（清华大学建筑设计研究院有限公司，　北京 100084）

［摘要］空间曲线环梁是多跨等截面连续变标高混凝土梁，虽然外形美观，但受力形态较复杂，在温度和其他荷载作用下易产生较大拉力。空间曲线环梁整体刚度不足，在梁中施加预应力后，会出现较大的内力重分布，对相邻梁柱产生次弯矩，与传统的直线预应力梁或等标高预应力环梁相比具有受力状态复杂、内力重分布较大、设计和施工难度较高等特点。以长春奥林匹克公园体育场顶部空间曲线预应力环梁的设计为例，计算分析了空间曲线环梁在重力、温度、预应力等效荷载及屋盖索膜结构传来的荷载等多种荷载组合下的最不利内力，并考虑了空间曲线环梁在预应力施工前、施工中、施工后的受力情况，分析预应力在空间曲线环梁中的重分布。通过设置直线预应力筋、曲线预应力筋抵抗梁本身的轴拉力和弯矩，改善了受力状态，保证了空间曲线环梁具有适宜的刚度和抗裂性能，为空间曲线预应力环梁的结构设计提供参考。

［关键词］长春奥林匹克公园体育场； 空间曲线预应力环梁； 预应力重分布； 温度效应； 预应力施工模拟

中图分类号：TU393-3文献标识码：A文章编号：1002-848X(2018)24-0013-06

Stress analysis and prestress application of spatial curved ring beams of Changchun Olympic Park Stadium

Zhuang Yibin, Jiang Bingli, Yang Xiao, Zhu Duo′e

(Architectural Design & Research Institute of Tsinghua University Co.， Ltd.， Beijing 100084， China)

Abstract:Spatial curved ring beams are multi-span concrete beams with constant cross-section and continuous variable elevations. Although they are beautiful in appearance, their mechanical forms are complex, and large tensile forces are easy to generate under temperature and other loads. The overall stiffness of spatial curved ring beams is insufficient. After applying prestress force in the beam, there is a large redistribution of internal force to produce secondary bending moments on the adjacent beams and columns. Compared with traditional linear prestressed beams or equal-elevation prestressed ring beams, spatial curved ring beams have more complicated mechanical state, larger redistribution of internal force, and higher difficulty in design and construction. Taking the design of the spatial curved prestressed ring beams at the top of Changchun Olympic Park Stadium as an example, the most unfavorable internal forces of the spatial curved ring beams were calculated and analyzed under the combined loads of gravity, temperature, prestress equivalent load and loads from cable-membrane structure roof. The calculation and analysis considered the mechanical conditions of the spatial curved ring beams before, under and after the prestressed construction, in order to analyze the redistribution of prestress in spatial curved ring beams. By installing linear and curved prestressed tendons to resist the axial tension and bending moment of the beams, the mechanical state was improved, and the suitable stiffness and crack resistance of the spatial curved prestressed ring beams were guaranteed, which provided a reference for the structural design of the spatial curved prestressed ring beams.

Keywords:Changchun Olympic Park Stadium;  spatial curved prestressed ring beams; prestress redistribution; temperature effect; prestress construction simulation

作者简介：庄艺斌，学士，一级注册结构工程师，Email：yibinqz@163.com。