Experimental Evaluation of Tie Bar Effects on Structural Behavior of Suspended Scaffolding Systems

Sevim, Barış; Bekiroğlu, Serkan; Arslan, Güray

doi:10.18057/ijasc.2017.13.1.4

Cited by 4 publications

(4 citation statements)

References 20 publications

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“…The choice of this equipment must consider the weather conditions (namely the action of the wind) and the characteristics of the roof. By comparison with the supported scaffolds, the assembly and disassembly times are shorter, it has a good carrying capacity for people and materials, and it allows access to façades with restrictions at the soil level [19], but it has limitations in complex features and protrusions from the façade [2].…”

Section: Suspended Scaffoldsmentioning

confidence: 99%

The Impact of Temporary Means of Access on Buildings Envelope’s Maintenance Costs

et al. 2021

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Accessibility to buildings’ envelope depends on efficient inspection and other maintenance actions of their components. When access to these components is not planned, special means of access are required to carry out the maintenance work. Means of access, besides having a fundamental role on the quality of maintenance works of building envelope components, also represents a considerable part of the maintenance costs. Thus, to optimize costs and resources in maintenance plans, assessment of the impact of the means of access on maintenance costs is crucial. For works in height, there are several alternative means of access. The choice of the most adequate solution is strongly linked to the characteristics (e.g., architecture, height) and constraints (e.g., users, surrounding space) of each building, the maintenance needs of the envelope, and the time and funds available for the intervention. Therefore, in this study, a sensitivity analysis to understand how the cost of means of access can influence the maintenance costs is carried out. Moreover, the optimisation of maintenance activities in façade claddings is also analysed. This study intends to assess whether it is advantageous to consider permanent means of access during the design phase or opt for temporary means of access. In a first stage, the impact of six temporary means of access (supported and suspended scaffolds; articulated booms; telescopic booms; scissor lifts; and rope access) on the maintenance plans developed for the six types of claddings (ceramic tiling systems—CTS, natural stone claddings—NSC, rendered façades—RF, painted surfaces—PS, external thermal insulation composite systems—ETICS, and architectural concrete façades—ACF) is examined. The impact is estimated through a stochastic maintenance model based on Petri nets. After that, a sensitivity analysis and a multi-criteria decision analysis are performed. Based on the results, general recommendations are presented concerning the maintenance strategies to adopt in the cladding solutions analysed. The results reveal that planning the means of access during the design stage can be economically beneficial for all buildings’ envelope components.

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Section: Suspended Scaffoldsmentioning

confidence: 99%

The Impact of Temporary Means of Access on Buildings Envelope’s Maintenance Costs

et al. 2021

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“…Yu et al [26] and Chu et al [27] integrated the lowest eigenmode with a column out-of-straightness magnitude of 1/1000 for the height of the scaffold units into the model. Sevim et al [28] investigated the effects of truss height and number of tie bars on the structural behavior of suspended scaffolding systems through experiments, the results showed that a scaffolding system with 60 cm-high truss and two tie bars presents optimal safety and cost-savings. Liu et al [29] presented a mortise-tenon steel-tube scaffold, the influencing laws of storey height, vertical member interval and other factors were determined through parameter analysis, research results provide important references for future in-depth studies and engineering applications of the mortise-tenon steel-tube scaffold.…”

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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“…Among other configurations of scaffolding, Sevim et al investigated the structural behavior of tie-bar numbers on the suspended scaffolding systems in the laboratory. In this study, they tested fifteen suspended scaffolding systems and obtained the load-displacement curves; particularly, the optimal suspended scaffolding system in terms of safety and cost was determined [9].…”

Section: Introductionmentioning

confidence: 99%

Stability Study on Scaffolds With Inclined Surfaces and Extended Jack Bases in Construction

Peng

Wang

et al. 2021

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A scaffolding system is a temporary structure that is commonly adopted on construction sites. As steel scaffolds are modular members manufactured with fixed dimensions, the total height of a scaffolding system seldom fits the headroom of a building when scaffolds are set up in multiple stories. This results in a difference in elevation, i.e. gap, between the top of the scaffolding system and the ceiling slab. In addition, scaffold configurations may need to be adjusted if the interior of a building has inclined planes on the ceiling slab or stairs on the ground. This study shows that the gap between the scaffold and the ceiling slab can be eliminated by altering the lengths of adjustable base jacks or adjustable U-head jacks. When the ceiling slab is inclined, it is suggested that a combined system of scaffolds with wooden shores of different lengths should be installed in the out-of-plane direction of the scaffold unit. This system can also be used when the ceiling slab is inclined and the ground has a difference in elevation (e.g., stairs) in a building. By using the second -order elastic analysis with semirigid joints, the load-bearing capacity and failure model are found to be very close to those obtained in the loading tests using various scaffold configurations. In the loading tests for reused scaffolds, the lower bound of the load -bearing capacity of the scaffolding systems can be obtained by applying a subsequent load on the scaffolding systems, which are commonly adopted on the construction sites. The strength reduction factor () of these scaffolding systems installed by reused scaffolds can be obtained by calculating the mean value and standard deviation, which can serve as a reference for the strength design of scaffolding systems with different safety requirements.

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Experimental Evaluation of Tie Bar Effects on Structural Behavior of Suspended Scaffolding Systems

Cited by 4 publications

References 20 publications

The Impact of Temporary Means of Access on Buildings Envelope’s Maintenance Costs

The Impact of Temporary Means of Access on Buildings Envelope’s Maintenance Costs

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

Stability Study on Scaffolds With Inclined Surfaces and Extended Jack Bases in Construction

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