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

动态可视化技术是由作者发明和发展的，通过回放伪动态计算机控制试验中所拍摄的独立无穷小视频录像，在视频屏幕上显示试件的非线性动态变形。本研究利用新购置的摄像机及相关仪器，提高动态图像的质量。采用上述技术对钢筋混凝土柱试件在不同加固条件下的地震反应进行了试验，得出了合理的抗震安全性和使用寿命的配筋设计方法。对两层钢筋混凝土刚架试件进行了试验，清晰地表达了这类结构在地震破坏中的动力机理，并记录在录像带中。研究结果对探讨1995年阪神大地震中结构的破坏机制具有重要意义。在本研究中，屏幕上的动态图像由33个独立的帧组成，每个帧根据地震时间序列的记录记录0.03秒的持续时间。因此，在监视器屏幕上可以观察到流畅自然的动态运动，这些动态图像被认为是近乎完美的。作者制作了有价值的录像带，可以展示不同设计的钢筋混凝土试件在强震作用下的各种动力性能。这些视频对改进钢筋混凝土结构的抗震设计和抗震加固有一定的参考价值。

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.