摘要
为了综合考虑截面几何和材料特性对圆形截面钢管混凝土(CFST)受弯构件抗弯强度的影响,选择截面厚径比和材料强度比作为自变量,研究建立了圆CFST受弯构件截面塑性发展系数的二元函数计算表达,并建立了截面抗弯强度计算模型。首先在确定厚径比和强度比取值范围的基础上,设计1 656个圆CFST受弯构件的数值模型,利用纤维模型法计算确定每个构件的截面抗弯强度和塑性发展系数。然后选择截面钢管壁厚与外径之比、钢管强度与核心混凝土强度之比作为自变量,通过回归分析建立圆CFST构件的截面塑性发展系数的二元函数表达式,据此提出了圆CFST构件截面抗弯强度的计算模型。最后通过与试验数据、现行设计规范和研究文献中不同计算模型进行对比分析,验证了建立的圆形截面钢管混凝土受弯构件的截面塑性发展系数和抗弯强度计算模型具有更高的精度和适用性。
In order to reflect the influence of the geometry and material property on the bending strength of circular concrete-filled steel tube(CFST)flexual members,the ratio of sectional thickness to diameter and the strength ratio of steel to concrete were chosen as two arguments,while the binary computational model of sectional plastic development coefficient(PDC),then the model of bending strength was proposed for circular CFST flexual members.Firstly,the numerical models of 1656 circular CFST flexual members were designed on the basis of determining the values of sectional thickness to diameter ratio and material strength ratio,the bending strengths and the PDCs of each member were evaluated by fiber model technique.Then,a binary computational model was developed for the sectional PDC of the circular CFST member under bending moments by means of regression analysis,adopting the ratio of sectional thickness to diameter and the strength ratio of steel to concrete as two arguments.Furthermore,the computational model was proposed for bending strength of the circular CFST member using the proposed PDC.Finally,the accuracy and applicability of the proposed models for the sectional PDC and the bending strength of the circular CFST flexual members were demonstrated by comparison with experimental data and existing models presented in current design specifications and literature.
作者
杨绿峰
陆振华
戎艳
YANG Lufeng;LU Zhenhua;RONG Yan(School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of the Minitry of Education,Guangxi University,Nanning 530004,China;Guangxi Communications Design Group Co.,Ltd,Nanning 530029,China)
出处
《混凝土》
CAS
北大核心
2024年第1期56-63,共8页
Concrete
基金
国家自然科学基金重点项目(51738004)。
关键词
圆钢管混凝土
塑性发展系数
抗弯强度
厚径比
circular concrete-filled steel tube
plasticity development coefficient
bending strength
ratio ofsectional thickness to diameter
