CAJ | 학술논문

目前高架轨道是城市轨道交通的主要结构型式之一，为分析其结构振动特性，通过建立高架轨道垂向振动解析梁模型和有限元模型，采用动柔度法计算高架桥速度导纳和轨道速度导纳，并分别考虑桥梁支座刚度、桥梁截面形状对高架桥振动的影响以及高架桥基础和扣件刚度对轨道结构振动的影响。结果表明，桥梁支座刚度和截面形状在低频段对高架桥的振动有较大的影响，在高频段影响较小；高架桥结构对轨道的振动在20 Hz以下有明显的影响，在20 Hz以上基本没有影响；提高扣件刚度有利于减小轨道的竖向振动，但同时增大了轨道的固有频率。
목전고가궤도시성시궤도교통적주요결구형식지일，위분석기결구진동특성，통과건립고가궤도수향진동해석량모형화유한원모형，채용동유도법계산고가교속도도납화궤도속도도납，병분별고필교량지좌강도、교량절면형상대고가교진동적영향이급고가교기출화구건강도대궤도결구진동적영향。결과표명，교량지좌강도화절면형상재저빈단대고가교적진동유교대적영향，재고빈단영향교소；고가교결구대궤도적진동재20 Hz이하유명현적영향，재20 Hz이상기본몰유영향；제고구건강도유리우감소궤도적수향진동，단동시증대료궤도적고유빈솔。
At present,the elevated rail is one of the main structure forms in urban rail transit. In order to analyze the structure’s vibration characteristics,this paper,through establishing the viaduct vertical vibration model of analytical beam and finite element model and by using the dynamic compliance method to calculate the viaduct velocity admittance and orbital velocity admittance,studies the influence of bearing stiffness and the bridge cross section shape on the viaduct bridge vibration. Meanwhile,it probes into the influence of the viaduct foun-dation and fastener stiffness on track structure vibration. Results show that,at low frequency,the bearing stiff-ness and cross section shape have a larger effect on the viaduct vibration,while at high frequency,it has little in-fluence;Under 20 Hz,viaduct structure on the vibration of the rail has obvious effects,and it has no effect when above 20 Hz . This paper concludes increasing the stiffness of fastener is beneficial for reducing the vertical vi-bration of the rail,but may increase the natural frequency of the orbit at the same time.