CAJ | 학술논문

把桥梁和车辆看作车桥耦合振动体系的两个分离子系统,基于ANSYS软件建立了3种车辆和桥梁的有限元模型.考虑桥面不平度影响,以车轮与桥梁接触点的位移作为协调条件,采用分离迭代算法计算了车桥耦合系统的动力响应.采用快速傅立叶逆变换的方法,应用三角级数叠加模拟了5种等级的桥面不平度及其速度项.通过对一简支梁桥车桥耦合振动的数值模拟,研究了车辆模型、桥面状况和车速对桥梁冲击效应的影响.结果表明:不同车辆模型对桥梁的冲击效应差别很大,桥面不平度对冲击效应的影响较车速大,桥梁的位移冲击效应大于内力冲击效应.因此,设计分析时宜采用能充分模拟车辆特性的复杂模型,移动荷载冲击系数取值建议以位移冲击系数为基准.
파교량화차량간작차교우합진동체계적량개분리자계통,기우ANSYS연건건립료3충차량화교량적유한원모형.고필교면불평도영향,이차륜여교량접촉점적위이작위협조조건,채용분리질대산법계산료차교우합계통적동력향응.채용쾌속부립협역변환적방법,응용삼각급수첩가모의료5충등급적교면불평도급기속도항.통과대일간지량교차교우합진동적수치모의,연구료차량모형、교면상황화차속대교량충격효응적영향.결과표명:불동차량모형대교량적충격효응차별흔대,교면불평도대충격효응적영향교차속대,교량적위이충격효응대우내력충격효응.인차,설계분석시의채용능충분모의차량특성적복잡모형,이동하재충격계수취치건의이위이충격계수위기준.
The bridge and vehicle were treated as two separated sub-systems,the FEM model of three vehiclebridge vibrations were established based on ANSYS software.The dymmic response of vehicle-bridge coupled vibration system was solved by separated itemtive algorithm in consideration of the deck roughness and compatibility conditions of the contact points.The fast inverse Fourier transform and trigonometric series iteration were used to generate 5 gades of deck roughness and their derivative velocity terms.The vehicle-bridge coupled vibration of a simple supported beam bridge was simulated numerically to find out the influence of vehicle model,road roughness and the velocity of moving vehicle on the impact effect of bridge.The result indicates that(1) the impact effects of bridge with variant vehicle models differ greatly;(2)the influence of road roughness is more significant than that of the velocity of moving vehicle,and the displacement impact effect is larger than the internal force impact effect.This study illustrates that complicated model that can describe the dynamic characteristic of vehicle should be used and the displacement impact factor is prooesed to be used as moving load impact factor in the design and assessment of bridge.