Economic Analysis of Steel Truss-Concrete Hybrid Structures

Steel truss-concrete hybrid structures achieve significant economic optimization through material synergy. Taking the Xiangjiaba Bridge as an example, this structure saves 53% of concrete and 81% of prestressed steel bars compared to traditional PC continuous rigid frames, reducing the cost by 47% and shortening the construction period by 40%. Its lightweight design (reducing self-weight by more than 50%) and towing construction technology further reduce project costs, making it particularly suitable for large-span bridge construction.

The sealed rust-proof performance of concrete-filled steel tubes and the structural advantages of intersecting nodes reduce later maintenance costs. The circular steel tube section has equal strength in all directions, high torsional stiffness, a smooth outer wall, low wind resistance, and better durability. The Ganhaizi Extra Large Bridge case shows that this structure can still save 40% of the construction period through towing erection technology in complex mountainous terrain, with outstanding comprehensive benefits.