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迄今为止动力模型试验仍然是研究水坝地震反应的重要手段。本文通过安践提出一种简便易行的动力模型试验方法──直接摄影法，具有较好的实验精度。文中并相应地提出了实验成果的分析方法和材料弹模的测定方法。应用直接摄影法研究了混凝土拱坝和重力坝的振动，测出了拱坝正、反对称的各阶振型共9个，重力坝的横向振型3小和竖向振型１个．探讨了空间结构的水坝在不同方向地震作用下的反应特点，从而确定出对水坝最为不利的地震作用方向。
So far, the dynamic model test is still an important means to study the seismic response of the dam. This article puts forward a simple and easy method of dynamic model test--direct photography, with good experimental accuracy. In the paper, the analysis method of experimental results and the measurement method of material elastic model are proposed accordingly. The direct radiography method was used to study the vibration of concrete arch dams and gravity dams. A total of nine vibration modes of positive and negative anti-symmetrical arch dams were measured. The transverse vibration mode of the gravity dam was 3 small and one vertical vibration mode. The response characteristics of dams with spatial structure under different seismic directions were discussed to determine the most unfavorable seismic direction for the dam.