关键词: 后张预应力, 空间分析, 截面受力特性, 数值分析

Abstract: Taking Chongqing Yudong Yangtze Bridge as an example,according to the state of three-dimensional space,the installments loaded cantilever construction of prestressed long-span bridges is studied by numerical analysis method.Be-cause of the existence of pore reserved for pre-stressed,the mechanical properties of cross-section have been influenced.The comparison is carried out between it and the calculation results of plane structures.The result shows that it has obvious differences at various stages,meanwhile,it is pointed out the potential dangers these in fluences may bring to the bridges.

Key words: post-tensioning prestress, space analysis, mechanical characteristics of cross-section, numerical analysi