Evaluation of Damage in Steel Tanks Due to Hurricanes

9907440用数值方法研究了强风作用下薄壁钢圆罐的屈曲损伤。这些坦克是过去十年美国加勒比海群岛和波多黎各飓风期间失败的圆柱形坦克的代表，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屿上发现的坦克目录，以及在重大飓风后检测到的损坏情况。一些失效的储罐是短的，径厚比为1900，高径比为5。将采用几种模型来模拟壳体的响应和失稳，包括线性基本平衡路径的分叉屈曲，缺陷储罐的非线性静力分析，以及非线性动力响应。风的作用将使用在圆周方向上的几个气压分布和不同的阵风持续时间来模拟。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机制，以便与观察到的损坏和发现的故障进行比较和验证。没有失败的坦克也将被用来校准模型。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.