波形钢腹板预应力梁桥体外索参数有限元分析

采用混合单元建立波形钢腹板体外预应力混凝土组合简支箱梁桥的空间有限元计算模型，研究该种结构在体外索参数，如张拉力、锚固点位置及转向点位置改变时，各截面的力学性能，计算结果表明：转向点之间中段各截面的正应力只与张拉力有关；锚固点至转向点之间边段各截面的正应力才与各参数有关．文中结果为该种桥梁的体外配索设计提供了理论依据．

Finite Element Analysis of External Tendon Parameters of Prestressed Girder Bridge with Corrugated Steel Webs

A 3D finite element model of an externally prestressed concrete simple-supported composite box-girder bridge with corrugated steel webs is established by means of the composite element method. By the proposed model, the mechanical behaviors of the various sections in the structure with different external tendon parameters, such as the tensile force, the positions of the anchorage point and the diversion point, are investigated. Calculated results show that the normal stresses of the various sections in the middle range between two diversion points only depend on the tensile force, while those in the edge range between the anchorage point and the diversion point depend on all parameters. The above-mentioned results provide a theoretical basis for the arrangement of externally prestressed tendons of composite box-girder bridge.