Shear Capacity of Cold-Formed Steel Channels with Edge-Stiffened Web Holes, Unstiffened Web Holes, and Plain Webs

The design of light-gage steel corrugated shear diaphragms is not yet covered by the structural codes of many countries, including Canada. The shear capacity of steel diaphragms may be predicted by various approaches currently available, namely, those proposed by: (1) the American Iron and Steel Institute; (2) the Manual of seismic design of buildings, published by the U.S. Departments of the Army, Navy, and Air Force; and (3) the recommendations outlined in the current British code. In this paper, a rational method is proposed and the application of all the above methods is illustrated with reference to a specific example. Finally, the shear strengths of many diaphragms are predicted by the new approach developed by the authors and the results are compared to test data.

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

Journal of Structural Fire Engineering ◽

10.1108/jsfe-07-2020-0024 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Kun Liu ◽

Wei Chen ◽

Jihong Ye ◽

Jian Jiang ◽

Wenwen Chen ◽

...

Keyword(s):

Shear Strength ◽

Elevated Temperatures ◽

Input Parameter ◽

Single Layer ◽

Shear Capacity ◽

Base Layer ◽

Residual Shear Strength ◽

Content Type ◽

Cold Formed Steel ◽

Fire Conditions

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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Push-out Test of Profiled Metal Decking Slabs with Cold-formed Steel Beams and Rebar Shear Connector

Walailak Journal of Science and Technology (WJST) ◽

10.48048/wjst.2021.19825 ◽

2021 ◽

Vol 18 (12) ◽

Author(s):

Achmad Abraham S. ARMO ◽

Anis SAGGAFF ◽

Mahmood Bin Md. TAHIR

Keyword(s):

Composite Beam ◽

Failure Modes ◽

Shear Capacity ◽

Shear Connector ◽

Test Results ◽

Modes Of Failure ◽

Beam Design ◽

Two Samples ◽

Cold Formed Steel ◽

Push Out

New methods to provide shear strength on the cold-formed steel (CFS) lipped c-channel section composite beam encased with concrete partially is proposed using rebars embedded in concrete. The development of research on the CFS composite beams technology with partial encasement shows that the section of the composite beam encased with concrete partially can provide ductile flexural action for the composite beam. The application of profiled metal decking slabs in the composite beam is becoming increasingly popular compared to solid slabs. However, it has a detrimental effect on the structural behavior of a composite beam. This research is aimed primarily at presenting the behavior of the rebar shear connector to evaluated ductility, shear capacity, and modes of failure. Two samples using a rebar 12 mm in diameter in the profiled metal decking slabs and solid slabs were tested using the standard push-out test till failure. For the composite beam design, the proposed shear connector embedded in the slab concrete and the CFS encased with concrete partially used the test results’ shear capacity, greater than the values as proposed by section 3.1, BS 5950. Due to rebars shear-off, the solid slab specimen failed with the highest load of 489.6 kN while the Profiled Metal Decking Slab specimen failed due to the formation of the cracks on the PMDS at 421.1 KN ultimate loading. HIGHLIGHTS A new system of the rebar shear connectors for the Cold-Formed Steel (CFS) composite beam partially encased in concrete have been developed The main purpose of push-out testing is to investigate the shear capacity and ductility of the proposed shear connector failure modes and load-slip connections The shear capacity of the test results is greater than the values as indicated by BS 5950 Part 3.1 The proposed rebars as a shear connector for partly embedded CFS can be used in the construction GRAPHICAL ABSTRACT

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Push-out Tests of Innovative Shear Connectors Between Cold-formed Steel Section Integrated with Ferrocement Jacket

Jurnal Teknologi ◽

10.11113/jt.v74.4611 ◽

2015 ◽

Vol 74 (4) ◽

Author(s):

K. Alenezi ◽

M. M. Tahir ◽

T. Alhajri ◽

M. R. K. Badr ◽

J. Mirza ◽

...

Keyword(s):

Reinforced Concrete ◽

Load Capacity ◽

Construction Materials ◽

Shear Capacity ◽

Strength Performance ◽

Composite Column ◽

Shear Connectors ◽

Cold Formed Steel ◽

Push Out ◽

Steel Section

Traditional construction materials such as steel and concrete exhibit signs of deterioration over the years. This can be attributed either to the inherent nature of the materials or their weak resistance to adverse the environmental conditions and natural disasters, such as, fires, earth quakes, etc. The use of ferrocement as an external jacket to cold-formed column is presented in this study to provide an alternative solution to existing construction materials. Ferrocement is a special form of reinforced concrete, which exhibits a behavior that differs much from conventional reinforced concrete in strength performance and other potential applications. The use of ferrocement with cold-formed steel as composite column is a new approach to enhance the axial load capacity of the later. Hence, the composite action between ferrocement and cold-formed steel section have to be established by means of understanding the behavior of the proposed shear connectors. In this study, push-out test set-up is proposed for eight specimens with various shear connectors’ configuration. The utilization of high strength self-compacting ferrocement mortar in the design of cold-formed steel integrated with ferrocement jacket as composite column is proposed. It was observed that ferrocement jacket with 12 mm bolt shear connectors showed the best shear capacity when compared to other proposed shear connectors.

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FINITE ELEMENT ANALYSIS OF HYBRID COLD-FORMED STEEL SHEAR WALL PANELS

Proceedings of International Structural Engineering and Construction ◽

10.14455/isec.res.2018.148 ◽

2018 ◽

Vol 5 (2) ◽

Cited By ~ 1

Author(s):

Nima Usefi ◽

Hamid Ronagh ◽

Masoud Mohammadi

Keyword(s):

Weight Ratio ◽

Shear Wall ◽

Shear Capacity ◽

Seismic Capacity ◽

Element Analysis ◽

Economic Application ◽

Steel Shear Wall ◽

Wall Panels ◽

Cold Formed Steel ◽

Wall System

Improving the lateral performance of cold formed steel systems by employing different sheathing materials and bracing systems has been of particular interest to researchers in these days. However, due to their relatively low seismic capacity, the need for higher shear resistance of these structural systems is still felt. Therefore, this study aims to propose three hybrid shear wall panels in order to provide better performance and higher resistance in seismic zones. The numerical method is verified based on the experimental results in the literature and then is used for evaluating the hybrid systems. The proposed walls are analyzed under lateral and vertical loads and then their performances are compared to each other. The results showed better performance and higher shear capacity for hybrid wall system compared to the ordinary cold formed steel shear wall. In addition, the strength to weight ratio approved the economic application of hybrid panels for high seismic regions.

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Effect of openings on cold formed steel shear wall panels

Journal of the Croatian Association of Civil Engineers ◽

10.14256/jce.2755.2019 ◽

2020 ◽

Vol 72 (09) ◽

pp. 771-780

Keyword(s):

Good Accuracy ◽

Shear Wall ◽

Shear Capacity ◽

Nonlinear Behaviour ◽

Lateral Shear ◽

Benchmark Model ◽

Steel Shear Wall ◽

Wall Panels ◽

Cold Formed Steel ◽

Abaqus Software

In this paper, the effect of openings on global performance of Cold Formed Steel Shear Wall Panels is investigated numerically using the ABAQUS software. A benchmark model is first validated in terms of lateral shear capacity and nonlinear behaviour of the CFS-SWP. The failure mode of the CFS-SWP with opening is identified and validated. Subsequently, a parametric study on the effect of size and position of openings is conducted, in which the opening position is found to have a significant impact on the CFS-SWP performance. The benchmark model can be used for design purposes to evaluate with good accuracy the reduced ultimate strength of individual CFS-SWPs for any size and position of openings.

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