大跨度预应力曲线索工字钢粱变形研究

DISPLACEMENT STUDY OF LARGE SPAN BEAM IN I-CROSS SECTION WITH PRESTRESSED CURVED STEEL TENDONS

预应力曲线索钢梁是在简支梁内设置曲线形的高强度预应力钢索而构成的，采用平衡原理和能量原理分别推导出预应力工字钢梁在预加力阶段和荷载阶段的控制微分方程，采用了编制计算程序和ANYS分析软件进行分析比较，探讨了影响工字钢梁刚度的关键因素及索的布置方式，分析结果表明，预应力对工字梁的影响十分显著，研究结果可以作为预应力工字钢梁的设计参考。

Steel girder with prestressed tendons is formed by setting curved steel tendons with high strength within girder. Steel girder with prestressed tendons can not only enhance steel girder＇s bearing capacity but also stiffness,the relative enhancement of stiffness play an important sigification to build big span steel girder. In this paper the governing differential equation for the I-steel girder during prestressing stage was derived following the equilibrium principle and the governing differential equation for the I-steel girder during loading stage was derived following the energy principle.The factors that could have effect on the stiffness of the steel girder,such as the magnitude of prestressing force,the magnitude of the loads,the height of steel girder and the mode of the tendons is discussed.The discussion results have helps to the design of steel girder with prestressed tendons.