Wind-induced deflections of freestanding lattice towers

Glanville, M.J.; Kwok, K.C.S.

doi:10.1016/s0141-0296(96)00025-9

Cited by 14 publications

(7 citation statements)

References 9 publications

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“…These research findings agreed with previous full-scale site measurements [101,104]. In an ongoing study on wind-induced deflection responses, the same tower was tested with a mean wind speed applied at an angle varying from 260 to 280 degrees [105]. The obtained deflection values for both along-wind and cross-wind direction showed:…”

Section: Analysis Methods Of Dynamic Responsesupporting

confidence: 88%

Structural Analysis of Lattice Steel Transmission Towers: A Review

Chen¹,

Ou²

2016

J Steel Struct Constr

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Lattice Transmission Towers (LTT) and the associated transmission line systems are important infrastructure in modern society. Due to the complicated load conditions and the nonlinear interaction among the large number of structural components, accurate structural analysis of the LTT systems has been a challenging topic for many years. Still today there are some gaps between research and industrial practice. This paper presents a summary of research outcomes from current literature. Recent developments in structural modelling and failure prediction technology are reviewed in terms of connection joints, individual members and structural systems subjected to static and dynamic loads. The advantages and disadvantages of different approaches have been compared. Finally, the knowledge gaps, associated challenges and possible research directions are highlighted.

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Section: Analysis Methods Of Dynamic Responsesupporting

confidence: 88%

Structural Analysis of Lattice Steel Transmission Towers: A Review

Chen¹,

Ou²

2016

J Steel Struct Constr

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“…The most direct and effective method to obtain the wind-induced responses of a structure is via field measurements, 10–12 but external environment variables cannot be fully controlled at the operation site, and the testing cost is high. The wind tunnel test, which is applied to study wind loads of tower cranes, is a well-developed method.…”

Section: Introductionmentioning

confidence: 99%

Wind-induced tower crane vibration and safety evaluation

Chen

Qin

Yang

et al. 2019

Journal of Low Frequency Noise, Vibration and Active Control

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The maximum wind load direction of tower crane is considered to be perpendicular to its jib. The interference effects of its different segments and across-wind loads are ignored in traditional crane safety evaluation. This study proposes a general scheme for the safety evaluation of tower cranes under fluctuating wind loads. The wind coefficients of a full-scale model of a tower crane were calculated by computational fluid dynamics, and then the time history of wind loads, simulated through the autoregressive method, were applied to the finite element model of a tower crane. The results reveal that the maximum along-wind load direction deflected 30°–60°, and the mean ratio of the absolute value of the across-wind coefficient to the along-wind coefficient of the tower crane was 8.56%, which indicated that the across-wind loads should be taken into account in wind-resistant design. Comparing the wind-induced responses of four typical wind directions, the maximum displacement, the bending stress and the axial stress of the tower crane occurred in the positive direction. Furthermore, the maximum acceleration of the cat-head was 0.028 m/s2, which met the comfort requirements of the operator. Although the tower crane met the strength and static stiffness requirements of design rules, the maximum bending stress at the junctions between the jib and the slewing platform, the counterweight and the counter-jib, exceeded the allowable stress, and the first modal of the tower crane was excited. These results warrant considering the effect of fluctuating wind loads in the safety evaluation of a tower crane.

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“…Tamura et al also investigated the wind‐induced vibrations of a 100‐m high tower and a 77.6‐m high tower at Tokyo International Airport to study the efficiency of the tuned liquid damper during typhoons. Glanville and Kwok measured the wind‐induced responses and the dynamic characteristics of a 67‐m high steel frame communication tower and a 233‐m steel truss TV tower in Sydney, Australia. The along‐wind responses of the two towers were compared with theoretical estimates, and their across‐wind responses were discussed.…”

Section: Introductionmentioning

confidence: 99%

Field measurement and aeroelastic wind tunnel test of wind‐induced vibrations of lattice tower

Huang

Chen

2019

Structural Design Tall Build

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Summary Lattice towers are among the most vulnerable structures during typhoons. In this study, the wind engineering research field base near Shanghai Pudong International Airport was used to measure the mean wind speeds and directions at a height of 10 m, as well as the accelerations atop a 40‐m high lattice tower during Typhoons Neoguri and Nakri to investigate the characteristics of the near‐ground wind and the responses of the lattice tower. Moreover, an aeroelastic model of the lattice tower was generated by the discrete stiffness method. Using the wind tunnel test of the aeroelastic model, the root mean square accelerations of the tower were studied with different wind speeds and directions. The responses of the tower in the across‐wind direction were found always higher than those in the along‐wind direction, which meant the vortex shedding of each single cylinder had an impact on the responses of the tower in the across‐wind direction. The test results were compared with those of field measurements to evaluate the accuracy of the aeroelastic model, and the two were generally in a good agreement. Thus, the aeroelastic model could precisely simulate the dynamic characteristics of a prototypical lattice tower using the discrete stiffness method.

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Wind-induced deflections of freestanding lattice towers

Cited by 14 publications

References 9 publications

Structural Analysis of Lattice Steel Transmission Towers: A Review

Structural Analysis of Lattice Steel Transmission Towers: A Review

Wind-induced tower crane vibration and safety evaluation

Field measurement and aeroelastic wind tunnel test of wind‐induced vibrations of lattice tower

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