【摘要】 基于有限单元法理论,确定了斜拉桥合乎其构造特点的空间计算模型,建立了斜拉桥的自由振动的三维运动方程,对斜拉桥的动力特性进行了求解和分析;在此基础上,建立了在气动荷载作用下斜拉桥的三维运动方程,提出了用于分析斜拉桥颤振临界状态的子空间复特征值方法,推导出计算颤振临界风速的理论公式,并编写了用于计算斜拉桥颤振临界风速和颤振频率的多振型参与双参数自动搜索的计算机程序。更多还原

【Abstract】 This paper erects the space calculating model of cable stayed bridges in accordance with its construction based on the finite element method theory; establishes its 3 D space natural vibration equation; analyzes and seeks the solution of its natural characteristics. The author also erects 3 D space vibration equation of long span cable stayed bridges with the wind loading; presents a sub domain complex eigenvalue method to study the flutter and obtains the theory formula for calculating the critical wind velocity of flutter; makes up the multi mode & two parameter searching computer programm.更多还原