火灾后钢筋套筒灌浆连接混凝土柱抗震性能研究
PDF下载 (284)陈佳威,李俊华,张振文,郑家豪,王守松.火灾后钢筋套筒灌浆连接混凝土柱抗震性能研究[J].宁波大学学报(理工版),2022,35(4):46-57.DOI:
CHEN Jiawei,LI Junhua,ZHANG Zhenwen,ZHENG Jiahao,WANG Shousong.Study on seismic performance of concrete columns connected with reinforced sleeve grouting after fire[J].Journal of Ningbo University(Natural Science & Engineering Edition),2022,35(4):46-57.DOI:
| Title: | Study on seismic performance of concrete columns connected with reinforced sleeve grouting after fire |
| 作者: | 陈佳威, 李俊华, 张振文, 郑家豪, 王守松 |
| Author(s): | CHEN Jiawei, LI Junhua, ZHANG Zhenwen, ZHENG Jiahao, WANG Shousong |
| 关键词: | 装配式混凝土结构; 钢筋套筒灌浆连接; 火灾; 抗震性能 |
| Keywords: | assembled concrete structure; reinforced sleeve grouting connection; fire; seismic performance |
| 分类号: | TU375.3 |
| 文献标识码: | A |
| 摘要: | 目前套筒灌浆连接在装配式结构中运用越来越广泛, 为了研究火灾后钢筋套筒灌浆连接混凝土柱的抗震性能, 通过有限元软件Abaqus与Python程序结合对预制混凝土柱火灾后的抗震性能进行模拟, 并经试验其结果得到验证. 在此基础上分析了混凝土柱的滞回特性、骨架曲线, 研究了剪跨比、轴压比、受火时间等因素对火灾后钢筋套筒灌浆连接混凝土柱耗能能力、延性系数、承载力等抗震性能指标的影响. 结果表明: 受火时间越长, 试件的滞回曲线捏拢现象越明显, 峰值荷载明显降低, 受火60、90、120min后, 峰值荷载分别降低26.2%~34.4%、31.8%~43.2%、39.9%~50.3%. 火灾损伤会影响预制试件的延性, 受火60、90、120min后预制试件的延性系数分别减小4.2%~28.4%、13.9%~35.8%、25.4%~33.5%. 火灾后, 预制柱的耗散能系数降低, 降低趋势与现浇试件相似; 初始刚度随着火灾时间的增长明显降低. 通过参数分析, 建立了火灾后套筒灌浆连接预制柱的承载力公式, 为火灾后同类构件承载力评估提供参考依据. |
| Abstract: | At present, the sleeve grouting connection is widely used in prefabricated structures. In order to study the seismic performance of reinforced concrete columns connected by grouted sleeve after fire, this paper conducted simulation analysis with finite element software Abaqus and Python program, and the results were further verified by experiment. The hysteretic characteristics and skeleton curves of concrete columns were analyzed. In addition, the effects of shear-span ratio, axial compression ratio and heating time on the seismic performance indexes such as energy dissipation capacity, ductility coefficient and bearing capacity of the reinforced concrete column connected by grouted sleeves after fire were studied. The results show that the longer the heating time is, the more obvious the pinching effect of the specimen’s hysteretic curve is, and the more significant the peak load decreases. After 60, 90 and 120min, the peak load was reduced by 26.2%-34.4%, 31.8%-43.2% and 39.9%-50.3% respectively. Fire damage may affect the ductility of prefabricated specimens, and the ductility coefficient of prefabricated specimens are decreased by 4.2%-28.4%, 13.9%-35.8% and 25.4%-33.5% respectively after being exposed to fire for 60, 90 and 120 minutes. After the fire, the energy dissipation coefficient of the precast column decreases, and the decreasing trend is similar to that of the cast-in-place specimen. The initial stiffness decreases obviously with the increasing of the fire time. Through parameter analysis, the bearing capacity formula of precast columns connected by grouted sleeve after fire is established, which provides a reference basis for the evaluation of the bearing capacity of similar members after fire. |
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| 备注/Memo: | 收稿日期: 2021－12－17. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/基金项目: 浙江省自然科学基金（LZ22E080002）; 福建省自然科学基金（2021J01541）.第一作者: 陈佳威（1998－）, 男, 浙江绍兴人, 在读硕士研究生, 主要研究方向: 装配式结构抗震研究. E-mail: chenjiawei_1998@163.com*通信作者: 李俊华（1977－）, 男, 湖南安仁人, 教授, 主要研究方向: 组合结构、结构抗震抗火及修复. E-mail: lijunhua@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
