为研究长横担输电塔扭转向等效静力风荷载的计算方法，以弹簧-多质点模型为基础提出了多自由度扭转向振动方程，并从频域角度对方程进行了求解。在考虑一阶扭转振型贡献的基础上，采用惯性风荷载法提出了扭转向等效静力风荷载的计算公式。基于塔架结构顺风向体型系数及准定常理论，对塔架节段的扭转向风荷载谱进行了推导。其次，针对直流输电塔特有的几何构型及动力特性，提出简化模型并对振动方程及风荷载谱的计算公式进行简化。最后，以准东-华东±1100kV输电工程角钢塔为例，将采用上述方法的得到的输电塔主材、斜材及横隔材轴力与动力时程分析及我国规范方法的计算结果进行了对比。结果表明，与规范方法相比，上述方法能提高主材、斜材和横隔材的设计可靠度，特别对塔身斜材及横隔材的可靠度提高较大，可分别达98.5%及89.8%以上。
Abstract
To investigate the calculation method of equivalent static wind load (ESWL) in torsional direction of long cross arm transmission tower, its multi-DOF torsional vibration equations were derived and solved in frequency domain based on the spring-multi-mass point model. Considering the contribution of the first order torsional mode, the calculation formulas of ESWL in torsional direction were deduced with the inertial wind load (IWL) method. Based on the downwind shape coefficient of tower structure and the quasi-steady theory, the torsional wind load spectrum of tower segment was deduced. Secondly, according to the special geometric configuration and dynamic characteristics of DC transmission tower, a simplified model was proposed to simplify vibration equation and the calculation formula of wind load spectrum. Finally, taking the Zhundong-East China ±1 100 kV angle steel transmission tower as an example, the calculation results for axial force and dynamic time history analysis of main materials, inclined ones and diaphragm ones of the transmission tower obtained using the proposed method were compared with those obtained using the method of our country code. The results showed that compared with the method of our country code, the proposed method can improve the design reliabilities of main materials, inclined ones and diaphragm ones, especially, the reliabilities of the tower body’s inclined materials and diaphragm ones increase greatly, they can reach 98.5% and 89.8%, respectively.
关键词
长横担输电塔 /
等效静力风荷载 /
扭转效应 /
惯性风荷载法
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Key words
long cross arm transmission tower /
equivalent static wind load (ESWL) /
torsional effect /
inertial wind load (IWL) method
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