THINKING OF A MANDATORY PROVISION IN CODE GB50017—2003
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摘要: GB500172003《钢结构设计规范》设置第8.9.3条为强制性条文,规定在柱脚处设置外包混凝土保护层。规范实施5年来,各地工程设计施工图审查中经常出现违反8.9.3强制性条文现象。通过对其主要原因进行分析,对柱脚外包混凝土保护层做了力学分析,得出了柱脚在风荷载或者地震作用下,外包混凝土保护层始终处于受拉的结论;建议工程设计中宜采用刚接柱脚做法,外包混凝土保护层可适当配筋。Abstract: The clause 8.9.3 is set up as a mandatory provision in Code for Design of Steel Structures(GB 500172003),which prescribes that concrete cover must be set on the column foot.The code has been put in practice for more than five years,but there are many examples where the clause 8.9.3 is often violated in construction drawing examination,and the main reasons are analyzed.The mechanical analysis of concrete cover has been done,the analytic results indicate that the concrete cover is often in a state of tension under wind load and earthquake;so the fixed column foot is a good choice of structural design,and reinforced concrete cover can be used for protecting steel column foot.
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Key words:
- column foot /
- concrete cover /
- steel structure design
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