兰州市小西湖黄河大桥设计分析

Design Analysis of Xiaoxihu Yellow River Bridge in Lanzhou City

通过兰州市小西湖黄河大桥的设计,对部分斜拉桥桥型的选取进行了细致的比选和分析,并对其桥长进行了拟定,孔跨进行了划分.设计中梁高的选择除考虑结构的整体受力外,还应兼顾施工中梁段混凝土的悬臂灌注;塔高的决定除在技术经济上把握以外,还应考虑景观的需要,并通过受力计算确定斜拉索的根数、索间距及无索区的长度.全桥静动力的分析计算不考虑结构非线形影响,但通过斜拉索的名义弹性模量来抵消斜拉索垂度的影响.从而阐明了部分斜拉桥的主要设计过程及特点.

Through the design of the Xiaoxihu Yellow River Bridge in Lanzhou City and part cable stayed bridge through comparison and choice of project according to bridge aesthetics and engineering price. Due to be restricted by manual work harnessing width of Yellow River in Lanzhou City, the length of bridge was designed 300m. The disposal of span was 81.2+136 + 81. 2m. The girder high and tower high were reasonable no matter in bear force and sight effect. The request of cantalever construction and admit stress took into account in the choice of cable. This paper mainly illustrates the design process and characteristic of the part cable stayed bridge.