基于时域分析法的装配式结构减震设计与分析

Seismic Reduction Design andAnalysis of Assembled Structure Using Time Domain Analysis Method

装配式混凝土结构因预制构件后浇连接部位容易发生脆性破坏以及施工质量难以保证,致使其整体抗震承载力低于现浇结构。由附加了黏弹性阻尼器的结构振动分析模型转化为结构控制系统,基于时域分析法进行减震设计,让各层的附加刚度能与结构原有刚度共同作用,将各层位移限制在规定破坏的范围内,而各层附加的阻尼能协同结构原有阻尼促使结构各层动力响应都达到临界阻尼状态。经过仿真分析,由时域分析法确定的各层附加刚度和附加阻尼系数可达到对输入的设定值能快速反应和对输入或产生的扰动能快速稳定的结构减震设计的目标,计算明确可靠,减震效果明显。

The seismic bearing capacity of the prefabricated concrete structure is lower than the cast-in-place structure because of the brittle failure state in post-pouring joint and the uncontrollable construction quality.Structural control system,transformed from the structural vibration analysis model added with viscoelastic dampers,was applied to the seismic reduction design using the time domain analysis method,and the added stiffness in each layer with the stiffness of structure itself can work together to limit the displacement of each layer within the scope of the provisions of destruction,the added damping cooperated with the own of the structure can prompt the dynamic response of each layer to the state of critical damping.The result of simulation analysis has shown that the goal of seismic reduction design for assembled structure can be achieved based on the time domain analysis method,which the added stiffness and added damping coefficient of each layer can make the input value responded rapidly and the input disturbance or the one caused by structure itself stabilized quickly.And the calculation is clear and reliable,the damping effect is obvious.