A 3-d nonlinear finite element model of concrete-filled rectangular tubular frame is proposed in the paper to research the seismic behavior of this type of structure under low-reversed cyclic loading.

本文建立了方钢管混凝土框架结构的三维非线性有限元分析模型，用以研究方钢管混凝土框架在低周反复荷载作用下的抗震性能。

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When the footage was first shot, each frame was run consecutively through red, green or blue gels, and the process needed to be reversed during projection to reveal the color.

ENGADGET: World's oldest color film footage discovered in museum archive (video)