| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a calculation method of a wind pressure load which has high reliability and can secure rational and economical pole design, etc., even if middle weight wires are bundled by a spiral hanger method. SOLUTION: This calculation method of a wind pressure load calculates a wind pressure load applied to wires (cables 3) installed by a spiral hanger method by using the sum of outer diameters of the wires (cables 3). If the total of the sum of the outer diameters of the wires (cables 3) and twice value h of the thickness of the spiral hanger is not larger than the outer diameter of the spiral hanger 4, instead of the sum of the diameters of wires (cables 3), the totalΣhm of corrected vertical heights of the wires (corrected vertical height Hm of the cables), obtained by a formula: rh +r1 +Ih1×sin(θ+Δθ)+Ds(rh : a radius of an uppermost circle, r1 : a radius of a lowermost circle, Ih1 : the distance between the centers of the uppermost circle and the lowermost circle,θ: a rotational angle of a center of gravity of the wires,Δθ: an angle geometrically determined according to the arrangement of the wires, and Ds: the outer diameter of a wire which is a messenger wire), and twice the value h of the thickness of the spiral hanger is used.</p> |
