基于人工鱼群算法的位移型阻尼器位置和参数的优化方法

摘要

In an energy dissipation structure,the seismic mitigation effect of dampers is depended on their parameters and placements.An optimized model based on artificial fish swarm algorithm,was proposed for the optimal design of displacement-based dampers.The model can be applied in structural finite element models with multi dimensions and degrees of freedom to determinate the placements and parameters of displacement-based dampers in each story.In order to deal with the increment of story shear force after installing displacement-based dampers,an optimized objective function was proposed,in which the variation of maximum story-drift angle,story acceleration and story shear force was considered,and the form of root mean square (rms)was adopted to reflect the vibration properties of each story's responses in the process of earthquake wave excitation more effectively.In the optimal design process of the energy dissipation structure,the weighting coefficients of the objective function can be flexibly adjusted according to the design demands.Some examples were illustrated to verify the effectiveness of the new mathematic model.%对耗能减震结构中，阻尼器参数和位置决定着结构的减震效果。基于人工鱼群算法提出一种针对位移型阻尼器优化设计的人工鱼群优化模型，模型面向以有限元模型表示的多维多自由度实际结构，对各层位移型阻尼器的位置和参数进行优化。针对结构中添加位移型阻尼器会使结构层剪力增大的问题，提出一种同时考虑结构各楼层层间位移角、各楼层加速度和层剪力变化的优化目标函数，同时利用均方根的形式更加有效的反应各响应在地震波峰值段的变化特性。结构减震控制优化设计时可根据结构的不同设计需求修正目标函数的加权系数。最后，通过数值算例验证本文优化模型的有效性。