《钢管混凝土结构技术规范》中承载力公式的一致性研究

Consistency study on bearing capacity formulae in the Chinese ‘Code for design of concrete filled steel tubular structures'

国家规范《钢管混凝土结构技术规范》(讨论稿)是基于CECS 254:2012、CECS 28:2012和CECS 159:2004等行业技术规程进行制定,相关承载力的计算公式来自不同的规程,公式表达形式差别较大,因此存在一定的兼容问题。为此,对规范中圆形和矩形钢管混凝土承载力计算方法进行系统的研究,分析不同规程的承载力在公式形式和计算精度上的差异性和一致性。结果表明:不同规程的承载力公式虽然在形式上存在一定的差异,但是其内在本质规律相同;通过和大量试验数据的对比,证明了承载力公式的精度都在工程容许的范围内,且总体偏于安全,初步证明国家规范中相关承载力计算方法的一致性和合理性。

The latest national standard of the Chinese ‘Code for design of concrete filled steel tubular structures'(discussion vision) was proposed based on the technical specifications of concrete filled steel tube(CFST) CECS 254: 2012,CECS 28: 2012 and CECS 159: 2004,etc.Because the formulae of the bearing capacity for CFSTs are from different technical specifications,which have different forms,their consistency need to be studies.In this paper,the calculation methods of bearing capacity for CFST with various cross-section shapes in the national standard are compared systematically.Diversity and consistency of calculation accuracy of bearing capacity calculation formulae and formula forms from different technical specifications are also analyzed.The results show that although there are some differences in bearing capacity formulas from different technical specifications,the essential rules are still the same and calculation precision is within the scope of engineering tolerance and on the safety side,which preliminarily demonstrate the consistency and rationality of the bearing capacity calculation methods of the national standard.