Experimental study of screw connections in CFS-calcium silicate board wall panels

Nithyadharan, M.; Kalyanaraman, V.

doi:10.1016/j.tws.2011.01.004

Cited by 56 publications

(22 citation statements)

References 11 publications

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“…Thus, Equation (1) is able to accurately evaluate the shear strength of the screw connection with single-or double-layer gypsum sheathing and different edge distances at ambient and elevated temperatures. In structural engineering design, if the loaded edge distance exceeds 20 mm, Equation (1) can still be used with the loaded edge distance of 20 mm to obtain a conservative prediction of the shear strength of the screw connection, and a factor of safety [25] can be applied to the maximum allowable axial strength of the screw connection, as shown in Equation (5).…”

Section: Shear Strength Designmentioning

confidence: 99%

“…Several experimental investigations [3][4][5][6][7][8][9] have already been conducted on the shear response of screw connections with gypsum sheathing or other board materials at ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the effect of the loading rate, steel thickness, loaded edge distance and loading protocol were also discussed with explicit conclusions [5][6][7][8][9]. Some mathematical models, such as the Foschi model [10], Pivot model [9,11] and Pinching 4 model [7], were used to describe the monotonic or cyclic load-displacement characteristic of connections at ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

“…However, previous research [3][4][5][6][7][8][9] mainly focused on screw connections with only a single layer of sheathing material at ambient temperature. In mid-rise buildings, double layers of gypsum sheathing are necessary on both sides of load-bearing CFS walls to satisfy the fire resistance rating of at least 60 min [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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

Chen

2016

Applied Sciences

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Load-bearing cold-formed steel (CFS) walls sheathed with double layers of gypsum plasterboard on both sides have demonstrated good fire resistance and attracted increasing interest for use in mid-rise CFS structures. As the main connection method, screw connections between CFS and gypsum sheathing play an important role in both the structural design and fire resistance of this wall system. However, studies on the mechanical behavior of screw connections with double-layer gypsum sheathing are still limited. In this study, 200 monotonic tests of screw connections with single-or double-layer gypsum sheathing at both ambient and elevated temperatures were conducted. The failure of screw connections with double-layer gypsum sheathing in shear was different from that of single-layer gypsum sheathing connections at ambient temperature, and it could be described as the breaking of the loaded sheathing edge combined with significant screw tilting and the loaded sheathing edge flexing fracture. However, the screw tilting and flexing fracture of the loaded sheathing edge gradually disappear at elevated temperatures. In addition, the influence of the loaded edge distance, double-layer sheathing and elevated temperatures is discussed in detail with clear conclusions. A unified design formula for the shear strength of screw connections with gypsum sheathing is proposed for ambient and elevated temperatures with adequate accuracy. A simplified load-displacement model with the post-peak branch is developed to evaluate the load-displacement response of screw connections with gypsum sheathing at ambient and elevated temperatures.

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Section: Shear Strength Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Chen

2016

Applied Sciences

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“…Ho and Tsai [9] proposed that the quality of boards had a great effect on the fire resistance of the wall. Nithyadharan and Kalyanaraman [10] researched on the strength of the connection of screw and calcium silicate board. Chuang et al [11] came up with the conclusion that the room temperature had a direct influence on the surface temperature when the specimen was tested for fire resistance.…”

Section: Introductionmentioning

confidence: 99%

The Standard Fire Testing and Numerical Modelling of the Behavior of Calcium Silicate Board Metallic‐Framework Drywall Assembly with Junction Box

Wang

Chuang

Lin

et al. 2018

Advances in Materials Science and Engineering

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e metallic-framework drywall is used as the specimens in this research. e standard fire test and finite element simulation were performed once on 300 cm × 300 cm area specimen and twice on 100 cm × 100 cm area specimens, to quantify and evaluate the effect of the junction boxes on the fireproof property after being embedded into the metallic-framework drywall. e results of the experiment show that the temperature of unexposed surface rises faster due to the higher thermal conductivity of the internal metal junction box. e general junction box whose material is PVC can be softened off when heated, affecting the integrity of the firewall and also leading to rapid transfer to the unexposed surface. e prediction of finite element simulation temperature is highly correlated with the results of the real experiment. It is effective to strengthen the original weaknesses by adding a calcium silicate board behind the junction box and using metal panels instead of PVC. e temperature of the temperature junction box surface which is the highest temperature point of unexposed surface decreased most significantly at 72.9°C after the reinforcement. In addition, after reinforcement, the fire resistance time can reach to 1 hour by inserting the junction box into the metallicframework drywall.

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Experimental Investigation of Sheathed Cold‐Formed Steel Sigma Studs Under Compression Loading

Yousefi,

Samali,

2023

ce papers

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Cold‐formed steel sections are used to form various components of low‐and medium‐rise buildings. Such sections are commonly constructed with sheathing board, providing thermal and acoustic separation between interior partitions. In contemporary projects, these sheathing boards have been used to provide bracing and increasing lateral stiffness. The strength and stiffness of sheathing‐braced structural assemblies is governed by connections between framing elements and sheathing components. This paper describes an experimental investigation of stability and strength of sheathed cold‐formed steel lipped sigma wall studs under compression loading. A total of 35 experimental tests conducted covering various parameters including, sheathing plasterboard thickness, stud and track thickness, plasterboard configuration and density. Sheathing density and thickness are found to be significant in impacting the compression strength of the sheathed cold‐formed steel lipped sigma studs. A clear pattern was noted between plasterboard material and thickness on the stability and strength of the sheathed stud. It is found that higher density boards provided the greatest restraint against buckling, as did increased thicknesses. Isolating direct loading of the sheathing, and Composite action between the stud and sheathing are shown to be significant in determining the strength and controlling limit state of the stud.

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Experimental study of screw connections in CFS-calcium silicate board wall panels

Cited by 56 publications

References 11 publications

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

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

The Standard Fire Testing and Numerical Modelling of the Behavior of Calcium Silicate Board Metallic‐Framework Drywall Assembly with Junction Box

Experimental Investigation of Sheathed Cold‐Formed Steel Sigma Studs Under Compression Loading

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