Evaluation of Damage in Steel Tanks Due to Hurricanes

9907440 Godoy通过数值方法研究了在强风条件下薄壁钢制圆形储罐的屈曲破坏。 这些罐是过去十年在美国加勒比群岛和波多黎各发生的飓风中失败的圆柱形罐的代表，包括飓风雨果，路易斯，玛丽莲和乔治。 这项研究将建立一个在岛上发现的坦克和在大飓风后发现的损害的目录。 一些失败的坦克是短的，半径与厚度之比为1,900，高度与半径之比为5。 将采用几种模型来模拟壳体响应和不稳定性，包括从线性基本平衡路径的分叉屈曲;不完美储罐的非线性静态分析;以及非线性动态响应。 风的作用将使用几个压力分布在圆周方向和不同的阵风持续时间建模。 将采用弹性和弹塑性本构模型。 该项目将确定每种类型储罐的主要屈曲力学，以便与观察到的损坏和故障进行比较和验证。未发生故障的储罐也将用于校准模型。 预计研究将突出设计中的不足之处，并提出改进现有设计的方法。

9907440GodoyDamage due to buckling of thin-walled, steel circular tanks under severe wind conditions is investigated by means of numerical methods. The tanks are representative of cylindrical tanks that failed during hurricanes in the last decade in the US Caribbean Islands and Puerto Rico, including hurricanes Hugo, and Luis, Marilyn and George. The research will establish a catalogue of tanks found in the islands and of damage detected after major hurricanes. Some of the tanks that failed are short, with radius to thickness ratio of 1,900 and height to radius ratio of 5. Several models will be employed to simulate the shell response and instability, including bifurcation buckling from a linear fundamental equilibrium path; non-linear static analysis of imperfect tank; and nonlinear dynamic response. Wind action will be modeled using several pressure distributions in the circumferential direction and vary gust durations. Elastic and elastro-plastic constitutive modeling will be employed. The project will identify the dominant buckling mechanics for each type of tank, so as to establish comparisons and validation with observed damage and failures found. Tanks that did not fail will also be employed to calibrate the models. It is expected that deficiencies in designs will be highlighted by the research, and ways to improve current designs will be proposed.