摘要
将大跨度钢桁架桥梁简化为等截面质量梁进行结构动力分析,车辆荷载假设为附加质量,通过具有附加集中质量梁的自由振动微分方程,推导了附加质量与梁固有频率变化量的关系:结构各阶次的固有频率与位置固定的附加质量成线性比例关系,其斜率数值与阶次及附加质量位置相关。通过某大跨度钢桁架桥模型采用数值及试验说明了理论关系式的正确性,并且相对桥梁质量很小的附加质量对结构频率影响明显。
The large-span steel truss bridge is simplified to beam with the same cross section,and vehicles load is seen as added masses.This paper gets formulation between added masses and changing values of the nature frequency according to vibration equation.The relationship between the added mass and structure frequency is linearly proportion.The slope value has relation with the location of added mass and frequency order.The formulation is tested by experiments and numerical simulation of a large-span steel truss bridge model;The structure frequency is visibly affected by the smaller added mass.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2012年第3期97-100,共4页
Journal of Wuhan University of Technology
基金
交通部西部交通建设科技项目(20113187801370)
江西省交通运输厅科技项目(2010H0029)
关键词
附加质量
频率
桁架桥梁
added masses
nature frequency
truss bridge
