锈蚀钢筋混凝土框架节点高温后抗震性能试验研究
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摘要
为研究钢筋锈蚀对高温后钢筋混凝土框架节点承载力及抗震性能的影响,设计了4个钢筋混凝土框架梁-柱节点,通过快速氯离子试验使节点钢筋发生不同程度的锈蚀。对4个节点先后进行1 h的火灾试验及低周反复荷载试验,获得节点各截面的温度场分布规律,研究了钢筋锈蚀率对火灾后节点承载能力、刚度、延性、耗能能力等的影响。试验结果表明:随着锈蚀率的增加,节点的承载能力、刚度、耗能能力显著降低;节点的延性整体呈下降趋势,但轻微锈蚀损伤使高温后节点延性略微增加;与未锈蚀节点相比,锈蚀钢筋混凝土节点的屈服荷载降幅为37.93%,极限荷载降幅为28.11%,核心区受剪承载力降幅为35.92%。考虑初始损伤及高温作用对混凝土材料性能的影响,提出了节点核心区受剪承载力计算公式,计算结果与试验结果基本吻合。
Four RC frame beam-column joints were designed to study the effects of reinforcement corrosion on bearing capacity and seismic behavior of RC frame joints after fire. Four joints were designed to make the steel rebar suffer from different degrees of corrosion by electrochemistry accelerated corrosion test. The one-hour fire test and low cyclic loading test were carried out orderly on the four joints to get the distribution rule of temperature field along each crosssection and then study the effects of reinforcement corrosion rate on bearing capacity,ductility,stiffness,energy dissipation of RC joins after fire. The results show that bearing capacity,stiffness and energy dissipation of the joints after fire are decreased significantly with the increase of corrosion rate. Though ductility of the joint with slight corrosion is increased slightly,the ductility of the joints is decreased on the whole with the increase of corrosion rate.Compared with the joint without corrosion,the range of reduction of corroded RC joints after fire could be as much as37. 93% of yield load,28. 11% of ultimate load and 35. 92% of core shear bearing capacity. At last,a formula for the residual shear bearing capacity of RC joints was proposed considering the effect of the initial damage and high temperature on the rebar and concrete. The calculated results agree with the experimental data well.
Four RC frame beam-column joints were designed to study the effects of reinforcement corrosion on bearing capacity and seismic behavior of RC frame joints after fire. Four joints were designed to make the steel rebar suffer from different degrees of corrosion by electrochemistry accelerated corrosion test. The one-hour fire test and low cyclic loading test were carried out orderly on the four joints to get the distribution rule of temperature field along each crosssection and then study the effects of reinforcement corrosion rate on bearing capacity,ductility,stiffness,energy dissipation of RC joins after fire. The results show that bearing capacity,stiffness and energy dissipation of the joints after fire are decreased significantly with the increase of corrosion rate. Though ductility of the joint with slight corrosion is increased slightly,the ductility of the joints is decreased on the whole with the increase of corrosion rate.Compared with the joint without corrosion,the range of reduction of corroded RC joints after fire could be as much as37. 93% of yield load,28. 11% of ultimate load and 35. 92% of core shear bearing capacity. At last,a formula for the residual shear bearing capacity of RC joints was proposed considering the effect of the initial damage and high temperature on the rebar and concrete. The calculated results agree with the experimental data well.
引文
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[13]李炜星,苗吉军,刘延春,等.考虑海洋环境损伤的钢筋混凝土框架节点受火性能试验研究[J].建筑结构学报,2016,37(1):13-20.(LI Weixing,MIAO Jijun,LIU Yanchun,et al.Experimental research on fire resistance performance for RC frame joints with damages caused by marine environment[J].Journal of Building Structures,2016,37(1):13-20.(in Chinese))
[14]过镇海.钢筋混凝土原理[M].北京:清华大学出版社,2013:312-313.(GUO Zhenhai.Reinforced concerte theory[M].Beijing:Tsinghua University Press,2013:312-313.(in Chinese))
[15]肖建庄,黄珏,张建荣,等.高性能混凝土异型柱边框架抗震性能试验研究[J].建筑结构学报,2002,23(6):19-25.(XIAO Jianzhuang,HUANG Yu,ZHANG Jianrong,et al.Experimental study on seismic behavior of HPC side frame structure with specially-shaped columns[J].Journal of Building Structures,2002,23(6):19-25.(in Chinese))
[16]吴波.火灾后钢筋混凝土结构的力学性能[M].北京:科学出版社,2003:59-60.(WU Bo.Mechanical properties of reinforced concrete structures after fire[J].Beijing:Science Press,2003:59-60.(in Chinese))
[17]余志武,王中强,史召锋.高温后新Ⅲ级钢筋力学性能的试验研究[J].建筑结构学报,2005,26(2):112-116.(YU Zhiwu,WANG Zhongqiang,SHI Zhaofeng.Experimental research of mechanical performance of new typeⅢreinforcement after high temperature[J].Journal of Building Structures,2005,26(2):112-116.(in Chinese))
[18]马良喆,陈慧娟,白常举.钢筋锈蚀后力学性能的试验研究[J].施工技术,2000,29(12):43-44.(MA Liangzhe,CHEN Huijuan,BAI Changju.Experimental research of mechanical performance of corroded reinforcement[J].Journal of Construction Technology,2000,29(12):43-44.(in Chinese))
[19]曹忠民,李爱群.钢筋混凝土梁柱节点最新抗剪通用分析模型的修正[J].铁道工程学报,2005,22(6):28-31.(CAO Zhongmin,LI Aiqun.Modification of newest universal analysis model for resisting shear to reinforced beam-column node[J].Journal of Railway Engineering Society,2005,22(6):28-31.(in Chinese))
[20]秦全,王立成,宋玉普.混凝土框架节点受剪承载力计算模型和方法研究[J].建筑结构,2013,43(8):63-68.(QIN Quan,WANG Licheng,SONG Yupu.Study on analytical models and improvement for the shear loading capacity of reinforced concrete beamcolumn interior joints[J].Building Structure,2013,43(8):63-68.(in Chinese))
[2]CHOI Yoon Suk,YI Seong-Tae,KIM Myung Yu,et al.Effect of corrosion method of the reinforcing bar on bond characteristics in reinforced concrete specimens[J].Construction and Building Materials,2014,54(3):180-189.
[3]朱伯龙,陆洲导,胡克旭.高温(火灾)下混凝土与钢筋的本构关系[J].四川建筑科学研究,1990,16(1):37-43.(ZHU Bolong,LU Zhoudao,HU Kexu.Strainstress relation of concrete and steel under high temperature(fire)[J].Sichuan Building Science,1990,16(1):37-43.(in Chinese))
[4]过镇海,时旭东,杨建平,等.钢筋混凝土的高温性能及其计算[M].北京:清华大学出版社,2004:187-188.(GUO Zhenhai,SHI Xudong,YANG Jianping,et al.Behavior of reinforced concrete at elevated temperature and its calculation[M].Beijing:Tsinghua University Press,2004:187-188.(in Chinese))
[5]傅传国,王广勇,王玉镯.钢筋混凝土框架节点抗火性能试验及理论分析[J].东南大学学报(自然科学版),2010,40(4):822-828(FU Chuanguo,WANG Guangyong,WANG Yuzhuo.Experimental and Theoretical research on fire resistance behaviour of reinforced concrete structure[J].Journal of Southeast University(Natural Science Edition),2010,40(4):822-828.(in Chinese))
[6]肖建庄,谢猛.高性能混凝土框架火灾后抗震性能试验研究[J].土木工程学报,2005,38(8):36-42.(XIAO Jianzhuang,XIE Meng.An experimental study on the seismic behavior of HPC frames after fire[J].China Civil Engineering Journal,2005,38(8):36-42.(in Chinese))
[7]戴靠山,袁迎曙.锈蚀框架边节点抗震性能试验研究[J].中国矿业大学学报,2005,34(1):51-56.(DAI kaoshan,YUAN Yingshu.Experimental study on seismic performance of corroded exterior joints in RC frame[J].Journal of China University of Mining&Technology,2005,34(1):51-56(in Chinese))
[8]梁应军.反复荷载作用下锈蚀钢筋混凝土梁节点试验研究[D].长沙:中南大学,2013:11-76.(LIANG Yingjun.Experimental study on corroded reinforced concrete beam joint under cyclic loading[D].Changsha:Central South University of Technology,2013:11-76.(in Chinese))
[9]金伟良,赵羽习.混凝土结构耐久性[M].北京:科学出版社,2003:26-28.(JIN Weiliang,ZHAO Yuxi.The durability of concrete structure[M].Beijing:Science Press,2003:26-28.(in Chinese))
[10]苗吉军,陈娜,侯晓燕,等使用损伤与高温耦合作用下钢筋混凝土梁火灾试验研究与数值分析[J].建筑结构学报,2013,34(3):1-11.(MIAO Jijun,CHEN Na,HOU Xiaoyan,et al.Experimental research and numerical simulation on fire resistance performance of RC beams with damages caused by service loading[J].Journal of Building Structures,2013,34(3):1-11(in Chinese))
[11]苗吉军,公伟,陈娜,等使用损伤钢筋混凝土柱火灾受力性能试验研究与数值分析[J].建筑结构学报,2013,34(8):56-64.(MIAO Jijun,GONG Wei,CHEN Na,et al.Experimental research and numerical simulation analysis on fire resistance performance of RC columns with damages caused by service loading[J].Journal of Building Structures,2013,34(8):56-64(in Chinese))
[12]苗吉军,姜宏兴,刘延春,等.考虑海洋环境钢筋锈蚀的混凝土轴压柱受火性能试验研究[J].建筑结构学报,2015,36(6):137-157.(MIAO Jijun,JIANG Hongxing,LIU Yanchun,et al.Experimental research on fire resistance performance for RC columns under axial compression with rebar corrosion damages caused by marine environment[J].Journal of Building Structures,2015,36(6):137-157(in Chinese))
[13]李炜星,苗吉军,刘延春,等.考虑海洋环境损伤的钢筋混凝土框架节点受火性能试验研究[J].建筑结构学报,2016,37(1):13-20.(LI Weixing,MIAO Jijun,LIU Yanchun,et al.Experimental research on fire resistance performance for RC frame joints with damages caused by marine environment[J].Journal of Building Structures,2016,37(1):13-20.(in Chinese))
[14]过镇海.钢筋混凝土原理[M].北京:清华大学出版社,2013:312-313.(GUO Zhenhai.Reinforced concerte theory[M].Beijing:Tsinghua University Press,2013:312-313.(in Chinese))
[15]肖建庄,黄珏,张建荣,等.高性能混凝土异型柱边框架抗震性能试验研究[J].建筑结构学报,2002,23(6):19-25.(XIAO Jianzhuang,HUANG Yu,ZHANG Jianrong,et al.Experimental study on seismic behavior of HPC side frame structure with specially-shaped columns[J].Journal of Building Structures,2002,23(6):19-25.(in Chinese))
[16]吴波.火灾后钢筋混凝土结构的力学性能[M].北京:科学出版社,2003:59-60.(WU Bo.Mechanical properties of reinforced concrete structures after fire[J].Beijing:Science Press,2003:59-60.(in Chinese))
[17]余志武,王中强,史召锋.高温后新Ⅲ级钢筋力学性能的试验研究[J].建筑结构学报,2005,26(2):112-116.(YU Zhiwu,WANG Zhongqiang,SHI Zhaofeng.Experimental research of mechanical performance of new typeⅢreinforcement after high temperature[J].Journal of Building Structures,2005,26(2):112-116.(in Chinese))
[18]马良喆,陈慧娟,白常举.钢筋锈蚀后力学性能的试验研究[J].施工技术,2000,29(12):43-44.(MA Liangzhe,CHEN Huijuan,BAI Changju.Experimental research of mechanical performance of corroded reinforcement[J].Journal of Construction Technology,2000,29(12):43-44.(in Chinese))
[19]曹忠民,李爱群.钢筋混凝土梁柱节点最新抗剪通用分析模型的修正[J].铁道工程学报,2005,22(6):28-31.(CAO Zhongmin,LI Aiqun.Modification of newest universal analysis model for resisting shear to reinforced beam-column node[J].Journal of Railway Engineering Society,2005,22(6):28-31.(in Chinese))
[20]秦全,王立成,宋玉普.混凝土框架节点受剪承载力计算模型和方法研究[J].建筑结构,2013,43(8):63-68.(QIN Quan,WANG Licheng,SONG Yupu.Study on analytical models and improvement for the shear loading capacity of reinforced concrete beamcolumn interior joints[J].Building Structure,2013,43(8):63-68.(in Chinese))