高速铁路系统实时混合试验中列车运行速度快，需要建立足够长的桥，且必须采用精细化的车－轨－桥耦合数值模型，因此对数值计算的精度和效率都有很高的要求。同时，实时混合试验对实时性要求较高，每一步都需要在极短时间内完成，进一步增加了问题的难度。有鉴于此，文中提出了一种新型计算方法———移动荷载积分法，在试验前对桥梁数值子结构计算所需要的数据进行存储，实际计算时对每一时步对应的数据进行抽取和计算，得到当前时步的位移响应。文中还结合弹塑性数值子结构方法将该方法拓展到局部非线性情况，然后通过缩尺高速铁路振动台实时混合试验，系统地验证 了该方法的可行性与可靠性。

Since the train runs fast，it is necessary to build a long enough bridge and to adopt a sufficiently refined vehicle-track-bridge coupling mode in real-time hybrid testing of high-speed railway system． Therefore，high accuracy and efficiency of numerical computation is essential． At the same time，the real-time hybrid testing requires high instantaneity，and each step needs to be completed in a short time，which further increases the difficulty of the problem． To this end，a new computation method，named the moving load integration method，was proposed． The data needed for the numerical substructure computation of the bridge was stored before the testing． In the actual computation，the corresponding data of each time step was extracted and computed to obtain the displacement response of the current time step． The method was extended to the local nonlinear condition by means of the elastoplastic numerical substructure method，and then the feasibility and reliability of the method were systematically verified by the real-time hybrid testing of the scaled-down high speed railway shaking table．