FRP composites for seismic retrofitting of steel-concrete shear walls with steel encased profiles

Dan, Daniel; Nagy-György, Tamás; Stoian, Valeriu

doi:10.1201/b11396-166

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…Experimental tests on BRB strengthened RC frames have been carried out. However, the BRBs were connected by means of through-anchoring, which appears to be disadvantageous as mentioned earlier [22,23]. To the extent of our knowledge, the only experiments on BRBs connected by means of post-installed anchors to RC members were reported by Yooprasertchai and Warnitchai [24].…”

Section: Introductionmentioning

confidence: 99%

Retrofit of reinforced concrete frames with buckling‐restrained braces

Mahrenholtz

Lin

et al. 2014

Earthq Engng Struct Dyn

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SUMMARYDamage to buildings observed in recent earthquakes suggests that many old reinforced concrete structures may be vulnerable to the effects of severe earthquakes. One suitable seismic retrofit solution is the installation of steel braces to increase the strength and ductility of a building. Steel bracings have some compelling advantages such as their comparatively low weight, their suitability for prefabrication, and the possibility of openings for utilities, access, and light. The braces are typically connected to steel frames that are fixed to the concrete structure using post-installed concrete anchors along the perimeter. However, these framed steel braces are not without some disadvantages such as heavier steel usage and greater difficulties during the installation. Therefore, braces without steel frames appear to be an attractive alternative. In this study, braces were connected to gussets furnished with anchor brackets, which were fixed by means of a few post-installed concrete anchors. The clear structural system and the increased utilization of the anchors allowed the anchorage to be designed precisely and economically. The use of buckling-restrained braces (BRBs) provides additional benefits in comparison with conventional braces. BRBs improve the energy dissipation efficiency and allow the limitation of the brace force to be taken up by the highly stressed anchorage. Cyclic loading tests were conducted to investigate the seismic performance of BRBs connected with post-installed anchors used to retrofit reinforced concrete frames. The tests showed that the proposed design method is feasible and increases strength as well as ductility to an adequate seismic performance level.

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Section: Introductionmentioning

confidence: 99%

Retrofit of reinforced concrete frames with buckling‐restrained braces

Mahrenholtz

Lin

et al. 2014

Earthq Engng Struct Dyn

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“…The test result showed that although the BRB could provide additional strength, stiffness and energy dissipation, physical damage still occurred in the weak zone of the column where lap-splices were located. Dinu et al (2012) conducted an analysis on a weak RC frame with and without BRBs. The numerical results showed that although the strengthening solution reduced the overall damage in the structure, the seismic performance of the retrofitted frame was still unsatisfactory because of plastic deformations in the columns.…”

mentioning

confidence: 99%

Experimental and Analytical Studies on a Reinforced Concrete Frame Retrofitted with Buckling-Restrained Brace and Steel Caging

Jiaguang

Mei

et al. 2015

Advances in Structural Engineering

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A hybrid seismic retrofit scheme, which utilizes a buckling-restrained brace (BRB) to enhance the lateral strength, stiffness and energy dissipation capacity of a seismically-weak reinforced concrete (RC) frame and steel caging to improve the flexural and shear strength of the deficient RC columns and beam-column joints, is proposed. Cyclic quasi-static tests were performed on two half-scale one-story, and single-bay RC frames to evaluate the efficiency of the hybrid retrofit technique. The performance of the BRB, the steel caging, and the connections of the retrofitted frame were studied and found to be satisfactory. The BRB significantly increased the lateral load resistance and energy dissipation capacity of the frame, and the steel caging could effectively change failure mechanism of the RC frame by preventing column failure. Analytical models were developed with OpenSees to simulate the experimentally observed behaviors. Reasonable agreements were achieved between the numerical and experimental results.

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