大跨径悬索桥结构分析理论及其专用程序系统的研究

Research on the Structural Analysis Theory and Special Program of Long Span Suspension Bridge

大跨径悬索桥是典型的柔性结构体系，其受力特性表现为几何非线性。设计阶段不仅要计算其恒、活载和附加荷载的受力与变形，还要计算主缆、吊索制作时的无应力索长，挂索初期索鞍的预偏量等特殊问题；在施工阶段要作各种施工荷载及风载作用下的受力分析。此外，悬索桥的风振、地震响应以及塔的稳定性也是设计者关心的问题。而悬索桥在各种情况下的静、动力特性及稳定性与该时刻结构状态密切相关。为了理顺这些关系，并根据拟定的成桥结构参数来完成上述各项复杂的分析，完善悬索桥的设计计算，作者在研究悬索桥结构分析理论与方法的基础上，设计了悬索桥结构分析专用程序系统。本文介绍悬索桥分析理论及其专用程序结构。

Long span suspension bridge is a typical flexible structure with geometrical nonlinearity as its mechanical feature. In the design stage, besides its internal force and deformation under the dead load and live load, the zero stress length of the main cable and suspender must also be calculated. In the construction stage, its internal force and deformation under the construction load and wind load will also be analyzed. Moreover, the wind excited and earthquake response of the suspension bridge and the stability of the tower are also interesting to designers. The static and dynamic characteristic and stability in all the situations are closely related to the structural state at that time. To sort out these relations and complete all the complicated calculations mentioned above with the planned structure parameters and to improve the disign and calculation of the suspension bridge, a special program system for the structure analysis is designed based on the study of the theories and methods of structural analysis of suspension bridge. The calculation theory and program structure are introduced in this paper.