The Pushout Test of Seismic Reinforcement System (SRM) Connection that Respond to Earthquake Extensive Level
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RESEARCH PAPER
The Pushout Test of Seismic Reinforcement System (SRM) Connection that Respond to Earthquake Extensive Level Jung-hyun Hwang1 • Jong-ho Ock2 • Youngju Kim3 • Ji-wook Mauk4 • Jaehoon Bae5 Received: 26 December 2019 / Revised: 7 June 2020 / Accepted: 6 July 2020 Ó Iran University of Science and Technology 2020
Abstract This paper introduces a state-of-the art seismic retrofit method (SRM) that has the resistance mechanism of eccentrically braced frames (EBF). In EBF, local failure is induced to the link beam such that other members remain in the elastic state when an earthquake load is applied. SRM works by attaching to an existing building in the form of an external frame to enhance its seismic performance. The seismic reinforcement of medium- and low-rise reinforced concrete buildings has a small inter-story drift; hence, the adhesion between the two materials has a great influence on the seismic reinforcement effect. In this study, a push-out test was performed to show the adhesion performance under various conditions. The performance of various attachment methods was also explored to improve adhesion with the RC structure for securing the performance of the SRM system. Additionally, this study proposes a shear strength equation that considers the influence of the contact direction of steel, increase in plate thickness, and anchor yield strength. The test results indicated that it can be used as a new shear strength equation as the error rate is within 10% compared to the experimental results. Although the web direct bonding method using end plates is disadvantageous in terms of processability, it showed the highest strength improvement results. Furthermore, the chemical anchor (Hilti) connection exhibited stable performance results regardless of the bonding method. Keywords Seismic retrofit Push-out Shear strength Bond performance
1 Introduction Recently, various attempts have been made to increase the earthquake resilience in existing buildings. Structural seismic performance must be improved and economical,
& Jaehoon Bae [email protected] Jung-hyun Hwang [email protected]
and constructability aspects must be considered to increase seismic resistance against earthquakes. Many studies are being conducted on seismic retrofit systems in consideration of economic and constructability issues around the world.
2
School of Architecture, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, Republic of Korea
3
Korea Institute of Structural Engineering and Consulting, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Republic of Korea
4
Korea Disaster Prevention Technology Co., LTD., 129, Bongeunsa-ro, Gangnam-gu, Seoul, Republic of Korea
5
School of Civil, Environmental, and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
Jong-ho Ock [email protected] Youngju Kim [email protected] Ji-wook Mauk [email protected] 1
Program of Architectu
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