EXPERIMENTAL EVALUATION OF REINFORCED CONCRETE COLUMNS WITH PLAIN BARS HAVING DIFFERENT LAP SPLICES RETROFITTED VIA NEAR SURFACE MOUNTED TECHNIQUE

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SEIFI A.; HOSSEINI A.; MAREFAT M.S.; KHANMOHAMMADI M.

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Journal Paper

Paper Information

Journal: Sharif Journal of Civil Engineering Year:2020 | Volume:35-2 | Issue:4/2 Page(s): 87-96

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Information Journal Paper

Title

EXPERIMENTAL EVALUATION OF REINFORCED CONCRETE COLUMNS WITH PLAIN BARS HAVING DIFFERENT LAP SPLICES RETROFITTED VIA NEAR SURFACE MOUNTED TECHNIQUE

Author(s)

SEIFI A. | HOSSEINI A. | MAREFAT M.S. | KHANMOHAMMADI M. | Issue Writer Certificate

Keywords

Reinforced concrete column

plain bar

lap splice

near surface mounted (NSM)

seismic retrofitting

Abstract

Reinforced concrete buildings constructed before 1970s lack seismic detailing and their longitudinal bars have been implemented in three following manners: without lap splices, with straight lap splices and with hooked lap splices. In this study, the seismic retro tting of old-type RC columns with plain bars via near surface mounted (NSM) technique as a modern and practical method was experimentally evaluated, and also the effect of di erent lap splices of longitudinal bars on the behavior of columns was investigated. Six half-scale columns were tested under combined constant axial and quasi-static cyclic lateral loads, including three control specimens with di erent lap splices and lacking seismic detailing, and three specimens strengthened via NSM technique with steel bars. The results indicated that the retro tting method has signi cantly increased the exural strength and improved the seismic parameters, e. g. energy dissipation, hysteresis damping, and damage index. Due to the formation of struts in the core of the control specimen with hooked lap splices, severe damage was in icted at the spliced region which decreases the axial loading capacity of these columns after an earthquake. Therefore, their seismic retro t is a top priority. The proper wrapping of the spliced region of these columns prevents the damage, and the formation of the struts between the hooks increases the lateral strength and improves their seismic performance.

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APA: Copy

SEIFI, A., HOSSEINI, A., MAREFAT, M.S., & KHANMOHAMMADI, M.. (2020). EXPERIMENTAL EVALUATION OF REINFORCED CONCRETE COLUMNS WITH PLAIN BARS HAVING DIFFERENT LAP SPLICES RETROFITTED VIA NEAR SURFACE MOUNTED TECHNIQUE. SHARIF: CIVIL ENINEERING, 35-2(4/2 ), 87-96. SID. https://sid.ir/paper/979204/en

Vancouver: Copy

SEIFI A., HOSSEINI A., MAREFAT M.S., KHANMOHAMMADI M.. EXPERIMENTAL EVALUATION OF REINFORCED CONCRETE COLUMNS WITH PLAIN BARS HAVING DIFFERENT LAP SPLICES RETROFITTED VIA NEAR SURFACE MOUNTED TECHNIQUE. SHARIF: CIVIL ENINEERING[Internet]. 2020;35-2(4/2 ):87-96. Available from: https://sid.ir/paper/979204/en

IEEE: Copy

A. SEIFI, A. HOSSEINI, M.S. MAREFAT, and M. KHANMOHAMMADI, “EXPERIMENTAL EVALUATION OF REINFORCED CONCRETE COLUMNS WITH PLAIN BARS HAVING DIFFERENT LAP SPLICES RETROFITTED VIA NEAR SURFACE MOUNTED TECHNIQUE,” SHARIF: CIVIL ENINEERING, vol. 35-2, no. 4/2 , pp. 87–96, 2020, [Online]. Available: https://sid.ir/paper/979204/en

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