Strengthening of RC frames by using high strength diagonal precast panels

Aksoylu, Ceyhun; Kara, Nail

doi:10.1016/j.jobe.2020.101338

Cited by 14 publications

(14 citation statements)

References 23 publications

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“…There is no direct consistency in terms of stiffness point of view since the initial stiffness of a test frame is dependent on some parameters such as the quality of the workmanship in the construction of the hollow brick infill wall and plastering of the specimen, which played an important role in the displacement history in early cycles. Altin et al(2012) 1.5 1.8 RC Infill- Altin et al (2012) 2.7 6.3 Plate- Akin and Sezer (2016) 3.1 6.8 Plate- Aksoylu and Sezer (2018) 1.8 2.1 Plate- Aksoylu and Kara (2020) 2.9 3.8…”

Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

“…In the studies conducted by Baran and Tankut (2011a, b), precast concrete panels were bonded on to plastered hollow bricks by means of epoxy material and it was proven experimentally that this technique is very effective in increasing the stiffness, lateral load and energy dissipation capacities of infilled RC frames whereas improving their seismic behaviour. Panels were also used by Kahn and Hanson (1979), Kaldjian and Yuzugullu (1983), Frosch et al (1996), Frosch (1999), Kesner and Billington (2005), Okuyucu (2011), Akin and Sezer (2016), Aksoylu and Sezer (2018), and Aksoylu and Kara (2020) in examining the behaviour of infilled frames. It was shown that the use of panels is an effective and convenient method to improve the frame strength and stiffness while reducing costs and saving of time.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of seismic performances of reinforced concrete frames strengthened by different techniques

Baran

2021

Lat. Am. j. solids struct.

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The aim of this study is to compare the seismic performances of strengthening techniques applied to reinforced concrete (RC) non-ductile frames tested under the effects of seismic loads. In the experimental part of the study, one-third scale, one-bay, two-storey non-ductile hollow brick infilled RC frames were strengthened with five different techniques and tested under reversed cyclic lateral loads. One being reference, five of the frames were infilled with hollow bricks and plastered on both sides, one was strengthened with plain mortar, one was strengthened with steel fiber reinforced mortar, two were strengthened with precast RC plates. The last frame was strengthened with RC infill wall. Strengthening techniques increased strength and stiffnesses of the frames in the ranges from 57% to 189% and from 186% to 486% respectively. In the numerical analysis part, an existing RC non-ductile building located in Istanbul, strengthened with the techniques, were analyzed using a computer program. Numerical results were evaluated in terms of interstorey drift ratio together with the overall seismic performance of the building.

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Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of seismic performances of reinforced concrete frames strengthened by different techniques

Baran

2021

Lat. Am. j. solids struct.

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“…Some researchers studied on improving the seismic performance of infilled frame systems. Aksoylu and Kara [29][30] investigated RC frames strengthened by precast infill panels by conducting experimental tests on five (1:3 scaled) specimens under reversed-cyclic lateral loading and proposed a technique to improve the response of such infilled frame system. They concluded that this type of strengthening increases the stiffness, load carrying capacity, and energy dissipation capacity of the infilled frame as well as it can control the drift values within the limits.…”

Section: Diagonal Strut Definitionmentioning

confidence: 99%

Investigating the Effect of Masonry Infill Walls on the 2D RC Structural Systems with Asymmetry along the Elevation

Alhalil

Güllü

2021

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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Reinforced concrete (RC) frames with unreinforced masonry infill panels are common structural building systems all over the world. Although many analytical investigations and experimental observations emphasize the contribution of masonry infills to the overall stiffness and strength of the structures, their effects are not considered by the engineers in the design and the analysis calculations. Due to the variations in the actual behavior of the infill walls and using different parameters to define the infill walls in modeling and capacity calculations, they have unpredictable effects on the global response of the structural systems. The purpose of this study is the simulation of a collapse mechanism scenario that may be developed during the earthquake through applying incremental equivalent static load. Infill panels were represented using equivalent compression diagonal struts and their effects on the behavior of RC structural systems having asymmetrical placement of unreinforced masonry infill walls along the elevation has been scrutinized. The equivalent static load was applied to the structural system in +/-X directions to focus on the effects of using only one diagonal strut. It has been observed that the influence of the infill panels on the structural system has beneficial effects in decreasing the story drift, which may be attributed to the contributory effect of the infill panels on the lateral stiffness of the structural system. Furthermore, the axial forces and bending moment diagrams have been plotted for each increment in the equivalent static load, which can give insight to understand the significance of masonry infill walls.

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“…Subsequently, this approach has been used as the basis for a number of standards (such as FEMA P-695 [38]) and by researchers [39][40][41][42][43][44][45][46] for the assessment of the hazard level of the structural model. In addition, a number of studies [47][48][49][50] have been conducted with the aim of strengthening the engineering structures. Some of the existing buildings could be seismically vulnerable because they were constructed without consideration to the seismic design standards, or before the seismic design regulations or the creation of more enhanced versions, as well as because of inappropriate building construction.…”

Section: Introductionmentioning

confidence: 99%

Conventional RVS Methods for Seismic Risk Assessment for Estimating the Current Situation of Existing Buildings: A State-of-the-Art Review

Bektaş

Kegyes-Brassai

2022

Sustainability

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Developments in the field of earthquake engineering over the past few decades have contributed to the development of new methods for evaluating the risk levels in buildings. These research methods are rapid visual screening (RVS), seismic risk indexes, and vulnerability assessments, which have been developed to assess the levels of damage in a building or its structural components. RVS methods have been proposed for the rapid pre- and/or post-earthquake screening of existing large building stock in earthquake-prone areas on the basis of sidewalk surveys. The site seismicity, the soil type, the building type, and the corresponding building characteristic features are to be separately examined, and the vulnerability level of each building can be identified by employing the RVS methods. This study describes, evaluates, and compares the findings of previous investigations that utilized conventional RVS methods within a framework. It also suggests the methods to be used for specific goals and proposes prospective enhancement strategies. Furthermore, the article discusses the time-consuming RVS methods (such as FEMA 154, which requires from 15 to 30 min, while NRCC requires one hour), and provides an overview of the application areas of the methods (pre-earthquake: FEMA 154, NRCC, NZEE, etc.; postearthquake: GNDT, EMS, etc.). This review of the traditional RVS methods offers a comprehensive guide and reference for field practitioners (e.g., engineers, architects), and recommends enhancement techniques (e.g., machine learning, fuzzy logic) for researchers to be used in future improvements.

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Strengthening of RC frames by using high strength diagonal precast panels

Cited by 14 publications

References 23 publications

Comparison of seismic performances of reinforced concrete frames strengthened by different techniques

Comparison of seismic performances of reinforced concrete frames strengthened by different techniques

Investigating the Effect of Masonry Infill Walls on the 2D RC Structural Systems with Asymmetry along the Elevation

Conventional RVS Methods for Seismic Risk Assessment for Estimating the Current Situation of Existing Buildings: A State-of-the-Art Review

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