往复荷载作用下内置CFRP型材方钢管混凝土纯弯构件的有限元分析  

Finite Element Analysis on the Concrete-Filled Square Steel Tubular Pure Bending Members Encased with CFRP Profile Under Cyclic Loading

作　　者：邱增美 叶紫璇 李帼昌[1] 刘润泽 Zengmei Qiu;Zixuan Ye;Guochang Li;Runze Liu(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China)

机构地区：[1]沈阳建筑大学土木工程学院,沈阳110168

出　　处：《钢结构（中英文）》2024年第7期29-37,共9页Steel Construction（Chinese & English）

基　　金：国家自然科学基金项目(52108160,51938009);辽宁省教育厅基本科研项目(LJKZ0566);辽宁省博士科研启动基金计划项目(2021-BS-167)。

摘　　要：碳纤维增强复合材料(CFRP)具有强度高、耐腐蚀性好等特点,将工字形CFRP型材内置于钢管混凝土结构中形成新型组合构件,不仅可以提高构件的力学性能,还可以减少材料用量、降低结构自重、减小构件截面尺寸,更适用于超高层、大跨度、重载荷等建筑结构。钢管混凝土柱作为建筑结构中的主要抗侧力构件,在经受地震作用时往往决定着整体结构的抗震性能,直接关系到人们的生命及财产安全。目前国内外相关设计规范及标准均不适用于新型组合构件的抗震设计,因此,亟需对其抗震性能展开深入研究。采用有限元分析软件ABAQUS对往复荷载作用下内置CFRP型材方钢管混凝土纯弯构件进行滞回性能研究。首先,基于现有文献对建模过程进行验证,确认所建模型的准确性和适用性,进而建立大量精细化的内置工字形CFRP型材方钢管混凝土纯弯构件的数值分析模型;然后在此基础上,以典型构件为例,进行受力全过程分析及各部件在特征点处的应力分析;最后,研究不同混凝土抗压强度、钢材屈服强度和含钢率等因素作用下,内置CFRP型材对方钢管混凝土纯弯构件的抗弯承载力和耗能能力的影响。结果表明:内置CFRP型材方钢管混凝土纯弯构件的荷载-位移骨架曲线可定义为三个阶段:弹性阶段、弹塑性阶段和下降阶段。通过对典型构件进行受力全过程分析可知,构件处于弹性阶段与弹塑性阶段时,相比于核心混凝土和工字形CFRP型材,钢管主要承担荷载作用;在下降阶段时,CFRP型材承担荷载比例有所提高,说明内置CFRP型材可有效提高构件在加载后期的承载力及延性,故与普通钢管混凝土构件相比,CFRP型材较好的抗拉性能使得新型组合构件的抗弯性能得到明显的改善。基于大量参数分析结果可知:含钢率对内置CFRP型材方钢管混凝土柱的承载力及耗能能力均有显著影响,当钢管壁�Carbon fiber reinforced polymer(CFRP)has the characteristics of high-strength and good corrosion resistance.Encased I-shaped CFRP profile into concrete-filled square steel tubular structure(CFRP-CFSST)forming a new-typed composite member can not only improve the mechanical properties of the member,but also reduce the material consumption,the dead weight of the structure and the cross-sectional size of the member.It is more suitable for super high-rise,large-span and heavy-load structures.As a critical lateral force-resisting member in structures,CFST often determines the seismic performance of the whole structure when subjected to an earthquake,which is directly related to the safety of people's lives and property.At present,the relevant design codes and standards around the world are not suitable for the seismic design of new composite members,so it is necessary to carry out in-depth research on its seismic performance.In this paper,finite element analysis software,ABAQUS,was used to study the seismic performance of the flexural behavior of CFRP-CFSST pure bending members.Firstly,considering the accuracy and applicability,the finite element model was verified with the existing literature,and a large number of refined models of CFRP-CFSST pure bending members were established based on the verified model.Then,on this basis,the whole process of stress analysis and stress analysis of each component at characteristic points were carried out based on the typical member.Finally,the effects of concrete compressive strength,steel yield strength and steel ratio on the flexural capacity and energy dissipation capacity of CFRP-CFSST pure bending members were studied.The simulation results indicated that the load-displacement envelope curves of the CFRP-CFSST pure bending member can be defined as three stages:elastic stage,elastoplastic stage and descending stage.Through the whole process analysis of typical members,in the elastic stage and elastoplastic stage,the load is mainly borne by the steel tube compared to the core c

关 键 词：CFRP型材 钢管混凝土柱 滞回曲线 数值分析 

分 类 号：TU398.9[建筑科学—结构工程]