摘要
绿色高性能纤维增强水泥基复合材料是一种用大掺量粉煤灰替代水泥的改性工程水泥基复合材料,具有优异的延性与抗震耗能能力。为解决火灾后RC柱抗震等问题,提出采用GHPFRCC材料加固方法。对采用GHPFRCC材料加固RC柱进行拟静力试验,并采用OpenSees有限元软件进行数值模拟,通过对比模拟结果与试验结果,验证有限元分析的可靠性。结果表明:滞回曲线、骨架曲线的试验值和模拟值整体吻合,极限承载力的偏差不大;与未加固RC柱相比,经过加固后的RC柱变形能力明显增加,加固后极限承载力提高26.63%,极限位移提高12.5%,后期水平荷载退化速率降低,滞回曲线更加饱满,抗震性能更加优秀。同时使用OpenSees进行参数分析可知,为了保证RC加固柱的延性与承载力,必须控制轴压比,建议GHPFRCC置换高度大于1/3柱高。
Green High-Performance Fiber-Reinforced Cementitious Composites(GHPFRCC)is a material of Engineered Cementitious Composite(ECC),where cement is substituted by a large amount of fly ash,with excellent ductility and energy dissipation capacity.In order to increase the seismic performance of RC columns after fire,a reinforcement method was proposed by using GHPFRCC materials.Pseudo static tests of RC columns reinforced by GHPFRCC materials was carried out,and numerical simulation was performed by using OpenSees.The reliability of the finite element analysis was verified by comparing the simulation results with the test results.Based on the test results and finite element analysis,it was proved that the hysteresis loop and the skeleton curve obtained from the tests were in good agreement with those from the simulation,and the deviation of the ultimate bearing capacity was not large.Compared with unreinforced RC columns,the deformation capacity of RC columns increased obviously.Specifically,the ultimate bearing capacity and the limit displacement increased respectively by 26.63%and 12.5%after reinforcement.Meanwhile,the degradation rate of post horizontal load decreased,the hysteresis loop became fuller,and the seismic performance was better.Furthermore,aparametric analysis was carried out using OpenSees.The analysis showed that the axial compression ratio must be well controlled in order to ensure the ductility and bearing capacity of RC columns;it is suggested that the replacement height of GHPFRCC materials is greater than one third of the column height.
作者
赵文浩
李秀领
ZHAO Wenhao;LI Xiuling(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Shandong Co-Innovation Center of Green Building,Jinan 250101,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2019年第1期54-60,共7页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(51108253
51278290)
长江学者和创新团队发展计划教育部创新团队项目(IRT13075)资助
关键词
绿色高性能纤维增强水泥基复合材料
火损
加固
抗震性能
数值模拟
Green High-Performance Fiber-reinforced Cementitious Composites(GHPFRCC)
fire damage
reinforcement
seismic performance
numerical simulation
