火灾下钢-混凝土组合楼盖的声发射监测及分析
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摘要
为研究火灾下钢-混凝土组合楼盖的损伤机理,利用声发射技术对组合楼盖不同位置处的声发射信号进行监测.通过声发射系统采集的振铃计数、幅值、能量和持续时间等基本参数,结合试验宏观现象,对声发射进行振铃计数分析、RA-AF关联分析和b值-能量分析.研究表明:根据振铃计数信号,可判断构件的裂缝开展密集程度及内力变化,在降温阶段,次梁会对钢筋混凝土板产生剪切裂缝,使结构产生二次破坏;RA-AF关联分析能准确地判断出组合楼盖的失效模式,可根据其失效模式进行相应的内力分析;b值-能量分析可反映出试件破坏时的能量变化及试件的损伤程度,并推断出构件是否达到相应的破坏状态.
To study the damage mechanism of steel-concrete composite floor under fire,an acoustic emission technology was used to monitor the acoustic emission signals at different positions of the composite floor.The basic parameters such as ringing count,amplitude,energy and duration collected by the acoustic emission system,combined with the experimental macroscopic phenomenon,ringing count analysis,RA-AF correlation analysis and bvalue-energy analysis were conducted for acoustic emission.The research shows that according to the ringing count signal,the cracks of the members and internal force changes can be judged;in the cooling stage,the secondary beams produces shear cracks on the reinforced concrete slabs,causing secondary damage to the structure;RA-AF correlation analysis can accurately determine the failure mode of the composite floor,and the corresponding internal force can be analyzed according to the failure mode;the b value-energy analysis can reflect the energy change of the specimen and the damage degree of the specimen,and infer whether the member has reached the corresponding damage status.
To study the damage mechanism of steel-concrete composite floor under fire,an acoustic emission technology was used to monitor the acoustic emission signals at different positions of the composite floor.The basic parameters such as ringing count,amplitude,energy and duration collected by the acoustic emission system,combined with the experimental macroscopic phenomenon,ringing count analysis,RA-AF correlation analysis and bvalue-energy analysis were conducted for acoustic emission.The research shows that according to the ringing count signal,the cracks of the members and internal force changes can be judged;in the cooling stage,the secondary beams produces shear cracks on the reinforced concrete slabs,causing secondary damage to the structure;RA-AF correlation analysis can accurately determine the failure mode of the composite floor,and the corresponding internal force can be analyzed according to the failure mode;the b value-energy analysis can reflect the energy change of the specimen and the damage degree of the specimen,and infer whether the member has reached the corresponding damage status.
引文
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[18]AGGELIS D G.Classification of craching mode in concrete by acoustic emission parameters[J].Mechanics Research Communications,2011,38(3):153-157.DOI:10.1016/j.mechrescom.2011.01.011.
[19]SHAHIDAN S,PULIN R,BUNNORI N M,et al.Damage classification in reinforced concrete beam by acoustic emission signal analysis[J].Construction and Building Materials,2013,45(13):78-86.DOI:10.1016/j.conbuildmat.3013.03.095.
[20]李冬生,杨凯舜,喻言.土木工程结构损伤声发射监测及评定:理论、方法与应用[M].北京:科学出版社,2017.
[21]FARHIDZADEH A,DEHGHAN-NIRI E,SALAMONE S,et al.Monitoring crack propagation in reinforced concrete shear walls by acoustic emission[J].Journal of Structural Engineering,2013,139(12):1-10.DOI:10.1061/(ASCE)ST.1943-541X.0000781.
[2]秦四清,李造鼎,张倬元,等.岩石声发射计数概论[M].成都:西南交通大学出版社,1993.
[3]ALIREZA F.Acoustic emission monitoring of a reinforced concrete shear wall by b-value:Based outlier analysis[J].Structural Health Monitoring,2012,12(1):3-13.DOI:10.1177/1475921712461162.
[4]张瑞,徐港,蒋赏,等.钢筋混凝土结构锈损状态的声发射监测[J].混凝土,2017,10(1):34-39.DOI:10.3969/j.issn.1002-3550.2017.01.010.
[5]葛若东,刘茂军,吕海波.钢筋混凝土梁破坏过程的声发射特征试验研究[J].广西大学学报,2011,36(1):160-165.DOI:10.13624/j.cnki.issn.1001-7445.2011.01.018.
[6]门进杰,赵茜,朱乐,等.基于矩张量的钢筋混凝土构件损伤声发射检测方法[J].防灾减灾工程学报,2017,37(5):822-828.DOI:10.13409/j.cnki.jdpme.2017.05.019.
[7]张美琴,高振,吴海融,等.花岗石锯切过程声发射信号特征的实验[J].华侨大学学报(自然科学版),2015,36(6):615-619.DOI:10.11830/ISSN.1000-5013.2015.06.0615.
[8]李彬,张颖,温泽明,等.Q345R钢蠕变过程声发射特性实验研究[J].实验力学,2017,32(2):232-238.DOI:10.7520/1001-4888-16-121.
[9]胡国华,丁真真,朱泉水,等.基于声发射的Q345B钢失稳断裂模式识别[J].无损检测,2018,40(2):15-19.DOI:10.11973/wsjc201802004.
[10]OZAWA M,UCHIDA S,KAMADA T,et al.Study of mechanisms of explosive spalling in high-strength concrete at high temperatures using acoustic emission[J].Construction and Building Materials,2012,37(6):621-628.DOI:10.1016/j.conbuildmat.2012.06.070.
[11]杨志年.不同边界约束条件的混凝土双向板抗火性能研究[D].哈尔滨:哈尔滨工业大学,2012.
[12]朱崇绩.足尺钢筋混凝土双向板抗火性能研究[D].哈尔滨:哈尔滨工业大学,2012.
[13]ZHU Chongji,DONG Yuli,XIE Qun.Real-time monitoring of the full-scale flate-plate floor subjected to fire by acoustic emission and energy rate analysis[J].Transportation and Environment,2016(31):229-234.DOI:10.2991/iccte-16.2016.38.
[14]潘立.混凝土梁板楼盖中次梁设计方法研究[J].建筑结构,2010,40(10):82-85.DOI:10.19701/j.jzjg.2010.10.021.
[15]中冶建筑研究总院有限公司.组合楼板设计与施工规范:CECS 273-2010[S].北京:中国计划出版社,2010.
[16]中华人民共和国建设部,中华人民共和国国家质量监督检验检疫总局.建筑结构荷载规范:GB 50009-2012[S].北京:中国建筑工业出版社,2012.
[17]SOULIOTI D,BARKOULA N M,PAIPETIS A,et al.Acoustic emission behavior of steel fibre reinforced concrete under bending[J].Construction and Building Materials,2009,23(12):3532-3536.DOI:10.1016/j.conbuildmat.2009.06.042.
[18]AGGELIS D G.Classification of craching mode in concrete by acoustic emission parameters[J].Mechanics Research Communications,2011,38(3):153-157.DOI:10.1016/j.mechrescom.2011.01.011.
[19]SHAHIDAN S,PULIN R,BUNNORI N M,et al.Damage classification in reinforced concrete beam by acoustic emission signal analysis[J].Construction and Building Materials,2013,45(13):78-86.DOI:10.1016/j.conbuildmat.3013.03.095.
[20]李冬生,杨凯舜,喻言.土木工程结构损伤声发射监测及评定:理论、方法与应用[M].北京:科学出版社,2017.
[21]FARHIDZADEH A,DEHGHAN-NIRI E,SALAMONE S,et al.Monitoring crack propagation in reinforced concrete shear walls by acoustic emission[J].Journal of Structural Engineering,2013,139(12):1-10.DOI:10.1061/(ASCE)ST.1943-541X.0000781.
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