地震作用下动水压力对深水桥墩的影响

采用Morison方程、Westergarrd方程、流固耦合分析动水压力对桥墩的影响。研究发现:随着水深的增加地震响应会增大;流固耦合理论计算得到的结果小于附加质量法得到的结果;当相对水深较小时,Morison方程计算结果偏于保守,相对水深增大,Westergarrd方程计算结果更加保守,且随着水深增大,响应增大较快;水深对墩底弯矩的影响小于对墩底剪力的影响。

Seismic response comparison of hydrodynamic pressure on bridge pier in deep water

Morison equation,Wetergarrd equation and fluid-structure interaction theory are used to analyze the influence of hydrodynamic pressure on bridge pier and to compare the differences of the three methods in seismic response. Research finds that hydrodynamic pressure reduces the natural frequency of structure while seismic response increases in deeper water, so the results calculated by fluid-structure interaction is less than the result of the added mass method; Morison equation gets the more conservative results at smaller relative depth while Westergarrd equation calculation results are more conservative and while the relative depth increases, response increases faster in deeper water; impaction on bottom shear generated by water depth is greater than the impaction on bottom bending moment.