The test and calculation results show that with prestressing not only the opening of the contraction joints is distinctly reduced, but also the natural frequency of arch dam increases in some degree.

• 试验和计算结果表明，在施加预应力之后，不仅在一定程度上减小了横缝在强震荷载下的张开度，也在一定程度上提高了非整体拱坝结构的自振频率。