椭圆形钢管混凝土构件极限承载力分析的弹性模量缩减法  

Elastic modulus reduction method for ultimate bearing capacity of elliptical concrete filled steel tubular

作　　者：赵玉峰[1,2] 解威威 杨绿峰[1,2] ZHAO Yu-feng;XIE Wei-wei;YANG Lu-feng(School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Engineering Disaster Prevention and Structural Safety of the Ministry of Education,Nanning 530004,China;Guangxi Road&Bridge Engineering Group Co.,Ltd.,Nanning 530011,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]工程防灾与结构安全教育部重点实验室,广西南宁530004 [3]广西路桥工程集团有限公司,广西南宁530011

出　　处：《广西大学学报（自然科学版）》2022年第3期565-576,共12页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金项目(51738004);中国博士后科学基金项目(2020M673095)。

摘　　要：为了在椭圆形钢管混凝土(CFST)结构极限承载力分析中有效地应用弹性模量缩减法,研究建立椭圆形截面CFST构件的齐次广义屈服函数,据此提出椭圆形CFST结构极限承载力分析的弹性模量缩减法(EMRM)。首先利用具有分数指数幂的一阶多项式,通过回归分析研究建立了椭圆形CFST压弯构件的齐次广义屈服函数。其次,通过自适应地缩减高承载单元的弹性模量模拟结构内力重分布及塑性发展,进而通过线弹性迭代分析确定椭圆形CFST拱的承载性能。最后通过与现行增量非线性有限元法对比分析,验证了本文方法具有较好的计算精度和计算效率。The homogeneous generalized yield function and elastic modulus reduction method(EMRM)was presented in order to effectively use elastic modulus reduction method(EMRM)in ultimate bearing capacity analysis of the elliptical concrete filled steel tubular(CFST).Firstly,the homogeneous generalized yield function was constructed for the CFST member using the first order polynomial with fractional exponential powers by means of the regression technique.Secondly,the redistribution of internal forces and the plastic development of the structure were simulated by reducing strategically the elastic modulus of highly-stressed elements,while the ultimate bearing capacity of CFST structure was evaluated by linear elastic iteration.Finally,it was validated that the proposed EMRM is accurate enough with high computational efficiency for evaluating the ultimate bearing capacity of the CFST structure by comparison with the results from the incremental nonlinear finite element method.

关 键 词：弹性模量缩减法 椭圆形钢管混凝土 极限承载力 齐次广义屈服函数 

分 类 号：TU398[建筑科学—结构工程]