淅川小三峡大桥设计

预应力混凝土连续刚构桥因结构受力明确、整体性好、造价较低等优点,在国内桥梁建设中得到广泛应用和发展,但对该类型桥梁优化设计方面的研究却较少。以小三峡大桥设计为背景,提出了对连续刚构桥边中跨比、高跨比、梁底曲线等重要参数进行优化的多目标优化方法并应用于该桥实例,提出连续刚构桥不应取消弯起束,竖向预应力筋应进行二次张拉的设计理念,介绍了小三峡大桥的结构设计及受力分析,为国内同类型桥梁设计提供参考。

Design of Xiaosanxia Bridge in Xichuan

With the advantage of force bearing, wholeness, low price, PC continuous frame bridge have been extensively used and developed in bridge construction. But few studies addressed about optimization designs of this type bridge. Based on the design of Xiaosanxia bridge,Multi-ob-ject optimization for the ratio of side-span and mid-span, the ratio of mid-span and depth of beam at the middle, the index of web-line were pro-posed and used in this bridge. The design concept such as bend beam should not be canceled and vertical prestressed tendons should be second ten-sioning were proposed. Structure design and force analysis was introduced,which could be provided the reference for the same type bridge design in our country.