界面缺陷对钢管混凝土受弯构件抗弯性能影响研究
|
摘要
钢管与核心混凝土之间的界面缺陷在很多在役钢管混凝土结构中普遍存在,是影响结构工作性能的重要原因之一。文章进行不同界面缺陷范围的圆钢管混凝土抗弯构件的抗弯性能试验研究,分析缺陷范围对试件的破坏模式、承载能力、跨中挠度、钢管表面应力等参数的影响;采用声发射技术监测了试件在加载过程中核心混凝土的内部损伤情况,分析界面缺陷范围对混凝土损伤以及试件抗弯刚度的影响规律。基于试验结果的修正,建立有限元分析模型,研究截面含钢率、核心混凝土强度、界面缺陷范围等参数对钢管混凝土构件抗弯刚度的影响规律。结果显示,含钢率与界面缺陷范围变化对抗弯刚度作用相反,即含钢率越高时,界面缺陷范围对构件的抗弯刚度折减影响越低;核心混凝土强度与界面缺陷范围变化对抗弯刚度作用一致,即核心混凝土强度越高,界面缺陷范围对构件的抗弯刚度折减影响也越高;最后,根据数值分析结果,得到不同缺陷范围下抗弯刚度折减系数的经验表达式。
Interfacial imperfection, commonly existing in many in-service CFST structures, is one of the most significant factors that influence the workability of concrete filled steel tube(CFST). In this study, the flexural capacities of circular CFST components with different ranges of interfacial imperfection were tested. The influences of imperfection range on the failure mode, flexural capacity, mid-span deflection and surface stress of steel tube were analyzed. The damage of the core concrete during the loading process of the specimen was monitored and detected by using acoustic emission technique, and the influence rules of interfacial imperfection on the damage of concrete and the flexural capacity of the specimen were analyzed. Based on the modification of experimental results, the finite element analysis model was established to study the influence rules of the factors such as sectional steel ratio, strength of core concrete and range of interfacial imperfection on the flexural rigidity of CFST members.The results indicate that the effects of steel ratio and range of interfacial imperfection on flexural rigidity of CFST members are opposite, that is, the higher the steel ratio is, the lower the reduction influence of flexural rigidity from interfacial imperfection is; similar effects of core concrete strength and interfacial imperfection range on flexural rigidity can be observed, that is, the higher the core concrete strength is, the higher the reduction influence of flexural rigidity from interfacial imperfection is. In addition, an empirical formula of determining the reduction factor of flexural rigidity under different interfacial imperfection range was derived.
Interfacial imperfection, commonly existing in many in-service CFST structures, is one of the most significant factors that influence the workability of concrete filled steel tube(CFST). In this study, the flexural capacities of circular CFST components with different ranges of interfacial imperfection were tested. The influences of imperfection range on the failure mode, flexural capacity, mid-span deflection and surface stress of steel tube were analyzed. The damage of the core concrete during the loading process of the specimen was monitored and detected by using acoustic emission technique, and the influence rules of interfacial imperfection on the damage of concrete and the flexural capacity of the specimen were analyzed. Based on the modification of experimental results, the finite element analysis model was established to study the influence rules of the factors such as sectional steel ratio, strength of core concrete and range of interfacial imperfection on the flexural rigidity of CFST members.The results indicate that the effects of steel ratio and range of interfacial imperfection on flexural rigidity of CFST members are opposite, that is, the higher the steel ratio is, the lower the reduction influence of flexural rigidity from interfacial imperfection is; similar effects of core concrete strength and interfacial imperfection range on flexural rigidity can be observed, that is, the higher the core concrete strength is, the higher the reduction influence of flexural rigidity from interfacial imperfection is. In addition, an empirical formula of determining the reduction factor of flexural rigidity under different interfacial imperfection range was derived.
引文
[1]Liu H,Wang Y X,He M H,et al.Strength and ductility performance of concrete-filled steel tubular columns after long-term service loading[J].Engineering Structures,2015,100:308-325
[2]Hu H S,Nie J G,Wang Y H.Effective stiffness of rectangular concrete filled steel tubular members[J].Journal of Constructional Steel Research,2016,116:233-246
[3]Han L H,Li W,Bjorhovde R.Developments and advanced applications of concrete filled steel tubular(CFST)structures:members[J].Journal of Constructional Steel Research,2014,100:211-228
[4]Pi Y L,Liu C Y,Bradford M A,et al.In-plane strength of concrete-filled steel tubular circular arches[J].Journal of Constructional Steel Research,2012,69(1):77-94
[5]邓洁.季节大温差钢管混凝土温度场及轴压性能试验研究[J].四川建筑科学研究,2018,44(2):72-76(Deng Jie.Experimental study on temperature field and axial compression performance of concrete filled steel tube with large seasonal temperature difference[J].Sichuan Building Science,2018,44(2):72-76(in Chinese))
[6]祁强,张戎令,胡锐鹏,等.大温差寒冷地区钢管混凝土构件温度场分析[J].铁道建筑,2017(5):16-19(Qi Qiang,Zhang Rongling,Hu Ruipeng,et al.Analysis of temperature field of CFST members in cold area with large temperature difference[J].Railway Engineering,2017(5):16-19(in Chinese))
[7]花东强.拱桥钢管混凝土温度场分析[J].铁道建筑,2017(5):13-15(Hua Dongqiang.Concrete temperature field analysis for concrete-filled steel tubes arch bridge[J].Railway Engineering,2017(5):13-15(in Chinese))
[8]Li D S,Du F Z,Chen Z,et al.Identification of failure mechanisms for CFRP-confined circular concrete-filled steel tubular columns through acoustic emission signals[J].Smart Structures and Systems,2016,18(3):525-540
[9]Beena K,Shruti S,Sandeep S,et al.Monitoring degradation in concrete filled steel tubular sections using guided waves[J].Smart Structures and Systems,2017,19(4):371-382
[10]Chen H B,Xu B,Zhou T M,et al.Debonding detection for rectangular CFST using surface wave measurement:test and multi-physical fields numerical simulation[J].Mechanical Systems and Signal Processing,2019,117:238-254
[11]迟耀辉,郑锦兵,薛翔鸿,等.MgO钢管自应力混凝土试验研究[J].佳木斯大学学报:自然科学版,2008,26(3):289-291(Chi Yaohui,Zheng Jinbing,Xue Xianghong,et al.Experimental research on using MgOexpansion agent self-stressing concrete-filled steel tube subjected to axial compressive loading[J].Journal of Jiamusi University:Natural Science Edition,2008,26(3):289-291(in Chinese))
[12]Xu L H,Zhou P H,Chi Y,et al.Performance of the high-strength self-stressing and self-compacting concrete-filled steel tube columns subjected to the uniaxial compression[J].International Journal of Civil Engineering,2018,16(9):1069-1083
[13]鱼江英,董向前,张峰,等.用于钢管混凝土防脱黏检测的新技术[J].公路,2018(1):89-93
[14]龙刚,刘永健,朱伟庆,等.PBL加劲型矩形钢管混凝土桁架拱桥设计[J].公路交通科技,2017,34(12):51-58(Long Gang,Liu Yongjian,Zhu Weiqing,et al.Design of rectangular CFST truss arch bridge stiffened with PBL[J].Journal of Highway and Transportation Research and Development,2017,34(12):51-58(in Chinese))
[15]薛俊青,陈宝春,Briseghella B.脱黏钢管混凝土单圆管短柱偏压试验[J].建筑结构学报,2009(增2):237-241(Xue Junqing,Chen Baochun,Briseghella B.Experiment on debonding in concrete-filled steel single tube columns subjected to eccentrically loading[J].Journal of Building Structures,2009(S2):237-241(in Chinese))
[16]Xue J Q,Briseghella B,Chen B C.Effects of debonding on circular CFST stub columns[J].Journal of Constructional Steel Research,2011,69(1):64-76
[17]刘永健,李慧,张宁.界面状态对矩形钢管混凝土构件抗弯性能的影响[J].建筑科学与工程学报,2016,33(1):15-21(Liu Yongjian,Li Hui,Zhang Ning.Influence of interface state of rectangular concrete-filled steel tube on flexural performance of component[J].Journal of Architecture and Civil Engineering,2016,33(1):15-21(in Chinese))
[18]Xue J Q,Chen B C,Briseghella B.Numerical analysis of the influence of debonding on CFST single tube arch[C]//Proceedings of the 6th International Conference on Arch Bridges.Dubrovnik:Secon HDGK,2010:633-640
[19]林春姣,郑皆连,王楚杰,等.脱黏圆形钢管混凝土拱肋的极限荷载试验研究[J].广西大学学报:自然科学版,2016,41(4):1220-1227(Lin Chunjiao,Zheng Jielian,Wang Chujie,et al.Experimental study on ultimate load of debonding CFST arch rib with circular cross-section[J].Journal of Guangxi University:Natural Science Edition,2016,41(4):1220-1227(in Chinese))
[20]Huang Y H,Liu A R,Fu J Y,et al.Experimental investigation of the flexural behavior of CFST trusses with interfacial imperfection[J].Journal of Constructional Steel Research,2017,137:52-65
[21]刘铭炜,禹智涛.脱空对钢管混凝土拱桥稳定性影响分析[J].广东土木与建筑,2018,25(3):62-64(Liu Mingwei,Yu Zhitao.Analysis on the influence of disengaging on the stability of the concrete-filled steel tube arch bridge[J].Guangdong Architecture Civil Engineering,2018,25(3):62-64(in Chinese))
[22]付瑶,涂光亚.不同黏结强度对钢管初应力释放转移效率的影响[J].长沙理工大学学报:自然科学版,2018,15(1):86-91(Fu Yao,Tu Gangya.Effect of different bond strength on the release and transfer efficiency of steel tube initial stress[J].Journal of Changsha University of Science and Technology:Natural Science,2018,15(1):86-91(in Chinese))
[23]陈兵,张东,姚武,等.用AE技术研究集料尺寸对混凝土断裂性能的影响[J].建筑材料学报,1999,2(4):303-307(Chen Bing,Zhang Dong,Yao Wu,et al.Study of the influence of aggregate size on fracture properties of concrete by acoustic emission technique,1999,2(4):303-307(in Chinese))
[24]史攀飞,刘京红,杨跃飞,等.不同初始损伤混凝土单轴压缩分形特征分析[J].混凝土,2016,4:39-42(Shi Panfei,Liu Jinghong,Yang Yuefei,et al.Fractal feature of different initial damage concrete under the uniaxial compression test[J].Concrete,2016,4:39-42(in Chinese))
[25]庄茁.基于ABAQUS的有限元分析和应用[M].北京:清华大学出版社,2009
[26]Birtel V,Mark P.Parameterised finite element modelling of RC beam shear failure[C]//2006 ABAQUS User’s Conference.Hibbit,Karlsson&Sorensen Inc.,2006:95-108
[27]薛俊青.脱黏对钢管混凝土单圆管拱力学性能影响研究[D].福州:福州大学,2010(Xue Junqing.Research on the influence of debonding on the structural behavior of concrete-filled steel single tube arch[D].Fuzhou:Fuzhou University,2010(in Chinese))
[28]刘威.钢管混凝土局部受压时的工作机理研究[D].福州:福州大学,2005(Liu Wei.Research on mechanism of concrete-filled steel tubes subjected to local compression[D].Fuzhou:Fuzhou University,2005(in Chinese))
[29]刘威,韩林海.ABAQUS分析钢管混凝土轴压性能的若干问题研究[J].哈尔滨工业大学学报,2005,37(增):157-160(Liu Wei,Han Linhai.Research on some issues of ABAQUS analysis on the behavior of axially loaded concrete-filled steel tubes[J].Journal of Harbin Institute of Technology,2005,37(S):157-160(in Chinese))
[2]Hu H S,Nie J G,Wang Y H.Effective stiffness of rectangular concrete filled steel tubular members[J].Journal of Constructional Steel Research,2016,116:233-246
[3]Han L H,Li W,Bjorhovde R.Developments and advanced applications of concrete filled steel tubular(CFST)structures:members[J].Journal of Constructional Steel Research,2014,100:211-228
[4]Pi Y L,Liu C Y,Bradford M A,et al.In-plane strength of concrete-filled steel tubular circular arches[J].Journal of Constructional Steel Research,2012,69(1):77-94
[5]邓洁.季节大温差钢管混凝土温度场及轴压性能试验研究[J].四川建筑科学研究,2018,44(2):72-76(Deng Jie.Experimental study on temperature field and axial compression performance of concrete filled steel tube with large seasonal temperature difference[J].Sichuan Building Science,2018,44(2):72-76(in Chinese))
[6]祁强,张戎令,胡锐鹏,等.大温差寒冷地区钢管混凝土构件温度场分析[J].铁道建筑,2017(5):16-19(Qi Qiang,Zhang Rongling,Hu Ruipeng,et al.Analysis of temperature field of CFST members in cold area with large temperature difference[J].Railway Engineering,2017(5):16-19(in Chinese))
[7]花东强.拱桥钢管混凝土温度场分析[J].铁道建筑,2017(5):13-15(Hua Dongqiang.Concrete temperature field analysis for concrete-filled steel tubes arch bridge[J].Railway Engineering,2017(5):13-15(in Chinese))
[8]Li D S,Du F Z,Chen Z,et al.Identification of failure mechanisms for CFRP-confined circular concrete-filled steel tubular columns through acoustic emission signals[J].Smart Structures and Systems,2016,18(3):525-540
[9]Beena K,Shruti S,Sandeep S,et al.Monitoring degradation in concrete filled steel tubular sections using guided waves[J].Smart Structures and Systems,2017,19(4):371-382
[10]Chen H B,Xu B,Zhou T M,et al.Debonding detection for rectangular CFST using surface wave measurement:test and multi-physical fields numerical simulation[J].Mechanical Systems and Signal Processing,2019,117:238-254
[11]迟耀辉,郑锦兵,薛翔鸿,等.MgO钢管自应力混凝土试验研究[J].佳木斯大学学报:自然科学版,2008,26(3):289-291(Chi Yaohui,Zheng Jinbing,Xue Xianghong,et al.Experimental research on using MgOexpansion agent self-stressing concrete-filled steel tube subjected to axial compressive loading[J].Journal of Jiamusi University:Natural Science Edition,2008,26(3):289-291(in Chinese))
[12]Xu L H,Zhou P H,Chi Y,et al.Performance of the high-strength self-stressing and self-compacting concrete-filled steel tube columns subjected to the uniaxial compression[J].International Journal of Civil Engineering,2018,16(9):1069-1083
[13]鱼江英,董向前,张峰,等.用于钢管混凝土防脱黏检测的新技术[J].公路,2018(1):89-93
[14]龙刚,刘永健,朱伟庆,等.PBL加劲型矩形钢管混凝土桁架拱桥设计[J].公路交通科技,2017,34(12):51-58(Long Gang,Liu Yongjian,Zhu Weiqing,et al.Design of rectangular CFST truss arch bridge stiffened with PBL[J].Journal of Highway and Transportation Research and Development,2017,34(12):51-58(in Chinese))
[15]薛俊青,陈宝春,Briseghella B.脱黏钢管混凝土单圆管短柱偏压试验[J].建筑结构学报,2009(增2):237-241(Xue Junqing,Chen Baochun,Briseghella B.Experiment on debonding in concrete-filled steel single tube columns subjected to eccentrically loading[J].Journal of Building Structures,2009(S2):237-241(in Chinese))
[16]Xue J Q,Briseghella B,Chen B C.Effects of debonding on circular CFST stub columns[J].Journal of Constructional Steel Research,2011,69(1):64-76
[17]刘永健,李慧,张宁.界面状态对矩形钢管混凝土构件抗弯性能的影响[J].建筑科学与工程学报,2016,33(1):15-21(Liu Yongjian,Li Hui,Zhang Ning.Influence of interface state of rectangular concrete-filled steel tube on flexural performance of component[J].Journal of Architecture and Civil Engineering,2016,33(1):15-21(in Chinese))
[18]Xue J Q,Chen B C,Briseghella B.Numerical analysis of the influence of debonding on CFST single tube arch[C]//Proceedings of the 6th International Conference on Arch Bridges.Dubrovnik:Secon HDGK,2010:633-640
[19]林春姣,郑皆连,王楚杰,等.脱黏圆形钢管混凝土拱肋的极限荷载试验研究[J].广西大学学报:自然科学版,2016,41(4):1220-1227(Lin Chunjiao,Zheng Jielian,Wang Chujie,et al.Experimental study on ultimate load of debonding CFST arch rib with circular cross-section[J].Journal of Guangxi University:Natural Science Edition,2016,41(4):1220-1227(in Chinese))
[20]Huang Y H,Liu A R,Fu J Y,et al.Experimental investigation of the flexural behavior of CFST trusses with interfacial imperfection[J].Journal of Constructional Steel Research,2017,137:52-65
[21]刘铭炜,禹智涛.脱空对钢管混凝土拱桥稳定性影响分析[J].广东土木与建筑,2018,25(3):62-64(Liu Mingwei,Yu Zhitao.Analysis on the influence of disengaging on the stability of the concrete-filled steel tube arch bridge[J].Guangdong Architecture Civil Engineering,2018,25(3):62-64(in Chinese))
[22]付瑶,涂光亚.不同黏结强度对钢管初应力释放转移效率的影响[J].长沙理工大学学报:自然科学版,2018,15(1):86-91(Fu Yao,Tu Gangya.Effect of different bond strength on the release and transfer efficiency of steel tube initial stress[J].Journal of Changsha University of Science and Technology:Natural Science,2018,15(1):86-91(in Chinese))
[23]陈兵,张东,姚武,等.用AE技术研究集料尺寸对混凝土断裂性能的影响[J].建筑材料学报,1999,2(4):303-307(Chen Bing,Zhang Dong,Yao Wu,et al.Study of the influence of aggregate size on fracture properties of concrete by acoustic emission technique,1999,2(4):303-307(in Chinese))
[24]史攀飞,刘京红,杨跃飞,等.不同初始损伤混凝土单轴压缩分形特征分析[J].混凝土,2016,4:39-42(Shi Panfei,Liu Jinghong,Yang Yuefei,et al.Fractal feature of different initial damage concrete under the uniaxial compression test[J].Concrete,2016,4:39-42(in Chinese))
[25]庄茁.基于ABAQUS的有限元分析和应用[M].北京:清华大学出版社,2009
[26]Birtel V,Mark P.Parameterised finite element modelling of RC beam shear failure[C]//2006 ABAQUS User’s Conference.Hibbit,Karlsson&Sorensen Inc.,2006:95-108
[27]薛俊青.脱黏对钢管混凝土单圆管拱力学性能影响研究[D].福州:福州大学,2010(Xue Junqing.Research on the influence of debonding on the structural behavior of concrete-filled steel single tube arch[D].Fuzhou:Fuzhou University,2010(in Chinese))
[28]刘威.钢管混凝土局部受压时的工作机理研究[D].福州:福州大学,2005(Liu Wei.Research on mechanism of concrete-filled steel tubes subjected to local compression[D].Fuzhou:Fuzhou University,2005(in Chinese))
[29]刘威,韩林海.ABAQUS分析钢管混凝土轴压性能的若干问题研究[J].哈尔滨工业大学学报,2005,37(增):157-160(Liu Wei,Han Linhai.Research on some issues of ABAQUS analysis on the behavior of axially loaded concrete-filled steel tubes[J].Journal of Harbin Institute of Technology,2005,37(S):157-160(in Chinese))