Buckling Capacity of Socket-Template Scaffold System without X-Bracing

Zhao, Zhongwei; Liu, Haiqing; Dong, Jinfeng; Bian, Yuxian

doi:10.1061/(asce)cf.1943-5509.0001373

Cited by 10 publications

(4 citation statements)

References 16 publications

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“…Moreover, since scaffolds structures are flexible as prefabricated and assembled tailored to the working geometries and conditions, the components are reusable from one job to another. Thus, the components sometimes possessed imperfection(s) and might jeopardise the structural integrity [4,5,[7][8][9][10][11].…”

Section: Fig 1 -Basic Parts Of Scaffold [5]mentioning

confidence: 99%

Evaluation of All-Round Modular Scaffolding (ARMS) type Scaffold by using BS1139 Standards for Industries

Yob

Tahir

Latif

et al. 2021

JAMEA

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Scaffolds can be categorised into access scaffolds and support scaffolds based on its functions: access scaffolds and support scaffolds. Regardless, both are only consent to be used when it follows requirement set forth by the government in order to protect the workers’ safety and health. Due to increased demand for scaffolds manufacturers try to compete with each other by developing various type and sizes of scaffolds. Unfortunately, the usage of these modern scaffolds such as All-Round Modular Scaffoldings are rather limited due to its deviations from the BS 1139 standards. This study aims to determine the distribution force on the All-Round Modular Scaffolding determine its suitable duty category based on the BS1139 guidelines. Standard parts of ARMS from manufacturer was used to build one storey x 1 bay (sizing 3 m x 3 m) structure and was assembled by authorised and professional contractor. The structure was then put through load test. The load was placed on top of the working platform and the deflection of the components was measured. The findings reveal that the structure as well as the individual platform can support loads up to 500 kg with no crack or permanent deformation observed after the test. By referring the BS1139 standards, the All-Round Modular Scaffolding is surpassing the requirement for general and heavy-duty scaffold with distributed load on platform recorded to be 2.67 kN/m2 and concluded that the additional length of the components does not compromise the working purpose of the scaffolds.

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Section: Fig 1 -Basic Parts Of Scaffold [5]mentioning

confidence: 99%

Evaluation of All-Round Modular Scaffolding (ARMS) type Scaffold by using BS1139 Standards for Industries

Yob

Tahir

Latif

et al. 2021

JAMEA

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“…The mechanical behavior of the connection joints of formwork supports is complex because of the need for a rapid assembly during construction. The semi-rigid joints significantly influence the bearing capacity of the overall formwork support system [7][8][9][10]. There are many studies on semi-rigid joints of steel frames [11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Buckling Behavior of a Wheel Coupler High-Formwork Support System Based on Semi-Rigid Connection Joints

2022

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To clarify the buckling behavior of a wheel coupler high-formwork support system with a diagonal bracing, the positive and negative bending behaviors of the connection joints of the support were systematically studied through experiments. Through a parametric analysis and a finite element analysis, a precise numerical model of the connection joints of the wheel coupler was established and verified. Based on the characteristics of the semi-rigid connections, the buckling behavior of the overall structure was analyzed. The results showed that the failure modes in the positive direction were correlated with the insertion depth of the socket into the template; the greater the depth, the more likely the socket was to fracture. The failure modes in the negative direction were closely related to the insertion depth and the bending of the vertical post. An appropriate joint density was conducive to the overall stability. In the presence of a lateral constraint at the top, the greater the angle between the diagonal bracing and the horizontal plane, the better the overall stability under the same joint density. The optimal layout of the vertical diagonal bracing was a 2-span, 4-step arrangement, and the optimal angle was in the range of 30–70°. In the absence of a lateral constraint at the top, the smaller the angle between the diagonal bracing and the horizontal plane, the better the overall stability under the same joint density. The optimal angle was approximately 30° when the lift height was moderate.

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“…The method for the stability calculation of formwork support has been given in the "Technical specification for safety of disk lock steel tubular scaffold in construction" [1] and "Standard" [2], but this calculation method is questioned by scholars [3][4][5]. Research shows that the connection joints in the disc-buckle type formwork support system have semi-rigid connection characteristics and the moment-rotation curve of the joints is nonlinear [6][7][8]. Several studies have focused on the effective length correction factor of fastener-styles and other formwork supports [9][10][11]; the fixed value of the initial joint bending stiffness was used when considering the semi-rigid joints.…”

Section: Introductionmentioning

confidence: 99%

Effective length correction factor of disc-buckle type scaffolding by considering joint bending stiffness and geometrical size

Dong

Liu²,

Lei³

et al. 2022

PLoS ONE

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Based on the theory of sway frame column, the equation of the effective length factor was derived in this paper. Combined with the characteristics of semi-rigid joints, the linear stiffness correction factor of horizontal bar was introduced, and the equation of effective length correction factor was obtained. By using MATLAB programming method, the three-dimensional relationship between the effective length correction factor and the influencing factors was obtained, and the entire process of the stability bearing capacity of the disc-buckle type high support system was described in detail, which improves the stability calculation theory of the high support system. The influence of setting parameters, joint bending stiffness, geometrical size, and material properties on the effective length correction factor is studied. Simultaneously, the joint bending stiffness of semi-rigid joints is determined. The area of the effective length correction factor is analyzed to optimize the design of the setting scheme using horizontal bars and vertical poles of different sizes. The results show that the lift height significantly affects the effective length correction factor during the load bearing process; the factor decreases with increasing lift height. Large transverse and longitudinal distances influence this rule during the initial load bearing. When the joint bending stiffness is less than 100 (kN·m)/rad, the effective length correction factor decreases rapidly with an increase in joint bending stiffness. When the joint bending stiffness is greater than 100 (kN·m)/rad, the effective length correction factor is unaffected by the joint bending stiffness. When the joint bending stiffness is large at initiation of loading, the effective length correction factor decreases with an increase in the outer diameter of the horizontal bar. When the joint bending stiffness is small, the effective length correction factor increases with an increase in the section size of the vertical pole. Therefore, the outer diameter of the horizontal bar significantly affects the effective length correction factor, and a larger diameter is more conducive to the overall stability. Furthermore, the elastic modulus effects the effective length correction factor for the unstable support system.

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Buckling Capacity of Socket-Template Scaffold System without X-Bracing

Cited by 10 publications

References 16 publications

Evaluation of All-Round Modular Scaffolding (ARMS) type Scaffold by using BS1139 Standards for Industries

Evaluation of All-Round Modular Scaffolding (ARMS) type Scaffold by using BS1139 Standards for Industries

Buckling Behavior of a Wheel Coupler High-Formwork Support System Based on Semi-Rigid Connection Joints

Effective length correction factor of disc-buckle type scaffolding by considering joint bending stiffness and geometrical size

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