BFRP模壳不排水加固RC墩柱恢复力模型  

A restoring force model of RC pier columns reinforced by a BFRP shell without drainage

作　　者：张景杭 夏樟华[2] 姜绍飞[2] 洪俊贤 朱朴[1] 范千[2] ZHANG Jinghang;XIA Zhanghua;JIANG Shaofei;HONG Junxian;ZHU Pu;FAN Qian(College of Civil and Architectural Engineering,Liming Vocational University,Quanzhou 362000,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Civil Engineering Concrete Materials Fujian University Application Technology Engineering Center,Quanzhou 362000,China)

机构地区：[1]黎明职业大学土木建筑工程学院,福建泉州362000 [2]福州大学土木工程学院,福州350108 [3]土建工程混凝土材料福建省高等学校应用技术工程中心,福建泉州362000

出　　处：《振动与冲击》2024年第16期192-203,共12页Journal of Vibration and Shock

基　　金：国家“十四五”重点专项课题(2023YFF0906102);福建省自然科学基金重点项目(2022J02016);黎明职业大学博士科研启动基金(LZB202301)。

摘　　要：为研究玄武岩纤维增强聚合物(basalt fiber reinforced polymer, BFRP)模壳不排水加固钢筋混凝土(reinforced concrete, RC)墩柱抗震恢复力模型,在拟静力试验基础上,采用OpenSees有限元软件对模壳加固墩柱进行数值分析,主要研究参数为填充层混凝土强度、模壳厚度、加固高度、轴压比。研究表明:填充层混凝土强度等级越高,墩柱抗震性能有所增强,但C40以上的填充层混凝土强度等级墩柱的抗震性能较为接近;模壳加固厚度较大墩柱的抗震性能优于厚度较小墩柱;当模壳加固高度较高时,墩柱的抗震性能较好,当加固高度大于2~3倍原墩柱塑性铰高度时,抗震性能提升效果趋于稳定;轴压比越大,墩柱的刚度退化较快,不利延性发展。后通过数据回归分析,建立了BFRP模壳加固RC墩柱恢复力模型,对比可知,恢复力模型与试验曲线拟合较好,能有效反映加固墩柱的滞回性能,可为此类结构的抗震性能分析提供参考。To study the seismic restoring force model of BFRP(Basalt Fiber Reinforced Polymer)shell reinforced RC pier columns without drainage,numerical analysis was conducted on the shell reinforced RC pier columns using OpenSees finite element software on the basis of quasi-static tests.The main research parameters were the strength of filled layer concrete,shell thickness,reinforcement height,and axial compression ratio.Research had shown that:The higher the strength level of the filled layer concrete,the stronger the seismic performance of the pier column.However,the seismic performance of the filled layer concrete with a strength level above C40 was relatively similar to that of the pier column;The seismic performance of pier columns with larger thickness reinforced by formwork was better than that of pier columns with smaller thickness;When the reinforcement height of the formwork was high,the seismic performance of the pier column was good.When the reinforcement height was greater than 2-3 times the plastic hinge height of the original pier column,the seismic performance improvement effect tendsed to be stable;The larger the axial compression ratio,the faster the stiffness degradation of the pier column,which was unfavorable for the development of ductility.Then through data regression analysis,a restoring force model for BFRP shell reinforced RC pier columns was established.The comparison showed that the restoring force model fitted well with the experimental curve and could effectively reflect the hysteresis performance of the reinforced pier columns,providing reference for the seismic performance analysis of such structures.

关 键 词：玄武岩纤维增强聚合物(BFRP)模壳 不排水加固 钢筋混凝土(RC)墩柱 有限元 参数分析 恢复力模型 

分 类 号：TB375.3[一般工业技术—材料科学与工程]