Use of bolted steel plates for strengthening of reinforced concrete beams and columns

Su, R.K.L.; Cheng, Bei; Wang, L.; Siu, W.H.; Zhu, Yang

doi:10.1080/19373260.2011.567816

Cited by 9 publications

(6 citation statements)

References 21 publications

(27 reference statements)

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“…As a variant of this retrofit method, individual steel plates are added to steel and steel-concrete composite beams and steel joints to enhance their capacity. Within the same context, steel plates and beams with I-shaped or U-shaped sections are used to retrofit also reinforced concrete beams [18,19].…”

Section: Introductionmentioning

confidence: 99%

Optimized seismic retrofit of steel-concrete composite buildings

Papavasileiou

Charmpis

Lagaros

2020

Engineering Structures

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This work is focused on comparatively assessing the cost-effectiveness of three seismic retrofit approaches for non-code-conforming frame buildings with steel-concrete composite columns.The first two of the assessed retrofit approaches aim in indirectly enhancing structural system performance by strengthening individual composite columns using reinforced concrete jackets or concrete-covered steel cages. The third retrofit approach considered aims in upgrading the composite building frame at hand by installing steel bracings at selected bays. A specially developed structural optimization procedure is used to perform an objective comparison of the cost-effectiveness of the three retrofit approaches. The objective of the optimization procedure is to minimize the total retrofit material cost, while constraints are imposed to ensure the satisfaction of design requirements for the retrofitted structure regarding member capacities (according to Eurocodes 3 and 4 for steel beams and composite columns, respectively), structural system performance under horizontal loading (based on interstorey drifts calculated by pushover analyses) and fundamental periods (obtained from eigenvalue analyses). By defining 30 cases of under-designed 2-storey, 4-storey and 6-storey composite buildings (i.e. buildings with steel-concrete composite columns), an extensive numerical investigation involving 120 retrofit optimization runs was conducted. The results obtained provide insight into the relative cost-effectiveness of the three seismic retrofit approaches and reveal certain conditions under which each approach is economically most viable.

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Section: Introductionmentioning

confidence: 99%

Optimized seismic retrofit of steel-concrete composite buildings

Papavasileiou

Charmpis

Lagaros

2020

Engineering Structures

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“…1. Because the bolts at both ends of the steel plates restrain the end rotations of the plates, the initial lateral displacement (v) of the precambered plate can be approximated by a cosine function (Su et al 2011…”

Section: Initial Precambermentioning

confidence: 99%

Theoretical and Experimental Study of Plate-Strengthened Concrete Columns under Eccentric Compression Loading

Wang¹,

Su²

2013

J. Struct. Eng.

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Steel jacketing has been widely used for strengthening reinforced concrete (RC) columns in the past four decades. In practice, the RC columns to be strengthened are usually subjected to eccentric precompressed axial loads. Until now, there have been only limited studies conducted that address the stress-lagging effects between the original column and the new jacket due to the pre-existing load. In this paper, the precambered steel plate strengthening approach, which can alleviate the stress-lagging effects, was adopted to improve the axial strength and moment capacity of the preloaded RC columns subjected to eccentric compression loading. An experimental study that involved eight specimens with different eccentricities, plate thicknesses and initial precamber displacements was conducted to examine the ductility and moment-curvature response of strengthened columns and to validate the effectiveness of this approach. A theoretical model was developed to predict the axial load capacity of the platestrengthened columns. A comparison of the theoretical and experimental results showed that the theoretical model accurately predicted the axial load-carrying capacities of the plate-strengthened columns under eccentric compression loading.

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“…Ersoy, Suleiman, and Tankut (1993), Takeuti, de Hanai, and Mirmiran (2008) and Giménez, Adam, Ivorra, Moragues et al (2009) found that stress-lagging effects could significantly decrease the ultimate axial load capacity of the strengthened columns. To address this stress-lagging problem, Su, Cheng, Wang, Siu, and Zhu (2011) and Su and Wang (2012) proposed a column decompression approach to strengthen preloaded RC columns under axial compression loading. Five fire-exposed RC columns were also axially strengthened by means of this approach (Wang & Su, 2013a, 2014.…”

Section: Introductionmentioning

confidence: 99%

Flexural and axial strengthening of preloaded concrete columns under large eccentric loads by flat and precambered steel plates

Wang

2014

Structure and Infrastructure Engineering

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In this study, the behaviour of the preloaded reinforced concrete columns under large eccentric compression loading and strengthened with flat and precambered steel plates was investigated. An original analytical model considering the effects of stress-lagging induced by eccentric pre-compressed loading was developed to predict the ultimate load capacity of platestrengthened columns. Then, 10 specimens with different eccentricities, plate thicknesses and initial precamber displacements were tested. The strength, deformability, ductility and moment-curvature response of the strengthened columns were examined, and the effectiveness of this approach was validated. The good agreement between the analytical and experimental results demonstrates that the proposed analytical model can accurately predict the load-carrying capacity of the plate-strengthened columns under large eccentric compression loading.

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Use of bolted steel plates for strengthening of reinforced concrete beams and columns

Cited by 9 publications

References 21 publications

Optimized seismic retrofit of steel-concrete composite buildings

Optimized seismic retrofit of steel-concrete composite buildings

Theoretical and Experimental Study of Plate-Strengthened Concrete Columns under Eccentric Compression Loading

Flexural and axial strengthening of preloaded concrete columns under large eccentric loads by flat and precambered steel plates

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