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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Evaluation of the adequacy of a spring-mass model in analyses of liquid sloshing in anchored storage tanks
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Evaluation of the adequacy of a spring-mass model in analyses of liquid sloshing in anchored storage tanks

机译：锚固储罐中液体晃动分析中春征模型的充分性评价

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摘要

This research addresses the influence of the load characteristics, that is, frequency content and maximum acceleration, on the wall stresses of an anchored water storage tank. A low-density polyethylene tank with a range of six different aspect ratios (water height to tank radius) was tested using a shake table. Eight sine excitations that cover the lowest free vibration frequency of the tank-water system were applied. Additionally, two sets of five Ricker wavelet excitations were utilized. Each set represents potential earthquakes with a bandwidth between a low and a high dominant frequency. The experimentally determined maximum stresses and those obtained from calculations using a common spring-mass model employed for seismic analysis of tanks were compared. The results reveal that the relationship between the excitation frequency and the wall stresses strongly depends on the sloshing behavior, especially when the frequency of loading is in the vicinity of the lowest free-vibration frequency of the tank-water system. When the frequencies are dissimilar, there is a proportional relationship between stress and the maximum acceleration of the excitation. The spring-mass model was found to underestimate both the maximum hoop stress (for aspect ratios greater than two) and axial stress (for aspect ratios equal to 0.5). This occurs because is the spring-mass model cannot capture, in all cases, the contribution of chaotic sloshing to wall stress.
机译：该研究解决了负载特性，即频率内容和最大加速度的影响，锚固储水箱的壁应力。使用摇动台测试具有六个不同纵横比（水高的水高度）的低密度聚乙烯罐。施加覆盖罐水系统最低自由振动频率的八个正弦激励。另外，使用了两组五种Ricker小波激发。每个组代表潜在地震，带宽在低位和高度的主频之间。实验确定的最大应力和使用用于坦克的抗震分析的常见弹簧质量模型获得的计算获得的最大应力。结果表明，激发频率和壁应力之间的关系强烈取决于晃动行为，尤其是当负载频率处于罐水系统的最低自由振动频率附近时。当频率不相似时，应力与激发的最大加速度之间存在比例关系。发现弹簧质量模型低估最大箍应力（对于大于两个的宽高比）和轴向应力（横向比等于0.5）。出现这种情况因为在所有情况下，弹簧质量模型不能捕获混沌晃动对壁应力的贡献。

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