Application of a New Anchorage towards the Flexural Strengthening of RC Rectangular Beams with External Steel Tendons

Hong, Sung-Jong; Cho, Dooyong; Park, Sun-Kyu

doi:10.3390/app6050119

Cited by 3 publications

(7 citation statements)

References 6 publications

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“…Since the crack in this period is much larger than the previous step from 1100 to 2100, the propagating stress wave attenuates more than the previous period. The cycles (6)(7)(8)(9)(10)(11) shown in the damage index are more clear than the previous cycles (1)(2)(3)(4)(5). In addition, the highest values of the damage index reached to one, which implies the concrete column was subject to severe damage in the maximum displacement of each cycle.…”

Section: Wavelet Packet-based Structural Damage Indicesmentioning

confidence: 84%

“…Xj is the decomposed sensor signal and j is the frequency band (j = 1 … 2 n ). Xj can be expressed in Equation (1).…”

Section: Smart Aggregate-based Structural Health Monitoring Systemmentioning

confidence: 99%

“…Step 2100, the concrete column was subject to five initial simulated pseudo-dynamic loading cycles (1)(2)(3)(4)(5), as shown in Figure 9. When load increased, the bottom cracks opened and the structural damage increased.…”

Section: Wavelet Packet-based Structural Damage Indicesmentioning

confidence: 99%

“…Reinforced concrete (RC) is the most common material used in infrastructure such as bridges [1,2]. RC columns are often the primary elements of energy dissipation in bridges subjected to seismic loads.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic Crack Monitoring of a Reinforced Concrete Column under Simulated Pseudo-Dynamic Loading Using Piezoceramic-Based Smart Aggregates

Robert²,

et al. 2016

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Structural health monitoring is an important aspect of maintenance for bridge columns in areas of high seismic activity. In this project, recently developed piezoceramic-based transducers, known as smart aggregates (SA), were utilized to perform structural health monitoring of a reinforced concrete (RC) bridge column subjected to pseudo-dynamic loading. The SA-based approach has been previously verified for static and dynamic loading but never for pseudo-dynamic loading. Based on the developed SAs, an active-sensing approach was developed to perform real-time health status evaluation of the RC column during the loading procedure. The existence of cracks attenuated the stress wave transmission energy during the loading procedure and reduced the amplitudes of the signal received by SA sensors. To detect the crack evolution and evaluate the damage severity, a wavelet packet-based structural damage index was developed. Experimental results verified the effectiveness of the SAs in structural health monitoring of the RC column under pseudo-dynamic loading. In addition to monitoring the general severity of the damage, the local structural damage indices show potential to report the cyclic crack open-close phenomenon subjected to the pseudo-dynamic loading.

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Section: Wavelet Packet-based Structural Damage Indicesmentioning

confidence: 84%

“…Xj is the decomposed sensor signal and j is the frequency band (j = 1 … 2 n ). Xj can be expressed in Equation (1).…”

Section: Smart Aggregate-based Structural Health Monitoring Systemmentioning

confidence: 99%

Section: Wavelet Packet-based Structural Damage Indicesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cyclic Crack Monitoring of a Reinforced Concrete Column under Simulated Pseudo-Dynamic Loading Using Piezoceramic-Based Smart Aggregates

Robert²,

et al. 2016

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“…Moreover, it is a popular technique for constructing long-span bridges because of its short construction time and low cost [30][31][32]. The advantages of internal or external tendon systems compared with bonding techniques have been widely studied and are enumerated as follows [2,3,18,[28][29][30]32,33]:…”

Section: Introductionmentioning

confidence: 99%

Post-Tensioning Steel Rod System for Flexural Strengthening in Damaged Reinforced Concrete (RC) Beams

2018

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In this study, a post-tensioning method using externally unbonded steel rods was applied to pre-damaged reinforced concrete beams for flexural strengthening. Nine simply-supported beams, three reference beams and six post-tensioned beams, were subjected to three-point bending. The design parameters observed in this study were the amount of tension reinforcements (3-D19, 4-D19, and 2-D22 + 2-D25; “D” indicates the nominal diameter of the rebar) and the diameters of the external rod (φ22 mm and φ28 mm). A V-shaped profile with a deviator at the bottom of the mid-span was applied to the pre-damaged beams, and a post-tensioning force was added to overcome the low load resistance and deflection already incurred in the pre-loading state. The post-tensioning force caused by tightening the nuts at the anchorage corresponded to a strain of 2000 με in the external rods; this value was approximately equal to the strain caused by torque that two adults can apply conveniently. The post-tensioning system increased the load-carrying capacity and flexural stiffness by approximately 40–112% and 28–73%, respectively, when compared with the control beams. However, the external rods did not yield in the post-tensioned beam with larger steel reinforcements and external steel rods. The external rod with the larger diameter increased the flexural strength more effectively.

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Effect of External Post-Tensioning Strengthening Technique on Flexural Capacity of Simple Supported Composite Castellated Beam

Al-Zuhairi

2021

E3S Web Conf.

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This research is carried out to study the effect of the external post-tensioning technique on the flexural capacity of simply supported composite castellated beam experimentally. In this research, seven composite castellated beams having the same dimensions and material properties were cast and tested up to failure by applied two concentrated loads at 700 mm from each end. Two external strands of 12.7 mm diameter were fixed at each side of the web of strengthening beams and located at depth 180 mm from top fiber of the section (dps) at each end of the beam. The strands have been tensioned by using a hydraulic jack with a constant stress of 100 MPa. This research aims to study the effect of the strengthening by different shapes of strand profiles of external post-tensioning techniques on the flexural capacity of the composite castellated beam. These beams were divided into three groups. Each group contained two composite castellated beams while 7th composite castellated beam kept without strengthening by external post-tensioning technique As control beam. The first group included two beams with straight strand profile of external Post-tensioning. The second group included two beams with a triangular strand profile of external post-tensioning. The third group included two beams with a trapezoidal strand profile of external post-tensioning. All composite castellated beams were simply supported, and all of them were fully shear connections between the concrete slab and steel girder. All beams included the 16 castellated openings and were stiffened by six stiffener plates welded on the web of castellated beams. Three stiffener plates are welded on each side of the web. Two of these stiffener plates welded at the middle of the beam, and four of them welded at locations under the loads. The experimental results of this research were increasing 5.43% in load capacity of an average of the straight profile of composite castellated beams, increasing 18.92% in load capacity of an average of triangular profile composite castellated beams, and increasing 20.71% in load capacity of the trapezoidal profile of composite castellated beams. All the above results were compared with control beams.

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Application of a New Anchorage towards the Flexural Strengthening of RC Rectangular Beams with External Steel Tendons

Cited by 3 publications

References 6 publications

Cyclic Crack Monitoring of a Reinforced Concrete Column under Simulated Pseudo-Dynamic Loading Using Piezoceramic-Based Smart Aggregates

Cyclic Crack Monitoring of a Reinforced Concrete Column under Simulated Pseudo-Dynamic Loading Using Piezoceramic-Based Smart Aggregates

Post-Tensioning Steel Rod System for Flexural Strengthening in Damaged Reinforced Concrete (RC) Beams

Effect of External Post-Tensioning Strengthening Technique on Flexural Capacity of Simple Supported Composite Castellated Beam

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