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一、问题的提出在周期性波浪荷载作用下海工建筑物将会发生振动,对于海中灯塔、孤立靠船墩、桥和类似的重力式水工建筑物均应研究其动力特性。尤其是结构系统的自振周期与波浪的周期相接近时,在波高不大的情况下有可能发生共振而破坏。对于开敝式码头、栈桥等建筑物,如果上部设备对变形有要求时,则也应进行动力计算,既要满足使用要求又要安全可靠。二、基本假定海上孤立建筑物在波浪作用下,严格说来是一个很复杂的问题,因此需要做某些简化假定。首先把建筑物当作具有对称平面的绝对刚体来研究。因为上述建筑物基本上是由混凝土或钢筋混凝土建成,并且其尺寸小于地基层作用区的尺寸,而弹性模量又远远大于土壤的弹性模量数。又由于建筑物的横断面相对来说是足够大的,显然这些建筑物在震动时的位移主要是由地基位移所造成。至于建筑物本身的变
I. The proposal of the problem The vibration of offshore structures will occur under cyclical wave loads. The dynamic characteristics of lighthouses, isolated piers, bridges and similar gravity-type hydraulic structures in the sea should be studied. In particular, when the period of the natural vibration of the structural system is close to the period of the wave, resonance may occur and the destruction may occur if the wave height is not high. For buildings such as open docks, trestle bridges, etc., if the upper equipment requires deformation, the power calculation should be carried out to meet the requirements of use and to be safe and reliable. Second, it is basically assumed that under the influence of waves, isolated structures on the sea are strictly speaking a very complicated issue, so some simplifying assumptions need to be made. The building was first studied as an absolute rigid body with a symmetrical plane. Because the above building is basically constructed of concrete or reinforced concrete, and its size is smaller than the size of the active area of the foundation layer, the elastic modulus is far greater than the elastic modulus of the soil. And because the cross-section of the building is relatively large, it is clear that the displacement of these buildings during the shaking is mainly caused by the ground displacement. As for the change of the building itself