形状记忆合金摩擦隔振系统的非线性动力学及参数优化研究

项目名称： 形状记忆合金摩擦隔振系统的非线性动力学及参数优化研究

项目编号： No.51308195

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 张振华

作者单位： 河南理工大学

项目金额： 25万元

中文摘要： 桥梁结构抗震是桥梁工程技术领域内必须研究的重点课题。最近有研究利用伪弹性形状记忆合金(SMA)大变形自回复能力和滑动摩擦元件高耗能特点构造出SMA摩擦复合桥梁隔振器，并研究证明了水平基础激励下该隔振器的良好隔振效果。在强震作用下，桥梁结构的水平运动和垂向运动的耦合性增强，如果系统内部出现内共振等动力学现象，能量会在垂向和水平方向相互传递而难以衰减，而目前的研究没有考虑基础激励垂向分量对桥梁结构的作用，可能会对研究结果带来较大偏差。本项目拟在优化选择SMA本构模型的基础上建立水平运动和垂向运动相互耦合的SMA摩擦复合桥梁隔振系统的动力学方程,并通过该方程的动力学研究来分析垂向激励对结构动力学响应的影响。本项目拟用摄动理论发展该方程的解析法，并用奇异性理论研究该系统响应解的分岔模式及其转换条件。最后分析系统行为改变和参数变化对隔振器振动控制效果的影响，并对SMA摩擦复合隔振器进行参数优化研究。

中文关键词： 形状记忆合金；伪弹性；隔振；高架桥；地震响应控制

英文摘要： Seismic research for bridge structures is a priority subject in the bridge engineering technology field. Recently, some scholars develop a SMA-friction vibration isolator for bridge by using the self-centering ability of shape memory alloy(SMA) and high energy dissipation ability of friction element, and their research results suggest that the isolator has significant vibration isolation effect as the bridge suffering the horizontal base excitation. The coupling effect of the horizontal movement and vertical movement will be significant as the bridge under strong earthquake, meanwhile, if the system present the nonlinear dynamic phenomenon such as internal resonance, the vibration energy will transfer between the horizontal and vertical direction but no attenuation. Therefore, the fact that the effect of vertical base excitation on the bridge system is ignored as present researches will bring quite large deviation for the research results. The dynamic equation coupled with horizontal movement and vertical movement will be established based on the improved SMA model in the project, and the influences of the vertical excitation on the dynamic behaviors of the system will be investigated through the researches of the dynamic equation. The perturbation theory will be employed to solve the solutions including the int

英文关键词： shape memory alloy；pseudoelasticity；vibration isolation；viaduct；seismic control