Mechanical properties of right-angle couplers in steel tube–coupler scaffolds

Li, Jia; Liu, Hongbo; Chen, Zhihua; Liu, Qun; Wen, Suolin

doi:10.1016/j.jcsr.2016.06.005

Cited by 20 publications

(10 citation statements)

References 23 publications

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“…Relative sliding in the vertical direction between the U-socket and C-clutch may, however, occur during the vibration when the vertical force acting on the joint is larger than the friction between the internal surface of C-clutch and outer surface of U-socket. This is different from the mechanical properties of the steel tubecoupler joint that only have rotational sliding occurs (Abdel-Jaber et al, 2020;Jia et al, 2016;Liu et al, 2018b). The relative vertical sliding range between component C and U is indicated as a, as shown in Figure 1(b).…”

Section: The Jointmentioning

confidence: 86%

“…The joints of TDS have many types, mainly including Wedge-pin Joint (WPJ) and Tube-coupler Joint (TCJ) (Abdel-Jaber et al, 2020; Jia et al, 2016; Liu et al, 2018b), which semi-rigid property usually stems from the clearance among components (Azizinamini and Radziminski, 1989; Liu et al, 2018a). The semi-rigidness of TCJ is usually modeled by giving a certain stiffness to rotational spring without sliding and contact effects in dynamic analysis.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of wedge-pin joint for the dynamic analysis of a planar temporary demountable structure

Yang

Hui

et al. 2020

Advances in Structural Engineering

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In order to understand deeply the dynamic behavior of a Temporary Demountable Structure (TDS), a 2-D analytical model of the Wedge-Pin Joint (WPJ) is established. This model takes into account of the semi-rigidness of the vertical contact and the sliding between beam and column based on the frictional shear-slip mechanism. The analytical WPJ model is validated by comparing with the dynamic responses of the TDS modeled with that obtained from the finite element model under harmonic load. Furthermore, a thorough dynamic analysis of the TDS subjected to a bipedal walking force is conducted. Results show that the hysteretic effect of the WPJs can be induced in the system. It is strongly affected by the amplitude of excitation, and a larger excitation does not mean a stronger hysteresis. This can be interpreted by that large horizontal contact force for joints resulted from strong excitation in horizontal direction yields high friction, which enhances the clamping effects in vertical and then weakens the hysteretic effect of WPJs. In addition, the vertical slip for joint is limited to a small value due to a relative small acceleration, this small vertical slip leads to a small of hysteretic loop. Finally, it is also found that the semi-rigidness of WPJs can apparently increase the deformation and acceleration of the system in both horizontal and vertical directions. This research provides for the first time an analytical model of WPJs of TDS, which will be beneficial to the future research of human-TDS interaction.

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Section: The Jointmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Modeling of wedge-pin joint for the dynamic analysis of a planar temporary demountable structure

Yang

Hui

et al. 2020

Advances in Structural Engineering

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“…The mean square area of the wooden shores is obtained by measuring the cross sections of the wooden shores, and it is calculated as 30.25 cm 2 . The cross-sectional moment of inertia is Iy = Iz = 76.2552 cm 4 .…”

Section: Dimensions and Materials Propertiesmentioning

confidence: 99%

“…Pieńko and Błazik-Borowa investigated the nodes of scaffolds based on numerical analysis, in which the load-bearing capacitiy of the nodes of scaffolds were analyzed by considering joint interaction of scaffolds with the use of nonlinear material [3]. Jia et al investigated the slipping and rotational stiffnesses in the right-angle coupler connections of scaffolds based on experimental tests, and they focused on some specific issues, such as bolt-tightening torques, different coupler combinations, loading patterns, and conditions of new and old components [4]. Zhao et al investigated the influence of member imperfection and joint stiffness on the load-bearing capacity of modular scaffolds by using the finite element method, where the influences of the splice joint stiffness and the screw jack stiffness on the load-bearing capacity of modular scaffolds were discussed [5].…”

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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“…Papers [1,7,11,15] are solely or partially devoted to this issue. Articles [12] and [18] show laboratory tests on the flexibility of various scaffold joints. In paper [11] it is demonstrated that the consideration of flexibility in the case of scaffolds influences the calculation time and the obtained results.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Ledger-Stand Joints in the Aluminum Modular Scaffold

Błazik‐Borowa¹,

Pieńko²,

Robak³

et al. 2017

Archives of Civil Engineering

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This paper concerns an approach to model the ledger-stand joints of modular scaffolds. Based on the analysis of the working range of the ledger (represented by a linear relationship between load and displacement), two models of the ledger-stand joint are analysed: first -with flexibility joints and second -with rigid joints and with a transition part of lower stiffness. Parameters are selected based on displacement measurements and numerical analyses of joints, then they are verified. On the basis of performed research, it can be stated that both methods of joint modelling recommended in this paper, can be applied in engineering practices.

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Mechanical properties of right-angle couplers in steel tube–coupler scaffolds

Cited by 20 publications

References 23 publications

Modeling of wedge-pin joint for the dynamic analysis of a planar temporary demountable structure

Modeling of wedge-pin joint for the dynamic analysis of a planar temporary demountable structure

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

Analysis of Ledger-Stand Joints in the Aluminum Modular Scaffold

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