原文传递
Strengthening Slender Reinforced Concrete Columns Using High-Modulus Bonded Longitudinal Reinforcement for Buckling Control
| 题名： | Strengthening Slender Reinforced Concrete Columns Using High-Modulus Bonded Longitudinal Reinforcement for Buckling Control |
| 其他题名： | American Concrete Institute(ACI).(2008)."Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures."ACI 440.2R,Detroit,MI. |
| 正文语种： | 英文 |
| 作者： | Pedram Sadeghian |
| 关键词： | Slender column;Reinforced concrete;Buckling;Carbon fiber-reinforced polymer (CFRP);High modulus;Strengthening;Concrete and masonry structur |
| 摘要： | This paper introduces a model for strengthening slender reinforced concrete columns. The proposed technique aims at controlling second-order lateral deflections using longitudinal high-modulus bonded reinforcement, thereby altering the loading path to intercept the axial load-bending moment (P-M) interaction curve at a higher axial capacity. With the availability of high and ultra-high-modulus carbon fiber-reinforced polymer (CFRP) plates, this approach should be quite efficient according to Euler's buckling rule, in which column strength is stiffness-controlled. This approach is different from the classical transverse-wrapping method for confinement, a technique that achieves strengthening by enlarging the (P-M) diagram in the compression-controlled region. The proposed model accounts for concrete nonlinearity in compression, cracking in tension, steel rebar plasticity, and certainly geometric nonlinearity, in addition to the possibility of premature CFRP-debonding failure in tension and the lower CFRP strength in compression than tension. The model is validated against experimental results and used in a parametric study to assess the effects of slenderness ratio λ, axial load initial eccentricity ratio e0=h, CFRP reinforcement ratio ρf, and modulus Ef. It was shown that significant gains in axial strength, ranging from 17 to 90％, occur as the magnitudes of λ, ρf, Ef and e0=h increase. |
| 出版年： | 2015 |
| 论文唯一标识： | P-26Y2015V141N04015 |
| 英文栏目名称： | Technical Papers |
| doi： | 10.1061/(ASCE)ST.1943-541X.0001066 |
| 期刊名称： | Journal of Structural Engineering |
| 拼音刊名(出版物代码)： | P-26 |
| 卷： | 141 |
| 期： | 04 |
| 页码： | 138-149 |
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