型钢混凝土框架结构基于增量动力分析的抗震性能评估
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摘要
增量动力分析(IDA)是进行结构抗震性能评估的一种有效方法。根据IDA方法的原理和特点,提出用其评估型钢混凝土(SRC)结构在不同强度地震作用下变形和延性能力的具体步骤,并将结构不同性能水平极限状态和IDA曲线的斜率联系起来,结合现有试验确定各性能水准对应的曲线斜率下降幅值。在所提混凝土和钢材本构模型的基础上,采用IDA方法对一规则SRC框架结构进行分析,研究结构在各性能水平的层间位移角和延性分布情况,单条和多条地震记录的IDA曲线表明,SRC框架在多条地震记录下均具有良好的抗震性能。
Incremental dynamic analysis(IDA) is an effective method for evaluation of seismic performance of building structures.Based on the principle and characteristics of IDA method,evaluation steps for investigating deformation and ductility of steel reinforced concrete(SRC) structures under increasing earthquake loading are put forward.Limit states of different performance levels for the structures are connected with IDA curve slopes,of which the decrease amplitude is determined according to current test data.Based on the proposed constitutive model of steel and concrete,a regular steel reinforced concrete frame structure is analyzed with IDA method,and the distribution of story drift angle and ductility for four performance levels are investigated.The calculation results show that the SRC frame has better seismic performance under random earthquake waves.
Incremental dynamic analysis(IDA) is an effective method for evaluation of seismic performance of building structures.Based on the principle and characteristics of IDA method,evaluation steps for investigating deformation and ductility of steel reinforced concrete(SRC) structures under increasing earthquake loading are put forward.Limit states of different performance levels for the structures are connected with IDA curve slopes,of which the decrease amplitude is determined according to current test data.Based on the proposed constitutive model of steel and concrete,a regular steel reinforced concrete frame structure is analyzed with IDA method,and the distribution of story drift angle and ductility for four performance levels are investigated.The calculation results show that the SRC frame has better seismic performance under random earthquake waves.
引文
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[3]Bertero V V.Strength and deformation capacities of buildings under extreme environments[J].Structural Engineering and Structural Mechanics,1977,53(1):29-79.
[4]Yun S Y,Hamburger R O and Cornell C A.Seismic performance for steel moment frames[J].ASCE Journal of Structural Engineering,2002,141(1):95-102.
[5]Vamvatsikos D,Cornell C A.Incremental dynamic analysis[J].Earthquake Engineering and Structural Dynamics,2002,31(3):491-514.
[6]李玉荣.型钢混凝土梁式转换框架结构的试验和理论研究[D].杭州:浙江大学,2005.KI Yurong.Experimental and theoretical study of transferring structure for steel reinforced concrete beams[D].Hangzhou:Zhe Jiang University,2005.
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[8]FEMA.Recommended seismic evaluation and upgrade criteria for existing welded steel moment-frame Buildings[S].Report No.FEMA-351,Emergency Management Agency,Washington,D.C.,2000.
[9]薛建阳,赵鸿铁.型钢钢筋混凝土框架振动台试验及弹塑性动力分析[J].土木工程学报,2000,33(2):30-34.XUE Jianyang,ZHAO Hongtie.Shaking table experiment and elastoplastic analysis of steel reinforced concrete frame[J].China Civil EngineeringJournal,2000,33(2):30-34.
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