welded thin-walled steel tubes 焊接薄壁钢管
filled thin-walled square steel tubes 薄壁方钢管
thin-walled concrete filled steel tubes 薄壁钢管混凝土短柱
However, the thin-walled steel tubes are prone to local buckling under axial pressure, especially for the square and rectangular cross-section shape.
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。
As a newly used material, steel thin-walled sonic-testing tubes used for the cast-in-situ piles have not a unified form of connecting.
混凝土灌注桩用钢薄壁声测管是一种较新的声测管材，其连接方法目前没有统一的形式。
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