巨型框架多功能减振结构的有限元计算方法

巨型框架多功能减振结构的结构复杂、规模庞大,并且它是由具有不同阻尼特性的材料组成的。因此,采用有限元方法进行计算时面临着一系列问题需要解决。针对巨型框架多功能减振结构的受力特性,给出了巨型框架多功能减振结构的三维简化计算模型,大大缩减了计算自由度。由于隔震橡胶垫的变形主要是水平剪切变形,因此,将隔震橡胶垫看做具有阻尼特性的三维弹性或弹塑性铰,并提出了隔震橡胶垫单元的三维单元模型。由于巨型框架多功能减振结构的非经典阻尼特性,可以采用子结构技术对巨型框架多功能减振结构进行有限元建模、计算。

FINITE ELEMENT ANALYSIS OF MULTI-FUNCTIONAL VIBRATION-ABSORPTION MEGA-FRAMES

The multifunctional vibration-absorption mega-frame structures, which are composed of parts with different damping coefficients, are complicated and large-scale systems. Problems arise when the finite element method is adopted to analyze the systems. Considering the performance of the system under dynamic loads, a simplified three-dimensional finite element model, in which the degrees of freedom are condensed, is presented. The main deformation of the laminated rubber bearings (LRBs) is the horizontal shear deformation; therefore a LRB is regarded as a three-dimensional elastic or elasto-plastic hinge with damping character and a three-dimensional finite element model of the LRB is presented. The substructure technique is adopted to analyze the multifunctional vibration-absorption mega-frame structures.