在同一地震烈度下，方形钢管混凝土结构在不同地震波作用下的地震反应有所不同。
Under the same earthquake intensity, the concrete-filled steel tubular frame has different response.
框架中的柱有四个使用圆形钢管，而剩下的两个是方形管。
The columns in four of the framed specimens used circular steel tubes while the rest two were square tubes.
目前钢管混凝土结构的主要截面形式为方形和圆形。
At present, the section types of concrete-filled steel tube included square shape and circular shape.
椭圆形截面可以比圆形、方形和多边形截面更有效地折减流体对椭圆形钢管混凝土所作用的荷载。
Compared with the cross-section shape of circle, square, polygon, elliptical section can be more effective in reduction of the load that the fluid ACTS on it.
但是薄壁钢管在轴向荷载下容易发生局部屈曲，尤其是截面形状为方形或矩形时。
However, the thin-walled steel tubes are prone to local buckling under axial pressure, especially for the square and rectangular cross-section shape.
为改善薄壁钢管混凝土柱的力学性能，提出了设冷弯直肋方形薄壁钢管混凝土柱的新型结构形式。
New type of CFTST columns with cold-formed longitudinal straight ribs is put forward to improve the mechanical capability of columns of concrete-filled thin-walled steel tube (CFTST).
采用方形空心钢管柱，分别对普通螺栓柱脚和带减震装置的柱脚进行低周往复加载试验，研究其恢复力特性。
Dynamic cyclic test was performed to study the hysteretic behaviors of steel exposed-column base with and without the device.
采用方形空心钢管柱，分别对普通螺栓柱脚和带减震装置的柱脚进行低周往复加载试验，研究其恢复力特性。
Dynamic cyclic test was performed to study the hysteretic behaviors of steel exposed-column base with and without the device.
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