Seismic performance of high-strength lightweight foamed concrete-filled cold-formed steel shear walls

Xu, Zhifeng; Chen, Zhongfan; Osman, Bashir H.; Yang, Suhang

doi:10.1016/j.jcsr.2017.12.027

Cited by 46 publications

(14 citation statements)

References 17 publications

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“…Cement-based lightweight materials, such as foamed concretes and cement mortars, which are made of foam, water and cement with or without fine sand, have advantages of adjustable density and strength [ 1 ], outstanding performance [ 2 , 3 ] and convenience for construction in-place [ 4 ]. Therefore, they have been increasingly used in engineering applications, such as embankments [ 5 ], bridge approaches [ 6 ], precast walls [ 7 ], aircraft arresting system [ 8 ], and insulation floor/roof screeds [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Performance and Void Structure Change of Foamed Cement Paste Subjected to Static and Cyclic Loading under Plane Strain Conditions

2022

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Cement-based lightweight materials have received much attention recently in embankment backfill applications, the boundary of which is more close to a plane strain condition. To study the influence of plane strain condition on the behavior and void structure of cement-based lightweight material under cyclic loading, this paper conducted a series of compression tests on foamed cement pastes with densities of 700 and 900 kg/m3 subjected to static and cyclic loading under plane strain conditions. The X-CT technique was adopted to obtain the three-dimensional (3-D) void structures of the specimens before and after the loading tests. The results showed that the plane strain conditions yielded specimen compression strengths 30–50% higher than the unconfined conditions. The specimen integrity endured under load levels of less than 0.5, but failed after approximately 1000 cycles under a load level of 0.8, indicating that cyclic loading could accelerate the degradation of the specimena. The void structures of the specimens showed that the void volumes were featured bfatured an unimodal distribution with unimodal positions in a range of 0.1–0.2 mm3. The unimodal position became higher with the increasing cyclic load level. Slices of the specimens after static and cyclic loading tests suggested that cyclic load could easily lead to the rupture of voids that then merge into bigger voids and the connection of voids forming cracks.

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Section: Introductionmentioning

confidence: 99%

Mechanical Performance and Void Structure Change of Foamed Cement Paste Subjected to Static and Cyclic Loading under Plane Strain Conditions

2022

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“…On the other hand, it results in reducing the sizes of structural elements, which consequently reduces the overall construction cost. It is found that LFC-filled cold-formed steel (CFS) wall has a great effect on seismic performance and failure mode of the CFS walls, since the usage of LFC in filling such walls improves the lateral capacity about three times compared with CFS walls without LFC (Xu et al. , 2018).…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of lateral response of lightweight foamed concrete-filled cold-formed steel walls

Alabbadi

Allouzi

2022

IJSI

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PurposeThe purpose of this study is to improve the lateral capacity of Cold-Formed Steel (CFS) frame walls filled with lightweight foamed concrete (LFC) and supported with straw boards by introducing structural foamed concrete and/or bracing.Design/methodology/approachFinite element models are developed and calibrated based on previous experimental work. Then, these models are extended to conduct a parametric study to quantify the effect of filling CFS walls and structural LFC and the effect of supporting CFS walls with bracing.FindingsResults of the study conclude that the finite element analysis can be used to simulate and analyze the lateral capacity of CFS walls effectively since the maximum deviation between calibrated and experimental results is 10%. The structural LFC usage in CFS walls improves the lateral capacity considerably by (25–75) % depending on the wall properties. Besides, the application of lateral bracing does not always have a positive effect on the lateral performance of these walls.Originality/valueAlthough CFS walls are preferred due to it is light in weight, low in cost, easy to install and recyclable, low seismic performance, buckling vulnerability, poor thermal insulation and sound insulation properties, low lateral stiffness, and low shear strength limit their use. This study proposes the use of structural foamed concrete and a different bracing method than what is available in the literature. This can overcome the drawbacks of the CFS walls alone which can permit the usage of such walls in mid-rise buildings and other applications.

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“…On the other hand, the experimental tests demonstrated that the failure of gypsum-encased wall studs occur when the bearing capacity was lost in the limit state of strength and hence not due to buckling. Additionally, Xu et al [12] proposed an innovative way to enhance the seismic performance of cold-formed steel (CFS) shear walls by filling the panel with high-strength lightweight foamed concrete and cover it with straw boards from both sides, where the shear strength and stiffness were increased.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of ultra‐lightweight concrete encased cold‐formed steel structures

Eid¹,

Joó²

2021

ce papers

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The use of thin‐walled structures has been increasingly spread in the last few decades due to their big advantages in both structural design and construction methods. Therefore, the recent researches have discussed a wide range of thin‐walled structures applications. However, the resistance of such structures will be decreased by buckling effect; hence, different ways of strengthening methods have been investigated. One of this method is the use of lightweight concrete as a filling of thin‐walled members. Previous experimental research at the Department of Structural Engineering at Budapest University of Technology and Economics, was carried out to investigate the axial behavior of polystyrene aggregate concrete (PAC) braced CFS elements [1]. The effect of PAC has led to increase the load‐bearing capacity and to restrain the global and distortional buckling modes of steel elements. The results revealed that the ultimate load was increased by 37‐94%. A simplified nonlinear finite element model was developed in ANSYS software to be able to predict the peak resistance of PAC filled thin‐walled members. GMNI analyses were carried out to validate the numerical model by the experimental tests. The concrete was modelled by using springs with adequate stiffness, where a parametric study was conducted to determine the proper imperfection amplitudes of different element lengths. The numerical model showed good agreement with test results.

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Seismic performance of high-strength lightweight foamed concrete-filled cold-formed steel shear walls

Cited by 46 publications

References 17 publications

Mechanical Performance and Void Structure Change of Foamed Cement Paste Subjected to Static and Cyclic Loading under Plane Strain Conditions

Mechanical Performance and Void Structure Change of Foamed Cement Paste Subjected to Static and Cyclic Loading under Plane Strain Conditions

Finite element analysis of lateral response of lightweight foamed concrete-filled cold-formed steel walls

Numerical simulation of ultra‐lightweight concrete encased cold‐formed steel structures

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