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The Environmental Loads and Ultimate Carrying Capacity of Large Span Transmission Tower-line System

Author: YangJunTao
Tutor: LouWenJuan
School: Zhejiang University
Course: Structural Engineering
Keywords: Long Span Transmission Line System Wind becoming rain load Discrete phase Dynamic bearing capacity
CLC: TU312.1
Type: Master's thesis
Year: 2011
Downloads: 144
Quote: 1
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Abstract


Span transmission line system can cross obstacles such as mountains and valleys, four loop pipe span transmission tower has four cross arm, with a small footprint, transmission power and more features. Since four loop pipe span transmission tower height is high, cross arm length is long, which makes the line system in the environmental loads of ultimate bearing capacity and common line systems differ. Span transmission line system to withstand the environmental loads are wind loads, rain loads and ice loads. This paper studies the rain load on the role of transmission towers and large span transmission line system under extreme environmental load carrying capacity. Numerical simulation of the load against rain, wind entrance first solve the question: In this paper, harmonic superposition method to generate open space of fluctuating wind speed time, and as a simulation of flow field inlet; Second, we must solve the problem of rain particle simulation: using discrete phase simulated raindrops, with the discrete vortex model to simulate transient flow field; finally solving raindrops load, according to the impulse conservation theorem, the average interval of 0.25s rain load schedule. The results show: When the rainfall intensity is 709.2mm / h, wind speed of 10m / s, the average rain load and wind load ratio maximum of 2.53% in 18m height; rain load and wind load ratio decreases with increasing altitude . For large span transmission line system static ultimate bearing capacity, first established three cross two towers ANSYS finite element model; Secondly, based on existing norms, the model in four wind directions under static load carrying capacity limits analysis, has been the most unfavorable wind angle and wind angle of each failure mode under load and ultimate load carrying capacity. Study found that: the destruction of the tower line system under pressure from the bottom side of the prism begins; when considering the impact of bending force on the shaft, transmission tower bottom corner posts to stress yield load will be reduced; tower line system control wind angle of 45 degrees wind angle, the ultimate load is 2.083 times the design load. In order to study the power line system ultimate bearing capacity, we calculated line system of the three wind load conditions of the time history response. Found: In the 10m high average wind speed 50m / s wind power loads, power transmission Tada carrying capacity to the limit state, the bottom corner posts first yield pressure, destroyed fluctuating wind speed at a height of 10m is 55.1m / s.

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CLC: > Industrial Technology > Building Science > Building structure > Structure theory to calculate > Structural loads and structural capacity > Structural load analysis
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