三线铁路预应力连续梁桥列车-桥梁时变系统空间振动分析.pdfVIP

第39卷第2期 中南大学学报(自然科学版) 、，0I_39 NO．2 2008年4月 J．Cent．South Univ．(Science and Technology) Apr．2008 三线铁路预应力连续梁桥 列车一桥梁时变系统空间振动分析 方淑君，李德建，曾庆元 (中南大学 土木建筑学院，湖南 长沙，410075) 摘 要：在列车一桥梁时变系统横向振动能量随机分析理论的基础上，采用26个自由度的列车空间振动模型，以 考虑箱梁翘曲影响的空间梁单元模拟桥梁结构，建立多线铁路箱梁桥列车一桥梁时变系统空间振动分析模型，分 别以构架人工蛇行波及前苏联规律性的竖向不平顺函数为横向及蛏向激振源，计算列车以不同车速通过桥梁的空 间振动响应，并对该大桥的竖向横向刚度做出评价。研究结果表明：在各种不同列车、不同行车情况下，列车走 行舒适性均在“良好”标准以上；该桥具有足够的横向(横向位移为6．36 mm)和竖向刚度(竖向位移为l31．25 mm)。 关键词：随机振动；时变系统；自振特性；预应力混凝土连续梁桥 中图分类号：U448．2 l 5 文献标识码：A 文章编号：1 672-7207(2008)02—0394—06 Stochastic space vibration analysis of prestressed continuous bridge time-varying system in three-track railroad FANG Shu~un，LI De-jian，ZENG Qing-yuan (School of Civil Engineering and Architecture，Central South University,Changsha 4 1 0075，China) Abstract：Based on the stochastic analysis theory of lateral vibration energy for train-bridge time-varying system，a finite element model for space vibration of the multi-track railway and the box beam bridge was presented．The vehicle was considered aS a twenty-six-freedom multi-body system and the bridge Was discretized aS beam finite elements、vitll warping effect．Witll the artificial bogie crawl wave aS lateral vibration source and the irregularity function presented by former Soviet Union researchers aS vertical vibration source．the space vibration responses were calculated when the train ran through the bridge at different speeds．After calculation，a comment for lateral and vertical stiffness of the bridge was made．Th e calculated results show that，under different conditions，the riding comfort of the train on