竖向不规则结构Pushover分析的侧向荷载分布模式研究
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摘要
侧向荷载分布模式的选取是Pushover分析中的一个关键问题,尤其当高振型影响显著和结构不规则时其选取直接影响Pushover分析结果。针对竖向不规则多高层结构楼层侧向刚度突变的特点,从楼层质量、侧向刚度、振型参与系数等影响因素出发,提出了一种改进的固定侧向荷载分布模式。对四种竖向不规则形式的结构在不同侧向荷载分布模式下进行Pushover分析,并与时程分析结果进行比较,研究了不同侧向荷载分布模式Pushover分析结果的有效性和适用性。计算结果表明,采用改进的侧向荷载分布模式进行Pushover分析,不但可以找出各种竖向刚度不规则形式的结构薄弱层,而且还具有较高的精度。
It is a key stage to select proper lateral load patterns in pushover analysis,especially when higher modes influence is important and the structure form is irregular.A simple fixed lateral load pattern was developed based on some important factors,such as story weight,story lateral stiffness and mode participation ratio,in which the particularity of irregular structure can be considered.Several common lateral patterns used in the pushover procedure were verified to be valid and applicable,according to the results of the nonlinear dynamic analysis for four types of vertically irregular structures.It was indicated that the soft story can be detected accurately through the proposed fixed lateral load pattern.
It is a key stage to select proper lateral load patterns in pushover analysis,especially when higher modes influence is important and the structure form is irregular.A simple fixed lateral load pattern was developed based on some important factors,such as story weight,story lateral stiffness and mode participation ratio,in which the particularity of irregular structure can be considered.Several common lateral patterns used in the pushover procedure were verified to be valid and applicable,according to the results of the nonlinear dynamic analysis for four types of vertically irregular structures.It was indicated that the soft story can be detected accurately through the proposed fixed lateral load pattern.
引文
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[9]熊向阳,戚震华.侧向荷载分布模式对静力弹塑性分析结果的影响[J].建筑科学,2001,17(5):8-13.
[10]侯爽,欧进萍.结构Pushover分析的侧向力分布及高阶振型影响[J].地震工程与工程振动,2004,24(3):89-97.
[2]FEMA273,FEMA274,FEMA356.NEHRP Guidelinesfor the Seismic Rehabilitation of Buildings[S].Washington DC:Federal Emergency ManagementAgency,1996.
[3]小古俊介.日本基于性能结构抗震设计方法的进展[J].建筑结构,2000,30(6):3-9.
[4]中国建筑科学研究院.GB 50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[5]Krawinklar H,Seneviratna GDPK.Pros and Cons of aPushover analysis of seismic performance evaluation[J].Engineering Structures,1998,20:452-464.
[6]Gupta B,Kunnath S K.Adaptive spectra-basedpushover procedure for seismic evaluation of structures[J].Earthquake Spectra,2000,16(2):367-391.
[7]Chopra A K,Goel R K.A modal pushover analysisprocedure for estimating seismic demands for buildings[J].Earthquake Engineering and StructuralDynamics,2002,31(3):561-582.
[8]Requena M.Evaluation of a Simplified Method for theDetermination of the Nonlinear Seismic Response ofRC Frames[C]∥12WCEE,2000.
[9]熊向阳,戚震华.侧向荷载分布模式对静力弹塑性分析结果的影响[J].建筑科学,2001,17(5):8-13.
[10]侯爽,欧进萍.结构Pushover分析的侧向力分布及高阶振型影响[J].地震工程与工程振动,2004,24(3):89-97.
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