Effect of Openings on Structural Performance of Unreinforced Masonry Infilled Frames

Al-Chaar, Ghassan; Lamb, Gregory E.; Issa, Mohsen A.

doi:10.14359/12593

Cited by 3 publications

(1 citation statement)

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“…Infilled frames with openings due to the arrangement of windows and doors were investigated to a lesser extent. The results of experimental campaigns in which infilled frames were investigated under pure in-plane loading (Dawe and Seah 1989b;Mosalam et al 1997;Al-Chaar et al 2003;Kakaletsis and Karayannis 2008;Stavridis 2009;Tasnimi and Mohebkhah 2011;Mansouri et al 2014;Sigmund and Penava 2014) unambiguously show that the presence of openings leads to reduction of in-plane stiffness and strength. However, the level of reduction highly depends on the location, type and size of opening and has not been fully investigated so far.…”

Section: Introductionmentioning

confidence: 98%

Experimental results of reinforced concrete frames with masonry infills with and without openings under combined quasi-static in-plane and out-of-plane seismic loading

Milijaš

Marinković

Butenweg

et al. 2023

Bull Earthquake Eng

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Reinforced concrete (RC) frames with masonry infills can be encountered all over the world, especially in earthquake prone regions. Although masonry infills are usually not considered in the design process, in the case of seismic loading they are subjected to in-plane and out-of-plane forces that can act separately or simultaneously. In recent earthquakes it was observed that seismic loads can severely damage masonry infills or even cause their complete collapse, especially when the loads act simultaneously. Due to this, effects of interaction of in-plane and out-of-plane loads on seismic performance of masonry infills have received more attention recently. However, most of studies focus only on fully infilled frames, even though openings, such as windows and doors are essential parts of infills that substantially affect the seismic response of masonry infills. Therefore, this article presents the results of a comprehensive experimental study on nine full-scale traditional masonry RC frames infilled with modern hollow clay bricks for configurations with and without window and door openings under separate, sequential and combined in-plane and out-of-plane loading. Based on the results, a detailed comparison and interpretation for the different infill and loading configurations is presented. The test results clearly show the unfavourable influence of openings and combined loading conditions as well as the importance of the quality of execution of the circumferential mortar joint between infill and frame. The new findings can be used as a basis for the required development of innovative solutions to improve significantly the seismic performance of RC frames with masonry infills.

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Section: Introductionmentioning

confidence: 98%

Experimental results of reinforced concrete frames with masonry infills with and without openings under combined quasi-static in-plane and out-of-plane seismic loading

Milijaš

Marinković

Butenweg

et al. 2023

Bull Earthquake Eng

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Lateral Stiffness of Masonry Infilled Reinforced Concrete (RC) Frames with Central Opening

Mondal

Jain²

2008

Earthquake Spectra

118

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Window and door openings are inevitable parts of infill walls for functional reasons. Currently, publications like FEMA-273 and ATC-40 contain provisions for the calculation of stiffness of solid infilled frames mainly by modeling infill as a "diagonal strut." However, such provisions are not provided for infilled frames with openings. The present study proposes a reduction factor for effective width of diagonal strut over that of the solid reinforced concrete (RC) infilled frame to calculate its initial lateral stiffness when a central window opening is present. The study is based on initial lateral stiffness which is taken at 10% of the lateral strength of the infilled frames.

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Distribution of Shear Resistance Among Components of R. C. Frames With Masonry Infill Walls Containing Confined Door and Window Openings

Penava¹,

Anić²,

Sarhosis³

et al. 2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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In earthquake resistant design of r. c. frame structures with unreinforced masonry infill walls, containing different in size and position window and door openings, confining elements (tiecolumns) are crucial component of seismic detailing of the structure. Having construction of the masonry infill wall without confining elements along opening edges, seismic response prediction becomes unreliable, due to uncontrolled sequenced failure mode of masonry infill walls, its out-of-plane instability, unfavorable crack distribution and premature and total disintegration. Confining elements are not subdued to design as moment-resisting r. c. frames and their construction details are based on simple recommendations. The aim of this study is, by usage of calibrated computational micromodel in computer program ATENA 2D Eng, to determine the shear resistance distribution among components of r. c. frames with masonry infill walls, containing confined door and window openings, at damage grades in compliance with EMS-98 scale.

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Effect of Openings on Structural Performance of Unreinforced Masonry Infilled Frames

Cited by 3 publications

References 1 publication

Experimental results of reinforced concrete frames with masonry infills with and without openings under combined quasi-static in-plane and out-of-plane seismic loading

Experimental results of reinforced concrete frames with masonry infills with and without openings under combined quasi-static in-plane and out-of-plane seismic loading

Lateral Stiffness of Masonry Infilled Reinforced Concrete (RC) Frames with Central Opening

Distribution of Shear Resistance Among Components of R. C. Frames With Masonry Infill Walls Containing Confined Door and Window Openings

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