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建立桥梁设计和既有结构评估的精确标准要求需要充分评估重载交通荷载以及重载作用导致的动态交互作用。目前的方法一般是首先计算典型的静态荷载作用,然后加上一个放大系数作为动态作用的限值。这种方法明显减少了高静态荷载和高动态扩大作用同时发生的可能性。提出了一个评估程序,只考虑临界荷载,可以有效和精确地确定典型静力(最大寿命)和动力(包括动态交互作用)荷载的特征值。采用蒙特卡罗模拟确定所选桥的临界静力荷载,建立三维有限元桥梁数据库和模型,对各种车辆荷载组合进行分析。建立识别临界荷载过程的模型,分析得到临界总荷载作用。然后可以得到临界静力荷载作用与相应的总荷载作用的相关性,进而外推确定一个特定的动力扩大系数。
Establishing precise standards for bridge design and existing structural assessment requires a thorough assessment of heavy traffic loads and the dynamic interactions resulting from heavy loads. The current method generally calculates the typical static load action first and then adds a magnification factor as the limit of the dynamic action. This method significantly reduces the likelihood of high static loads and simultaneous high dynamic expansion. An evaluation procedure is proposed that considers only the critical loads and can effectively and accurately determine the eigenvalues of typical static (maximum life) and dynamic (including dynamic interactions) loads. Monte Carlo simulation is used to determine the critical static load of the selected bridge. The 3D finite element bridge database and model are established and the load combinations of various vehicles are analyzed. Establish a model to identify the critical load process and analyze the critical total load effect. Then the correlation between the critical static load and the corresponding total load can be obtained and extrapolated to determine a specific dynamic expansion coefficient.