塑性铰区采用PVA纤维高强混凝土柱抗震性能  

Seismic behavior of columns with PVA fiber high strength reinforced concrete in potential plastic region

作　　者：曾梓逸 缪长青[1,2] 孙传智[3] Zeng Ziyi;Miao Changqing;Sun Chuanzhi(Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education,Southeast University,Nanjing 211189,China;School of Civil Engineering,Southeast University,Nanjing 211189,China;School of Civil Engineering and Architecture,Suqian College,Suqian 223800,China)

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京211189 [2]东南大学土木工程学院,南京211189 [3]宿迁学院建筑工程学院,宿迁223800

出　　处：《东南大学学报（自然科学版）》2023年第2期242-251,共10页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(52178119)。

摘　　要：为了明确局部PVA纤维高强混凝土柱中轴压比、剪跨比和PVA纤维掺量对抗震性能的影响,对不同轴压比(0.2、0.3和0.4)、剪跨比(3.23、4.15和5.07)和PVA纤维体积分数(0、0.3%、0.5%和0.7%)的8根高强钢筋混凝土柱足尺试件进行了抗震性能试验,分析了PVA纤维掺量、轴压比和剪跨比等参数对于高强钢筋混凝土柱耗能能力、自复位能力、强度退化性能、刚度退化性能以及弯矩曲率关系的影响规律.以有限元模拟软件OpenSees为平台建立试件模型,对轴压比和剪跨比进行扩展分析.研究结果表明,PVA纤维混凝土柱的延性、耗能能力明显更优,抗震性能更好;同时,轴压比和剪跨比对抗震性能影响显著,PVA纤维掺量对其影响较大;建立的有限元模型具有较高的准确性.In order to clarify the effects of axial pressure ratio,shear-to-span ratio and PVA fiber volume fractions on the seismic performance of localized PVA fiber high-strength concrete columns,eight high-strength reinforced concrete columns with different axial pressure ratios(0.2,0.3 and 0.4),shear-to-span ratios(3.23,4.15 and 5.07)and PVA fiber volume fractions(0,0.3%,0.5%and 0.7%)were subjected to seismic performance test.The effects of PVA fiber volume fractions,axial compression ratio and shear-to-span ratio on the energy dissipation capacity,self-resetting capacity,strength degradation performance,stiffness degradation performance and bending moment curvature relationship of high-strength reinforced concrete columns were analyzed.The finite element simulation software OpenSees was used as a platform to establish the specimen model and to extend the analysis of axial compression ratio and shear-to-span ratio.The results show that the ductility and energy dissipation capacity of PVA fiber concrete columns are significantly better and the seismic performance is better;meanwhile,the axial pressure ratio and shear-span ratio have significant effects on the seismic performance,and the PVA fiber volume fractions has more influence on it;the established finite element model has high accuracy.

关 键 词：PVA纤维混凝土 抗震性能试验 OpenSees 轴压比 剪跨比 PVA纤维掺量 

分 类 号：TU377.9[建筑科学—结构工程]