组合钢板梁的弯扭稳定设计

Design of Lateral-torsional Stability of Composite Steel-plate Girder

摘要:

为了合理进行组合钢板梁弯扭稳定设计，分析了大横梁组合梁、小横梁组合梁、无中横梁组合梁3种组合钢板梁的弯扭稳定性特点，介绍了一种基于欧洲规范并与我国现行设计规范相协调的弯扭稳定简化设计方法，并通过2个设计示例进行了演示。所介绍的方法将弯扭稳定问题简化为压杆稳定问题，具有概念清晰、设计操作方便、适应多种结构形式和荷载布置等特点，有助于在组合钢板梁设计中合理配置主梁和横向构件，实现良好的安全性、经济性。

Abstract:

In order to rationally design the lateral-torsional stability of composite steel-plate girders， the characteristics of the lateral-torsional stability of three kinds of composite steel-plate girders such as large crossbeam composite girder， small crossbeam composite girder and non-middle crossbeam composite girder are analyzed. A simplified design method of lateral-torsional stability based on the Eurocode and in accordance with the current design code in China is introduced. Two design examples are used to illustrate the simplified design method. The method simplifies the lateral-torsional stability problem to the stability of a pressure bar. This method has the characteristics of clear concept， convenient design and operation， and suitable for a variety of structural forms and load layout， and is helpful to rationally arrange the main girders and transverse members in the design of composite steel-plate girders to achieve the good safety and economy.