مطالعه‌ی آزمایشگاهی ستون لاغر بتن آرمه با مقاطع دایروی و مربعی تقویت شده باکامپوزیت CFRP با روش شیارزنی تحت بار دارای خروج از مرکزیت
The application of FRP composites is one of the most prevalent methods for retrofitting concrete structures. Strengthening of columns as a major member of structures undergoin...
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| Format: | Article |
| Language: | fas |
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Sharif University of Technology
2020-11-01
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| Series: | مهندسی عمران شریف |
| Subjects: | |
| Online Access: | https://sjce.journals.sharif.edu/article_21571_19334c3679f761a6619ef8634db7a379.pdf |
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| author | M. Noroozolyaee M. Taherirani D. Mostofinejad |
| author_facet | M. Noroozolyaee M. Taherirani D. Mostofinejad |
| author_sort | M. Noroozolyaee |
| collection | DOAJ |
| description | The application of FRP composites is one of the most prevalent methods for
retrofitting concrete structures. Strengthening of columns as a major member of
structures undergoing concentric or eccentric loads is of considerable
importance. The column under eccentric loading experiences lateral deflection
at any particular column height, which is defined as an eccentricity for the
axial load at both ends of the column. The lateral deflection would lead to the
secondary moment, whose combination with the primary moment will produce more significant effects. Although concrete columns are mostly under eccentric
loading in practical use and are vulnerable to instability caused by the
slenderness effect, limited experimental studies have been conducted on the
behavior of slender concrete columns strengthened with FRP composites in
comparison with strengthened short columns. Previous studies state that the
strength of columns increases with retrofitting with FRP; however, the strengthening effect of FRP on the column under axial-bending (P-M) loading
would be reduced with an increase in slenderness. In other words, the capacity
of FRP is not achieved completely since the column is vulnerable to instability
and buckling. As a result of that, the slenderness effect may prevent the
column to achieve its maximum load-carrying capacity. In this study, six
concrete specimens in the height of 900 mm under eccentric loading with 60 mm
eccentricity were tested. Half of the specimens were with a circular cross-section and half with a square cross-section. All the specimens are retrofitted with FRP composites in the longitudinal direction using externally bonded reinforcement (EBR) and externally bonded reinforcement on grooves (EBROG) method. Results show that for the columns strengthened via the EBROG method, the load-carrying capacity is more than that of reference and EBR columns. Furthermore, the EBROG method decreases secondary effects and increases ductility in slender columns compared with reference and EBR columns. |
| first_indexed | 2024-03-12T13:48:37Z |
| format | Article |
| id | doaj.art-fbdd1744e7b84108a67a86bbc660cde7 |
| institution | Directory Open Access Journal |
| issn | 2676-4768 2676-4776 |
| language | fas |
| last_indexed | 2024-03-12T13:48:37Z |
| publishDate | 2020-11-01 |
| publisher | Sharif University of Technology |
| record_format | Article |
| series | مهندسی عمران شریف |
| spelling | doaj.art-fbdd1744e7b84108a67a86bbc660cde72023-08-23T07:52:15ZfasSharif University of Technologyمهندسی عمران شریف2676-47682676-47762020-11-0136.23.131110.24200/j30.2019.51384.239821571مطالعه‌ی آزمایشگاهی ستون لاغر بتن آرمه با مقاطع دایروی و مربعی تقویت شده باکامپوزیت CFRP با روش شیارزنی تحت بار دارای خروج از مرکزیتM. Noroozolyaee0M. Taherirani1D. Mostofinejad2Dept. of Civil Engineering Isfahan University of TechnologyDept. of Civil Engineering Isfahan University of TechnologyDept. of Civil Engineering Isfahan University of TechnologyThe application of FRP composites is one of the most prevalent methods for retrofitting concrete structures. Strengthening of columns as a major member of structures undergoing concentric or eccentric loads is of considerable importance. The column under eccentric loading experiences lateral deflection at any particular column height, which is defined as an eccentricity for the axial load at both ends of the column. The lateral deflection would lead to the secondary moment, whose combination with the primary moment will produce more significant effects. Although concrete columns are mostly under eccentric loading in practical use and are vulnerable to instability caused by the slenderness effect, limited experimental studies have been conducted on the behavior of slender concrete columns strengthened with FRP composites in comparison with strengthened short columns. Previous studies state that the strength of columns increases with retrofitting with FRP; however, the strengthening effect of FRP on the column under axial-bending (P-M) loading would be reduced with an increase in slenderness. In other words, the capacity of FRP is not achieved completely since the column is vulnerable to instability and buckling. As a result of that, the slenderness effect may prevent the column to achieve its maximum load-carrying capacity. In this study, six concrete specimens in the height of 900 mm under eccentric loading with 60 mm eccentricity were tested. Half of the specimens were with a circular cross-section and half with a square cross-section. All the specimens are retrofitted with FRP composites in the longitudinal direction using externally bonded reinforcement (EBR) and externally bonded reinforcement on grooves (EBROG) method. Results show that for the columns strengthened via the EBROG method, the load-carrying capacity is more than that of reference and EBR columns. Furthermore, the EBROG method decreases secondary effects and increases ductility in slender columns compared with reference and EBR columns.https://sjce.journals.sharif.edu/article_21571_19334c3679f761a6619ef8634db7a379.pdfcircular rc columnsquare rc columnslendernessretrofittingfrp compositessecondary effectsgrooving method (gm) |
| spellingShingle | M. Noroozolyaee M. Taherirani D. Mostofinejad مطالعه‌ی آزمایشگاهی ستون لاغر بتن آرمه با مقاطع دایروی و مربعی تقویت شده باکامپوزیت CFRP با روش شیارزنی تحت بار دارای خروج از مرکزیت مهندسی عمران شریف circular rc column square rc column slenderness retrofitting frp composites secondary effects grooving method (gm) |
| title | مطالعه‌ی آزمایشگاهی ستون لاغر بتن آرمه با مقاطع دایروی و مربعی تقویت شده باکامپوزیت CFRP با روش شیارزنی تحت بار دارای خروج از مرکزیت |
| title_full | مطالعه‌ی آزمایشگاهی ستون لاغر بتن آرمه با مقاطع دایروی و مربعی تقویت شده باکامپوزیت CFRP با روش شیارزنی تحت بار دارای خروج از مرکزیت |
| title_fullStr | مطالعه‌ی آزمایشگاهی ستون لاغر بتن آرمه با مقاطع دایروی و مربعی تقویت شده باکامپوزیت CFRP با روش شیارزنی تحت بار دارای خروج از مرکزیت |
| title_full_unstemmed | مطالعه‌ی آزمایشگاهی ستون لاغر بتن آرمه با مقاطع دایروی و مربعی تقویت شده باکامپوزیت CFRP با روش شیارزنی تحت بار دارای خروج از مرکزیت |
| title_short | مطالعه‌ی آزمایشگاهی ستون لاغر بتن آرمه با مقاطع دایروی و مربعی تقویت شده باکامپوزیت CFRP با روش شیارزنی تحت بار دارای خروج از مرکزیت |
| title_sort | مطالعه‌ی آزمایشگاهی ستون لاغر بتن آرمه با مقاطع دایروی و مربعی تقویت شده باکامپوزیت cfrp با روش شیارزنی تحت بار دارای خروج از مرکزیت |
| topic | circular rc column square rc column slenderness retrofitting frp composites secondary effects grooving method (gm) |
| url | https://sjce.journals.sharif.edu/article_21571_19334c3679f761a6619ef8634db7a379.pdf |
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