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Structural Engineering and Mechanics Volume 83, Number 6, September25 2022 , pages 799-810 DOI: https://doi.org/10.12989/sem.2022.83.6.799 |
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Out-of-plane behavior of perforated masonry walls strengthened with steel-bar truss system |
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Seung-Hyeon Hwang, Ju-Hyun Mun, Keun-Hyeok Yang and Sanghee Kim
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| Abstract | ||
| This study investigated the effect of the strengthening efficiency of unbonded steel-bar truss system on the out-ofplane behavior of perforated masonry walls. Four full-scale unreinforced masonry (URM) walls with two different planes were prepared using the unbonded steel-bar truss system and a URM walls without strengthening. All masonry walls were tested under constant axial and cyclic lateral loads. The obtained test results indicated that the pinching effect in the out-plane behavior of masonry walls tends to decrease in the in- and out-of-plane strengthened URM walls using the unbonded steel-bar truss system with the higher prestressing force ratio (Rp) of vertical reinforcing bars in the unbonded steel-bar truss system, regardless of the perforated type of the masonry wall. Consequently, the highest maximum shear resistance and cumulative dissipated energy at peak load in the post-peak behavior were observed in the in- and out-plane strengthened URM walls with the highest Rp values, which are 2.7 and 6.0 times higher than those of URM. In particular, the strengthening efficiency of the unbonded steel-bar truss system was primarily attributed to the vertical prestressed steel-bars rather than the diagonal steel-bars, which indicates that the strains in the vertical prestressed steel-bars at the peak load were approximately 1.6 times higher than those in the diagonal steel-bars. | ||
| Key Words | ||
| out-of-plane behavior, perforated masonry wall, shear capacity, strengthening, unbonded steel-bar truss unit | ||
| Address | ||
| Seung-Hyeon Hwang: Department of Architectural Engineering, Graduate School, Kyonggi University, 154-42 Gwanggyosan-ro, Youngtong-gu, Suwon, Kyonggi-do, Korea Ju-Hyun Mun, Keun-Hyeok Yang, Sanghee Kim: Department of Architectural Engineering, Kyonggi University, 154-42 Gwanggyosan-ro, Youngtong-gu, Suwon, Kyonggi-do, Korea | ||