CFRP约束型钢再生混凝土组合柱轴压性能有限元非线性分析  

Finite element analysis on axial compression behavior of CFRP confined steel reinforced recycled concrete composite columns

作　　者：马辉[1] 杨藩婷 黄成 阿鑫 MA Hui;YANG Fanting;HUANG Cheng;A Xin(State Key Laboratory of ECO-Hydraulics in Northwest Arid Region of China,Xi'an University of Technology,Xi'an 710048,Shaanxi,China;Henan Urban Planning Instituteand Corporation,Zhengzhou 450044,Henan,China;Qinghai Building and Materials Research Co.,Ltd.,Xining 810008,Qinghai,China;Qinghai Provincial Key Laboratory of Plateau Green Building and Ecocommunity,Xining 810008,Qinghai,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,陕西西安710048 [2]河南省城乡规划设计研究总院股份有限公司,河南郑州450044 [3]青海省建筑建材科学研究院有限责任公司,青海西宁810008 [4]青海省高原绿色建筑与生态社区重点实验室,青海西宁810008

出　　处：《实验力学》2022年第5期689-700,共12页Journal of Experimental Mechanics

基　　金：国家自然科学基金项目(51408485);陕西省自然科学基础研究计划项目(2022JM-258);青海省高原绿色建筑与生态社区重点实验室开放基金计划项目(KLKF-2021-001)。

摘　　要：在碳纤维(CFRP)约束型钢再生混凝土组合柱轴压试验的基础上,采用ABAQUS有限元软件对组合柱进行非线性分析,研究了纤维布层数、再生骨料取代率、再生混凝土强度以及长细比等设计参数对组合柱轴压性能的影响规律;组合柱的计算结果与试验结果吻合较好,验证了数值模型建立的合理性,在此基础上,还对组合柱进行了有限元参数拓展分析。结果表明:再生混凝土首先开裂且发生塑性变形,随后型钢、纵筋相继屈服,最后CFRP达到极限抗拉强度,试件发生破坏;再生粗骨料取代率的增大对构件受力性能产生不利影响;随着再生混凝土强度的提高,构件的承载力增幅较大,但延性变差;纤维布层数对组合柱承载力和变形能力影响显著,承载力最大增幅为55.2%;长细比增大对组合柱的轴压性能产生不利影响。基于上述研究,本文采用叠加原理提出了CFRP约束型钢再生混凝土组合柱的轴压承载力计算公式。Based on the axial compression test of carbon fiber reinforced polymer(CFRP) confined steel reinforced recycled concrete composite columns(CSRRC), the nonlinear analysis of composite columns was carried out by using ABAQUS software. Considering the effects of fiber cloth layers, recycled coarse aggregate(RCA) replacement rates, the compressive strength of recycled aggregate concrete, steel ratio and slenderness ratio on the axial compression performance of composite columns, the deformation diagram, stress nephogram and load-displacement curve of the composite column were obtained.The calculated results were in perfect accord withthe experimental results, which verified the rationality of the numerical model, and the parameter expansion analysis of the composite column was carried out. The results show that the recycled concrete deforms first, then the section steel and longitudinal reinforcement yield successively, and finally the CFRP reached the ultimate tensile strength, and the calculation was terminated. The increase of the replacement rate of RAC has an adverse effect on the mechanical performance of members. With the increase of recycled concrete strength, the bearing capacity of members increases greatly, but the ductility becomes worse. The number of fiber cloth layers has a significant effect on the bearing capacity and deformation capacity of composite columns, and the maximum increase of axial bearing capacity is 55.2%. The increase of slenderness ratio has an adverse effect on the axial compression performance of composite columns. Based on the superposition principle, the calculation formula of axial compressive bearing capacity of CSRRC is proposed. The research conclusion provides a technical reference for the application of CSRRC.

关 键 词：碳纤维 组合柱 轴压性能 型钢再生混凝土 有限元分析 

分 类 号：TU398[建筑科学—结构工程]