车辆荷载作用下简支梁桥振动的研究

Research on Simply Supported Beam Bridge Vibration Due to Vehicular Loads

本文应用数值分析的方法研究在移动的两轴车辆荷载作用下简支梁桥的动力响应。分析了车辆初始振动、车辆行驶速度、桥面不平整等参数对桥梁动态增量(Dynamic Increment)的影响,研究了简支梁桥不同截面的动态增量,提出了简支梁桥的放大谱,最后对山东胜利大桥的引桥进行了动载试验,实测结果与理论分析结果相当吻合。

The paper deals with the dynamic response of simply supported beam bridge under two-axle vehicular loads by numerical method. The effects of such factors as vehicle＇s initial oscillation, vehicle＇s moving speed, roughness of bridge surface upon the dynamic increments of bridge are analyzed. The dynamic increments among different cross-sections in simply supported beam bridge are discussed. Based on analyses the amplification spectrum for simply supportedbeam bridges is also presented. Finally, a field test on a 30 meter-span prestressed concrete simply supported box girder bridge, the approach of Victory Bridge in Sandong province, has been carried out. The results from the field test coincide very closely with that from theoretical analysis.