高立人
    （北京四维新建筑科技开发中心 100081）

[提要]  本文介绍了美国佛罗里达州坦帕国际机场南停车楼的上下两座预应力混凝土V型悬臂梁结构螺旋式双车道的设计思想、结构布置和后张预应力实施方案。文中对开裂截面柱在结构整体分析中引起的刚度和内力分配的变化，以及对该高位盘旋结构所做的随机振动的冲击分析都作了一定的论述。
[关键词]  多层车库  预应力混凝土  螺旋 双车道 悬臂梁 开裂截面  随机振动

The design ideology, structural layout and post-tensioning scheme for the prestressed concrete V-type cantilever beams systemrs with 2-lane helices of Tampa international airport south garage are introduced in this paper. The effectiveness based on cracked section of columns in integral structural analysis and the impact analysis for vibration of the long cantilevers are also discussed.
Keywords: car building; screws carriage way; V-type cantilever beam; column; cracked section; prestressed concrete; structural design