CAJ | 학술논문

基于振型叠加原理,采用广义坐标变换的方式建立了移动荷载匀变速通过简支梁桥时系统的动力平衡微分方程并编写了分析程序.以某3×32 m铁路多跨简支箱梁桥为例,计算得到车辆匀速运行时桥梁最大挠度随车速的变化曲线,选取曲线上的代表值点进一步计算,并从车桥共振的角度详细分析了桥梁最大挠度的变化趋势以及车辆变速运行对桥梁最大挠度的影响.
기우진형첩가원리,채용엄의좌표변환적방식건립료이동하재균변속통과간지량교시계통적동력평형미분방정병편사료분석정서.이모3×32 m철로다과간지상량교위례,계산득도차량균속운행시교량최대뇨도수차속적변화곡선,선취곡선상적대표치점진일보계산,병종차교공진적각도상세분석료교량최대뇨도적변화추세이급차량변속운행대교량최대뇨도적영향.
Based on modal superposition technique, the dynamic equations of a coupled vehicle-bridge system were established with generalized coordinates and the vehicle load passing the bridge with varying speed, and a computer code was worked out. The proposed method was then applied to the analysis of a railway bridge with 3 x 32 m multi-span sim-ply-supported box-girders. The distribution curve of the bridge maximum deflection versus vehicle speed was drawn basedon the calculated data. To study the influence of the speed variation on the bridge deflection, a further calculation was performed on some selected typical points of the curve. The influences of speed - varying loads on the peak bridge deflec-tions and their varying tendency were explained in detail with the vehicle-bridge system resonance mechanism.