着重介绍方钢管与圆钢管连接的节点设计方法。
The design problems about the joints of different steel tube were introduced.
表明内（圆）钢管增强方钢管混凝土柱的耐火性能是明显的。
Results show that the fire resisting performance of the columns is efficient.
无缝钢管专家表示，这种“最后通牒”的方式，是对需求方非常过分的要求。
Seamless steel pipe, experts say this "ultimatum" approach, is the demand side is very excessive.
无缝钢管专家表示，这种“最后通牒”的方式，是对需求方非常过分的要求。
Seamless steel pipe, experts say this "ultimatum" approach, is the demand side is very excessive.
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