钢桁梁斜拉桥成桥索力优化的实用算法

发布时间：2018-05-10 08:02

本文选题：钢桁梁斜拉桥 + 合理成桥状态　；参考：《铁道学报》2014年06期

【摘要】：根据影响矩阵原理对斜拉桥3种成桥状态(塔直梁平状态、塔梁弯曲能量最小状态和塔直中跨梁平状态)索力进行计算。分析表明,塔直中跨梁平状态能更好地在保证索力分布均匀的同时使得塔梁变形趋于最小。在塔直中跨梁平状态的基础上,本文提出一种简单实用的成桥索力优化新算法,该算法可避免常规计算时大型单元内力矩阵的计算和提取,无需编程。利用该算法对某铁路钢桁梁斜拉桥进行分析计算,通过与设计成桥索力的比较,证明计算结果的准确性;同时,基于对称原则将索力求解模型进一步简化后,有限元分析时可省略主塔建模过程,仅以主梁、拉索为分析对象便可快速得到一组准确可靠的对称索力。实桥验算结果表明,当拉索布置关于主塔对称时,对于钢箱梁斜拉桥该算法也具有很好的适用性。
[Abstract]:According to the principle of influence matrix, the cable forces of cable-stayed bridge in three kinds of bridge states (the state of tower straight beam, the state of minimum bending energy of tower beam and the state of horizontal state of tower straight mid-span beam) are calculated. The analysis shows that the flat state of the straight span beam of the tower can ensure the uniform distribution of the cable force at the same time the deformation of the tower beam tends to be minimized. This paper presents a simple and practical new algorithm for bridge cable force optimization on the basis of the horizontal state of the tower straight span beam. This algorithm can avoid the calculation and extraction of the internal force matrix of large elements in the conventional calculation without the need of programming. The algorithm is used to analyze and calculate the cable force of a railway steel truss girder cable-stayed bridge, and the accuracy of the calculation result is proved by comparing with the designed cable force, at the same time, the cable solution model is further simplified based on the symmetry principle. In finite element analysis, the modeling process of the main tower can be omitted, and a group of accurate and reliable symmetrical cable forces can be obtained quickly by using only the main beam and the cable as the analytical object. The results show that the algorithm is also suitable for cable-stayed bridges with steel box girder when the cable arrangement is symmetrical to the main tower.
【作者单位】：中南大学土木工程学院;高速铁路建造技术国家工程实验室;
【基金】：国家自然科学基金(51178471,51322808) 教育部新世纪优秀人才支持计划(NCET-12-0550)
【分类号】：U448.27

【相似文献】