摘要
以新建沪昆高铁上跨武广客专某槽型断面独塔转体施工斜拉桥为工程实例,分别采用Midas/Civil和Ansys有限元程序建立整体和局部分析模型,模拟分析塔梁墩固结区应力的分布特征;探讨应力集中点附近区域的应力分布情况,明确其影响范围;沿指定路径追踪截面上的应力,揭示其分布规律。研究结果表明:槽型梁底板上下缘拉应力较大,需局部加强;塔柱边边缘、塔梁相交处及固结区内部孔洞附近存在应力集中现象,应适当设置圆倒角;最大压应力点附近区域应力迅速衰减,影响范围较小,最大拉应力点附近区域一定范围内存在较大的拉应力。
Taking a U - shape section cable - stayed bridge with single - tower on the Kunming--Shanghai pas- senger dedicated line across Wuhan - Guangzhou high - speed railway as an engineering example, whole calcula- tional model and local analysis model were established by means of finite element software Midas/civil and Ansys separately to simulate and analyze distribution characteristics of stress of Pier - Tower - Girder fixed region. Stress distribution near the stress concentration points was researched so as to make the impact area clear. To track stress on cross - section along the specified path, distribution rule of stress was shown. The results indicate that tensile stress at the edge of base plate of U - shaped beam is comparatively large and local reinforcement is required. Stress concentration phenom exists on the edge of tower, the intersection of tower and beam as well as the internal holes in fixed region, thus circular chamfering should be set appropriately. Stress decreases rapidly near the maximum compressive stress points, and the sphere of influence is comparatively small, while stress is comparatively large near the maximum tensile stress points.
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2013年第4期35-40,共6页
Journal of Railway Science and Engineering
基金
铁道部科技研究开发计划项目(2010G018-A-3)
关键词
桥梁工程
局部分析
数值模拟
槽型梁
斜拉桥
应力集中
bridge engineering
local analysis
numerical simulation
U - shaped beam
cable - stayed bridge
stress concentration
