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Earthquakes and Structures Volume 19, Number 6, December 2020 , pages 459-469 DOI: https://doi.org/10.12989/eas.2020.19.6.459 |
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In-plane seismic performance of masonry wall retrofitted with prestressed steel-bar truss |
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Seung-Hyeon Hwang, Sanghee Kim and Keun-Hyeok Yang
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| Abstract | ||
| An external prestressed steel-bar truss unit was developed as a new strengthening technology to enhance the seismic performance of an in-plane masonry wall structure while taking advantage of the benefits of a prestressed system. The presented method consists of six steel bars: two prestressed vertical bars to introduce a prestressing force on the masonry wall, two diagonal bars to resist shear deformation, and two horizontal bars to maintain the configuration. To evaluate the effects of this new technique, four full-scale specimens, including a control specimen, were tested under combined loadings that included constant-gravity axial loads and cyclic lateral loads. The experimental results were analyzed in terms of the shear strength, initial stiffness, dissipated energy, and strain history. The efficiency of the external prestressed steel-bar truss unit was validated. In particular, a retrofitted specimen with an axial load level of 0.024 exhibited a more stable post behavior and higher energy dissipation than a control specimen with an observed complete sliding failure. The four vertical bars of the adjacent retrofitting units created a virtual column, and their strain values did not change until they reached the peak shear strength. The shear capacity of the masonry wall structure with external prestressed steel-bar truss units could be predicted using the model suggested by Yang et al. | ||
| Key Words | ||
| masonry wall structures; in-plane seismic performance; prestressed steel-bar truss unit; retrofitted method | ||
| Address | ||
| Seung-Hyeon Hwang, Sanghee Kim and Keun-Hyeok Yang:Department of Architectural Engineering, Kyonggi University, 154-42 Gwanggyosan-ro, Youngtong-gu, Suwon, Kyonggi-Do, 16227, Republic of Korea | ||