Seismic Rehabilitation of Reinforced Concrete Frame Interior Beam-Column Joints with FRP Composites

Pantelides, Chris P.; Okahashi, Yasuteru; Reaveley, Lawrence D.

doi:10.1061/(asce)1090-0268(2008)12:4(435)

Cited by 104 publications

(41 citation statements)

References 16 publications

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“…This behavior is likely a result of a relatively long lap splice length (40d b ) and a low axial load level (0.1 f' c A g ). Even though this behavior was unexpected because the vast number of deficiencies of the as-built bent, similar results can be found in the literature (McLean et al 1998), (Pantelides and Gergely 2008). …”

Section: Comparison To Analytical Resultssupporting

confidence: 86%

Bridge Seismic Retrofit Measures Considering Subduction Zone Earthquakes

Dusicka¹,

Bazaez²,

Knoles³

2015

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Research was conducted to investigate the effect of subduction zone earthquakes on structural damage. The study suggests that large magnitude ground motions of long duration have the potential of significantly increasing the number of inelastic excursions and consequently incur more extensive structural damage as compared to ground motions with similar elastic spectral demands but of shorter duration. This increase in demand plays a crucial role in the Pacific Northwest where a mega subduction zone earthquake is impending. Typical reinforced concrete bridge bents constructed in the 1950 to mid-1970 in the State of Oregon were designed and built with minimum seismic considerations. This resulted in inadequate detailing within plastic hinge zones, leaving numerous RC bents highly susceptible to damage following an earthquake. In this study, the cyclic performance of an asbuilt RC square column and a reinforced concrete bridge bent retrofitted using buckling restrained braces (BRBs) was experimentally evaluated using quasi-static cyclic loading protocols aiming to reflect subduction zone earthquake demands up to displacement ductility. The buckling restrained braces were designed as replaceable elements in order to take the earthquake-induced energy and dissipate it through nonlinear hysteretic behavior. Two BRB designs were considered in the study in an effort to assess the influence of BRB stiffness on the overall structural performance. The results of these large-scale experiments successfully demonstrated the effectiveness of utilizing buckling restrained braces for achieving high displacement ductility of the retrofitted structure, while also controlling the damage of the existing vulnerable reinforced concrete bent up to the design performance levels. The potential of improving the overall seismic behavior and the design performance levels with BRBs offers structural design professionals a viable method for performance driven retrofit of reinforced concrete bents. 17. Key Words Subduction zone earthquakes, reinforced concrete bridge bents, plastic hinge zone, performance levels, bridge seismic retrofit, quasi-static loading protocol, buckling restrained braces.18. Distribution Statement: Copies available from NTIS, and online at

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Section: Comparison To Analytical Resultssupporting

confidence: 86%

Bridge Seismic Retrofit Measures Considering Subduction Zone Earthquakes

Dusicka¹,

Bazaez²,

Knoles³

2015

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“…In the context of beam-column subassembly, numerous studies have been carried out (El-Amoury 2004;Ghobarah and El-Amoury 2005;Karayannis and Sirkelis 2008;Pantelides et al 2008;Alhaddad et al 2012). In this area, different issues such as joint shear strengthening; increasing member stiffness and plastic hinge relocation have been investigated.…”

Section: Introductionmentioning

confidence: 99%

On the FE Modeling of FRP-Retrofitted Beam–Column Subassemblies

Ronagh

Baji

2014

Int J Concr Struct Mater

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The use of fiber reinforced polymer (FRP) composites in strengthening reinforced concrete beam-column subassemblies has been scrutinised both experimentally and numerically in recent years. While a multitude of numerical models are available, and many match the experimental results reasonably well, there are not many studies that have looked at the efficiency of different finite elements in a comparative way in order to clearly identify the best practice when it comes to modelling FRP for strengthening. The present study aims at investigating this within the context of FRP retrofitted reinforced concrete beam-column subassemblies. Two programs are used side by side; ANSYS and VecTor2. Results of the finite element modeling using these two programs are compared with a recent experimental study. Different failure and yield criteria along with different element types are implemented and a useful technique, which can reduce the number of elements considerably, is successfully employed for modeling planar structures subjected to in-plane loading in ANSYS. Comparison of the results shows that there is good agreement between ANSYS and VecTor2 results in monotonic loading. However, unlike VecTor2 program, implicit version of ANSYS program is not able to properly model the cyclic behavior of the modeled subassemblies. The paper will be useful to those who wish to study FRP strengthening applications numerically as it provides an insight into the choice of the elements and the methods of modeling to achieve desired accuracy and numerical stability, a matter not so clearly explored in the past in any of the published literature.

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“…Based on previous researches on rehabilitation of connections (Pantelides, Okahashi et al 2008, Ilki, Bedirhanoglu et al 2010) and damage mechanism of NS5 specimen, the detailing shown in the Figure 2 was used for the repair of connections. Flexural retrofitting of Beam and column of the specimens were gained by either one or two L-shaped CFRP laminates according to ACI440.…”

Section: Repaired Specimensmentioning

confidence: 99%

Behavior of Damaged Exterior RC Beam-Column Joints Strengthened by CFRP Composites

Beydokhty

Shariatmadar

2016

Lat. Am. j. solids struct.

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This paper presents an experimental investigation on the behavior of retrofitted beam-column joints subjected to reversed cyclic loading. The experimental program comprises 8 external beamcolumn joint connection subassemblages tested in 2 phases; one was the damaging phase and second was the repairing phase. The Beam-column joints were designed only for gravity loads. The joints had no beam-column joint transverse reinforcement and special stirrups in beam and column critical zones. These NonSeismically designed (NS) joints were damaged with different levels at the first phase of the experiment. In the second phase, the damaged joints were strengthened with externally bonded carbon-fibre-reinforced polymers (C-FRP) sheets. From the observed responses of the examined specimens it can be deduced that the technique of externally bonded retrofitting (EBR) using C-FRP sheets is appropriate for the rehabilitation of the joints seismic capacity. This technique had a significant improvement of the energy dissipation and the performance level and finally it leads to improved type of damages compared with the damage modes of the specimens during the initial loading. Shortcomings of the application of C-FRP sheets for practical use are also pointed out.

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Seismic Rehabilitation of Reinforced Concrete Frame Interior Beam-Column Joints with FRP Composites

Cited by 104 publications

References 16 publications

Bridge Seismic Retrofit Measures Considering Subduction Zone Earthquakes

Bridge Seismic Retrofit Measures Considering Subduction Zone Earthquakes

On the FE Modeling of FRP-Retrofitted Beam–Column Subassemblies

Behavior of Damaged Exterior RC Beam-Column Joints Strengthened by CFRP Composites

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