PDEM-BASED STOCHASTIC RESPONSE ANALYSIS OF WIND-EXCITED STRUCTURES
The recently developed probability density evolution method (PDEM) is introduced to study stochastic response of wind-excited structures. In the method, a completely uncoupled one-dimensional governing partial differential equation is derived first with regard to evolutionary probability density function of the stochastic response of structures. Utilizing the orthogonal expansion method, a very efficient procedure for simulation of wind field velocity processes is developed in the paper. The procedure starts by decomposing the wind field velocity into a product of the stochastic process and the random field, which represent the time property and the spatial correlation property of wind velocity fluctuations, respectively. The stochastic process for wind velocity fluctuations may be represented as a finite sum of deterministic time functions with corresponding uncorrelated random coefficients by the orthogonal expansion. Similarly, the random field can be expressed as a combination form with only a few random variables by the Karhunen-Loeve decomposition. Therefore, it is natural to combine the PDEM and the orthogonal expansion model of wind field velocity to study the stochastic response of structures. An example, of which deals with a tall building subjected to wind loads, is investigated to validate the above approach.
Probability Density Evolution Method (PDEM) Wind velocity fluctuation Structural dynamics Stochastic process Orthogonal expansion
Zhang-Jun Liu Jie Li
College of Civil & Hydroelectric Engineering, China Three Gorges University,Yichang 443002, P.R. Chi School of Civil Engineering, Tongji University, Shanghai 200092, P.R. China
国际会议
第十届国际结构工程青年学者研讨会(The Tenth International Symposium on Structural Engineering for Young Experts)
长沙
英文
141-147
2008-10-19（万方平台首次上网日期，不代表论文的发表时间）