Abstract
The design of every new transmission line can address the solutions to fresh engineering problem. Therefore, the selection of the monopole structures in place of conventional lattice towers summarized the obligatory design parameters. The reliability climatic wind loads and the security longitudinal broken wire load combinations influence the internal parameter assessment of the steel pole structures. To assess them, a 60m high double circuit (DC) 220kV line with 305 m basic span is selected. All the Six wind zones (33, 39, 44, 47, 50, and 55 m/s) of India are selected to compute the transverse wind loads on the tower. Secondly broken wire security load in the longitudinal direction is adopted for the load combination for the monopole transmission tower design. With the above data, this paper presented the variation of the internal parameters in the wind zones. It is found that even though the basic wind speed from 33 m/s to 55 m/s is increased to 66.66%, top deflection is increased by 1.6%, a bending moment is enhanced by 6.3 % and shear force is increased by 12.6% only. The results show the change of wind speed has a little effect on the monopole tower. However, the variations of internal parameters in the wind zone are strongly depending on the Longitudinal loading only. The ASCE 48-19 steel monopole code is adopted to design the monopole since the Indian standard design code for monopole was not found. However, when comparing with the Indian Standard general Steel code IS 800-2007(Limit state) design guidelines, the Indian steel code contributes 10% more weight.
Highlights
Steel lattice towers have been utilized to support transmission line system around the world including India
The 60m high monopole structure geometric properties are depicted in Table 1 and figure1, the conductor properties described in table 2
The action of climatic loads related to the transverse wind loads on the monopole as well as conductors is computed with the Gust Factor method
Summary
Steel lattice towers have been utilized to support transmission line system around the world including India. From the last three decades, the population is increasing very rapidly, the power demand is increasing alarmingly since the 1980s. Since the population increases in leaps and bounds, urbanization is developed very quickly. The required land to accommodate transmission lines becomes insufficient and in the case of the acquisition, it is more premium. An alternative methodology is to change the vertical configuration of the Lattice tower structure into the monopole supporting structures. These become a viable alternative in India and East-west and North-South countries around the world. With the latest state of the art manufacturing technical know-how the steel tubular poles made from stronger materials from steel, have become a better market share in India, as well
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