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大跨度高铁连续梁桥箱梁断面静力三分力系数的数值模拟 被引量:9
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作者 高宇琦 王浩 +3 位作者 徐梓栋 陶天友 王飞球 谢以顺 《南京工业大学学报(自然科学版)》 CAS 北大核心 2020年第3期358-365,共8页
我国高铁桥梁建设发展迅猛,其中一大批桥梁处于强台风多发区,其抗风性能备受重视,高铁桥梁的主梁断面静力三分力系数分析是其抗风研究的基础。本文基于计算流体动力学(CFD)技术,对东南沿海某大跨度高铁连续梁桥箱梁断面静力三分力系数... 我国高铁桥梁建设发展迅猛,其中一大批桥梁处于强台风多发区,其抗风性能备受重视,高铁桥梁的主梁断面静力三分力系数分析是其抗风研究的基础。本文基于计算流体动力学(CFD)技术,对东南沿海某大跨度高铁连续梁桥箱梁断面静力三分力系数开展研究,考虑不同风攻角和主梁断面尺寸对静力三分力系数的影响,并将识别结果与已有数值计算结果进行对比。结果表明:采用CFD技术可有效识别高铁连续梁桥钝体箱梁断面静力三分力系数,箱梁断面尺寸的变化对静力三分力系数影响显著。随着断面高宽比的增大,箱梁断面的阻力系数和升力系数也随之增大,而升力矩系数随之减小。研究结论可为大跨度高铁连续梁桥的抗风研究与设计提供有益参考。 展开更多
关键词 大跨度高铁连续梁桥 计算流体力学 静力三分力系数 钝体箱梁断面 抗风性能
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Applicability of small resistance fastener on long-span continuous bridges of high-speed railway 被引量:19
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作者 戴公连 刘文硕 《Journal of Central South University》 SCIE EI CAS 2013年第5期1426-1433,共8页
Ballastless tracks have been widely applied in high-speed railway (HSR). The adaptability research between continuous welded rails (CWR) and long-span bridges of HSR is of great practical engineering significance. Bas... Ballastless tracks have been widely applied in high-speed railway (HSR). The adaptability research between continuous welded rails (CWR) and long-span bridges of HSR is of great practical engineering significance. Based on the HSR long-span continuous bridges, the integrative spatial finite element model of track-bridge-pier-foundation system was established with the nonlinear spring element simulating the longitudinal resistance between track and bridge. Comparative study on the various additional longitudinal forces of CWR using the common fasteners and small resistance fasteners was carried out. Analysis results indicate that the additional expansion forces and additional rail-breaking forces in long-span ballastless continuous girders can be reduced evidently by 40% 50% after adopting small resistance fasteners, but lead to greater rail broken gap. The small resistance fasteners have little influence on the additional force only caused by vertical load, but can reduce the additional force caused by vertical load combined with braking load by over 10%. Besides, transient analysis method is proved to be more accurate and safe in calculating additional longitudinal forces when the train running or braking on the bridge, compared with the traditional static method. 展开更多
关键词 ballastless track small resistance fasteners additional longitudinal force long-span continuous beam high-speed railway
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