主余震序列型地震动作用下RC框架结构损伤耗能研究
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摘要
强震发生后通常伴随着余震,余震的发生会加重结构损伤甚至引发倒塌。为了量化研究主余震序列型地震动对结构损伤的影响,以一栋3层钢筋混凝土框架结构为研究对象,选取了10条实际的主余震记录作为地震动输入,采用ABAQUS非线性有限元软件对该框架结构进行非线性动力时程分析,并依据结构局部和整体损伤耗能指标来评价主余震序列型地震动对框架结构累积损伤的影响。研究结果表明:序列地震会加剧结构底层柱的局部损伤耗能,特别是对底层中柱的影响更加明显;序列地震作用下的结构整体损伤耗能平均值相对于单主震作用下增加约30%;当余震与主震的第一周期谱加速度指标的比值Sa(T_1)_(余震)/Sa(T_1)_(主震)较大时,序列地震对结构损伤需求的影响更为显著。
Strong earthquakes are always followed by aftershocks which could aggravate the structural damage or even induce collapse. To quantify the effect of mainshock-aftershock sequence-type ground motions on the structural damage, a 3-story reinforced concrete(RC) frame structure is taken as the research object in this paper. For this purpose, a total number of 10 as-recorded mainshock-aftershock seismic records are selected as seismic input, and nonlinear dynamic time history analysis of the structure subjected to the seismic sequences is performed using ABAQUS software. In addition, both the local and global damage energy dissipation indices are used. The results indicate that sequence-type ground motions have a significant influence on the bottom columns, especially the middle columns, in terms of local damage energy dissipation. The global damage energy dissipation index increases by approximately 30% due to the effects of the aftershocks. When the ratio of the first-order-period spectral accelerations between the aftershock and mainshock is larger, the aftershock will induce a more demand on the structural global damage energy dissipation.
Strong earthquakes are always followed by aftershocks which could aggravate the structural damage or even induce collapse. To quantify the effect of mainshock-aftershock sequence-type ground motions on the structural damage, a 3-story reinforced concrete(RC) frame structure is taken as the research object in this paper. For this purpose, a total number of 10 as-recorded mainshock-aftershock seismic records are selected as seismic input, and nonlinear dynamic time history analysis of the structure subjected to the seismic sequences is performed using ABAQUS software. In addition, both the local and global damage energy dissipation indices are used. The results indicate that sequence-type ground motions have a significant influence on the bottom columns, especially the middle columns, in terms of local damage energy dissipation. The global damage energy dissipation index increases by approximately 30% due to the effects of the aftershocks. When the ratio of the first-order-period spectral accelerations between the aftershock and mainshock is larger, the aftershock will induce a more demand on the structural global damage energy dissipation.
引文
[1] 李宏男,肖诗云,霍林生.汶川地震震害调查与启示[J].建筑结构学报,2008,29(4):10-19.LI Hongnan,XIAO Shiyun,HUO Linsheng.Damage investigation and analysis of engineering structures in the Wenchuan earthquake[J].Journal of Building Structures,2008,29(4):10-19.(in Chinese)
[2] 张晁军,侯燕燕,胡彬,等.新西兰2010年M7.1地震与2011年M6.3地震活动和灾害分析[J].国际地震动态,2011,4:44-51.ZHANG Chaojun,HOU Yanyan,HU Bin,et al.Analysis on the seismic activities and hazards of M7.1 earthquake,2010 and M6.3 earthquake,2011 in New Zealand[J].Recent Developments in World Seismology,2011,4:44-51.(in Chinese)
[3] 曲哲,杨永强.尼泊尔自建民居在2015年地震序列中的震害[J].地震工程与工程振动.2015,35(4):51-59.QU Zhe,YANG Yongqiang.Seismic damage to owner-built dwellings in the 2015 earthquake sequence in Nepal[J].Earthquake Engineering and Engineering Dynamics,2015,35(4):51-59.(in Chinese)
[4] HATZIVASSILIOU M,HATZIGEORGIOU GD.Seismic sequence effects on three-dimensional reinforced concrete buildings[J].Soil Dynamics & Earthquake Engineering,2015,72:77-88.
[5] HOSSEINPOUR F,ABDELNABY AE.Effect of different aspects of multiple earthquakes on the nonlinear behavior of RC structures[J].Soil Dynamics & Earthquake Engineering,2017,92:706-725.
[6] 于晓辉,吕大刚,肖寒.主余震序列型地震动的增量损伤谱研究[J].工程力学,2017(3):47-53.YU Xiaohui,LV Dagang,XIAO Han.Incremental damage spectra of mainshock-aftershock sequence-type ground motions[J].Engineering Mechanics,2017(3):47-53.(in Chinese)
[7] 张沛洲,康谨之,欧进萍.主余震序列作用下钢混框架结构损伤与抗震性能分析[J].地震工程与工程振动,2014,1(3):1-8.ZHANG Peizhou,KANG Jinzhi,OU Jinping.Damage and seismic performance analysis of RC frame structures under mainshock-aftershock earthquake sequences[J].Earthquake Engineering and Engineering Dynamics,2014,1(3):1-8.(in Chinese)
[8] 李钱,吴轶,VINCENT LEE,等.基于能量及损伤的主余震地震动对超限高层结构抗震性能影响研究[J].建筑结构,2016(9):42-47.LI Qian,WU Yi,VINCENT LEE,et al.Study on the effects of main aftershock ground motions on seismic performance of high-rise structures beyond the code-specification based on energy and damage[J].Building Structure,2016,46(9):42-47.(in Chinese)
[9] 中华人民共和国住房和城乡建设部.混凝土结构设计规范GB50010-2010[M].中国建筑工业出版社,2011.Ministry of Housing and Urban-Rural Development of the People’s Republic of China.Code for Design of Concrete Structures GB50010-2010[M].China Architecture & Building Press,2011.(in Chinese)
[10] 王中强,余志武.基于能量损失的混凝土损伤模型[J].建筑材料学报,2004,7(4):365-369.WANG Zhongqiang,YU Zhiwu.Concrete damage model based on energy loss[J].Journal of Building Materials,2004,7(4):365-369.(in Chinese)
[11] 孙治国,王东升,郭迅,等.钢筋混凝土墩柱等效塑性铰长度研究[J].中国公路学报,2011,24(5):56-64.SUN Zhiguo,WANG Dongsheng,GUO Xun,et al.Research on equivalent plastic hinge length of reinforcedconcrete bridge column[J].China Journal of Highway and Transport,2011,24(5):56-64.(in Chinese)
[2] 张晁军,侯燕燕,胡彬,等.新西兰2010年M7.1地震与2011年M6.3地震活动和灾害分析[J].国际地震动态,2011,4:44-51.ZHANG Chaojun,HOU Yanyan,HU Bin,et al.Analysis on the seismic activities and hazards of M7.1 earthquake,2010 and M6.3 earthquake,2011 in New Zealand[J].Recent Developments in World Seismology,2011,4:44-51.(in Chinese)
[3] 曲哲,杨永强.尼泊尔自建民居在2015年地震序列中的震害[J].地震工程与工程振动.2015,35(4):51-59.QU Zhe,YANG Yongqiang.Seismic damage to owner-built dwellings in the 2015 earthquake sequence in Nepal[J].Earthquake Engineering and Engineering Dynamics,2015,35(4):51-59.(in Chinese)
[4] HATZIVASSILIOU M,HATZIGEORGIOU GD.Seismic sequence effects on three-dimensional reinforced concrete buildings[J].Soil Dynamics & Earthquake Engineering,2015,72:77-88.
[5] HOSSEINPOUR F,ABDELNABY AE.Effect of different aspects of multiple earthquakes on the nonlinear behavior of RC structures[J].Soil Dynamics & Earthquake Engineering,2017,92:706-725.
[6] 于晓辉,吕大刚,肖寒.主余震序列型地震动的增量损伤谱研究[J].工程力学,2017(3):47-53.YU Xiaohui,LV Dagang,XIAO Han.Incremental damage spectra of mainshock-aftershock sequence-type ground motions[J].Engineering Mechanics,2017(3):47-53.(in Chinese)
[7] 张沛洲,康谨之,欧进萍.主余震序列作用下钢混框架结构损伤与抗震性能分析[J].地震工程与工程振动,2014,1(3):1-8.ZHANG Peizhou,KANG Jinzhi,OU Jinping.Damage and seismic performance analysis of RC frame structures under mainshock-aftershock earthquake sequences[J].Earthquake Engineering and Engineering Dynamics,2014,1(3):1-8.(in Chinese)
[8] 李钱,吴轶,VINCENT LEE,等.基于能量及损伤的主余震地震动对超限高层结构抗震性能影响研究[J].建筑结构,2016(9):42-47.LI Qian,WU Yi,VINCENT LEE,et al.Study on the effects of main aftershock ground motions on seismic performance of high-rise structures beyond the code-specification based on energy and damage[J].Building Structure,2016,46(9):42-47.(in Chinese)
[9] 中华人民共和国住房和城乡建设部.混凝土结构设计规范GB50010-2010[M].中国建筑工业出版社,2011.Ministry of Housing and Urban-Rural Development of the People’s Republic of China.Code for Design of Concrete Structures GB50010-2010[M].China Architecture & Building Press,2011.(in Chinese)
[10] 王中强,余志武.基于能量损失的混凝土损伤模型[J].建筑材料学报,2004,7(4):365-369.WANG Zhongqiang,YU Zhiwu.Concrete damage model based on energy loss[J].Journal of Building Materials,2004,7(4):365-369.(in Chinese)
[11] 孙治国,王东升,郭迅,等.钢筋混凝土墩柱等效塑性铰长度研究[J].中国公路学报,2011,24(5):56-64.SUN Zhiguo,WANG Dongsheng,GUO Xun,et al.Research on equivalent plastic hinge length of reinforcedconcrete bridge column[J].China Journal of Highway and Transport,2011,24(5):56-64.(in Chinese)