输电线路历年规程与新荷载规范风荷载对比

Comparison of Wind Load on Transmission Lines Between Old Codes and New Load Code

摘要:
目的为了确定沿海存量线路是否满足新荷载规范设计要求，探讨历年规程风荷载设计值与新荷载之比。
方法梳理了历年规程与最新荷载规范的各荷载系数，计算典型500 kV及220 kV线路风荷载设计值并加以对比。
结果分析计算得到历年规范风荷载设计值与最新规范的占比平均数。
结论部分按照旧规范设计存量线路可靠度较低，不满足最新荷载规范的要求，需要加固或重建。

Abstract: ［Introduction］ The paper aims to find out whether the existing lines meet the requrements of new load code. And the ratio of design value of wind load between old codes and new code is discussed.
Method In this paper， different load factors of different codes were given and the wind load design values of typical 500 kV and 220 kV lines were calculated and compared.
Result The proportion of wind load design values calculated by different old codes to new load code were given.
Conclusion Our data suggest that some of the existing lines designed by old codes not meet the requirements of new load， and have low reliability， they should be reforcement or reconstruction.