多维减振阻尼器力学性能研究

大跨空间结构由于结构布局的多维性和所受荷载的多维性，其结构响应具有明显的多维特征。对于单层网格形式的大跨空间结构，其结构构件通常受“弯矩-轴力”多维内力组合作用，与桁架形式的大跨空间结构中仅受轴力的杆件有很大区别。为此提出了一种适用于大跨空间结构的多维减振阻尼器，其具有同时提供轴向、弯曲等多维刚度和减振效果的特征。针对该阻尼器力学性能进行分析，推导了阻尼器的多维刚度公式。采用MATLAB编制程序求解理论公式，并与ABAQUS仿真结果进行了对比。对其静力性能进行验证，并探讨了多维减振阻尼器的动力耗能能力以及在大跨空间结构中的减振效果。研究结果表明：多维减振阻尼器在受静力作用时具有轴向、弯曲等多维刚度，从而减少因替换杆件对结构造成的削弱；在动力荷载作用下，耗能性能良好，可以为大跨空间结构提供有效多维减振；采用多维减振阻尼器替换杆件后，结构节点的竖向位移峰值降幅达43.3%，竖向加速度峰值降幅47.1%。

Research on mechanical properties of multi-dimensional vibration control damper

Due to the multi-dimensional nature of the structural layout and the load applied to the structure, the response of large span spatial structures is also multi-dimensional. Unlike a truss structure, a single-layer reticulated large-span spatial structure is usually subjected to a multi-dimensional internal force combination. In this paper, a new type of multi-dimensional vibration control damper,which can provide the multi-dimensional stiffness for large span spatial structures, was presented. Through the analysis of the mechanical properties of the damper, a multi-dimensional stiffness formula of the damper was deduced. The theoretical formula program was written using MATLAB, the result of which was compared with the simulation results from ABAQUS. The static performance of the multi-dimensional damper was verified, and the energy dissipation capacity of the multi-dimensional damper and the effect of vibration reduction were discussed. The results show that the multi-dimensional vibration control damper can provide the multi-dimensional stiffness when subjected to static force, thus reducing the weakening of the structure caused by replacement of bars. Under the dynamic action, the damper can provide effective multi-dimensional vibration reduction for the large span spatial structure. After replacing the bar with a multi-dimensional vibration control damper, the peak value of vertical displacement of the structural node is decreased by 43.3%, and the vertical acceleration peak point of the structural node is decreased by 47.1%.