桥梁动水压力附加质量计算模块开发与应用

发布时间：2019-06-20 21:49

【摘要】：为解决深水桥梁动水压力附加质量表达式繁冗并涉及特殊函数,不利于实际工程应用的问题,在已有的Morsion方程法、简化辐射波浪法、基于频率降低率的附加质量比法的计算理论基础上,采用APDL语言在ANSYS中设计、开发附加质量模块,实现了附加质量的自动计算和动水压力荷载的自动添加。应用这3种附加质量理论所开发的计算模块,建立不同形式墩-水耦合简化模型,与计算精度较好的流体声单元法进行对比,比较计算精度上的差异。计算结果表明,对于截面尺寸相对细长型的桥墩,4种方法计算结果较接近;随着桥墩直径的增大、墩高减小,Morison方程法的计算结果与其它3种方法的差异增大,总体上看4种计算方法基本能反映桥墩在水中的振动响应。在实桥上应用,结果表明开发的附加质量模块具有较高的精度和较高的计算效率。
[Abstract]:In order to solve the problem that the expression of additional mass of dynamic water pressure of deep water bridge is cumbersome and involves special function, which is not conducive to practical engineering application, based on the calculation theory of existing Morsion equation method, simplified radiation wave method and additional mass ratio method based on frequency reduction rate, APDL language is used to design and develop additional mass module in APDL, which realizes the automatic calculation of additional mass and the automatic addition of dynamic water pressure load. Based on the calculation modules developed by these three additional mass theories, different forms of pier-water coupling simplified models are established, which are compared with the fluid acoustic element method with better calculation accuracy, and the differences in calculation accuracy are compared. The calculation results show that for the pier with relatively slender section size, the calculation results of the four methods are close to each other, and with the increase of the pier diameter, the pier height decreases, and the difference between the calculation results of the Morison equation method and the other three methods increases. On the whole, the four calculation methods can basically reflect the vibration response of the pier in water. The results show that the additional mass module has high accuracy and high computational efficiency.
【作者单位】：西南交通大学土木工程学院;抗震工程技术四川省重点实验室;苏交科集团股份有限公司;
【基金】：国家自然科学基金(51478390,51678491)
【分类号】：U442.55

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