【摘要】 对渡槽结构横向流-固耦合动力特性及其幅频响应特性进行了较为详尽的分析,分析表明:①结构体系存在二个横向振动固有振动频率ω1、ω2,当系统以较小的频率ω1(同相位频率)振动时,结构振动的方向与流体的晃动方向一致;当系统以较大的频率ω2(异相位频率)振动时,结构振动的方向与流体的晃动方向相反。②当外动力荷载的频率(或卓越频率)与ω1(或ω2)接近时,结构体系会发生共振反应,流体对结构振动会产生放大效应。③渡槽结构体系还存在一个特殊的振动频率ω3,当外动力荷载的频率(或卓越频率)与ω3接近时,晃动的流体对结构起到减振的作用。④渡槽内的流体质量可以分为固定质量与晃动质量两部分,其中固定质量会加大结构顶端的动力惯性反应,可能会对结构安全构成不利影响。更多还原

【Abstract】 The transverse dynamic characteristics and frequency-amplitude response properties of an aqueduct system with fluid-structure interaction was analyzed in details.The results showed that: 1.the fluid-structure coupled system has two transverse fundamental frequencies ω1 and ω2;with the lower frequency ω1,the structure and fluid of the system vibrate in the same phase angle,and with the higher frequency ω2.the structure and fluid of the system vibrate in the inverse phase angle;2 when the frequency(or predominant frequency) of the external excitation is close to ω1(or ω2),the system resonates;the fluid has an amplification effect on the structural vibration;3.the fluid-structure coupled system has a special frequency ω3;when the frequency(or predominant frequency) of the excitation is close to ω3,the sloshing fluid has a reduction effect on the structural vibration;4.the fluid mass in the aqueduct can be divided into a fixed mass and a sloshing mass;the fixed mass adds the structural inertia response at the top,it may be harmful to the structural safety.更多还原