【摘要】 提出了基于能量的参数优化准则,即以隔震层抗侧刚度和阻尼比为优化参数,以隔震层的应变能期望值占结构总应变能期望值的比例为目标函数,在改进的Kanai-Tajimi模型激励下,使该比例取极大值。利用上述优化准则,对一加层工程实例进行了参数优化。结果表明:目标函数受隔震层抗侧刚度的变化影响较大,受阻尼比变化影响很小;而总应变能对阻尼比变化较敏感,而对抗侧刚度的变化不敏感。因此参数优化时,可以考虑保持抗侧刚度不变,增大阻尼比而保证目标函数值变化不大,同时可以减少结构的总应变能。扫频分析表明:从应变能角度优化参数拓宽了频率控制范围,而且可以达到很好的控制效果,特别是在共振区域,各层响应较加层前均有较大的减小,同时时程分析也表明减震效果比较显著,证明了该优化方法的可行性及合理性。更多还原

【Abstract】 A new energy-based optimization criterion was proposed,namely,the lateral rigidity and damping ratio of isolation device are used as optimization variables,and the proportion of the expected value of strain energy of isolation device to the expected value of total strain energy of the structure is as the objective function,which attains its maximum value under the excitation of improved Kanai-Tajimi model.The analysis results of an adding-storey project indicate that,the objective function is influenced greatly by the lateral rigidity of isolation device,but little by the damping ratio.Whereas the expected value of strain energy of the whole building is influenced little by the lateral rigidity of isolation device,but greatly by the damping ratio.Therefore,the lateral rigidity of isolation device can be remained constant and increase the damping ratio,so that the objective function keeps almost unchanged,and the total input strain energy can be reduced accordingly.Frequency sweep analysis shows that the range of frequency control can be broadened using the proposed energy-based parameter optimization method.Response of each storey decreases more than that of the same storey prior to adding storey,especially in the resonance region.The time-history analysis also demonstrates that this method can yield satisfactory seismic reduction effects.更多还原