论文部分内容阅读
为研究动水压力对深水高墩结构振动特性与地震响应的影响规律,以一典型深水圆形空心高墩为例,采用基于势流理论的完全数值法,建立了深水圆形空心高墩-水流固耦合数值分析模型,探讨了在墩身仅外有水、仅内有水以及内、外均有水3种情况下,桥墩结构的振动特性与地震响应的变化规律。研究结果表明:墩-水耦合作用使得桥墩结构各阶振型周期有所增大,墩身内、外均有水时增幅最大;随着水深的增大,桥墩结构的地震响应总体上是增大的,且内、外均有水时增幅最大;上部结构质量总体上降低了动水压力对结构地震响应的影响;当水深小于墩高一半时,桥墩低阶振型周期变化很小,但其高阶振型周期变化较大;高阶振型对高墩底部地震剪力贡献较大,因此,当水深不大时应当重视动水压力对高墩底部地震剪力的影响。
In order to study the influence of hydrodynamic pressure on the vibration characteristics and seismic response of deep water high pier structure, taking a typical deep hollow circular hollow piers as an example, a complete numerical method based on potential flow theory is used to establish a deep hollow circular hollow piers - Fluid-solid coupling numerical analysis model, the variation regularity of the vibration characteristics and seismic response of the pier structure is discussed under the condition that the pier body has only water outside, only water inside and water inside and outside. The results show that the coupling between the pier and water leads to the increase of the vibration modes of the piers, and the maximum increase of the piers when there is water in the piers. As the depth of water increases, the seismic response of the piers is generally increased , And the water content increases with the increase of water content. The superstructure quality generally reduces the influence of hydrodynamic pressure on the seismic response of the structure. When the water depth is less than half of the pier height, the periodic variation of the low-order mode shapes of bridge piers is small, High-order vibration modes vary greatly. High-order vibration modes contribute a lot to the seismic shear force at the bottom of high piers. Therefore, when the water depth is not large, the influence of hydrodynamic pressure on the seismic shear force at the bottom of high piers should be emphasized.