架空送电线路基础主柱正截面承载力计算分析

Calculation and Analysis on the Cross Section Bearing Capacity of Foundation Main Post of the Overhead Transmission Line

锡盟—山东1 000 kV特高压交流输变电工程线路工程山东段基础设计全线采用了相当大比例的钻孔灌注桩群桩基础,群桩承台基础主柱的设计计算是群桩承台设计中重要的设计工作,其合理与否将直接影响群桩承台结构设计的安全性和经济性。结合锡盟—山东1 000 kV特高压交流输变电工程线路工程中群桩承台及基柱的设计实践,在考虑不同的偏心角和偏心距情况下,对基础短柱的双向偏心受拉截面配筋分别按DL/T 5219—2005《架空送电线路基础设计技术规定》与GB 50010—2010《混凝土结构设计规范》的相关规定进行计算,通过对计算结果的比较分析,对方形截面双向对称配筋基础短柱的设计提供一些参考意见,即当偏心角在45°附近时,按DL/T 5219—2005与GB 50010—2010计算皆可,按DL/T 5219—2005偏保守;当偏心角远大于45°或远小于45°时,最好按GB 50010—2010的方法进行配筋计算,此时按DL/T 5219—2005计算可能会偏不安全。

The foundation design of Ximeng-Shandong 1 000 kV UHV AC power transmission line project adopts the bored pile foundation in a considerable proportion, in which the main foundation column designing of the group pile foundation is a very important work. Its reasonability will have a direct impact on the safety and economy of the group pile foundation. Combined with the foundation practical design of Ximeng-Shandong 1 000 kV UHV AC power transmission line project and in consideration of different eccentric angle and eccentricity distance, calculation results of different methods for foundation column bearing the biaxial eccentric tension are analyzed and compared according to the relevant provisions of technical regulation for designing foundation of overhead transmission line （DL/T 5219-2005） and code for design of concrete structures （GB 50010- 2010）, and then some reference opinions are provided.