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钢管混凝土格构柱极限承载力实用计算公式

ISSN号：1672-7207
期刊名称：《中南大学学报：自然科学版》
时间：0
分类：TU398[建筑科学—结构工程]
作者机构：[1]中南大学土木工程学院高速铁路建造技术国家工程实验室,湖南长沙410075
相关基金：国家自然科学基金资助项目（50438020 50778177）; 湖南省杰出青年基金资助项目（07JJ1009）

关键词：钢管混凝土, 格构柱, 计算方法, 极限承载力, concrete-filled steel tube（CFST）, laced column, calculation method, ultimate bearing capacity

中文摘要：

在理论分析基础上,提出钢管混凝土格构柱长细比折减系数计算模型及等效长细比计算公式,并改进等效长细比计算公式。同时,利用数值计算方法对不同混凝土强度、钢材强度、缀条横截面积、缀条布置形式、偏心率、长细比的钢管混凝土格构柱构件的承载力进行仿真计算,并在改进的等效长细比基础上,分析它们对长细比折减系数的影响。结合数值计算结果及长细比折减系数计算模型,提出长细比折减系数计算公式。利用本文提出的长细比折减系数计算公式及规程CECS28：90中双系数乘积公式对构件极限承载力进行计算,并与数值计算结果及试验结果进行比较。研究结果表明：在改进的等效长细比基础上,混凝土强度、钢材强度、缀条横截面积、缀条布置形式对长细比折减系数的影响很小,可以忽略;3种计算方法计算结果吻合良好,验证了本文提出的长细比折减系数计算公式的正确性。

英文摘要：

The slender ratio reduced coefficient model and the equivalent slenderness ratio calculation formula of the concrete filled steel tubular laced columns were proposed on the basis of theory analysis,and the equivalent slenderness ratio calculation formula was improved.A lot of ultimate bearing capacities of concrete filled steel tubular laced columns with different concrete strengths,steel strengths,lace bar areas,layout forms of lace bar,eccentricity ratio and slender ratio were computed using the numerical method,and the influence of them was analysised on the basis of improved equivalent slenderness ratio.The calculation formula on the slender ratio reduced coefficient of slender ratio reduced coefficient was proposed by combining numerical calculation results and the slender ratio reduced coefficient model.Finally,a lot of ultimate bearing capacities of components were computed using the calculation formula of slender ratio reduced coefficient and the double coefficient product formula of the regulation CECS28：90,and the calculation results were compared with the numerical calculation results and the test results.The results indicate that the concrete strength,steel strength,lace bar area,layout form of lace bar have little influence on the slender ratio reduced coefficient on the basis of improved equivalent slenderness ratio,and the influence can be neglected.The results agree well with each other and the slender ratio reduced coefficient calculation formula is verified to be correct.

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