外方内圆复合钢管混凝土抗弯性能及承载力实用计算  

Flexural Behavior and Practical Calculation of Load Bearing Capacity for Compositesectioned Square Concrete Filled Steel Tube Reinforced by Inner Circular Steel Tube

作　　者：郑永乾[1,2] 何春霞[1] 郑莲琼[1] 

机构地区：[1]福建省土木工程新技术与信息化重点实验室(福建工程学院),福建福州350118 [2]福州大学土木工程学院,福建福州350116

出　　处：《建筑科学》2016年第5期34-38,共5页Building Science

基　　金：国家自然科学基金项目(No.51308119);福建省资助省属高校科研专项项目(JK2015029)

摘　　要：对外方内圆复合钢管混凝土的纯弯力学性能进行了有限元模拟,计算结果得到试验结果的验证。在此基础上,进行了荷载-变形全过程受力分析和影响因素分析,基于钢管混凝土简单叠加方法,引入组合提高系数,提出了外方内圆复合钢管混凝土抗弯承载力实用计算公式。研究结果表明,外方内圆复合钢管混凝土抗弯承载力比简单叠加结果大,其组合提高系数的主要影响因数是外管屈服强度、夹层混凝土抗压强度和内外管尺寸比,且该系数随着外管屈服强度的增加、内外管尺寸比的增加而增加,随着夹层混凝土抗压强度的降低而增加;抗弯承载力简化计算结果与实测结果和有限元结果吻合良好,且总体稍偏于安全。The flexural behavior of composite-sectioned square concrete filled steel tube reinforced by inner circular steel tube is simulated by finite element method. The calculated results are validated by the experimental results.Furthermore,the whole mechanical characteristics of load-deformation curve and parameter influence of the composite-sectioned members are analyzed. Based on the simple additive rule of concrete filled steel tubes,a composite increased coefficient is introduced and the practical calculation formula on flexural load bearing capacity of this kind of composite members is proposed. The results show that,the flexural load bearing capacities of composite-sectioned square concrete filled steel tubes reinforced by inner circular steel tube are higher than the results predicted by the simple additive rule. The main parameters influencing the composite increased coefficient are strength of outer tube,compressive strength of sandwich concrete and the dimension ratio of inner tube to outer tube. With the increase of outer tube strength,the dimension ratio of inner tube to outer tube or the decrease of sandwich concrete compressive strength,the composite coefficient increases. The flexural load bearing capacities calculated by the simplified calculation formula agree well with the finite element results and they show a tendency to safe as a whole.

关 键 词：复合钢管混凝土 外方内圆 抗弯性能 承载力 

分 类 号：TU398.9[建筑科学—结构工程]