摘要
地震荷载作用下,深水多塔斜拉桥的桥墩水下部分与周围水体之间相互作用会导致斜拉桥受到水体运动产生的动水压力的作用。为了解动水对其地震响应的影响规律,基于Morison方程,采用附加质量法来考虑地震动水压力对桥梁水下部位的作用。以某六塔斜拉桥为研究对象,分析了动水压力对多塔斜拉桥墩身内力反应的影响,同时还探讨了在不同地震波作用下水位对多塔斜拉桥地震响应的影响。研究结果表明,地震动水压力对墩身的弯矩和剪力均有一定的影响;水位对各墩底内力的动水效应系数的影响程度与地震波的频谱特性有关;总体上,地震动水压力对各墩底内力的影响随水位的上升而增加。对于深水多塔斜拉桥的抗震设计,考虑动水压力的影响以及水位的变化是有必要的。
When deep water multi-span cable-stayed bridges are under seismic loads, the interaction between underwater structures and the surrounding water will result in hydrodynamic forces on the bridges. In order to understand the effect characteristics of hydrodynamic pressure on this bridge, on the basis of the Morison equation, this paper analyzed the effects of hydrodynamic pressure on the force of bridge pier body in detail. The effects of hydrodynamic pressure on the underwater structures of the bridge was considered with the additional mass method. A cable-stayed bridge with six towers was used as a project background. The effects of water level on the seismic responses of the multi-span cable-stayed bridge at different earthquake waves were investigated. The results show that there is a certain hydrodynamic effect on the internal force of multi-span cable-stayed bridge pier. The influence of the hydrodynamic effects with different water levels is related to the spectral characteristics of earthquake waves. In general, the hydrodynamic effect of bridge pier bottom increases with the raising of the water level. In the seismic design of deep-water multi-span bridge, it is necessary to consider the hydrodynamic pressure effects.
出处
《结构工程师》
北大核心
2016年第1期77-84,共8页
Structural Engineers
关键词
动水压力
多塔斜拉桥
Morison方程
地震响应
水位变化
hydrodynamic pressure, multi-span water level cable-stayed bridge, morison equation, seismic response,
