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Seismic Retrofit Technique Using Plywood and Common Nails for Connections of Low-Rise Timber Frame Construction

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Title: Seismic Retrofit Technique Using Plywood and Common Nails for Connections of Low-Rise Timber Frame Construction
Authors: Hirakawa, Hideki Browse this author
Uematsu, Takeyoshi Browse this author
Fukushima, Akira Browse this author
Adachi, Yusuke Browse this author
Kikuta, Koki Browse this author →KAKEN DB
Keywords: seismic retrofit
timber frame
post-and-beam construction
steel timber connector
pullout test
in-plane cyclic test
Issue Date: 16-Jul-2022
Publisher: MDPI
Journal Title: Buildings
Volume: 12
Issue: 7
Start Page: 1029
Publisher DOI: 10.3390/buildings12071029
Abstract: Since the Japanese Building Standards Act was revised in 2000, the installation of steel timber connectors (STCs) to reinforce timber frame (TF) connections has been mandated for new-build TF houses in Japan. However, for the TF houses built before then, more than 40% do not have sufficient STCs and are considered earthquake-prone. This study proposed a simple and easy seismic retrofit technique for such earthquake-prone existing houses. The proposed technique can reinforce TF connections using only plywood and common nails and achieve equivalent performance to the benchmark STCs used in Japanese TF houses, such as the CP-T type or the combination of VP type and BP type STCs. Experiments were performed to compare the proposed technique with the STCs using pullout and full-scale in-plane cyclic tests. The experimental results showed that the proposed technique had a higher seismic performance than the STCs, which was particularly excellent in displacement ductility to prevent a collapse of the TF house without damaging the timbers. The proposed technique will be accepted by many carpenters when retrofitting earthquake-prone existing houses because simple and easy.
Rights: © 2022 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution License (
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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