摘要
对悬索桥主缆求解的虚拟梁法进行了改进,证明了虚拟梁法在竖向荷载作用下主缆上的任意位置均适用,不必在吊杆处断开;推导了基于虚拟梁法的新形式相容方程,以建立主缆任意2个连续状态之间的联系;利用多点支承连续梁的求解方法,给出了加劲梁的活载挠度方程。通过建立以上非线性方程组,不仅可以求解主缆的成桥线形,而且还可以求解活载作用下悬索桥的挠度。通过算例的结果对比,说明了程序的准确性和适用性。
The fictitious beam method （FBM） for resolve the main cable of suspension bridge was improved. First, the suitability of the FBM on the whole cable under the action of vertical load was proved, so that in idealized model the cable is no longer divided by suspenders. Second, in order to relate any two continuous load states of the cable, the compatibility equation based on the FBM was derived. Third, by the analogy of multi-point supported continuous beam, the equation for live load deflection was deduced. The establishment of the above nonlinear equation is not only suited for the determination of main cable profile but also suited for the calculation of hve load deflection of suspension bridge. Comparison of the calculation examples demonstrated the accuracy and the applicability of the improved FBM.
出处
《公路交通科技》
CAS
CSCD
北大核心
2010年第1期84-88,共5页
Journal of Highway and Transportation Research and Development
关键词
桥梁工程
虚拟梁法
主缆线形
悬索桥
相容方程
bridge engineering
fictitious beam method
main cable profile
suspension bridge
compatibilityequation
