角度风对转角塔水平荷载的影响

分析了转角杆塔设计时的荷载取值,将杆塔水平荷载分为水平风压荷载和水平张力荷载2种,考虑风对转角塔2侧电线的作用及对电线张力的影响,得出角度风作用下转角杆塔的综合水平荷载公式,并根据实际算例,探讨了杆塔最大水平荷载与大风角度的关系。结果表明,对于转角度数较大的转角杆塔,有必要根据实际情况计算角度风对水平荷载的影响。

多回路输电线路转角塔荷载计算探讨

目前多回路输电线路转角塔不同层导地线风压荷载的计算高度均按各层实际高度取值,但对不同层导地线张力荷载计算时,却统一取下层导线平均高,这种计算方法对于多回路塔头尺寸较大杆塔计算偏差较大。本文基于架空输电线路荷载规范,提出了转角塔导地线风压和张力荷载按照各层导地线实际高度、风与导地线的实际角度进行计算的理论方法及其参数取值,并进行算例分析。结果表明,按本文计算方法测算500 kV双回路小角度杆塔塔重增加约0.8%,大角度杆塔塔重减少约5.8%,杆塔横担位置的材料规格会普遍增大1~2个规格。本文所提出的思路和方法,可为设计人员计算多回路输电线路转角塔荷载时提供参考。

Durability of Stress Ribbon Bridge Checked during Loading Test

Stress ribbon bridges have many advantages and became recently more popular mostly because of their versatile form, slender decks giving a light aesthetic impression and durability assured by post tensioned concrete. The paper presents the first in Poland stress Ribbon Bridge constructed last year. A static and dynamic analyse of the model is presented as well as construction solutions which were used to achieve the highest durability. The bridge was checked during static and dynamic load test. The results of this prove test were compared with results obtained from examination and study of other different bridge structures. It confirmed that the bridge has good dynamic resistance and greater stiffness than assumed in the design.