Dynamic Response and Dynamic Buckling of Complex Shells with Random Imperfections

具有随机缺陷的复杂壳体的动态响应和动态屈曲

• 批准号: 8516915
• 负责人: Adriene Jefferson
• 金额: $ 10.62万
• 依托单位: Purdue Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1986
• 资助国家: 美国
• 起止时间: 1986-01-01 至 1989-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8516915&HistoricalAwards=false
• 关键词: Dynamic; Response; Buckling; Complex; Shells

Thin-shell structures are widely used for cooling towers, chimneys, storage tanks, pressure vessels, domes and hangers. However, geometrical imperfection of such construction can greatly influence the buckling and vibrational behaviors, particularly during the earthquake conditions. Theoretical methods are developed in this project to study the non-linear dynamic response behavior of thin-shell structures in the presence of random initial imperfections which are represented as zero-mean, Gaussian, homogeneous random processes. The resulting random responses are geometrically non-linear depending upon the magnitude of the load and the root-mean-square value of the initial imperfections. The effect of imperfection parameters are studied to set the tolerance limit for these parameters.

薄壳结构广泛应用于冷却塔、烟囱、储罐、压力容器、圆顶和吊架。然而，这种结构的几何缺陷会极大地影响其屈曲和振动行为，特别是在地震条件下。本项目开发了理论方法来研究薄壳结构在随机初始缺陷存在下的非线性动态响应行为，随机初始缺陷表示为零均值，高斯，均匀随机过程。由此产生的随机响应在几何上是非线性的，这取决于载荷的大小和初始缺陷的均方根值。研究了缺陷参数的影响，确定了缺陷参数的公差极限。