Bidirectional effect of earthquake on low-rise RC frames with and without the consideration of In-plane effect of unreinforced masonry infill

Uprety, Rupesh; Suwal, Rajan

doi:10.1016/j.istruc.2022.11.099

Cited by 3 publications

(2 citation statements)

References 39 publications

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“…They performed a research work to predict the fundamental mode period of a RC frame structure with infills using artificial neural network. Uprety and Suwal (2023) performed bidirectional analysis of low-rise bare and infill frames and conducted seismic fragility assessment of the same. The result of the analysis clearly depicted that the performance of the structures was significantly impacted when the infills' effect was taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

Seismic fragility assessment of low-rise reinforced concrete frame: A comparative study of bare and infill model

Suwal

Uprety

2023

J. Eng. Iss. Solut.

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Most of the residential structures designed in Nepal are low-rise reinforced concrete (RC) frames. They are designed following the guidelines given in the Nepal Building Code, especially, the mandatory rule of thumb. In analyzing and designing most of the reinforced concrete structures in the urban and semi urban areas of Nepal, only bare frame model is considered. The additional effect caused by the infill walls are neglected. In this research, a comparative seismic fragility assessment of low-rise RC frame is conducted. Two cases are assumed; with and without the consideration of the unreinforced masonry infill. Macro modelling approach is followed for modelling the infill effect. Results clearly indicate that the inclusion of the infills drastically reduce the roof displacement compared to the bare frame model during a seismic shaking. This is attributed to the fact that the inclusion of the infill imparts more stiffness to the structure during a seismic-shaking compared to the bare frame model and hence the displacement is reduced. Furthermore, seismic fragility of the frame structure is also overstated when the effect of infill is not taken into consideration. The inclusion of infills reduced the structural fragility to significant extent. In this regard, the bare frame model was found to be more vulnerable to seismic shaking compared to the infill model.

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Section: Introductionmentioning

confidence: 99%

Seismic fragility assessment of low-rise reinforced concrete frame: A comparative study of bare and infill model

Suwal

Uprety

2023

J. Eng. Iss. Solut.

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“…In 2021, the infill wall interaction amplifying the torsional response of buildings at the bottom story was discussed [15], and it was proved that the infill walls have altered the load-resisting path and effectively enhanced the load redistribution ability for the frames [16,17], depending on the construction sequences of the infilled frames [18]. Moreover, infill walls can contribute to a lateral strength increase of up to 60% compared to bare frames [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Infills on the Response Modification Factor for Infilled Reinforced Concrete Frame Buildings

Helmy,

Okail,

Zidan

2023

Civ Eng J

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RC frames with unreinforced masonry infill walls are the most common type of building. Unreinforced masonry walls are often not considered by engineers in the design process, although walls and frames interact during strong ground motion, leading to structural responses deviating radically from what is expected in the design. Under lateral load, reinforced concrete confining members (frames) act in tension or compression, depending on the direction of the lateral seismic pressures. Meanwhile, masonry walls act as diagonal struts prone to compression. This research aims to develop the effect of masonry infills and their distribution on the value of the resulting response modification factor. For this purpose, a parametric study was performed on five, seven, and ten-story' buildings modeled as bare and infilled frames. Infill ratio, panel aspect ratio, unidirectional eccentricity, and bidirectional eccentricities were the parameters investigated. Each proposed model's resulting response modification factor was compared to the value cited in different international codes. It was concluded that this value differs depending on several parameters and cannot be constant for a certain structural system. The novelty of this research is the deduction of a general equation to calculate the response modification factor as a function of the percentage of infills and the eccentricity, while presenting two different methods to calculate it. Doi: 10.28991/CEJ-2023-09-12-09 Full Text: PDF

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Effect of earthquake components on global and local response of RC moment resisting frames

Uprety

Suwal

2023

Asian J Civ Eng

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Bidirectional effect of earthquake on low-rise RC frames with and without the consideration of In-plane effect of unreinforced masonry infill

Cited by 3 publications

References 39 publications

Seismic fragility assessment of low-rise reinforced concrete frame: A comparative study of bare and infill model

Seismic fragility assessment of low-rise reinforced concrete frame: A comparative study of bare and infill model

Effect of Infills on the Response Modification Factor for Infilled Reinforced Concrete Frame Buildings

Effect of earthquake components on global and local response of RC moment resisting frames

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