摘要
为探究中低速磁悬浮U形简支梁竖向刚度限值,基于多体系统动力学理论与有限元方法构建车-轨-桥耦合数值模型。以25、30 m两种标准跨距U形混凝土梁,建立中低速磁悬浮车桥耦合系统,研究不同梁高(1.3~1.7 m)和跨距对车桥系统动力响应的影响规律。结果表明:降低梁高会导致系统竖向位移响应与加速度指标增长,其中25 m跨距梁高1.4 m时悬浮间隙波动幅值达到12 mm临界阈值,30 m跨距梁高1.3 m时仍满足悬浮稳定性要求;随着简支梁跨距的增加,桥梁竖向位移增加,竖向加速度减小,车体竖向位移随跨距增加而增大,平稳性指标随跨距增加而减小;竖向悬浮间隙的波动范围随跨距增加而减小;跨距为25、30 m的U形梁建议挠跨比限值分别为L/2 880、L/1 630。研究成果为轨道梁结构轻量化设计与刚度标准制定提供了理论支撑,对实现工程经济性与系统可靠性的协同优化具有重要指导价值。
To investigate the vertical stiffness limits of medium-low speed maglev U-shaped simply supported beams,this study constructed a vehicle-track-bridge coupled numerical model based on multibody system dynamics theory and finite element methods.Focusing on U-shaped concrete simply-supported beams with two standard spans of 25 m and 30 m under varying beam heights(ranging from 1.3 m to 1.7 m),this study analyzed the dynamic characteristics of the maglev train-bridge system.Key findings show that reducing beam height increases vertical displacement and acceleration responses of the system.For the 25 m span,the fluctuation amplitude of the levitation gap reaches the critical threshold of 12 mm at a beam height of 1.4 m,whereas the 30 m span with a beam height of 1.3 m still meets levitation stability requirements.Increasing the span of simply-supported beams leads to greater vertical displacement but reduced vertical acceleration in the bridge.The vertical displacement of the train body increases with the span,while the ride comfort index decreases with the increase of the span.The fluctuation range of vertical levitation gaps diminishes with increasing span.The recommended deflection-to-span ratio limits for U-shaped beams with 25 m and 30 m spans are L/2880 and L/1630,respectively.This research provides theoretical support for lightweight design and stiffness standardization of track beam structures,offering significantguidance for balancing engineering economy and system reliability.
作者
邹云峰
邱冰
何旭辉
周智辉
毛旺
蔡陈之
ZOU Yunfeng;QIU Bing;HE Xuhui;ZHOU Zhihui;MAO Wang;CAI Chenzhi(School of Civil Engineering,Central South University,Changsha 410075,China;Maglev Rail Transit Institute,Hunan Provincial Communications Planning,Survey&Design Institute Co.,Ltd.,Changsha 410200,China;High-speed Maglev Research Center,Hunan Rail Transit Survey and Design Co.,Ltd.,Changsha 410219,China)
出处
《铁道学报》
北大核心
2025年第7期232-242,共11页
Journal of the China Railway Society
基金
国家自然科学基金(52478574,52378546)。
关键词
中低速磁悬浮
耦合振动
轨道梁
竖向刚度
medium-low speed maglev
coupled vibration
track beam
vertical stiffness
