基于增量动力分析的钢框架-混凝土剪力墙结构地震易损性
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摘要
易损性是结构本身的一个特性,是结构在不同地震强度指标作用下,达到特定失效状态或性能水平的可能性。建立钢框架-混凝土剪力墙结构的非线性分析模型,采用增量动力分析方法对结构进行地震易损性研究,提出地震需求参数与地震动强度指标之间的关系,绘制易损性曲线;并结合地震倒塌储备系数对结构的抗震能力进行定量分析。结果表明:结构在立即使用状态时,易损性曲线斜率较大,曲线较陡,说明结构在震后不需经过修理仍可使用,随着谱加速度的增大,结构的超越概率急剧上升。结构在防止倒塌和整体失稳状态时,曲线走势趋于平缓,说明结构进入弹塑性状态后,耗能能力显著增强,结构的抗震倒塌能力可以满足规范要求。倒塌储备系数与结构的倒塌能力呈正相关变化趋势。研究结果为结构的抗震及倒塌能力评估提供参考。
Seismic fragility,as a feature of the structure,is the probability to reach a specific failure state or performance level under earthquake with different intensity. The nonlinear analysis model of steel frame-concrete shear wall structure was established,and the seismic vulnerability of that was studied with the using of incremental dynamic analysis (IDA) method. The fragility curves was drawn by the analysis of the relationships between seismic demand parameters and seismic intensity index. Meanwhile,the seismic capacity of structure was quantitatively analyzed,combining the seismic collapse reserve coefficient. It is shown that the vulnerability curve is steeper and the slope of that is larger at the stage of immediate occupancy (IO),which indicated that the structure can still work without repairing after subjecting earthquake. As the increase of spectral acceleration,the exceedance probability of structure increases sharply. The trend of curve tends to be gentle at stage of collapse prevention (CP) and global instability (GI). The elastic-plastic state of structure reaches,the energy dissipation capacity of that is improved significantly and the plastic deformation of that develops rapidly until collapse happened. The collapse reserve coefficient is positively correlated with the collapse ability of the structure. Base on the method of IDA,the seismic fragility analysis can provide an effective scientific basis for evaluating the seismic collapse resistance of structure.
Seismic fragility,as a feature of the structure,is the probability to reach a specific failure state or performance level under earthquake with different intensity. The nonlinear analysis model of steel frame-concrete shear wall structure was established,and the seismic vulnerability of that was studied with the using of incremental dynamic analysis (IDA) method. The fragility curves was drawn by the analysis of the relationships between seismic demand parameters and seismic intensity index. Meanwhile,the seismic capacity of structure was quantitatively analyzed,combining the seismic collapse reserve coefficient. It is shown that the vulnerability curve is steeper and the slope of that is larger at the stage of immediate occupancy (IO),which indicated that the structure can still work without repairing after subjecting earthquake. As the increase of spectral acceleration,the exceedance probability of structure increases sharply. The trend of curve tends to be gentle at stage of collapse prevention (CP) and global instability (GI). The elastic-plastic state of structure reaches,the energy dissipation capacity of that is improved significantly and the plastic deformation of that develops rapidly until collapse happened. The collapse reserve coefficient is positively correlated with the collapse ability of the structure. Base on the method of IDA,the seismic fragility analysis can provide an effective scientific basis for evaluating the seismic collapse resistance of structure.
引文
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8李永梅,李玉占,杨博颜.基于性能的钢框架结构地震易损性分析[J].工程抗震与加固改造,2017,39(4):55-59Li Yongmei,Li Yuzhan,Yang Boyan.Performance-based seismic fragility analysis of steel frame structures[J].Earthquake Resistant Engineering and Retrofitting,2017,39(4):55-59
9施炜,叶列平,陆新征,等.不同抗震设防RC框架结构抗倒塌能力的研究[J].工程力学,2011,28(3):41-48Shi Wei,Ye Lieping,Lu Xinzheng,et al.Study on the collapse resistant capacity of RC frames with different seismic fortification levels[J].Engineering Mechanics,2011,28(3):41-48
10周燕.砖木结构1/4模型振动台试验与理论研究[D].西安:西安建筑科技大学,2007Zhou Yan.The shaking table test and theory investigation for 1/4scale half-timbered model[D].Xi'an:Xi'an University of Architecture and Technology,2007
11周云.黏弹性阻尼减震结构设计[M].武汉:武汉理工大学出版社,2006:54-56Zhou Yun.Viscoelastic damping structure design[M].Wuhan:Wuhan University of Technology Press,2006:54-56
12 Nasserasadi K,Ghafory-Ashtiany M,Eshghi S,et al.Developing seismic fragility functions of structures by stochastic approach[J].Asian Journal of Engineering(Building and Housing),2009,10(2):183-200
13 Schotanus M I J,Franchin P,Lupoi A,et al.Seismic fragility analysis of 3D Structures[J].Structural Safety,2004,26(4):421-441
14 Vamvatsikos D,Cornell C A.Incremental dynamic analysis[J].Earthquake Engineering and Structural Dynamics,2002,31(3):491-514
15 Melchers R E.Structural reliability:analysis and prediction[M].2nd ed.New York:John Wiley,1999
16 Hwang H,Liu J B,Chiu Y H,et al.Seismic fragility analysis of highway bridges[R].Urabana,U.S.:Mid-America Earthquake Center Technical,MAEC-RR-4 Project,2001
17 FEMA 695 Quantification of building seismic performance factors[S].California,U.S.:Federal Emergency Management Agency,2009
18王亚勇,高孟潭,叶列平,等.基于大震和特大震下倒塌率目标的建筑抗震设计方法研究方案[C]//第八届全国地震工程学术论文集.重庆:重庆大学期刊社,2010:191-297Wang Yayong,Gao Mengtan,Ye Lieping,et al.Research program of building seismic design method based on the target of collapse rate under large earthquakes and extreme earthquakes[C]//8th National Seismic Engineering Academic Papers Collection.Chongqing:Chongqing University Journal,2010:191-297
2吕大刚,李晓鹏,王光远.基于可靠度和性能的结构整体地震易损性分析[J].自然灾害学报,2006,15(2):107-114LüDagang,Li Xiaopeng,Wang Guangyuan.Global seismic fragility analysis of structures based on reliability and performance[J].Journal of Nature Disasters,2006,15(2):107-114
3刘晶波,刘阳冰,闫秋实.基于性能的方钢管混凝土框架结构地震易损性分析[J].土木工程学报,2010(2):39-47Liu Jingbo,Liu Yangbing,Yan Qiushi.Performance-based seismic fragility analysis of CFST frame structures[J].China Civil Engineering Journal,2010(2):39-47
4陆新征,叶列平.基于IDA分析的结构抗地震倒塌能力研究[J].工程抗震与加固改造,2010,32(1):13-18Lu Xinzheng,Ye Lieping.Study on the seismic collapse resistance of structural system[J].Earthquake Resistant Engineering and Retrofitting,2010,32(1):13-18
5吕西林,苏宁粉,周颖.复杂高层结构基于增量动力分析法的地震易损性分析[J].地震工程与工程振动,2012,32(5):19-25LüXilin,Su Ningfen,Zhou Ying.IDA-based seismic fragility analysis of a complex high-rise structure[J].Journal of Earthquake Engineering and Engineering Vibration,2012,32(5):19-25
6周奎,林杰,祝文.基于增量动力分析方法的地震易损性工程实例分析[J].地震工程与工程振动,2016,1(1):135-140Zhou Kui,Lin Jie,Zhu Wen.Case study of seismic fragility analysis based on the incremental dynamic analysis(IDA)method[J].Journal of Earthquake Engineering and Engineering Vibration,2016,1(1):135-140
7舒兴平,曹福亮,卢倍嵘,等.基于增量动力分析法的大跨度空间管桁架结构地震易损性分析[J].工业建筑,2016,46(3):108-112Shu Xingping,Cao Fuliang,Lu Beirong,et al.Seismic fragility analysis of Large-span spatial pipe-truss based on IDA method[J].Industrial Building,2016,46(3):108-112
8李永梅,李玉占,杨博颜.基于性能的钢框架结构地震易损性分析[J].工程抗震与加固改造,2017,39(4):55-59Li Yongmei,Li Yuzhan,Yang Boyan.Performance-based seismic fragility analysis of steel frame structures[J].Earthquake Resistant Engineering and Retrofitting,2017,39(4):55-59
9施炜,叶列平,陆新征,等.不同抗震设防RC框架结构抗倒塌能力的研究[J].工程力学,2011,28(3):41-48Shi Wei,Ye Lieping,Lu Xinzheng,et al.Study on the collapse resistant capacity of RC frames with different seismic fortification levels[J].Engineering Mechanics,2011,28(3):41-48
10周燕.砖木结构1/4模型振动台试验与理论研究[D].西安:西安建筑科技大学,2007Zhou Yan.The shaking table test and theory investigation for 1/4scale half-timbered model[D].Xi'an:Xi'an University of Architecture and Technology,2007
11周云.黏弹性阻尼减震结构设计[M].武汉:武汉理工大学出版社,2006:54-56Zhou Yun.Viscoelastic damping structure design[M].Wuhan:Wuhan University of Technology Press,2006:54-56
12 Nasserasadi K,Ghafory-Ashtiany M,Eshghi S,et al.Developing seismic fragility functions of structures by stochastic approach[J].Asian Journal of Engineering(Building and Housing),2009,10(2):183-200
13 Schotanus M I J,Franchin P,Lupoi A,et al.Seismic fragility analysis of 3D Structures[J].Structural Safety,2004,26(4):421-441
14 Vamvatsikos D,Cornell C A.Incremental dynamic analysis[J].Earthquake Engineering and Structural Dynamics,2002,31(3):491-514
15 Melchers R E.Structural reliability:analysis and prediction[M].2nd ed.New York:John Wiley,1999
16 Hwang H,Liu J B,Chiu Y H,et al.Seismic fragility analysis of highway bridges[R].Urabana,U.S.:Mid-America Earthquake Center Technical,MAEC-RR-4 Project,2001
17 FEMA 695 Quantification of building seismic performance factors[S].California,U.S.:Federal Emergency Management Agency,2009
18王亚勇,高孟潭,叶列平,等.基于大震和特大震下倒塌率目标的建筑抗震设计方法研究方案[C]//第八届全国地震工程学术论文集.重庆:重庆大学期刊社,2010:191-297Wang Yayong,Gao Mengtan,Ye Lieping,et al.Research program of building seismic design method based on the target of collapse rate under large earthquakes and extreme earthquakes[C]//8th National Seismic Engineering Academic Papers Collection.Chongqing:Chongqing University Journal,2010:191-297
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