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Development of Design Wind Load Calculation for Transmission Towers: Accounting for Cross-arm and Diaphragm Effects
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DOI：10.1142/S0219455426504110.png)
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Abstract
En 中文
Wind-induced vibration of cross-arms constitutes a critical consideration in the wind-resistant design of transmission towers (TTs). However, the current codes and standards for TTs worldwide fail to adequately account for the impact of cross-arms and diaphragms on design wind loads (DWLs). To develop DWLs for TTs, a structured calculation framework was proposed to improve the wind-induced vibration coefficient beta(z), which is a key parameter for DWLs. Based on the effective static load distribution (ESLD) method, the DWL formulae of uniformly-shaped TTs were derived in the frequency domain. By introducing a series of correction coefficients, refinement from a simplified model to a practical computational model of TTs is achieved step by step, thereby determining the DWL for TTs with cantilevered cross-arms. Nonlinear fitting and tabulation simplified complex integrals in parameter beta(z), enhancing applicability of DWLs. The derived DWLs were verified through time domain analysis employing a finite element model representing an actual TT. Parametric analyses were conducted to determine the influence of cross-arms and diaphragms on the DWLs for TTs. The results indicate that cross-arms play a major role in influencing beta(z), mainly due to their resonant component of equivalent static wind loads (ESWLs), whereas diaphragms contribute minimally to these parameters. Diaphragms have minimal influence on DWLs in approximate calculations.
Keywords:
Transmission tower
effective static load distribution method
design wind loads
cross-arm
diaphragms
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