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- 2018
多维地震作用下大跨空间结构的减震控制分析
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Abstract:
考虑到多维地震输入对网架结构的不利影响，基于形状记忆合金超弹性，研制出一种兼具自复位、高耗能及放大功能于一体的形状记忆合金复合黏滞阻尼器（Hybrid Shape Memory Alloy Viscous Dampers，简称HSMAVD），并通过试验研究该阻尼器在循环荷载作用下的力学性能；然后以平面四角锥网架模型为基础，将该阻尼器替换部分网架结构杆件，并分析该阻尼器减震控制效果。结果表明形状记忆合金与黏滞阻尼器复合后具有良好的协同工作能力，可有效发挥形状记忆合金的超弹性和黏滞阻尼器的速度相关特性，使其具有稳定的滞回性能和良好的耗能能力；采用阻尼杆件替换原杆件的方法既能对结构进行有效的减震控制，又不改变原有的结构形式，是一种优越的减震控制方法，并为HSMAVD被动控制系统在结构抗震中的实际应用提供新思路。
Considering the adverse effect of a multidimensional seismic input on the grid structure, this study proposes an innovative hybrid shape memory alloy viscous damper (HSMAVD) with a large energy dissipation, an amplifying function, and a self-centering capability based on the superelasticity of the shape memory alloy (SMA). Cyclic tension-compression tests on the HSMAVD are performed herein to obtain the mechanical behavior of the damper. A constitutive model suitable for the damper is proposed according to the Kelvin-Voigt model. The corresponding simulation program is compiled by MATLAB and compared with the experimental results. Some members of the grid structure are then replaced by the proposed damper based on the plane quadrangular-pyramid grid model. Subsequently, the vibration control effect of the damper is analyzed. The results show that the SMA and the viscous damper have a good ability to work together and can effectively make use of the hyperelasticity of the SMA and the velocity dependency of the viscous damper. Both have a stable hysteretic behavior and a good energy dissipation capacity. The simulation results are also in good agreement with the experimental data, and the correctness of the proposed model is verified. The method of replacing an original member with a damping member is not only effective in the seismic control of the structure, but also does not change the original structure. As a superior damping control method, it can provide some new ideas for the actual application of the HSMAVD passive control system in the seismic design of a structure.
