Experimental study on shear behavior of screw connections in CFS sheathing

Ye, Jihong; Wang, Xingxing; Zhao, Meng

doi:10.1016/j.jcsr.2015.12.027

Cited by 55 publications

(26 citation statements)

References 11 publications

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“…∆ 1T is the predicted displacement corresponding to F mT for the screw connection with single-layer gypsum sheathing at T • C. Figure 16 gives the values of the predicted ∆ 1T based on the present experiments. α 1 is the coefficient that considers the effect of double-layer gypsum sheathing on ∆ mT , as shown in Equations (8) and (9). As shown in Table 2, the test results of ∆ mT for the connection series with double-layer gypsum sheathing and a loaded edge distance of 20 mm were much lower than those of the series with double-layer gypsum sheathing and a loaded edge distance of 15 or 10 mm for temperatures beyond 250 • C. This phenomenon seems unusual, and it was not considered in Equation (9).…”

Section: Other Parametersmentioning

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: Other Parametersmentioning

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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“…In order to verify the proposed hysteretic model, comparative analysis on the experimental results of the CFS shear walls described by Xu [22] was carried out, where the end stud sections of specimens include square-89 × 100 × 0.9 and square-140 × 140 × 1.5 (hereinafter referred to as 89-type and 140-type walls, respectively); all specimens were sheathed with gypsum wallboards combined with bolivian magnesium boards on both sides, whose shear modulus are 484 and 124 N/mm 2 , respectively; the shear performance of screw connections was determined according to the test results of Ye et al [27], as detailed listed in Table 2. Firstly, the elastic lateral stiffness K e and shear capacity F p of each specimen was determined according to the simplified method that was described in Section 3.1.3; on this basis, the discrete coordinate method was used to establish the load-displacement skeleton curves of those specimens.…”

Section: Model Verificationmentioning

confidence: 99%

Piecewise Function Hysteretic Model for Cold-Formed Steel Shear Walls with Reinforced End Studs

Wang

2017

Applied Sciences

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Cold-formed steel (CFS) shear walls with concrete-filled rectangular steel tube (CFRST) columns as end studs can upgrade the performance of mid-rise CFS structures, such as the vertical bearing capacity, anti-overturning ability, shear strength, and fire resistance properties, thereby enhancing the safety of structures. A theoretical hysteretic model is established according to a previous experimental study. This model is described in a simple mathematical form and takes nonlinearity, pinching, strength, and stiffness deterioration into consideration. It was established in two steps: (1) a discrete coordinate method was proposed to determine the load-displacement skeleton curve of the wall, by which governing deformations and their corresponding loads of the hysteretic loops under different loading cases can be obtained; afterwards; (2) a piecewise function was adopted to capture the hysteretic loop relative to each governing deformation, the hysteretic model of the wall was further established, and additional criteria for the dominant parameters of the model were stated. Finally, the hysteretic model was validated by experimental results from other studies. The results show that elastic lateral stiffness K e and shear capacity F p are key factors determining the load-displacement skeleton curve of the wall; hysteretic characteristics of the wall with reinforced end studs can be fully reflected by piecewise function hysteretic model, moreover, the model has intuitional expressions with clear physical interpretations for each parameter, paving the way for predicting the nonlinear dynamic responses of mid-rise CFS structures.

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Fastener behaviour in sheathed light‐gauge steel stud walls under cyclic and monotonic actions

2021

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Steel framed buildings using digitally fabricated light‐gauge steel sections, combined with an offsite panelised fabrication approach, are becoming more widespread and contribute towards reducing cost and erection time without requiring a large workforce to assemble them. Currently, design standards mandate the use of K‐ or X‐bracing in these structures, thus neglecting the beneficial influence of the sheathing on the behaviour of the system, in particular its resistance to lateral loads. This composite behaviour is largely influenced by the performance of the fasteners, which may exhibit tilting, shear failure and fastener pull‐out. This paper takes a first step towards accounting for composite action between light‐gauge steel stud framing and calcium silicate board by focusing on the behaviour of the screws connecting both. Key failure modes are identified, based on direct pull‐out tests and monotonic and cyclic connector shear tests. Significant pinching behaviour was observed under cyclic excitations.

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Experimental study on shear behavior of screw connections in CFS sheathing

Cited by 55 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

Piecewise Function Hysteretic Model for Cold-Formed Steel Shear Walls with Reinforced End Studs

Fastener behaviour in sheathed light‐gauge steel stud walls under cyclic and monotonic actions

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