly contributes to the assessment of damage. The joint failure represents a significant point in terms of maximum retention for conservation. Based on a damage level approach, an assessment methodology to optimize reinforcing strategies. This study gives recommendations for the preservation of such precious structures from future earthquakes, while avoiding inappropriate interventions