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

Lee, Kang Seok

doi:10.3390/polym7091480

Cited by 14 publications

(18 citation statements)

References 19 publications

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“…Several studies demonstrated that through the use of steel braces enhances the seismic performance of the strengthened frame improving strength, stiffness and energy dissipation capacity. A specific category in the brace strengthening technique of existing RC frames concerns the use of X-type cable elements [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Reinforced Concrete Frames Strengthened by Tension-Tie Elements Under Cyclic Loading: Experimental Investigation

Liolios¹,

Efthymiopoulos²,

Mergoupis³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. The cyclic response of existing Reinforced Concrete (RC) frames upgraded using diagonal X-type steel elements as tension-ties is experimentally investigated. Test results of two single-story single-span RC frames subjected to cyclic imposed lateral deformations are presented. The dimensional and the reinforcement configurations of the examined frames are the same and represent typical RC frame structures that have been designed and constructed using old Code provisions without consideration of seismic design criteria. The columns of the tested frames have shear-critical character due to the inadequate amount of stirrups provided and their low height-to-depth ratio (short columns). The experimental program includes a bare frame and a strengthened one using a pair of two steel crossed tension-ties (X-type bracing).Emphasis is given to the unilateral behavior of the steel bracing elements that undertake only tension stresses. In a companion paper, the herein experimental results are simulated and used as a comparative basis for the calibration of a numerical approach concerning a typical example problem.

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Section: Introductionmentioning

confidence: 99%

Reinforced Concrete Frames Strengthened by Tension-Tie Elements Under Cyclic Loading: Experimental Investigation

Liolios¹,

Efthymiopoulos²,

Mergoupis³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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show abstract

“…The amount of the provided stirrups is rather low (∅6/200 mm) and their efficiency should be checked. The absence of significant vertical gravity loads on the columns has as result the appearance of alternative axial forces (positive and negative, not only negative ones) as is the case of only compressive axial forces reported in the literature [11,13,19]. A preliminary simulation has given for these alternative axial forces the order results of the about values from -48 kN to +37 kN for the columns and from -67 kN to +55kN for the beam.…”

Section: The Finite Element (Fe) Discretization Of the Rc Framesmentioning

confidence: 89%

“…An alternative technique that uses cable-like members as tension-ties instead of the common steel bracing has been proposed for seismic strengthening of RC frames [12,13]. Cable restrainers have also been used for concrete and steel superstructure movement joints in bridges [14].…”

Section: Introductionmentioning

confidence: 99%

Reinforced Concrete Frames Strengthened by Tension-Tie Elements Under Cyclic Loading: A Computational Approach

Liolios¹,

Chalioris²

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. An efficient numerical simulation of the seismic response of single-story single-span Reinforced Concrete (RC) frames strengthened using diagonal tension-tie elements is presented. The developed analysis is based, calibrated and verified on test results of bare and X-braced RC frames subjected to cyclic imposed lateral deformations described in a companion paper. The dimensional and the reinforcement configurations of the frames represent earlier RC frame structures that have been designed using old Code provisions without consideration of seismic design criteria and. The columns of the RC frames have shear-critical character due to the inadequate amount of stirrups provided and their low height-to-depth ratio (short columns). Therefore, an easy-to-apply strengthening technique using a pair of two steel crossed tensionties (X-type bracing) is applied and examined. For the numerical simulation, the unilateral behavior of the cable elements that undertake only tension stresses is strictly taken into account.Comparisons between the analytical curves derived from the numerical simulation and the experimental ones from the cyclic tests showed a very good agreement.

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“…The input seismic ground motion was set to 200 cm/s 2 using the Hachinohe wave (EW), under which the reference frame with no reinforcement applied underwent a collapse. Figure 28 shows the RC school building model before and after seismic strengthening, and the amount of seismic strengthening needed for the NBSD seismic control system was calculated by Equations ( 11)- (13). The equations were derived from the Newmark's equal energy criterion [51,52], which is the same method used by Japan to evaluate seismic energy absorption of seismic devices [7].…”

Section: Overview Of the Nonlinear Dynamic Analysismentioning

confidence: 99%

“…In attempts to addressing the disadvantages of conventional repair and retrofitting methods, as mentioned above, research has been actively carried out since the early 1990s on retrofitting methods using new composite materials, such as carbon fiber, Aramid fiber, and glass fiber [12][13][14][15][16]. These methods, however, also come with disadvantages as follows [16]:…”

mentioning

confidence: 99%

Seismic Strengthening of R/C Buildings Retrofitted by New Window-Type System Using Non-Buckling Slit Dampers Examined via Pseudo-Dynamic Testing and Nonlinear Dynamic Analysis

Lee

Jung

2022

Applied Sciences

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In the present study, a window-type seismic control system (WSCS) using non-buckling slit dampers (NBSDs) was proposed and developed to address the disadvantages of conventional seismic control systems so that it can be effectively applied to existing reinforced concrete (RC) buildings. Materials testing was also conducted to examine the material performance and energy dissipation capacity of NBSD. A full-scale two-story test frame modeled from existing RC buildings with non-seismic details was subjected to pseudo-dynamic testing. As a result, the effect of NBSD-WSCS, when applied to existing RC frames, was examined and verified, especially as to its seismic retrofitting performance. In addition, based on material testing and pseudo-dynamic test results, a restoring force characteristics model was proposed to implement the nonlinear dynamic analysis of a test building retrofitted with NBSD-WSCS. Based on the proposed restoring force characteristics, nonlinear dynamic analysis was conducted, and the results were compared with those obtained by the pseudo-dynamic tests. Finally, in an attempt to commercialize this NBSD-based WSCS, nonlinear dynamic analysis was conducted on the entire RC building with non-seismic details retrofitted with NBSD-WSCS. The results showed that the RC frame (building) with no reinforcement applied underwent shear failure at seismic intensity of 200 cm/s2, a typical threshold applied in seismic design in Korea. In contrast, in the frame (building) retrofitted with NBSD-WSCS, only minor earthquake damage was expected, and even when the seismic intensity was set to 300 cm/s2, the maximum intensity that had been observed in Korea, only small or moderate seismic damage was expected. These results confirmed the effectiveness of the seismic retrofitting method using NBSD-WSCS developed in the present study.

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

Cited by 14 publications

References 19 publications

Reinforced Concrete Frames Strengthened by Tension-Tie Elements Under Cyclic Loading: Experimental Investigation

Reinforced Concrete Frames Strengthened by Tension-Tie Elements Under Cyclic Loading: Experimental Investigation

Reinforced Concrete Frames Strengthened by Tension-Tie Elements Under Cyclic Loading: A Computational Approach

Seismic Strengthening of R/C Buildings Retrofitted by New Window-Type System Using Non-Buckling Slit Dampers Examined via Pseudo-Dynamic Testing and Nonlinear Dynamic Analysis

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