Behaviour of reinforced concrete frames rehabilitated with concentric steel bracing

Abou-Elfath, Hamdy; Ghobarah, A.

doi:10.1139/l99-092

Cited by 43 publications

(10 citation statements)

References 3 publications

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“…With the development of the concept of incorporating shear links with seismic bracings, researchers and structural engineers have already represented its credible performances compared to standard steel bracings systems. Based on a number of studies, it is clear that this system was developed for both steel and concrete structures [1,2]. Research works are still going on to develop the bracing pattern with or without links.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Vertical Irregularity in Steel Braced Frames on Response to Earthquake

Sazzad¹,

Azad²,

SamdaniAzad³

et al. 2018

JCEA

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This paper deals with the irregular profile of braced steel frame building in vertical direction with shear link bracing systems. The underlying fact of the paper is the effect of seismic force in braced frames with different types of irregularities including mass irregularity, mass discontinuity and overhanging mass. For each successive model, the position of shear link bracings has been fixed to make the study effective. This study has investigated the vulnerable effect of irregular profiles in steel frame buildings. To attain the behavior of each frame, linear time history analysis method has been adopted for the present study. FEMA356 standard has been used here for linear time history analysis. Investigations on different frames exhibit that regular profile with symmetry in mass is more efficient while using overhanging mass is detrimental considering the time dependent displacements and accelerations.

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Section: Introductionmentioning

confidence: 99%

“…Research works are still going on to develop the bracing pattern with or without links. Studies with vertical shear links depict that they provide more lateral stiffness to withstand the seismic force [1]. The bracings are provided not only in regular shaped framed structures but also in irregular shaped framed structures.…”

Section: Introductionmentioning

confidence: 99%

Effects of Vertical Irregularity in Steel Braced Frames on Response to Earthquake

Sazzad¹,

Azad²,

SamdaniAzad³

et al. 2018

JCEA

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show abstract

“…An RC school building was retrofitted using posttensioned rod braces, which resulted in an increased moment capacity, rather than increased ductility [13]. Research has shown that direct connections between the concrete structure and the bracings result in superior structural properties in terms of earthquake resistance [9,[14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Hybrid Noncompression CF Bracing and GF Sheet Wrapping Reinforcement Method to Restore Damaged RC Structures

Lee

2015

Shock and Vibration

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We describe a novel technique for restoration of reinforced concrete (RC) structures that have sustained damage during an earthquake. The reinforcement scheme described here is a hybrid seismic retrofitting technique that combines noncompression X-bracing using CF with externally bonded GF sheets to strengthen RC structures that have sustained damage following an earthquake. The GF sheet is used to improve the ductility of columns, and the noncompression CF X-bracing system, which consists of CF bracing and anchors to replace the conventional steel bracing and bolt connections, is used to increase the lateral strength of the framing system. We report seismic restoration capacity, which enables reuse of the damaged RC frames via the hybrid CF X-bracing and GF sheet wrapping system. Cyclic loading tests were carried out to investigate hysteresis of the lateral load-drift relations, as well as the ductility. The GF sheet significantly improved the ductility of columns, resulting in a change in failure mode. The strengthening effect of conventional CF sheets used in columns is not sufficient with respect to lateral strength and stiffness. However, this study results in a significant increase in the strength of the structure due to the use of CF X-bracing and inhibited buckling failure of the bracing. This result can be exploited to develop guidelines for the application of the reinforcement system to restore damaged RC structures.

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“…An RC school building was strengthened using post-tensioned rod braces, which increased the moment capacity rather than increasing the ductility [11]. Direct connection has been shown to exhibit favorable earthquake resistance compared with indirect connection [1,[12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Non-Compression X-Bracing Systems Using Carbon Fiber Composite Cable for Seismic Strengthening of RC Buildings

Lee

2015

Polymers

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Cross-bracing (X-bracing) is one of the most popular methods of seismic retrofitting, and has been shown to significantly increase the structural stiffness and strength of buildings. Conventional steel X-bracing methods typically exhibit brittle failure at the connection between the brace and the building, or buckling failure of the braces. This study investigated the structural properties of a new type of non-compression X-bracing system using carbon fiber composite cable (CFCC). This non-compression X-bracing system uses CFCC bracing and bolt connections between structural members and the terminal fixer of the CFCC, instead of conventional steel bracing. The aim is to overcome the brittle and buckling failures that can occur at the connection and bracings with conventional steel X-bracing methods. We carried out cyclic loading tests, and the maximum load carrying capacity and deformation were investigated, as well as hysteresis in the lateral load-drift relations. The test results revealed that the CFCC X-bracing system installed in reinforced concrete frames enhanced the strength markedly, and buckling failure of the bracing was not observed.

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Behaviour of reinforced concrete frames rehabilitated with concentric steel bracing

Cited by 43 publications

References 3 publications

Effects of Vertical Irregularity in Steel Braced Frames on Response to Earthquake

Effects of Vertical Irregularity in Steel Braced Frames on Response to Earthquake

An Experimental Study on Hybrid Noncompression CF Bracing and GF Sheet Wrapping Reinforcement Method to Restore Damaged RC Structures

An Experimental Study on Non-Compression X-Bracing Systems Using Carbon Fiber Composite Cable for Seismic Strengthening of RC Buildings

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