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广泛应用于装配结构中的螺栓连接会对整个结构的动力响应产生显著的影响,可见,研究这类连接部位的动力学行为具有重要的意义。该文对描述此类连接形式的动力学行为的Iwan模型进行了深入的研究。首先推导了当构成模型的Jenkins单元的屈服力满足均匀分布的情况下,Iwan模型分别处于局部滑移和整体滑移运动时的描述模型恢复力的分段非线性函数,并对其进行了归一化处理;接着在其基础上,推导了在这两类滑移运动中,模型周期能量耗散的归一化计算公式;最后还进一步对修正Iwan模型进行了研究。研究成果为研究装配结构的结构阻尼和非线性动力学行为奠定了基础。
The widely used bolt connections in the assembly structure will have a significant impact on the dynamic response of the entire structure. Therefore, it is of great significance to study the dynamic behavior of such joints. In this paper, Iwan model, which describes the dynamic behavior of this kind of connection, is studied deeply. Firstly, the piecewise nonlinear function describing the restoring force of the model when the Iwan model is in local slip and global slip respectively is derived when the yielding force of the Jenkins unit that constitutes the model satisfies the uniform distribution. On the basis of this, the normalized formula of the energy dissipation of the model cycles in these two types of slipping motions is deduced. Finally, the modified Iwan model is further studied. The research results lay the foundation for studying the structural damping and nonlinear dynamic behavior of the assembly structure.