ISO 18649:2004提供了桥梁和高架桥动态试验和调查结果的评估方法。它补充了ISO 14963中给出的试验程序，并考虑 --动态测试的目标， --数据分析和系统识别技术， --桥梁的建模，以及 --测量数据的评估。 ISO 18649:2004中考虑的动态试验不能代替静态试验。 ISO 18649:2004给出了桥梁寿命周期内测量评估指南。所考虑的生命周期阶段包括: --在施工期间和调试之前， --在试运行期间， --在桥梁整个使用寿命期间的指定时间内，以及 --在桥梁退役之前。 ISO 18649:2004适用于公路、铁路、人行天桥和高架桥（施工和运营期间），也适用于其他工程，前提是证明其适用性。 将本国际标准应用于特殊结构（斜拉桥或悬索桥）时，需要进行考虑工程特殊特性的特定试验。

ISO 18649:2004 provides methodology for the evaluation of results from dynamic tests and investigations on bridges and viaducts. It complements the procedure for conducting the tests as given in ISO 14963 and considers -- the objectives of the dynamic tests, -- the techniques for data analysis and system identification, -- the modelling of the bridge, and -- evaluation of the measured data. The dynamic tests considered in ISO 18649:2004 do not replace static tests. ISO 18649:2004 gives guidance on the assessment of measurements carried out over the life cycle of the bridge. The stages of the life cycle that are considered are -- during construction and prior to commissioning, -- during commissioning trials, -- during specified periods throughout the life of the bridge, and -- immediately prior to decommissioning the bridge. ISO 18649:2004 is applicable to road, rail and pedestrian bridges and viaducts (both during construction and operation) and also to other works, provided that they justify its application. The application of this International Standard to special structures (cable-stayed or suspension bridges) requires specific tests that take into account the particular characteristics of the work.