考虑施工过程的大跨度预应力张弦结构拉索优化分析

CABLE OPTIMIZATION ANALYSIS OF LARGE-SPAN PRESTRESSED STRING STRUCTURE CONSIDERING CONSTRUCTION STAGE

大跨度张弦结构多考虑设计阶段对于拉索进行优化分析,在施工阶段,结构的形态会随着边界与节点的连接、所受荷载以及结构本身参与度的变化不断产生变化,结构在施工阶段受力与结构成型后的使用阶段不同。因此大跨度预应力张弦结构的拉索优化分析也必须考虑施工阶段不同施工过程的影响。以某采用滑移施工法的大跨张弦拱桁架结构工程进行施工阶段的拉索优化分析,通过采用有限元软件MIDAS对施工阶段拉索设计位置、下垂度进行施工过程的仿真模拟分析,对拉索优化提出设计建议。研究方法和研究成果可为大跨预应力弦桁结构的设计和施工提供借鉴。

The cable optimization analysis of large-span string structures is largely carried out considering the design stage.However,structures change constantly along with the boundary-node connections,load and structural involvement in the construction stage.That is,the stress on structures varies in construction and use stages.For the cable optimization analysis of large-span prestressed string structures,therefore,the impact of construction processes must be taken into account.Taking a largespan string arch truss structure completed by means of sliding construction as an example,the cable optimization analysis was carried by simulation of the designed cable location and sag with finite element software MIDAS in the construction process,and design suggestions were proposed regarding cable optimization.Research methods and results provide a reference for the design and construction of large-span string structures.