预应力混凝土低高度梁桥结构形式比较研究

Comparative Study of the Structural Types of Prestressed Concrete Low-height Beam Bridge

对双预应力结构、双面配筋预应力结构、二次预应力结构和常规预应力结构低高度梁桥进行对比设计,分析了不同结构形式低高度梁桥的受力性能、变形性能和经济性.结果表明:优化结构形式和预应力布置可以显著改善预应力混凝土低高度梁桥的结构性能;二次预应力结构克服了双预应力结构与双面配筋预应力结构的不足,与常规预应力结构相比,在降低梁高的同时,大幅度减小了梁的徐变上拱值50%以上,并节省预应力筋10%以上,具有明显的技术经济优势.

Four structural types of low-height beam bridge corresponding to bi-prestressed concrete structure,double-side prestressed concrete structure,twice prestressed concrete structure and conventional prestressed concrete structure were employed to compare their mechanical performance,deformation performance,and economy.It has been found that the optimization of structural types and prestress configuration can effectively ameliorate the structural performance of prestressed concrete low-height beams.Twice prestressed concrete structures can reduce the architectural height,decrease the creep camber by up to 50%and save the prestressing steels by more than 10%,compared with the conventional prestressed concrete structures,and have more techno-economic advantages than other three prestressed concrete structures.