基于振动台的RTDHT试验及其在双层刚架结构上的应用

REAL-TIME DYNAMIC HYBRID TESTING BASED ON SHAKING-TABLE AND ITS APPLICATION TO A TWO STOREY RIGID FRAME

实时耦联动力试验(RTDHT)是一种将物理模型试验与数值求解计算实时耦联在一起的新型结构动力试验方法。该文基于振动台构建了振动台型RTDHT试验系统,并对其动力特性进行了研究。利用所构建的RTDHT试验系统,研究了一个双层刚架结构的自振特性及动力反应,其中上层框架为物理子结构,而下层框架为数值子结构,通过两部分之间的实时数据交互得到整体结构的动力响应。将双层刚架的RTDHT试验结果与CDM数值计算结果进行了对比,结果表明二者吻合较好,基于该试验系统的RTDHT试验具有较高的精度。

Real-time dynamic hybrid testing （RTDHT） is a novel testing method coupled of physical substructure testing and numerical substructure calculation. In this paper, a RTDHT testing system based on shaking-table is developed and its dynamic response properties are analyzed. The testing system was applied to a two storey rigid frame to test its vibration properties and seismic responses. A specimen containing only the first storey was made, while the behavior of the second storey will be simulated numerically. The whole structure responses were obtained through alternating of the two parts in real time. Testing results by the developed RTDHT testing system were compared with exact results by CDM numerical calculation. It was found that the two methods yield almost identical results. It can therefore be concluded that the structure responses can be obtained precisely by the developed RTDHT testing system.