【摘要】 本文通过对27m和30m预应力混凝土简支梁桥进行的动载试验,探讨了桥梁动力特性的分析方法,运用随机振动理论及数理系计原理,以随机量的数字特征(标准差)为参数定义了冲击系数.在试验的基础上,建立了车辆与桥梁相互作用的力学模型,应用数值分析的方法研究了车辆行驶速度、桥面平整度与车重对冲击系数的影响,计算结果与实测结果比较吻合.更多还原

【Abstract】 Through the moving Ioad test of two simply supported prestressed concrete girder bridges with spans of 27m and 30m respectively, the method for analysing the dynamic characteristics of bridges is studied in this paper. The impact coefficient of bridgs is defined by numerical characteristics of random variable-according to the random vibration and mathematical statistics theory. On the basis of experimental results,a numerical model of the interaction of bridge and vehicle is set up, and a numerical analysis method is used to study the effects of the velocity of the vehicle, the road surface roughness of the bridge and the vehicle weight on the impact coefficient of highway bridge. Theoretical results are in good agreement with the field measurements.更多还原