采用隐式积分方法和子结构技术的拟动力实验

PSEUDODYNAMIG TESTING WITH IMPLICIT TIME INTEGRATION AND SUBSTRUCTURE TECHNIQUES

在拟动力实验中采用无条件稳定的数值积分方法α方法,同时采用子结构技术:(1)解决了刚度大、自由度多的结构进行拟动力实验时数值积分方法的稳定性问题;(2)解决了实验设施规模对大型结构进行实验的限制.文中以三层结构模型为例进行了实验,采用了无条件稳定的隐式α方法和条件稳定的显式预测校正Newmark法(PCM-Newmark).实验结果表明,隐式α-方法的拟动力实验在精度上明显优于显式方法.另外,在实验控制软件中采用数值迭代逼近方法,对现有的实验设备不需要附加任何特殊的要求.

The pseudodynamic testing method presented in this paper uses the unconditionally stable implicit time integration a-method,and substructure techniques. Advantages of the method are as follows:firstly, the algorithm stability is successfully solved for the structures with large stiffness and more multi-degree-of-freedom ( MDOF ) in pseudodynamic testing. Secondly, it is free from the restriction of laboratory scale and the size of specimen. A 3-story structure model was tested with unconditionally stable a-method and conditionally stable explicit prediction-correction Newmark method ( PCM-Newmark ) .The results show that the implicit a-method is superior to the explicit method in accuracy. In addition, the present testing facilties are appropriate for the testing if the iteration approximation technique is introduced to the testing control software.