Empirical Models for Lateral Stiffness and Strength of Masonry-Infilled RC Frames Considering the Influence of Openings

Basha, Syed Humayun; Surendran, Sachin; Kaushik, Hemant B.

doi:10.1061/(asce)st.1943-541x.0002562

Cited by 18 publications

(10 citation statements)

References 44 publications

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“…The lateral load-carrying capacity of the semi-rigid steel frame V f is primarily contributed from the plastic bending deformation of the top and seat angles and the load applied to the two web angles, which can be predicted using Equation (8). 80 The bending moment of the semi-rigid steel frame M f with four identical semi-rigid joints can be estimated as Equation ( 9).…”

Section: Bare Semi-rigid Steel Framementioning

confidence: 99%

“…[4][5][6][7] Moreover, severe deformation of the inevitable door openings on the infill wall might aggravate such undesirable effects, given the absence of standardized door opening numbers and locations. 8 However, capturing the actual seismic responses of frames with infill walls constructing door openings is challenging, as most seismic design specifications do not adequately account for this intricate interaction during the structural design process. [9][10][11] To mitigate the detrimental infill-frame interaction, three solutions are of most interest currently [12][13][14][15] : strengthening the infill wall, decoupling the infill wall from the surrounding frame, and incorporating a sliding mechanism into the infill wall.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and analytical studies of infill wall with sliding joints considering a door opening

Huang,

Niu,

Zhang

et al. 2024

Earthq Engng Struct Dyn

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Semi‐rigid steel frame stands out due to its remarkable deformation capability under seismic loading, while the introduction of partitioned walls would disturb the expected seismic behavior of the infilled steel frames. Furthermore, the presence of door openings might exacerbate these negative effects. To mitigate the detrimental multiple‐diagonal strut effect of traditional infill walls around the door opening, an innovative low‐damage wall panels system: prefabricated infill wall panels with a door opening and sliding joints are presented for semi‐rigid steel frames. For testifying the effectiveness of the proposed structure, a quasi‐static test was carried out on three half‐scaled steel frames: a bare frame, a frame infilled with conventional wall panels with a door opening, and a frame infilled with the novel wall panel system with a door opening. Experimental results reveal that the developed innovative wall panels with a door opening could avoid unfavorable crack developments and opening deformation around the door area. It is mainly attributed to the releasement of the adverse multiple‐diagonal strut mechanism of traditional wall panels with door openings. Thus, the presented infilled frame showcases seismic performance similar to the bare steel frame, while having a higher energy dissipation capacity. Moreover, the developed analytical prediction method based on the superposition principle could accurately estimate the lateral load‐carrying capacity of the structures. Due to negligible deformation of the both bottom infill wall panel and the door opening, the innovative infill wall only contributes about 10% lateral load‐carrying capability to the infilled frame.

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Section: Bare Semi-rigid Steel Framementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and analytical studies of infill wall with sliding joints considering a door opening

Huang,

Niu,

Zhang

et al. 2024

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

show abstract

“…Additionally, it is found that the size and location of openings have a significant effect on the seismic performance of infilled frames. Available tests on infilled frames with openings are significantly less than those made for solid ones (Mohammadi & Nikfar 32 ), among these Dawe and Seah, 33 Mosalam et al, 34 Tasnimi and Mohebkhah 35 tested one-storey steel-infilled frames, while most of the experimental works focused on reinforced concrete infilled frames (e.g., Kakaletsis & Karayannis, [36][37][38] Blackard et al, 39 Sigmund & Penava, 40 Zhai et al, 41 Mansouri et al, 42 Morandi et al, 43 Basha et al 44 ). Full-scale reinforced concrete multi-storey frames including both solid infills and infills with openings were also tested by Carvalho and Coelho, 45 Al-Chaar et al, 46 and Stavridis et al 47 In consideration of the results from the experimental tests, different authors provided empirical relationships to effectively modify the equivalent strut approach to consider the strength and stiffness reduction due to the presence of the openings.…”

Section: Noveltymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cyclic response of infilled RC frames with window and door openings: Experimental results and damage interpretation

Di Trapani,

Khan,

Zhou

et al. 2023

Earthq Engng Struct Dyn

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The paper presents the results of an experimental investigation assessing the influence of the openings typology and position on the cyclic response of masonry‐infilled reinforced concrete frames. The experimental program consisted of seven 2/3 scale square frame specimens infilled with hollow clay bricks, which were subjected to quasi‐static lateral cyclic tests up to large drifts. A reference bare frame was also tested for comparison. The specimens included solid infill walls, infills with door openings, and infills with window central and eccentric openings. The experimental responses of the specimens were analyzed in terms of strength, stiffness, energy dissipation capacity, and equivalent damping, and were compared to those of the reference bare frame and fully infilled frame. Results revealed a significant modification of the resisting mechanisms as a function of the typology and position of the openings with respect to the case of a fully infilled frame, although the lateral resisting capacity was not substantially modified. On the other hand, it was observed that the achievement of the limit state thresholds occurred at substantially different interstorey drifts, indicating different damage metrics. Simple regression analyses, based on the experimental results of this study and from the literature, were finally conducted to interpret the modification of the peak force and of the corresponding drift as a function of synthetic parameters defining the opening arrangement.

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“…To simulate the presence of openings, the most common approach consists of indirectly reduce the strength and the stiffness of the infill panel depending on the opening size, reducing the width of the diagonal strut by adopting an approximate reduction factor [39,46,[52][53][54][55]. However, some authors evidenced that both the location [52] and the shape ratio [54] of openings influence the frame global performance and, in some cases, it can lead to the development of brittle shear failure (e.g., in the case of partiallyinfilled frame).…”

Section: Single-strut Constitutive Lawmentioning

confidence: 99%

Effect of Masonry Infill Constitutive Law on the Global Response of Infilled RC Buildings

2021

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Masonry-infilled reinforced concrete frames represent a very common construction typology across the Mediterranean countries. The presence of infills substantially modifies the global seismic performances of buildings in terms of strength, stiffness, and energy dissipation. Although several research studies focused on the overall performances of infilled reinforced concrete frames, the modeling of infill panels remains an open issue due to the complex interaction between the infill and the frame and the uncertainties involved in the definition of the problem. In the present paper, an existing masonry-infilled RC frame designed according to obsolete seismic codes is chosen as a case study. A refined three-dimensional finite element model is built for performing nonlinear static and time-history analyses in order to investigate some significant aspects related to the modeling of infills. In particular, it is investigated the effect of different infill constitutive models on the seismic performance of infilled RC building expressed in terms of engineering demand parameters such as interstory drift ratios and peak floor accelerations, and on the generation of damage fragility curves.

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Empirical Models for Lateral Stiffness and Strength of Masonry-Infilled RC Frames Considering the Influence of Openings

Cited by 18 publications

References 44 publications

Experimental and analytical studies of infill wall with sliding joints considering a door opening

Experimental and analytical studies of infill wall with sliding joints considering a door opening

Cyclic response of infilled RC frames with window and door openings: Experimental results and damage interpretation

Effect of Masonry Infill Constitutive Law on the Global Response of Infilled RC Buildings

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