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重力坝通常是分缝的,按平面问题计算。如果横缝是灌浆的,或是修建在峡谷中的重力坝,实际上是一空间问题,应按空间问题计算。 即使横缝是不灌浆的,在静水压力作用下和作小振幅振动时,也表现为空间整体作用。空间作用的结果将使中间坝块受力减少,作用在坝上的力通过纵向(坝轴向)联系,传至河谷两岸,两坝肩的受力加大,一般,对坝肩的影响比对中间坝块更大。重力坝按平面形变问题计算本身已说明其是一整体,变形是以平面变形为基础,是一准空间问题。本文用分解刚度法,建立起了简化的重力坝空间振动算式,使得这一问题获得简便的解答。
Gravity dams are usually grouped, calculated as plane problems. If the transverse joints are grouted, or the gravity dam built in the gorges is actually a space problem, it should be calculated according to the space problem. Even if the transverse joint is not grouted, it also appears as an overall space function under hydrostatic pressure and with small amplitude vibrations. As a result of space effect, the stress in the middle dam will be reduced, and the forces acting on the dam will be transmitted to the banks of the valley through the longitudinal (axial direction of the dam). The stress on the two abutments will increase. Generally, The middle dam larger. Gravity dam deformation by plane deformation calculation itself has shown that it is a whole, the deformation is based on the plane deformation is a quasi-space problem. In this paper, we use the decomposition stiffness method to establish a simplified formula for spatial vibration of gravity dam, which gives a simple solution to this problem.