内置工字形CFRP的高强圆钢管高强混凝土纯弯构件抗弯刚度研究  

Study on Flexural Stiffness of High-strength Concrete-filled High-strength Circular Steel Encased with I-shaped CFRP

作　　者：李帼昌[1] 张雪芳 LI Guochang;ZHANG Xuefang(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2024年第3期385-394,共10页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金重点项目(51938009);国家自然科学基金面上项目(51878419)。

摘　　要：目的研究内置工字形CFRP型材高强圆钢管高强混凝土纯弯构件的抗弯刚度,为该类构件的设计和工程应用提供参考。方法设计3个CHCFHST-CFRP构件,对其进行纯弯试验;应用ABAQUS有限元软件建立了纯弯构件数值模型,在数值模拟结果与试验结果吻合的基础上,分析各参数对构件抗弯刚度的影响;并且推导了适用于纯弯构件的抗弯刚度和挠度计算公式。结果试件均未出现断裂,钢管也未产生局部鼓曲,卸载后纯弯段有明显回弹;随着混凝土强度、钢管壁厚和型材尺寸的增长,构件抗弯刚度略有增长;与未配置CFRP型材的构件相比,配置CFRP型材后构件的抗弯刚度有了明显的增长。结论试件整体呈弯曲破坏模态,具有良好的变形能力,具有较强的耗能能力及刚度退化能力;利用笔者推导的公式得到的计算值与试验结果吻合较好,公式可用来计算此类构件的抗弯刚度与挠度。In order to provide references for the design and engineering application of high-strength concrete-filled high-strength circular steel encased with I-shaped CFRP(CHCFHST-CFRP),the bending stiffness of this kind of member was studied.Three CHCFHST-CFRP members were designed and tested under pure bending.The finite element software ABAQUS was used to establish the numerical analysis model of these pure bending members.Based on the agreement between the numerical simulation and the experimental results,the influence of each parameter on the bending stiffness of the members was analyzed.The calculation formulas of bending stiffness and deflection suitable for pure bending members were derived.There was no fracture occurred in the test specimens,and there was no local bulging occurred in the steel tube.After unloading,there was obvious rebound in the pure bending section.With the increase of concrete strength,steel tube wall thickness and profile size,the bending stiffness of the component increases slightly.Compared with the components without CFRP profiles,the bending stiffness of the components with CFRP profiles has increased significantly.The whole specimen was in bending failure mode,with good deformation ability,strong energy dissipation ability and stiffness degradation ability.The calculated values obtained by the formula derived by the author are in good agreement with the experimental results,and the formula can be used to calculate the bending stiffness and deflection of such components.

关 键 词：工字形CFRP型材 高强圆钢管高强混凝土 抗弯刚度 计算公式 

分 类 号：TU398.1[建筑科学—结构工程]