摘要
在作用于结构的非定常力中加入脉动风速平方项,运用随机微积分理论和矩方程理论,得到结构顺风向运动的矩方程.通过累积量截断法和微分方程数值方法,分析了几种地形条件下,顺风向脉动风速平方项对结构随机响应的影响.结果表明,在某些地形条件下,脉动风速平方项对结构的影响不可忽略.
Moment equations of structure in a windward direction is obtained by introducing a (quadratic) term of gust velocity into the dynamic unsteady force acting on the structure and combining the theories of stochastic differential equation and moment equation. Under various landforms and (terrain) conditions, and taking into account the effects of the nonlinear windward gust velocity, the (random) responses of structure are analyzed by using the method of cumulant neglect and a PDE (nume-)(rical) method. It is demonstrated that effects of quadratic gust velocity is not negligible under some (special) terrain conditions.
出处
《上海大学学报（自然科学版）》
CAS
CSCD
2004年第6期630-634,共5页
Journal of Shanghai University:Natural Science Edition
基金
上海市教委高等学校科学技术发展基金资助项目 (0 2AK0 1 )
关键词
脉动风速
非线性
随机响应
矩方程
gust velocity
nonlinear
random responses
moment equation
