Flexural behaviour of back-to-back built-up cold-formed steel channel beams: Experiments and finite element modelling

Structures ◽  
2021 ◽  
Vol 29 ◽  
pp. 235-253
Author(s):  
Krishanu Roy ◽  
Hieng Ho Lau ◽  
Tina Chui Huon Ting ◽  
Boshan Chen ◽  
James B.P. Lim
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Flexural Behaviour ◽  
Element Modelling ◽  
Cold Formed Steel

scholarly journals Serviceability and flexural strength of lightweight floor made of cold formed steel joists.

2021 ◽  
Author(s):  
Quzzafi Rehman
Keyword(s):  
Finite Element ◽  
Flexural Strength ◽  
Ultimate Strength ◽  
Parametric Study ◽  
Finite Element Modelling ◽  
Dynamic Properties ◽  
Element Modelling ◽  
Floor Systems ◽  
Cold Formed Steel ◽  
Experimental Findings

The use of cold-formed steel (CFS) is becoming popular in residential and commercial building as a cost-effective alternative to traditional wood materials. CFS provides high strength-to-weight ratio, resulting in permitting lighter structure and longer spans. If proper design considerations are not made, this longer span and lighter structure can result in vibration serviceability issues that may affect building occupant comfort. The available design methods to calculate the dynamic properties of floor systems (i.e. Canadian Wood Council Method, CWC; Applied Design Council Design Method, ATC; and Eurocode, EC5) are used for the design of light-frame timber-based systems, CFS C-shape joists, and structural steel and concrete floor systems. The applicability of such methods to I-shape CFS joists is as yet unavailable. In addition, the North American Code for Cold-formed Steel structural Members (CSA-S136-07) provides specifications of ultimate and serviceability limit state design of C-shape joists rather than I-shape joists. As such, this research was divided into three parts. Part 1 presented the results of laboratory and field study on the vibration of a recently developed CFS I-shape joist called “iSPAN.” The main objective of the first part was to understand the dynamic characteristics of iSPAN floor system, recommend an adequate model for predicting the dynamic response and modal properties of floor systems, and correlate its results with engineered wood I-joists in order to aid the design process. Part 2 presented comparison between the experimental findings and available code provisions for the design of CFS joists at ultimate and serviceability limit states. The effect of web utility holes was also considered on the dynamic properties, and ultimate strength of iSPAN joists. Part 3 presented a finite-element modeling and its verification with the experimental findings of the tested samples. Also, part 3 extended the finite element modelling to analyse I- and C-shape CFS joists to determine their ultimate strength and serviceability, with and without the presence of utility holes in the webs. Since CSA-S137-07 does not provide design provisions for the edge-stiffened (i.e. lipped) holes, a practical-design-oriented parametric study, using the finite-element modelling, was conducted on CFS I- and C-shape members with circular, slotted and tri-slotted, edge-stiffened, holes under flexural loading. The optimized profile of the edge-stiffened holes was obtained using the elastic-buckling analysis. The post-buckling finite-element analysis was then utilized to determine member flexural strength as affected by utility hole geometry and web depth. Results showed that the edge-stiffened holes can significantly improve the flexural strength of CFS joists. The data generated from the parametric study was used to develop new design provisions to predict the flexural strength of such joists with the presence of edge-stiffened holes.

scholarly journals Serviceability and flexural strength of lightweight floor made of cold formed steel joists.

2021 ◽  
Author(s):  
Quzzafi Rehman
Keyword(s):  
Finite Element ◽  
Flexural Strength ◽  
Ultimate Strength ◽  
Parametric Study ◽  
Finite Element Modelling ◽  
Dynamic Properties ◽  
Element Modelling ◽  
Floor Systems ◽  
Cold Formed Steel ◽  
Experimental Findings

The use of cold-formed steel (CFS) is becoming popular in residential and commercial building as a cost-effective alternative to traditional wood materials. CFS provides high strength-to-weight ratio, resulting in permitting lighter structure and longer spans. If proper design considerations are not made, this longer span and lighter structure can result in vibration serviceability issues that may affect building occupant comfort. The available design methods to calculate the dynamic properties of floor systems (i.e. Canadian Wood Council Method, CWC; Applied Design Council Design Method, ATC; and Eurocode, EC5) are used for the design of light-frame timber-based systems, CFS C-shape joists, and structural steel and concrete floor systems. The applicability of such methods to I-shape CFS joists is as yet unavailable. In addition, the North American Code for Cold-formed Steel structural Members (CSA-S136-07) provides specifications of ultimate and serviceability limit state design of C-shape joists rather than I-shape joists. As such, this research was divided into three parts. Part 1 presented the results of laboratory and field study on the vibration of a recently developed CFS I-shape joist called “iSPAN.” The main objective of the first part was to understand the dynamic characteristics of iSPAN floor system, recommend an adequate model for predicting the dynamic response and modal properties of floor systems, and correlate its results with engineered wood I-joists in order to aid the design process. Part 2 presented comparison between the experimental findings and available code provisions for the design of CFS joists at ultimate and serviceability limit states. The effect of web utility holes was also considered on the dynamic properties, and ultimate strength of iSPAN joists. Part 3 presented a finite-element modeling and its verification with the experimental findings of the tested samples. Also, part 3 extended the finite element modelling to analyse I- and C-shape CFS joists to determine their ultimate strength and serviceability, with and without the presence of utility holes in the webs. Since CSA-S137-07 does not provide design provisions for the edge-stiffened (i.e. lipped) holes, a practical-design-oriented parametric study, using the finite-element modelling, was conducted on CFS I- and C-shape members with circular, slotted and tri-slotted, edge-stiffened, holes under flexural loading. The optimized profile of the edge-stiffened holes was obtained using the elastic-buckling analysis. The post-buckling finite-element analysis was then utilized to determine member flexural strength as affected by utility hole geometry and web depth. Results showed that the edge-stiffened holes can significantly improve the flexural strength of CFS joists. The data generated from the parametric study was used to develop new design provisions to predict the flexural strength of such joists with the presence of edge-stiffened holes.

Finite element modelling of flexural behaviour of geosynthetic cementitious composite mat (GCCM)

2018 ◽  
Vol 154 ◽  
pp. 33-42 ◽  
Author(s):  
Tidarut Jirawattanasomkul ◽  
Nuttapong Kongwang ◽  
Pitcha Jongvivatsakul ◽  
Suched Likitlersuang
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Cementitious Composite ◽  
Flexural Behaviour ◽  
Element Modelling

Experiments and finite element modelling of screw pattern of self-drilling screw connections for high strength cold-formed steel

2019 ◽  
Vol 145 ◽  
pp. 106393 ◽  
Author(s):  
Krishanu Roy ◽  
Hieng Ho Lau ◽  
Tina Chui Huon Ting ◽  
Rehan Masood ◽  
Ankur Kumar ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
High Strength ◽  
Element Modelling ◽  
Cold Formed Steel

Finite Element Modelling of Innovative Precast Cold-Formed Steel Ferrocement as Composite Beam

2015 ◽  
Vol 752-753 ◽  
pp. 539-543 ◽  
Author(s):  
Anis Saggaff ◽  
Talal Alhajri ◽  
M. Ismail ◽  
Khaled Alenezi ◽  
Mohamad Ragae
Keyword(s):  
Finite Element ◽  
Composite Beam ◽  
Finite Element Modelling ◽  
Close Agreement ◽  
Concrete Slab ◽  
Experimental Tests ◽  
Composite Beams ◽  
Element Modelling ◽  
Cold Formed Steel ◽  
Steel Section

This paper describes Finite Element Modeling (FEM) of a composite beam comprised of cold formed steel section and concrete slab designed as ferrocement. Software (ANSYS, version 11) was adopted to carry out the modeling of the proposed composite beam. Experimental tests were also been carried out for three simple supported composite beams. The proposed innovative precast composite beam specimens of cold-formed steel lipped channel sections (CFS) connected with ferrocement slab were tested till failure, under two point loads positioned atquarter length of the span from support. The results showed that close agreement was observed between the FEM and experimental results for ultimate loads and load-deflection responses.

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