高维成  沈世钊
    （哈尔滨工业大学  150090）

[提要]  对预应力箱型楼盖结构的结构形式、构造特点及施工方式等进行研究，同时运用SAP91程序及弹塑性有限元程序对24m×24m箱型楼盖算例进行力学性能分析，从而充分证实预应力箱型楼盖结构是一种合理、经济的空间结构体系，可满足大跨度建筑的需要。弹塑性分析结果表明，对于大跨度预应力混凝土楼盖结构，考虑弹塑性影响十分必要。
[关键词]  箱型楼盖  结构形式  力学性能  薄膜内力  弯矩  弹塑性

The structural form, character and the construction technology of the prestressed box floor frame were studied. Mean-while, the SAP91 and the elastic-plastic finite-element program were applied to the calculating analysis of the 24m×24m box floor frame. As a result, it has been fully verified that the prestressed box floor frame system is a kind of reasonable and economical space structural system and meets the demands of large span floor frame. The analysis indicates that it is very important to consider the elastic-plastic on the large span prestrssed concrete floor frame.
Keywords: box floor; structural form; mechanics properties; membrane internal force; bending moment; elastic-plastic