An extended multiple-strut model to estimate infill effects on multi-storey steel frames with different connection rigidities

Pashaie, Mohammad Reza; Mohammadi, Mitra

doi:10.1016/j.istruc.2020.12.035

Cited by 5 publications

(4 citation statements)

References 51 publications

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“…This section briefly describes the considered equivalent strut models i.e., the singlestrut model by Liberatore and Decanini [6] and the three-strut model by Pashaie and Mohammadi [12]. A schematic view of both models is provided in Fig.…”

Section: Strut Modelsmentioning

confidence: 99%

“…Previous analytical, numerical, and experimental studies have been conducted on masonry-infilled steel frames [e.g., 8,9,10,11,12], but designated proposals of strut models for steel frames are still very limited. One of the earliest studies was conducted by El-Dakhakhni et al [8], who reported that the surrounding steel frame was able to provide enough confinement to the infill panel through the contact lengths over beams and columns, allowing it to continue carrying lateral loads after cracking.…”

Section: Introductionmentioning

confidence: 99%

“…Since it is not possible to simulate this behaviour by adopting the single-strut model, the authors employed three-struts in each diagonal direction to account for the presence of contact lengths. Over a decade later, Yekrangnia and Mohammadi [11] and Pashaie and Mohammadi [12] proposed another two three-strut models based on numerical analyses, which considered the fundamental parameters of masonry-infilled steel frames, including the aspect ratio, wall-to-frame relative stiffness and friction between brick units.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Modelling of Masonry Infill Walls in Existing Steel Frames Against Experimental Results

Di Sarno,

Wu,

Freddi

et al. 2022

Lecture Notes in Civil Engineering

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The presence of masonry infills may significantly affect the seismic behaviour of existing steel moment-resisting frames, characterised by low lateral force resistance and inadequate energy dissipation capacity due to the lack of seismic detailing. Masonry infills may cause variation of internal force distribution along beams and columns, resulting in large local seismic demands at beamcolumn joints and consequently leading to soft-storey mechanisms. Several numerical models have been developed to account for the effects of masonry infills, among which the equivalent strut models were most widely used. However, it has been argued that despite its ability to capture the global response of structures, the single-strut model may not be adequate to correctly simulate the internal forces distributions in steel members. To this end, the present study investigates modelling strategies of infilled steel frames using both single-and three-strut models. The results from different modelling approaches are compared among them and with experimental tests, providing insights on the influence of the modelling strategies both at global and local levels.

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Section: Strut Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Modelling of Masonry Infill Walls in Existing Steel Frames Against Experimental Results

Di Sarno,

Wu,

Freddi

et al. 2022

Lecture Notes in Civil Engineering

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“…Several single-and multiple-struts models have been proposed in literature, the majority of which were calibrated based on experimental studies on RC structures [e.g., [27][28][29]. Meanwhile, a limited number of proposals in literature have focused on the modelling of infill walls in steel frames [e.g., [30][31][32]. Despite being significantly simpler than micro-models, multiple-struts models can still be complex and difficult to implement in the case of large structures characterised, for example, by multiple storeys and spans with varying heights and widths.…”

Section: Introductionmentioning

confidence: 99%

Modelling of masonry infills in existing steel moment-resisting frames: Nonlinear force-displacement relationship

Sarno²,

Freddi³

et al. 2022

Engineering Structures

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Displacement incompatibility shape functions between masonry infill wall panels and reinforced concrete frames

Pedone

Pampanin

2023

Bull Earthquake Eng

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During an earthquake, the detachment and local interaction between infill wall panels and surrounding frame can occur, potentially leading to significant local damage to both structural and non-structural elements, if not global collapse. Yet, a procedure to assess the relative deformation mechanism in terms of detachment shape and values, rather than, and in addition to, the diagonal compression strut mechanism and associated internal panel strain and stress path, is still missing in the literature. Therefore, in this paper the concept of shape functions is proposed and adopted to assess the seismic displacement incompatibility between infill walls and the surrounding frame structure. A parametric study on different typologies of infilled frames is developed to investigate the key parameters affecting the infill-frame detachment. The proposed concept of shape functions can support the design/retrofit of improved construction details, such as shear keys and/or steel dowels, in view of either decoupling or strengthening retrofit/repair strategies. Moreover, as infill-frame detachment can lead to damage to energy enhancement rehabilitation solutions, such as external thermal insulation systems, which are becoming more common nowadays in view of the international target towards a significant reduction of energy consumption and CO2 emission, it is suggested to implement the proposed displacement-compatible design check to assess and detail for adequate displacement capacity.

show abstract

An extended multiple-strut model to estimate infill effects on multi-storey steel frames with different connection rigidities

Cited by 5 publications

References 51 publications

Numerical Modelling of Masonry Infill Walls in Existing Steel Frames Against Experimental Results

Numerical Modelling of Masonry Infill Walls in Existing Steel Frames Against Experimental Results

Modelling of masonry infills in existing steel moment-resisting frames: Nonlinear force-displacement relationship

Displacement incompatibility shape functions between masonry infill wall panels and reinforced concrete frames

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