Study On The Mechanical Properties And Engineering Application Of 60 Degree Angle Steel

As the demand for electricity is increasing and the power system technology is on the upgrade constantly, the transmission tower design load will be bound to increase. However, China’s high-voltage transmission towers typically use the quadrilateral electrical towers. At present most of angle steels used in the transmission tower are the angle steels with an angle of 90 degrees for two limbs, which could not meet the impact of increased load of the tower design and seriously hampers the development of China’s electric power industry.In this paper, the 60 degree angle steel, with the higher instability force, the better economy and other characteristics, compares to the traditional angle steel; besides, the triangular cross-section power tower, with 60 degree angle steels as its components, will be smaller constraints stress, temperature stress and the wind resistance and materials consumption, more stable structure within the triangle plane than the quadrilateral electric tower. Therefore, it is necessary to study the mechanical properties of the 60 degree angle steel and the triangular electrical tower.This paper will complete the following task:First, according to the theory of the instability of the thin-walled structure, we do research into the theoretical analyzing of the local buckling and integral buckling of the axial compression 60 degree angle steel. Using the principle of "Equal Stability" the width to thickness ratio limitation, which is suitable for 60 degree angle steel, is deduced.Second, by the finite element simulation technology, we analyze numerous representative sections of 60 degree angle steels, and modify the width to thickness ratio limitation expression. Besides, we study the integral buckling critical force of hinged at both ends and single connection axial compression of the 60 degree angle steel and ordinary angle steel, which shows that in the case of the same timber, the 60 degree angle steel has the greater integral buckling critical force and overall stability.Third, we apply 60 degree steel angle to the triangular cross-section power tower cell, and calculate ultimate bearing capacity under different working condition. As contrasted the results to the electrical tower cell with 90 degree steel angle as its components, we find that the former has greater ultimate bearing carrying capacity and economy.Finally, prospect the further study on the analysis of mechanical properties and engineering application for 60 degree-angle steel in the future.