摘要
针对高速铁路下承式结合梁系杆拱桥,采用有限元方法,对混凝土板与纵、横梁结合的道碴板桥面和混凝土板与纵、横梁及系梁都结合的整体桥面2种方案进行研究.对比分析其传力途径、静力性能、动力特性和稳定性等.结果表明:在结构尺寸保持相同的情况下,整体桥面方案桥梁刚度较道碴板桥面方案的大,尤其是横向刚度;桥梁动力特性和稳定性也略优于后者.在受力上,与道碴板桥面方案相比,整体桥面方案竖向荷载在拱肋和系梁之间的分配基本相同,混凝土板和纵梁分担的纵向力则相对更大,尤其是混凝土板,增幅较明显,应力水平整体较高,系梁分担的纵向力则得到减小,横梁的受力状况整体桥面方案明显优于道碴板桥面方案,特别是在梁端处.
Using the finite element method, the ballast girder deck scheme and the integral girder deck scheme for large span through steel box tied-arch bridge in high-speed railway were studied. A comprehensive comparison was made with respect to the load transmission route, force-bearing character- istics, dynamic characteristics and stability. The results show that, with the same structure size, the integral girder deck scheme has better rigidity in particular of lateral rigidity, dynamic characteristics and stability comparing to the other scheme. The ratio of the vertical load distributed between the arch rib and the tie beam of the two schemes is the same. For the integral girder deck scheme, the longitudinal beams and the deck slab of endure more axial force compared to the ballast girder deck scheme, especially to the deck slab with a conspicuous increase of the axial force and higher stress, and the tie beam endure less. The force-bearing characteristics of the cross beams under the integral girder deck scheme is obviously better than that of the ballast girder deck scheme, especially at the two ends of each cross beam.
出处
《武汉理工大学学报（交通科学与工程版）》
2010年第1期52-56,共5页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
铁道部科技研究开发计划项目(批准号:2005k002-C-2)
关键词
高速铁路
大跨度
下承式系杆拱桥
有限元
桥面构造
high-speed railway
large span
through tied-arch bridge
finite element
bridge deckstructure
