高强薄壁圆钢管混凝土构件弯曲承载性能研究  

Research on the bending bearing performance of high-strength thin-walled concrete filled circular steel tube components

作　　者：李军心 孙清[1] Li Junxin;Sun Qing(School of Human Settlements and Civil Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Fujian Mingtai Group Co.Ltd,Xiamen 361000,China)

机构地区：[1]西安交通大学人居环境与建筑工程学院,陕西西安710049 [2]福建铭泰集团有限公司,福建厦门361000

出　　处：《建筑科学》2024年第7期9-15,共7页Building Science

基　　金：福建省住房和城乡建设厅科技研究开发计划项目(2022-K-133)。

摘　　要：为研究高强薄壁钢管混凝土构件抗弯性能,建立了有限元数值模型,并与试验对比验证了数值模型准确性,分析了混凝土强度等级、钢材屈服强度及含钢率对高强薄壁钢管混凝土构件抗弯承载力的影响规律,并评估了现行规范承载力计算公式的适用性。结果表明:有限元模型能较好模拟试件的破坏模式(跨中失效)、荷载-位移曲线及承载力;增加钢材强度或混凝土强度等级,承载力呈近似线性增长,但混凝土强度对承载力的影响小于钢管强度等级;当钢管厚度相同,含钢率逐渐增大时,构件和核心混凝土截面尺寸越小,试件承载力降低程度逐渐减小;可采用《钢管混凝土结构技术规范》GB 50936-2014计算高强薄壁钢管混凝土构件抗弯承载力。In order to study the bending performance of high-strength thin-walled steel tube concrete members,a finite element numerical model is established and compared with experiments to verify the accuracy of the numerical model.The influence of concrete strength grade,steel yield strength,and steel content on the bending bearing capacity of high-strength thin-walled steel tube concrete members is analyzed,and the applicability of the current standard bearing capacity calculation formula is evaluated.The results indicate that the finite element model can effectively simulate the failure mode(mid span failure),load displacement curve,and bearing capacity of the specimen;Increasing the strength of steel or concrete results in an approximate linear increase in bearing capacity,but the impact of concrete strength on bearing capacity is smaller than that of steel pipe strength grade;When the thickness of the steel pipe is the same and the steel content gradually increases,the smaller the cross-sectional size of the component and core concrete,and the degree of decrease in the bearing capacity of the specimen gradually decreases;Technical code for concrete filled steel tubular structures can be used to calculate the flexural bearing capacity of high-strength thin-walled steel tube concrete members.

关 键 词：高强薄壁钢管混凝土 高强钢 抗弯性能 有限元模拟 参数分析 

分 类 号：TU37[建筑科学—结构工程]