A 60 year old, 100 m high steel tower: limit states under wind actions

Maberini, F.; Solari, Giovanni

doi:10.1016/0167-6105(92)90639-r

Cited by 17 publications

(8 citation statements)

References 4 publications

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“…This may also explain the very low modal damping values obtained for each of the five bending modes (about 0.20 to 0.30%). The influence of the wind velocity on the damping is reported in [24][25][26]. Ballio et al [24] obtained (total) damping values of 0.68 -0.9 % under a wind velocity of 12.5 m/s for a 100 m tall self-supporting tower in Milan.…”

Section: Fe Model Validationmentioning

confidence: 99%

“…The influence of the wind velocity on the damping is reported in [24][25][26]. Ballio et al [24] obtained (total) damping values of 0.68 -0.9 % under a wind velocity of 12.5 m/s for a 100 m tall self-supporting tower in Milan. Glanville and Kwok [25] studied a 67 m tall self-supporting tower in Australia and obtained values of 0.25, 0.75 and 1% for the three first bending modes under a wind velocity of 20 m/s.…”

Section: Fe Model Validationmentioning

confidence: 99%

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Operational modal analysis of a self-supporting antenna mast

Garcia

Maes

Parnas

et al. 2021

Journal of Wind Engineering and Industrial Aerodynamics

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This paper presents the results of an operational modal analysis on a self-supporting antenna mast. The structure is instrumented with seismic accelerometers, which are moved in different setups for a detailed characterization of the mode shapes. In addition, eight strain gauges are installed, two at the bottom of each leg of the tower. Two particular challenges in the modal analysis are highlighted. First, due to the symmetry of the tower, the bending modes occur in pairs with near to identical natural frequencies and orthogonal mode shapes. These mode shapes change from one setup to another, which complicates the merging of partial mode shapes obtained from different setups. Second, the acceleration signals are polluted by radio signals. It is shown how these two issues are solved, resulting in the identification of five bending modes. The identified natural frequencies and mode shapes are very close to those predicted by a detailed finite element model of the tower, where the vertical columns are modeled using beam elements and the connections between the columns and the braces are assumed pinned. This confirms the validity of such detailed finite element models for the assessment of the dynamic response of these lattice towers under wind loading.

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Section: Fe Model Validationmentioning

confidence: 99%

Section: Fe Model Validationmentioning

confidence: 99%

Operational modal analysis of a self-supporting antenna mast

Garcia

Maes

Parnas

et al. 2021

Journal of Wind Engineering and Industrial Aerodynamics

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“…There is no doubt that numerical modeling and full-scale experiments with skeletal tower structures are still very challenging [1] in engineering practice. It is also well-known that one of the most dangerous loadings is in this particular case a dynamic wind pressure [2,3]. Usually, such towers are designed using different structural steels, but this is not always an optimal solution, because higher segments have their structural efforts rather distant from an optimum.…”

Section: Introductionmentioning

confidence: 99%

Relative Entropy-Based Reliability Assessment of Hybrid Telecommunication Skeletal Towers

Kamiński,

Bredow

2023

5th International Conference on Uncertainty Quantification in Computational Sciences and Engineering

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This paper concerns an alternative methodology of reliability assessment in civil engineering structures based on the relative entropy idea. This relative entropy measures a distance between two random distributions describing an extreme structural effort and its resistance and may be used in time-dependent reliability problems, which is illustrated by dynamical excitation of the skeletal metal tower. The tower under consideration has hybrid character, which enables flexible mass minimization and it consists of upper aluminum part and lower segments made of steel. This structure has been modeled deterministically in the FEM system ABAQUS, while stochastic analysis based upon the generalized stochastic perturbation technique, has been programmed in the computer algebra package MAPLE. The relative entropybased reliability indices have been compared with these obtained from the Eurocode FORM methodology while consecutively randomizing various parameters in this case study.

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“…Field measurement is one of the most direct and effective methods. Ballio et al [5] conducted a field measurement on a transmission tower of 100 m high that was built more than 60 years ago. The study shows that the responses of the transmission tower in the crosswind and along-wind directions are of the same magnitude.…”

Section: Introductionmentioning

confidence: 99%

Wind Tunnel Tests of an Aeroelastic Model of a Long-Span Transmission Tower

Yao

Shen

et al. 2022

Sustainability

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The modal analysis of a long-span transmission tower was carried out using a finite element method, and then its aeroelastic model was established by the discrete stiffness method for wind tunnel tests. The displacement and acceleration of the aeroelastic model were measured by a vision-based displacement measuring instrument and accelerometer, respectively. Also, the wind-induced responses of the tower were conducted by finite element calculation, with which the results of the wind tunnel tests are compared. The gust response factor was calculated and compared with those from the specifications and other studies. The results show that the vision-based displacement instrument can record well the vibration of the model tower in the wind tunnel. The acceleration of the tower is dominated by the first-order resonant response, whereas the displacement is dominated by the background response. The displacement and acceleration in the longitudinal and transversal directions are almost equal, indicating that the crosswind and along-wind responses are of the same magnitude. The displacement atop the tower obtained from the test after considering the Reynolds number correction almost coincided with that from the numerical simulation. The gust response factor of the tower obtained via wind tunnel tests is smaller than that of the codes and close to that found via finite element calculations.

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A 60 year old, 100 m high steel tower: limit states under wind actions

Cited by 17 publications

References 4 publications

Operational modal analysis of a self-supporting antenna mast

Operational modal analysis of a self-supporting antenna mast

Relative Entropy-Based Reliability Assessment of Hybrid Telecommunication Skeletal Towers

Wind Tunnel Tests of an Aeroelastic Model of a Long-Span Transmission Tower

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