大跨度斜张桥的非线性分析——天津永和斜张桥几何非线性研究

The Nonlinear Analysis' of Large Span Cable-Stayed Bridge——A GEOMETRIC NONLINEAR RESEARCH OF YONGHE CABLE-STAYED BRIDGE IN TIANJIN

对于大跨径斜张桥来说,刚性支承连续梁成桥已被公认为一个较好的方法。我们按此原则并根据二次理论,推导了空间梁单元的一次、二次几何单元刚度和抛物线型索的切线刚度,编制了“XZQNCX”程序,做了一系列线性和非线性计算。通过比较,我们发现:用一个简单的修正系数来考虑大跨度斜张桥的非线性影响是不全面的。为了提高设计和施工的精度,非线性分析不容忽视。

It has commonly been accepted that using a prestressed concrete girder of continuous spans, rigidly supported to from a bridge is a better means for laoge span cable-stayed bridge. According to this principle and using second order theory, formulation of the first order and second order geometric stiffness of the space beam elements and the tangent stiffness of the parabolic cable elements already obtained, and developed the "XZ QNCX" programs, which was used to check a series linear and nonlinear calculation. Through comparison, We found that is deficiency to use a single coefficient of modification. And in order to improve the design and construction accuracy, nonlinear analysis can not be ignored.