The effects of retrofitting RC frames by X-bracing on the seismic performance of columns

Rahimi, Asghar; Maheri, Mahmoud R.

doi:10.1016/j.engstruct.2018.07.003

Cited by 36 publications

(16 citation statements)

References 20 publications

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“…The design of braced frames is nowadays common practice in buildings with steel and steel-concrete composite columns, but they have been used in reinforced concrete structures as well. Research on the utilization of steel bracings as a retrofit method started decades ago and is still active [27][28][29][30][31][32][33][34][35][36][37].…”

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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“…In [ 35 ], the following factors have been analysed: (i) the behaviour of RC columns before and after retrofitting with steel X-bracing, (ii) the possible complications, the increase in demand and the side effects of the latter retrofitting method. The study concludes that in high-rise frame buildings (in high-rise buildings, for frames located near the top), this retrofitting system has adverse effects on those columns that are attached to the bracing elements.…”

Section: State Of the Artmentioning

confidence: 99%

Specific seismic retrofitting of a compact reinforced concrete building with X-bracings and steel jackets. Application to a primary school in Huelva

et al. 2020

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Previous research has indicated that many European buildings are vulnerable to moderatemagnitude earthquakes. For example, during the L´Aquila (Italia, M w 6.3, 2009) and Lorca (Spain, M w 5.9, 2011) earthquakes, many old buildings were severely damaged and some of them collapsed. In specific, significant damage has been found in several school buildings a1111111111 a1111111111 a1111111111 a1111111111 a1111111111

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“…A. Rahimi, M.R. Maheri [30], [31] studied the effect of Xtype steel bracing in the 2D RC frame to understand the braced and unbraced performance of the structures. The result shows that adding the bracing in the RC frame reduces the inter-story drift and displacement.…”

Section: Introductionmentioning

confidence: 99%

Effect of position of steel bracing in L-shape reinforced concrete buildings under lateral loading

Bohara¹,

Ganaie²,

Saha³

2021

Res. Eng. Struct. Mater.

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The level of damage in irregular structures is more compared to regular structures. In this study, L shaped RC buildings are investigated with and without steel bracings in different positions in frames. The response spectrum analysis has been done by using ETABs software. The two cases considered, case I and case II for understanding the effect in inverted V bracing in L shape building. Case II shows the suitable seismic parameters when bracing is used properly. Interstory drift, displacements, base shear, fundamental time period, torsional irregularity ratio and the capacity ratio of the columns are evaluated. It is also noticed that adding the steel bracing decreases the inter-story drift, displacements of the structure effectively. The torsional irregularity ratio of each 12 models are studied carefully. The capacity ratio of the selected columns is studied to understand the performance of the columns while using the steel bracing in the buildings. The steel bracings are effectively used as retrofitting in L shaped buildings if the position of bracings are considered in the frames appropriately. While designing irregular buildings with steel bracings, the torsional effect should be checked.

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The effects of retrofitting RC frames by X-bracing on the seismic performance of columns

Cited by 36 publications

References 20 publications

Optimized seismic retrofit of steel-concrete composite buildings

Optimized seismic retrofit of steel-concrete composite buildings

Specific seismic retrofitting of a compact reinforced concrete building with X-bracings and steel jackets. Application to a primary school in Huelva

Effect of position of steel bracing in L-shape reinforced concrete buildings under lateral loading

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