某混合斜拉桥曲塔预应力钢束空间张拉顺序分析

Tension Analysis of Prestressed Steel Beam of Curved Pylons of A Hybrid Cable-stayed Bridge

为确定施工阶段曲塔的预应力钢束空间张拉顺序,确保曲塔在预应力张拉阶段的受力合理,以某混合斜拉桥的曲塔为工程背景,详细介绍了该桥曲塔的构造和预应力布置的特点,计算了桥塔关键截面的预应力配筋率,并与预应力混凝土箱梁0号块的配筋率进行了对比,采用有限元分析软件Midas FEA分析了预应力钢束空间张拉顺序的不同对桥塔的力学特点的影响,并给出了优化后的张拉顺序。

In order to confirm the optimized prestress tension sequence of the curved pylon and ensure the reasonable structure stress at prestressed tendons in tensioning, according to the curved pylons of a hybrid cable-stayed bridge, this paper introduced the structure and the arrangement of prestressed tendons of pylons in detail. The prestress radio of pylons were calculated and compared to the prestress beam＇s. By using the finite element model of midas fea, it analyzed the structure stress behavior in different construction stages of prestress tension sequence of curved pylons, and put forward the optimized prestress tension sequence.