螺栓连接梁的非线性动力学响应分析

Study on nonlinear dynamic response of bolted jointed beam

连接界面存在复杂的非线性行为和机理。连接部位是导致结构复杂非线性动力响应的关键所在。传统结构动力学分析中,通常忽略连接或采用线性化的方法来建模,造成无法分析和研究含连接结构的非线性动力行为的困难。文中在分析改进Iwan模型用于连接界面动态力学行为描述的基础上,将改进Iwan模型用于构造非线性连接元,该单元能够反映连接界面在不同载荷幅值下的复杂的粘着-滑动行为特征,能反映出幅变非线性阻尼的特征。进一步,应用该连接单元分析了螺栓连接梁的非线性动力学响应。结果表明,该连接单元能够反映出连接结构动力学响应的非线性特征,可方便地与现有有限元动力计算程序接合,用于含连接结构非线性动力学响应的分析。

Complicated nonlinear characteristic and mechanism were existed in joint interface.Jointed position is the key that can result in complicated nonlinear dynamic response.In traditional structural dynamical analysis,jointed structure unusually be ignored,or we use linear method to modeling,which cause incapable of analysis and difficult in studying of nonlinear dynamic characteristic for jointed structure.In this paper,based on the used the improved Iwan model on the description of jointed interface dynamical characteristic,we used the Iwan model to construct nonlinear jointed component which can reflect complicated adherence-glide characteristic in different loading value.Also,it can reflect nonlinear damp characteristic of amplitude variation.Nonlinear dynamic response of bolted joint beam was analysis use the joint component.The test result shown that the joint component can reflect nonlinear damp characteristic of bolted joint beam,the joint component can connect with finite dynamical calculate program,be applied into analysis nonlinear dynamic response of joint structure.