1.前言 多年来,有关移动荷载下桥梁反应中动力放大效应的研究,引起了人们极大的重视.整个澳大利亚乃至全世界的客流、货流运输量正在急剧增大,而路、桥的建设相对比较缓慢。因此,工程师对现有桥梁和在新桥梁设计中,精确评估车辆对其使用性的动力影响日趋重要。许多旧桥梁相对于其设计流量正在超量运行,新的桥梁必须设计得具有足够的强度,使之能承受最大的期望荷载而不产生过大的挠度。 1. Introduction For many years, the research on the dynamic amplification effect of the bridge response under moving loads has drawn great attention. The flow of passenger and freight traffic across Australia and even the world is rapidly increasing, and the construction of roads and bridges Relatively slow. As a result, engineers increasingly appreciate the dynamic impact of vehicles on their usability in existing bridges and in new bridge designs. Many old bridges are over-running relative to their design flow, and new bridges must be designed with sufficient strength to withstand the maximum expected load without excessive deflection.