Study on Seismic Behavior of Concrete Structures by using Dynamic Visualization Technique

作者发明并发展了一种动态可视化技术，即通过回放计算机控制的伪动态试验中所拍摄的独立无穷小镜头录像带，将试件的非线性动态变形显示在视频屏幕上，并利用新购置的摄像机及相关仪器，提高了动态图像的质量。利用该技术进行了钢筋混凝土柱试件在不同配筋条件下的地震反应试验，得到了考虑抗震安全性和使用性能的合理配筋设计方法。本文还对两层钢筋混凝土刚架试件进行了试验研究，清晰地表达了这类结构地震破坏的动力机制，并将其记录在录像带中。本研究的成功结果对于探讨1995年神户大地震中结构的破坏机理具有重要意义。本研究中，屏幕上的动态图像由33幅独立的帧组成，每幅帧的持续时间为0.03秒，是根据地震时间序列记录的。因此，在监视器屏幕上可以观察到平滑自然的动态运动，这些动态图像被认为是几乎完美的。作者制作了有价值的录像带，可以显示不同设计的钢筋混凝土试件在强烈地震下的各种动力行为。这些视频对改进钢筋混凝土结构的抗震设计和抗震加固具有重要的参考价值。

The dynamic visualization technique was invented and developed by the authors in which nonlinear dynamic deformation of a specimen was visualized in the video screen by playing back the tape of the independent infinitesimal shots of video recording taken in the pseudo-dynamic computer controlled test.In this study, improvement the quality of dynamic pictures was performed by means of utilizing newly purchased video camera and related instruments. Seismic response of reinforced concrete column specimens in the various reinforcement condition was obtained by the experiment using above mentioned technique, and rational reinforcement design method was obtained for the seismic safety and serviceability. Two-story reinforced concrete rigid frame specimen was also tested and dynamic mechanism in the seismic failure of this type of the structures was clearly expressed and was recorded in the video tape. The successful result of this study was quits useful to investigate the failure mechanism of the structures in the Great Hanshin Earthquake of 1995.In this study, the dynamic pictures in the screen consist of 33 independent frames each of which has been recorded for 0.03 seconds duration according to the record of the earthquake time series. Therefore, smooth and natural dynamic movement can be observed in the monitor screen and these dynamic pictures were considered to be almost perfect.The authors have made valuable video tapes which can show the various dynamic behavior of reinforced concrete specimens under severe earthquakes designed differently. These video will be quite useful for the improvement of the seismic design and the seismic strengthening of the reinforced concrete structures.