Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Steel and Composite Structures Volume 46, Number 4, February25 2023 , pages 497-512 DOI: https://doi.org/10.12989/scs.2023.46.4.497 |
|
|
|
Seismic performance of CFS shear wall systems filled with polystyrene lightweight concrete: Experimental investigation and design methodology |
||
Mohammad Rezaeian Pakizeh, Hossein Parastesh, Iman Hajirasouliha and Farhang Farahbod
|
||
| Abstract | ||
| Using light weight concrete as infill material in conventional cold-formed steel (CFS) shear wall systems can considerably increase their load bearing capacity, ductility, integrity and fire resistance. The compressive strength of the filler concrete is a key factor affecting the structural behaviour of the composite wall systems, and therefore, achieving maximum compressive strength in lightweight concrete while maintaining its lightweight properties is of significant importance. In this study a new type of optimum polystyrene lightweight concrete (OPLC) with high compressive strength is developed for infill material in composite CFS shear wall systems. To study the seismic behaviour of the OPLC-filled CFS shear wall systems, two full scale wall specimens are tested under cyclic loading condition. The effects of OPLC on load-bearing capacity, failure mode, ductility, energy dissipation capacity, and stiffness degradation of the walls are investigated. It is shown that the use of OPLC as infill in CFS shear walls can considerably improve their seismic performance by: (i) preventing the premature buckling of the stud members, and (ii) changing the dominant failure mode from brittle to ductile thanks to the bond-slip behaviour between OPLC and CFS studs. It is also shown that the design equations proposed by EC8 and ACI 318-14 standards overestimate the shear force capacity of OPLC-filled CFS shear wall systems by up to 80%. This shows it is necessary to propose methods with higher efficiency to predict the capacity of these systems for practical applications. | ||
| Key Words | ||
| cold formed steel frame; composite wall system; cyclic behaviour; Optimum Polystyrene Lightweight Concrete (OPLC); seismic performance | ||
| Address | ||
| Mohammad Rezaeian Pakizeh, Hossein Parastesh:Department of Civil Engineering, University of Science and Culture, Tehran, Iran Iman Hajirasouliha:Department of Civil and Structural Engineering, The University of Sheffield, Sheffield, UK Farhang Farahbod:Building and Housing Research Center (BHRC), Tehran, Iran | ||