Calculation of wind forces on lattice structures made of round bars by a local approach

Prud׳homme, Simon; Légeron, Frédéric; Langlois, Sébastien

doi:10.1016/j.engstruct.2017.11.065

Cited by 10 publications

(5 citation statements)

References 6 publications

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“…A review of the literature shows that the aerodynamic coefficients for different configurations of transmission towers are rarely available (Deng et al 2016). A few researchers have attempted to develop local approaches where the wind forces are evaluated in straight-line conditions on each truss member separately and then summed to assess the total wind forces exerted on the structure (Prud'homme et al 2014(Prud'homme et al , 2018. The method, although promising, is shown to be infeasible in cases of a transmission tower where there are hundreds of truss members with different orientations and alignments.…”

Section: State-of-the Art Approach In Calculating Tornado Loadsmentioning

confidence: 99%

Analytical Approach to Characterize Tornado-Induced Loads on Lattice Structures

et al. 2020

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This paper presents a quasi-steady technique that combines aerodynamic force coefficients from straight-line wind tunnel tests with empirically developed tornado wind speed profiles to estimate the time history of aerodynamic loads on lattice structures. The methodology is specifically useful for large and geometrically complex structures that could not be modeled with reasonable scales in the limited number of tornado simulation facilities across the world. For this purpose, the experimentally developed tornado wind speed profiles were extracted from a laboratory tornado wind field and aerodynamic force coefficients of different segments of a lattice tower structure were assessed for various wind directions in a wind tunnel. The proposed method was then used to calculate the wind forces in the time domain on the model lattice tower for different orientation angles with respect to the tornado's mean path based on the empirical tornado wind speed profiles and the measured aerodynamic force coefficient of each tower segment, where the wind field at the tower location was updated at each time step as the tornado went past the tower. A tornado laboratory simulation test was conducted to measure the wind loads on a scaled model of a lattice tower subject to a translating tornado for the purpose of validation of the proposed method. The moving average of the horizontal wind force on the lattice tower model that was calculated with this method compared very well with that measured in a laboratory tornado simulator, which paves the way for the use of straight-line wind tunnels to assess tornado-induced loads on a lattice structure and possibly other similar structures.

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Section: State-of-the Art Approach In Calculating Tornado Loadsmentioning

confidence: 99%

Analytical Approach to Characterize Tornado-Induced Loads on Lattice Structures

et al. 2020

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“…Azzi et al [3] used aeroelastic models to assess the response of multi-span transmission line systems under various wind speeds and directions, indicating the differences in aerodynamic response between multi-span systems and individual lattice towers. Prud et al [4] studied the aerodynamic coefficients of single cylindrical bodies and developed a local calculation method to compute the wind loads on lattice structures. Martín et al [5] measured the drag coefficient and interference factors of square-section lattice towers with dish antennas through wind tunnel experiments, finding that interference factors depend on wind direction and the position of antennas on the tower section.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Influence of Antenna Arrangement Parameters on the Aerodynamic Performance of Telecommunication Towers

Jia,

Huang,

Liu

et al. 2024

Applied Sciences

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With the widespread adoption of 5G telecommunication networks, to reduce construction costs, it has become necessary to add new equipment or antennas to existing 4G and 3G telecommunication towers. This significantly changes the original aerodynamic shape of the towers, leading to a substantial increase in the wind load, which may exceed the original structure’s bearing capacity and pose a threat to the structure’s safety. This study employed three-dimensional numerical simulation methods to systematically investigate the impact of various antenna arrangement parameters, such as the arrangement number, arrangement form, and arrangement layers, on the wind load characteristics of telecommunication towers. The findings revealed that the antenna arrangement form significantly affects the sensitivity of the telecommunication tower’s wind load to the wind direction, with more uniform antenna arrangements resulting in less sensitivity. Compared to the drag coefficient and the windward base overturning moment coefficient, the tower’s lateral force coefficient and the crosswind base overturning moment coefficient are more sensitive to changes in the wind direction. The change patterns in the tower’s overturning force coefficient and overturning moment coefficient with the antenna arrangement number are essentially the same. However, as the antenna arrangement number increases, the growth rate of the tower’s overturning moment coefficient is about twice that of the overturning force coefficient. The tower’s overturning force coefficient increases approximately linearly with the increase in antenna arrangement layers, while the tower’s overturning moment coefficient exhibits a nonlinear increase with the increase in antenna arrangement layers. The rate of increase in the wind load with the antenna arrangement layers is significantly greater than that with the antenna arrangement number. Thus, to reduce wind load, it is advisable in practical engineering applications to increase the antenna arrangement number per layer, thereby reducing the antenna arrangement layers. The study also summarized a calculation method for the structural wind load of telecommunication towers, taking into account the influence of antenna arrangement parameters, providing a reliable basis for the structural design and safety assessment of telecommunication towers in practical engineering.

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“…Wind load is a key issue from the perspective of reliability of lattice systems serving as support structures for telecommunication equipment [15][16][17][18][19][20][21][22]. The level of wind load determines whether a structure is suitable with regard to its rigidity (serviceability limit state, SLS), load-carrying capacity (ultimate limit state, ULS), or susceptibility to vibrations.…”

Section: Introductionmentioning

confidence: 99%

Using full‐scale tests results for designing of steel telecommunication towers

Szafran¹

2021

ce papers

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The main goal of this paper is to provide recommendations for designing state‐of‐the‐art and lightweight steel lattice telecommunication towers which offer the highest possible load‐carrying capacity. The design rules presented in the paper are based on experimental results obtained for two independent tower structures. Full‐scale facilities, namely 42‐m‐high towers were tested. Stresses in compressed legs of lower segments of the towers, displacements of their tops, and, notably, failure mechanisms are analyzed. Technical solutions including additional equipment, such as service platforms and cable and access ladders, are also considered. Means of reinforcing tower structures with a focus on modifying buckling strength of legs and diagonal bracings are also discussed and justified.

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Calculation of wind forces on lattice structures made of round bars by a local approach

Cited by 10 publications

References 6 publications

Analytical Approach to Characterize Tornado-Induced Loads on Lattice Structures

Analytical Approach to Characterize Tornado-Induced Loads on Lattice Structures

Analysis of the Influence of Antenna Arrangement Parameters on the Aerodynamic Performance of Telecommunication Towers

Using full‐scale tests results for designing of steel telecommunication towers

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