The effects of steel X-brace retrofitting of RC frames on the seismic performance of frames and their elements

Rahimi, Asghar; Maheri, Mahmoud R.

doi:10.1016/j.engstruct.2019.110149

Cited by 41 publications

(23 citation statements)

References 24 publications

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“…in the study, the two cases are analyzed where the in case I, the inverted V bracings are used such a that it only applied in the incomplete ways or only added the bracings in a single axis of the structures and in case II the bracings are applied in both the directions as shown in Table 3. In both cases, the design base shear is observed in both directions as shown in Fig 3 . It is observed that adding the steel bracings increases the base shear values of the structure and similar results also observed in [28], [31]. In model L3, the bracings are added in such a way that it resist the lateral load along the yaxis.…”

Section: Design Base Shear Variationssupporting

confidence: 84%

“…The re-entrant corner behavior amplified the displacement along the x-axis [17]. It is noticed that in the case II (L9-L12) models, the steel bracings effectively reduced the maximum displacements [31] as shown in Fig. 5 and 6.…”

Section: Maximum Displacements Responsementioning

confidence: 85%

“…The story displacements of the irregular structures subjected to lateral loadings are a significant parameter for buildings design. The top story displacements response of the structures helps to understand the damage level of the structures [31]. While designing the structures, the lateral deformation and drift of the structures should be considered carefully, avoiding excessive deformation in the structures.…”

Section: Maximum Displacements Responsementioning

confidence: 99%

“…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%

See 3 more Smart Citations

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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Section: Design Base Shear Variationssupporting

confidence: 84%

Section: Maximum Displacements Responsementioning

confidence: 85%

Section: Maximum Displacements Responsementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…To effectively strengthen structures, the proper retrofitting method must be selected by evaluating the structure's seismic response before and after retrofit [21][22][23][24][25][26][27][28]. Among retrofitting methods, the insertion of shear walls in existing structures is practical and economical, and efficiently increases structure stiffness while decreasing deformation demand.…”

Section: Introductionmentioning

confidence: 99%

Seismic Fragility Assessment of Columns in a Piloti-Type Building Retrofitted with Additional Shear Walls

Dang-Vu¹,

Shin²,

Lee³

2020

Sustainability

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This study evaluated the influence of additional shear walls, constructed on the first floor, as strengthening methods for a piloti-type building subjected to earthquake loadings. Piloti-type buildings are commonly designed as urban structures in many cities of South Korea. The existence of just columns on the first floor of the building is a feature that is advantageous from an architectural viewpoint, and yet has potential structural disadvantages. Such columns usually exhibit shear–axial failure, due to inherent vertical and horizontal irregularities and insufficient seismic reinforcements. Among several retrofitting methods, including additional braces, carbon fiber reinforced polymers, dampers, and so forth, this research considered reinforced concrete shear walls to improve the seismic responses of piloti buildings. A parametric analysis of the location of the retrofitted shear walls in a typical piloti building was implemented using the Zeus-NL program. Nonlinear time history analysis and incremental dynamic analysis were performed to comparatively evaluate the structure’s seismic responses and fragility curves before and after retrofit.

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A New Displacement‐based Design Procedure for the Retrofitting of RC Buildings with Steel Braces

2022

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This paper proposes a new displacement‐based methodology for the design of concentric steel‐brace retrofitting systems for RC framed buildings. It relies on deformation control for different levels of seismic intensity and explicitly considers the interaction between both structural systems. When dealing with the seismic assessment and strengthening of existing RC buildings, practitioners are likely to resort to the q‐factor approach, due to its simplicity and popularity for the design of new structures. However, in non‐seismically designed RC structures, the uncertainties associated to the nonlinear behaviour are relevant, making it therefore very difficult to define a direct correlation between the real internal forces that develop in structural members during the seismic excitation, and those experienced by an equivalent indefinitely elastic structure. Consequently, several authors have argued that the force‐based seismic assessment and retrofitting of existing RC structures will not yield, in general, satisfactory results. The design methodology proposed herein thus addresses this limitation, offering a solution which is intuitive and fit to be used in practical applications, while providing retrofitted structures with adequate and more predictable seismic performance.

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The effects of steel X-brace retrofitting of RC frames on the seismic performance of frames and their elements

Cited by 41 publications

References 24 publications

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

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

Seismic Fragility Assessment of Columns in a Piloti-Type Building Retrofitted with Additional Shear Walls

A New Displacement‐based Design Procedure for the Retrofitting of RC Buildings with Steel Braces

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