Analysis of Type Selection and Wind Load Parameters of Long-Span Prestressed Pipe Truss Structures

The prestressed pipe truss structure has good mechanical properties and economy， which can meet the long-span requirements of the closed structure of the coal storage yard. Based on the wind tunnel test of the coal storage yard structure（with a span of 170 m） at Yushuwan Coal Mine， the most unfavorable wind direction angle of the prestressed pipe truss structure and the wind load shape coefficients of different zones were clarified. The mechanical properties and structural dynamic characteristics of each scheme were analyzed under wind load and earthquake conditions， such as internal forces/stresses and displacements of members， support reaction forces， and cable stresses. The results showed that the variations in internal forces along the three-center circular axis of each design scheme were similar， with negligible variations in magnitude. However， the stress varied significantly across individual member cross-sections in each scheme. Notably， members with combined rectangular and inverted trapezoidal cross-sections exhibited higher stress. The cross-sections designed with an inverted triangle or a combination of an inverted trapezoid and an inverted triangle exhibited higher stiffness， resulting in smaller displacement responses and internal forces， while the latter design required slightly more steel material. The comprehensive analysis showed that the section form designed with an inverted triangle exhibited good mechanical properties and economy， making it a preferred choice in design.