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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.
In the quasi-dynamic experiments, the unconditionally stable numerical integration method α method is adopted, and the substructure technique is adopted at the same time: (1) The stability problem of the numerical integration method for the quasi-dynamic experiments with large rigidity and many degrees of freedom is solved; (2) The limitation of experimental facility scale on large-scale structures was solved. The experiment was carried out using the three-layer structure model as an example. The unconditionally stable implicit α method and conditionally stable explicit prediction and correction Newmark method (PCM-Newmark) were used. Experimental results show that the pseudo-dynamic experiments of implicit α-methods are superior to explicit methods in accuracy. In addition, numerical iterative approximation methods are used in experimental control software, and no special requirements are required for existing experimental equipment.