构件性能对预应力CFRP加固墩柱抗震性能的影响  

Influence of member properties on seismic performance of prestressed CFRP reinforced pier columns

作　　者：卢春玲 雷振新[1] 郭铖 王强 LU Chunling;LEI Zhenxin;GUO Cheng;WANG Qiang(Guangxi Key Laboratory of Green Building Materials and Building Industrialization,Guilin 541004,China;College of Civil and Architecture Engineering,Guilin University of Technology,Guilin 541004,China;Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi,Guilin University of Technology,Guilin 541004,China;Guangxi Engineering Research Center of Intelligent Structural Material,Guilin 541004,China)

机构地区：[1]广西绿色建材与建筑工业化重点实验室,广西桂林541004 [2]桂林理工大学土木与建筑工程学院,广西桂林541004 [3]桂林理工大学广西有色金属隐伏矿床勘查及材料开发协同创新中心,广西桂林541004 [4]广西壮族自治区智慧结构材料工程研究中心,广西桂林541004

出　　处：《铁道科学与工程学报》2023年第9期3437-3452,共16页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51568015);广西创新驱动发展专项(桂AA20302006);广西绿色建材与建筑工业化重点实验室基金资助项目(22-J-21-10);广西重大科技创新基地建设项目(2018-242-G02)。

摘　　要：为研究高轴压比下配筋率、配箍率和剪跨比对预应力碳纤维布加固钢筋混凝土方柱抗震性能的影响,设计并制作5根钢筋混凝土方柱(包括1根未加固柱和4根加固柱),对其进行低周往复荷载试验。分析在0.7轴压比下配箍率、配筋率和剪跨比对预应力CFRP加固钢筋混凝土方柱的破坏模式、滞回特征、骨架曲线、刚度退化、延性性能和耗能能力的影响,并利用ABAQUS软件建立有限元模型对试验进行模拟,在验证模型的准确性后,对本次试验进行了扩充参数分析。研究结果表明:高轴压比下,预应力CFRP布加固能有效提高柱的水平承载能力和变形能力,对提高柱的抗震性能有利;配箍率的变化对加固柱的初始刚度和水平承载力影响较小,但对其变形能力和耗能能力影响较大,增大配箍率有利于提高加固柱的变形能力和耗能能力;配筋率对加固柱的水平承载力和变形能力有一定的影响,且与加固柱柱底塑性铰长度正相关,加固设计时应注意CFRP布约束范围完全覆盖塑性铰区;剪跨比的增大对柱的变形能力有明显的提高,但对水平承载力和刚度有极为不利的影响,对于剪跨比较大的柱,CFRP布的利用率较低,加固效率不高。研究成果可为高轴压比下预应力碳纤维布加固桥墩设计和工程应用提供试验依据。In order to study the effects of reinforcement ratio,stirrup ratio and shear span ratio on the seismic performance of RC square columns strengthened with prestressed CFRP fabric under high axial compression ratio,the low cycle reciprocating load test of 5 reinforced concrete square columns(including 1 unreinforced column and 4 reinforced columns)was carried out.The effects of stirrup ratio,reinforcement ratio and shear span ratio on the failure modes,hysteretic characteristics,skeleton curve,stiffness degradation,ductility and energy dissipation capacity of prestressed CFRP strengthened RC square columns under 0.7 axial compression ratio were analyzed.The finite element model was established with ABAQUS software to verify the test.After verifying the accuracy of the model,extended parameter analysis was carried out for the tests.The results show that under high axial compression ratio,prestressed CFRP fabric can effectively improve the horizontal bearing and deformation capacity of columns,which is beneficial to improve the seismic performance of the columns.The change of stirrup ratio has less influence on the initial stiffness and horizontal bearing capacity of the strengthened columns,but has greater influence on its deformation and energy dissipation capacity.Increase of stirrup ratio is conducive to improving the deformation and energy dissipation capacity of strengthened columns.The reinforcement ratio has a certain influence on the horizontal bearing and deformation capacity of the strengthened columns,and is positively related to the plastic hinge length at the bottom of the strengthened column.In reinforcement design,it should be noted that the constraint range of CFRP fabric completely covers the plastic hinge area.The increase of shear span ratio can obviously improve the deformation capacity of the columns,but has a very adverse effect on the horizontal bearing capacity and stiffness.For columns with large shear span ratio,the utilization rate of CFRP fabric is low and the reinforcement efficiency is

关 键 词：预应力碳纤维布 钢筋混凝土方柱 抗震性能 配筋率 配箍率 剪跨比 

分 类 号：TU375.3[建筑科学—结构工程]