Effects of Central Opening in Masonry Infill on Lateral Behavior of Intermediate RC Frames

Ahani, Elshan; Mousavi, Mir Naghi; Rafezy, B.; Osmanzadeh, Fathollah

doi:10.1520/acem20180040

Cited by 10 publications

(13 citation statements)

References 12 publications

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“…According to the current study, the base‐shear of the infilled frame with 8% central opening is about 0.7–0.8 times that of the base‐shear of the solid infilled frame, which corresponds to a decrease of the base‐shear equal to 20%‐30%, at a corresponding lateral displacement ranging from 0.5 to 20 mm (Figure 7A). This decrease is almost the same with that resulted from the study conducted by Tekeli and Aydin 72 and Ahani et al 74 . as shown in Figure 7A (comparing the dashed‐blue and the dashed‐green curve with the solid‐red curve).…”

Section: Parametric Studysupporting

confidence: 89%

“…as shown in Figure 7A (comparing the dashed‐blue and the dashed‐green curve with the solid‐red curve). From Figure 7D it is observed that, according to the current study the base‐shear of an infilled frame with central opening equal to 20% is about 0.5–0.7 times that of the solid infilled frame after the 0.5 mm lateral displacement, which is almost the same ratio with that resulted from the study conducted by Ahani et al 74 . (comparing the dashed‐green curve with the solid‐red curve).…”

Section: Parametric Studysupporting

confidence: 84%

“…The numerical models of infilled frames with openings developed in this study are further validated using past experimental studies conducted by Kakaletsis and Karayannis, 25,27 and Tekeli and Aydin, 72 and numerical studies conducted by Akhoundi et al 73 . and Ahani et al 74 . Depending on the available data of each of the above studies, it is decided to use either the envelope curve obtained from the base‐shear versus displacement diagram (hysteresis curve) or from the push‐over curve.…”

Section: Parametric Studymentioning

confidence: 70%

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Numerical study of the seismic retrofitting of masonry‐Infilled RC frames with openings using TRM

Filippou

Kyriakides

Chrysostomou

2023

Earthq Engng Struct Dyn

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The seismic retrofitting of existing masonry-infilled reinforced-concrete (RC) frame buildings is one major challenge of earthquake risk mitigation. In this paper, the use of promising novel alternative composite material, namely textile reinforced mortar (TRM) for seismic retrofitting masonry-infilled RC frames with central openings is examined numerically, to the best knowledge of the authors, for the first time ever. This is achieved by performing a parametric study on a validated 2D numerical model of a three-story masonry-infilled RC frame with and without TRM considering different size of central openings. This parametric study aims to examine (i) the influence of central openings on the lateral response of masonry-infilled RC frames subjected to cyclic loading and (ii) the lateral response of the three-story masonry-infilled RC frame with central openings retrofitted with TRM under cyclic loading. From the results obtained in this study, it was concluded that TRM contributes to increase the lateral capacity, stiffness, and the dissipated energy of infilled frames with openings and at the same time provides a more ductile behavior by delaying the strength and the stiffness degradation of infilled frames due to openings and further by delaying or even preventing brittle failures that occur on infilled frames due to the presence of the opening. New stiffness reduction factors for infilled frames with openings, and for TRM-retrofitted infilled frames with openings are also proposed, which can be used with an equivalent compression strut model and with a tension tiemodel as an everyday practice tool for simulating infilled frames with central openings along the diagonal of the infill wall with and without TRM. A numerical sensitivity analysis is also performed aiming to investigate the influence of (i) the TRM reinforcement ratio and (ii) the type of mortar used for binding the textile reinforcement on the lateral response of the three-story masonry-infilled RC frame retrofitted with TRM subjected to cyclic loading. This study showed that by increasing the reinforcement ratio, or by using high-strength mortars for binding the textile reinforcement, the lateral capacity of infilled frames is increased leading to a more ductile behavior, but this increase is not proportional to the increase This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Section: Parametric Studysupporting

confidence: 89%

Section: Parametric Studysupporting

confidence: 84%

Section: Parametric Studymentioning

confidence: 70%

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Numerical study of the seismic retrofitting of masonry‐Infilled RC frames with openings using TRM

Filippou

Kyriakides

Chrysostomou

2023

Earthq Engng Struct Dyn

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“…There are numerous valuable historical buildings with complex architecture that impose researchers to replace the priceless experimental investigations by numerical modeling and assessing their behavior during the earthquakes (Milani et al, 2017;Valente et al, 2017). According to the outcomes of many studies (Sandoval and Roca, 2012;Ahani et al, 2019), the finite element method (FEM) is the most accurate and widely used tool for analyzing masonry structures, which are also used in numerical simulations of this research. In the current study, The Concrete Damaged Plasticity criterion, a modified form of the Drucker-Prager criterion, is used for numerical simulation (Kmiecik and Kaminski, 2011).…”

Section: -Numerical Studiesmentioning

confidence: 99%

In-plane retrofitting of masonry structures by using GFRP strips in the Bedjoints

Osmanzadeh¹,

Ahani²,

Rafezy³

et al. 2021

Preprint

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Many unreinforced masonry structures were vulnerable in the past earthquakes and required retrofitting. However, the vulnerability of masonry structures could solve by providing numerous retrofitting approaches, scarcity of appropriate methods that may provide a solution for the historical masonry structures with lesser effects on their façade is vehemently sensible. In this study, two one-third scale masonry wall specimens made by clay bricks were tested under constant vertical and cyclic lateral loading. The specimens consist of an unreinforced wall and a wall retrofitted by GFRP strips. This study investigates the seismic behavior of unreinforced masonry walls before and after using GFRP strips on their bedjoints. To this purpose, various patterns of using GFRP strips have been studied by simplified micro-modeling. The consequence indicates that the proposed retrofitting technique could improve the lateral strength and stiffness of the unreinforced masonry wall along with a considerable increase in the energy dissipation and ductility content, which leads to making a change in the behavior of the wall from brittle to ductile failure. The proposed method could apply to the modern historical structures in which cement mortar has been used as an adhesive between the masonry layers.

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“…The complicated geometric shape of many historical buildings constrains the modeling procedure even in FEM software in which the meshing is affected by numerous parameters, including convergence and unity problems. To solve this issue, new methods of modeling named simpli ed micro modeling and macro modeling with more simple geometry are used by the researchers (Betti and Galano, 2012; Vicente et al, 2018;Ahani et al, 2019). Predicting the behavioral content of masonries due to diversity of the used materials and load-displacement indices confronted with sensible errors.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Damage Content of Karbandi Using Frequency Domain Analysis (Case Study: Timche Haj-Mohammad-Qoli of Tabriz Historic Bazaar)

Ahani

2021

Preprint

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In this study, an alternate method of evaluating structural systems, especially for the sensitive structures with historical importance by applying Fourier Transform (FT) to the damage ratio of time history outcome in the frequency domain has been introduced. The concept of damage content (DC) regarding the mechanical characteristics of the used material, including plastic strain, failure plane, and ultimate load-bearing capacity, along with drift value, record selection criteria, and architectural aspects, have been employed. Due to its valuable aesthetic and architectural view, Timche Haj-Mohammad-Qoli of Tabriz Historic Bazaar, one of the traditional covered spaces with the complicated configuration of spatial masonry intersecting arches, was selected for the assessment in the current study. The required experimental samples for obtaining the mechanical properties and relevant geometrical measurements to prepare the numerical model of the structure obtained. The strong ground motions according to seismological and geological characteristics of the construction site selected. The records with different durations were merged by Fourier Transform (FT) and Damage Content (DC) analysis. According to the outcomes, the damage state of the structure due to the imposed strong motion at every stage of the lateral loading from the failure initiation to the final collapse was observable. As a direct outcome of this study, the vulnerability concerning the near-field earthquakes is more tangible than far-field earthquakes. The provided methodology could have proper use in future similar studies for evaluating the performance of the structures.

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Effects of Central Opening in Masonry Infill on Lateral Behavior of Intermediate RC Frames

Cited by 10 publications

References 12 publications

Numerical study of the seismic retrofitting of masonry‐Infilled RC frames with openings using TRM

Numerical study of the seismic retrofitting of masonry‐Infilled RC frames with openings using TRM

In-plane retrofitting of masonry structures by using GFRP strips in the Bedjoints

Evaluating the Damage Content of Karbandi Using Frequency Domain Analysis (Case Study: Timche Haj-Mohammad-Qoli of Tabriz Historic Bazaar)

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