Bearing capacity of power transmission tower footings near cohesionless slopes

Concrete filled double skins steel tube is a new components which is based on concrete filled steel tubular and use inner steel tube instead of core concrete. The components have many advantages such as little weight, good resistance for earthquake, good stiffness for resist bending and good performance for resist fire, and has been used in bridge pier, high-rise buildings, power transmission tower and so on. While these structures may inevitably suffer impact which comes from vehicles, ships, aircraft, etc. the structures which is impacted have taken much attention. This article will analysis dynamic behavior of concrete filled double steel tube under impact with simply supported, and propose formula of dynamic bearing capacity, laid the foundation for the analysis of impact performance of CFDST.

Download Full-text

Ultrasonic unilateral double-position excitation lamb wave defect detection and quantification method for ground electrode of transmission tower

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-210039 ◽

2021 ◽

pp. 1-15

Author(s):

Kuan Ye ◽

Kai Zhou ◽

Ren Zhigang ◽

Ruizhe Zhang ◽

Chunsheng Li ◽

...

Keyword(s):

Guided Waves ◽

Power Transmission ◽

Geometric Model ◽

Guided Wave ◽

Quantization Error ◽

Dispersion Function ◽

Stable Operation ◽

Transmission Tower ◽

Ultrasonic Guided Wave ◽

Transmission Towers

The power transmission tower’s ground electrode defect will affect its normal current dispersion function and threaten the power system’s safe and stable operation and even personal safety. Aiming at the problem that the buried grounding grid is difficult to be detected, this paper proposes a method for identifying the ground electrode defects of transmission towers based on single-side multi-point excited ultrasonic guided waves. The geometric model, ultrasonic excitation model, and physical model are established, and the feasibility of ultrasonic guided wave detection is verified through the simulation and experiment. In actual inspection, it is equally important to determine the specific location of the defect. Therefore, a multi-point excitation method is proposed to determine the defect’s actual position by combining the ultrasonic guided wave signals at different excitation positions. Besides, the precise quantification of flat steel grounding electrode defects is achieved through the feature extraction-neural network method. Field test results show that, compared with the commercial double-sided excitation transducer, the single-sided excitation transducer proposed in this paper has a lower defect quantization error in defect quantification. The average quantization error is reduced by approximately 76%.

Download Full-text

SEISMIC RESPONSE OF POWER TRANSMISSION TOWER-LINE SYSTEM UNDER MULTI-COMPONENT MULTI-SUPPORT EXCITATIONS

Journal of Earthquake and Tsunami ◽

10.1142/s179343111250025x ◽

2012 ◽

Vol 06 (04) ◽

pp. 1250025 ◽

Cited By ~ 7

Author(s):

TIAN LI ◽

LI HONGNAN ◽

LIU GUOHUAN

Keyword(s):

Seismic Waves ◽

Power Transmission ◽

Incident Angle ◽

Ground Motions ◽

Three Dimensional ◽

Transmission Tower ◽

Line System ◽

Time Stepping ◽

Dimensional Finite Element ◽

Three Dimensional Finite Element

The effect of multi-component multi-support excitations on the response of power transmission tower-line system is analyzed in this paper, using three-dimensional finite element time-stepping analysis of a transmission tower-line system based on an actual project. Multi-component multi-support earthquake input waves are generated based on the Code for Design of Seismic of Electrical Installations. Geometric non-linearity was considered in the analysis. An extensive parametric study was conducted to investigate the behavior of the transmission tower-line system under multi-component multi-support seismic excitations. The parameters include single-component multi-support ground motions, multi-component multi-support ground motions, the correlations among the three-component of multi-component multi-support ground motions, the spatial correlation of multi-component multi-support ground motions, the incident angle of multi-component multi-support seismic waves, the ratio of the peak values of the three-component of multi-component multi-support ground motions, and site condition with apparent wave velocity of multi-component multi-support ground motions.

Download Full-text