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。
To bridges, the calculation formulas for the added mass of deep-water hydrodynamic pressure are redundant and involve special functions, which are considered not beneficial to the ac-tual project application. Based on the calculation theories of the existing Morsion equation, simpli-fied radiation wave method and the added mass ratio method based on frequency reduction rate, the APDL language is used to design and develop added mass modules in ANSYS, to realize the auto-mated calculation of the added mass and the automated adding of hydrodynamic loads. The calcula-tion module developed based on these three added mass theories was used to establish simplified models of the pier-water coupling of a variety of types, and the results were compared with those gained by using the fluid acoustic element method that has good calculating precision, to find the difference of the two methods in calculation precision. The results of the calculation indicate that the four methods generate results approximate to each other when used to the piers with long and slim cross sections. As the diameter of the pier increases, the pier height decreases, and the re-sults from the Morison equation have a great difference with those gained by the other three meth-ods. Generally speaking, the four calculation methods can basically reflect the vibration response of the pier in the water. The engineering practice proves that the added mass module developed owns high precision and calculating efficiency.
出处
《世界桥梁》
北大核心
2017年第4期66-73,共8页
World Bridges
基金
国家自然科学基金(51478390
51678491)
