Design of Cold-Formed Steel Screw Connections with Gypsum Sheathing at Ambient and Elevated Temperatures

Chen, Wei; Ye, Jihong; Chen, Tao

doi:10.3390/app6090248

Cited by 20 publications

(24 citation statements)

References 18 publications

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“…Thus, the scatter of shear load-displacement curves of CFS screwed connections is significant, which may result in the deviation of the shear strength and initial shear stiffness. Similar phenomena can be found in the previous study (Chen et al , 2016). In addition, the scatter of displacement results and initial stiffness is significant, and the regularity of displacement and stiffness to the elevated temperatures is insignificant.…”

Section: Test Resultssupporting

confidence: 92%

“…Three type-K thermocouples are used to monitor the temperature on the surface of sheathing material (GPB and BMB ply). A detailed description of the test setup can be found in Chen et al (2016). A steady-state test procedure is conducted.…”

Section: Test Programmentioning

confidence: 99%

“…However, limited literature exists regarding the investigation of CFS screwed connections with sheathing boards at elevated temperatures. Chen et al (2016) conducted 200 monotonic tests of 1.0-mm-thick G550 (nominal yield strength of 550 MPa) CFS screwed connections with gypsum sheathing at elevated temperatures and proposed a reduction factor to predict the shear strength of these connections at elevated temperatures. However, Chen’s study did not test the effect of the parameters of the type and thickness of CFS on the shear strength of screwed connections at elevated temperatures, and the proposed reduction factor may not be suitable to those screwed connections assembled with other types and thicknesses of CFS.…”

Section: Introductionmentioning

confidence: 99%

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Residual shear capacity of cold-formed steel-to-sheathing screwed connections at elevated temperatures

Liu

Chen

et al. 2021

JSFE

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Purpose Most previous thermal-mechanical modeling of cold-formed steel (CFS) walls did not consider the failure of screwed connections under fire conditions because of the limited data of such connections at elevated temperatures. Design/methodology/approach In this study, 285 steady-state tests are conducted on CFS screwed connections with single-layer gypsum plasterboard (GPB) and Bolivian magnesium board (BMB) sheathing at ambient and elevated temperatures. The failure of these connections is described as the breaking of the loaded sheathing edge. Findings For the BMB sheathing screwed connections, hydrochloric acid gas is generated and released above 300°C, and the shear strength becomes much less than that of the GPB sheathing screwed connection above 370°C. Hence, BMB may not be suitable for use as the face-layer sheathing of CFS walls but is still recommended to replace GPB as the base-layer sheathing. The major influencing parameters on the shear strength of screwed connections are identified as the type of sheathing material and the loaded sheathing edge distance. Originality/value Based on the previous and present test results, a unified expression for the residual shear strength of screwed connections with GPB and BMB is proposed at ambient and elevated temperatures with acceptable accuracy. It can be used as the basic input parameter of the numerical simulation of the CFS structures under fire conditions.

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Section: Test Resultssupporting

confidence: 92%

Section: Test Programmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Residual shear capacity of cold-formed steel-to-sheathing screwed connections at elevated temperatures

Liu

Chen

et al. 2021

JSFE

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“…Equipped with α data, the slip factor (K) was calculated based on equation (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16) and is presented in Table 3-8. The results are in perfect correlation with the slip factor data which is gleaned from published results [136].…”

Section: Analytical Study On the Gypsum Board Structuralsupporting

confidence: 83%

Performance of hybrid cold-formed steel panels

Kasaeian¹

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There has been a significant worldwide increase in the use of cold-formed steel (CFS) in low-rise residential structures as an alternative to timber. Improving the understanding of the behaviour of cold-formed steel framed domestic construction is important considering the greatly increased worldwide demand for such structures. CFS structures are used in many parts of the world including areas of moderate to high seismic activity such as Japan, the United States, and New Zealand and areas with cyclonic winds such as some parts of Australia.Australia is at the forefront of this technology, and its systems are most advanced worldwide, although due to the low seismicity in this region, little attention has been paid into studying the behaviour of CFS structures under earthquakes. The current study is one of the very few that investigates the lateral load capacity of CFS structures in addition to other properties of these systems. Lateral load resisting capacity of this system is usually its Achilles heel. The common bracing methods are not capable of economically resisting the high demands imposed on the system in high seismic regions or high wind areas.This study aims at evaluating the extra capacities that can be obtained by some common or not-so-common additional material such as screw fixed gypsum board in isolation or in combination with fillers such as foam-concrete. The CFS structure made in combination with fillers is called HYBRID in the current study. The filler material restrains the buckling of studs to some extent and participates in carrying the loads. As part of this study, an innovative bracing system is developed that works well under earthquake loads. The brace allows dissipation of energy to occur through yielding of strap braces over a long length without any failure at the connections or at the tensioning units.

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“…Most of the available experimental studies of screw connections are mainly focused on commonly used sheathing material such as GB, OSB, and steel. Chen et al (2016), Fiorino et al (2007Fiorino et al ( , 2008, Peterman et al (2014), Vieira and Schafer (2012), Ye et al (2016), and Henriques et al (2017) performed experimental studies on GB and OSB under different loading and geometric conditions. Fewer studies cover other not-commonly used sheathing material.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on screw connections in cold-formed steel walls with cement sheathing

Abu-Hamd

2019

Advances in Structural Engineering

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This article presents an experimental study on the screw connections between cold-formed steel walls and cement-based boards such as fibercement boards and ferrocement boards. The effect of loading direction, type of sheathing, board thickness, and screw number and spacing were investigated. Tests were performed under shear which is perpendicular to the free edge and also under shear which is parallel to the free edge of the board to simulate the actual behavior of sheathed shear walls. In each case, the peak load and displacement, elastic load and displacement, elastic stiffness and ductility were found and compared to other cases. The results of the 20 test reported in the paper showed that connection strength obtained under parallel loading was much higher than those obtained under perpendicular loading while as the displacements obtained under parallel loading were much larger than those obtained under perpendicular loading. Consequently, the elastic stiffness values were found to be smaller under parallel loading than under perpendicular loading. The results also showed that fibercement boards had much higher strength than ferrocement board, and that the screw strength increased nearly linearly with the board thickness.

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Design of Cold-Formed Steel Screw Connections with Gypsum Sheathing at Ambient and Elevated Temperatures

Cited by 20 publications

References 18 publications

Residual shear capacity of cold-formed steel-to-sheathing screwed connections at elevated temperatures

Residual shear capacity of cold-formed steel-to-sheathing screwed connections at elevated temperatures

Performance of hybrid cold-formed steel panels

Experimental study on screw connections in cold-formed steel walls with cement sheathing

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