We have designed four joint, JD-1 is designed for the comparison, and the others consider the cross-section size, reinforcement and the shear ring number.

结果表明：增大环梁截面、提高环梁的配筋率和增加抗剪环数量能不同程度的提高环梁节点承载能力。

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Crack perpendicular to the axis is caused on too rapid quench cooling, non-hardenability of the thick-walled department, as well as mutation of cross-section size. This is a typical arc-shaped crack.

垂直于轴线的裂纹是因为淬火快速冷却时。厚壁处未淬透以及截面尺寸突变产生的弧形裂纹。

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Flat tube in any cross section are oblong, the length of the shaft according to the tube pitch to determine the size of.

扁管在任何一个截面均为长圆形，其长短轴根据管心距的大小来确定。

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