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提出一种适用于大跨度的新型梁。通过找形分析确定能够抵抗荷载的梁形状。以外荷载作用下梁中不出现弯矩为最佳几何形状。此外,采用预应力锚索与梁相结合,限制竖直方向的位移,进行被动位移控制。同时,梁外部的简支结构应确保没有水平力传递给柱。该体系用作某屋顶开敞结构的主梁,以此为例阐明新型梁的设计方法,也验证了该大跨度钢梁体系的有效性。
A new type of beam suitable for large span is proposed. The shape of the beam that can resist the load is determined by the form-finding analysis. Bending moment does not appear in the beam under the load acting as the best geometry. In addition, the use of prestressed anchor and beam combined to limit the vertical displacement, the passive displacement control. At the same time, simply supported structures outside the beam should ensure that no horizontal force is transmitted to the column. The system is used as the main girder of an open roof structure, which is taken as an example to illustrate the design method of the new girder and to verify the effectiveness of the long-span steel girder system.