框架结构底层薄弱震害分析和改进措施研究
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摘要
通过对汶川、玉树、芦山地震中几组框架结构的典型破坏案例的分析对比,指出了产生框架结构底层薄弱的层屈服机制的主要原因和破坏过程,并提出了在框架结构中增设阶梯墙的加固改进方案。分别采用推覆分析方法和基于IDA的结构倒塌储备系数分析方法对一个典型框架结构和一个阶梯墙框架结构进行了分析研究。计算分析结果表明,阶梯墙在结构的整体承载力储备和变形能力,冗余度和整体性,以及合理的屈服机制三个层面上均能对框架结构的抗地震倒塌能力起到很好的改进作用。
The main reason and failure process of the bottom yielding mechanism of RC frame structure are pointed out through some typical damaged structures in the Wenchuan,Yushu and Lushan earthquakes.Strengthening method of adding the stepped wall into the RC frame is proposed.The collapse resistance of an ordinary RC frame and a stepped wall-frame structure is analyzed with pushover analysis and collapse margin ratio analysis,which is based on incremental dynamic analysis.The study proves that the stepped wall can improve the collapse resistance of RC frame in the global loading resistance,lateral deformation,redundancy and rational yield mechanism.
The main reason and failure process of the bottom yielding mechanism of RC frame structure are pointed out through some typical damaged structures in the Wenchuan,Yushu and Lushan earthquakes.Strengthening method of adding the stepped wall into the RC frame is proposed.The collapse resistance of an ordinary RC frame and a stepped wall-frame structure is analyzed with pushover analysis and collapse margin ratio analysis,which is based on incremental dynamic analysis.The study proves that the stepped wall can improve the collapse resistance of RC frame in the global loading resistance,lateral deformation,redundancy and rational yield mechanism.
引文
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[2]孙景江,马强,石宏彬,等.汶川地震高烈度区城镇房屋震害简介[J].地震工程与工程振动,2008,28(3):7-15.SUN Jingjiang,MA Qiang,SHI Hongbin,et al.Building damage in cities and towns located in higher intensity areas during Wenchuan earthquake[J].Journal of Earthquake Engineering and Engineering Vibration,2008,28(3):7-15.(in Chinese)
[3]孙景江,唐玉红,孙忠贤.汶川地震Ⅷ度和Ⅶ度区城市房屋震害及若干典型震害讨论[J].地震工程与工程振动,2009,29(6):65-73.SUN Jingjiang,TANG Yuhong,SUN Zhongxian,et al.Damage to urban buildings in zones with intensityⅧorⅦduring Wenchuan earthquake and discussions on some typical damage[J].Journal of Earthquake Engineering and Engineering Vibration,2009,29(6):65-73.(in Chinese)
[4]易伟建,张颖.混凝土框架结构抗震设计的弯矩增大系数[J].建筑科学与工程学报,2006,23(2):46-51.YI Weijian,ZHANG Ying.Moment magnification factor in anti-seismic design of concrete frame structure[J].Journal of Architecture and Civil Engineering,2006,23(2):46-51.(in Chinese)
[5]叶列平,马千里,缪志伟.钢筋混凝土框架结构强柱弱梁设计方法的研究[J].工程力学,2010,27(12):102-113.YE Lieping,MA Qianli,MIAO Zhiwei.Study on weak beam-strong column design method of RC frame structures[J].Engineering Mechanics,2010,27(12):102-113.(in Chinese)
[6]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.HOU Shuang,OU Jinping.A study of load pattern selection of pushover analysis and influence of higher modes[J].Journal of Earthquake Engineering and Engineering Vibration,2004,24(3):89-97.(in Chinese)
[7]翟长海,谢礼立.钢筋混凝土框架结构超强研究[J].建筑结构学报,2007,28(1):101-106.ZHAI Changhai,XIE Lili.Study on overstrength of RC frame structures[J].Journal of Building Structures,2007,28(1):101-106.(in Chinese)
[8]吕大刚,于晓辉,王光远.基于单地震动记录IDA方法的结构倒塌分析[J].地震工程与工程振动,2009,29(6):33-39.LV Dagang,YU Xiaohui,WANG Guangyuan.Structural collapse analysis based on single-record IDA method[J].Journal of Earthquake Engineering and Engineering Vibration,2009,29(6):33-39.(in Chinese)
[9]叶列平,陆新征,赵世春,等.框架结构抗地震倒塌能力的研究——汶川地震极震区几个框架结构震害案例分析[J].建筑结构学报,2009,30(6):67-76.YE Lieping,LU Xinzheng,ZHAO Shichun,et al.Seismic collapse resistance of RC frame structures——Case studies on seismic damages of several RC frame structures under extreme ground motion in Wenchuan Earthquake[J].Journal of Building Structures,2009,30(6):67-76.(in Chinese)
[10]Park YJ,Reinborn AM,Kunnath SK.IDARC:inelastic damage analysis of reinforced concrete frame-shear-wall structures[R].Technical Report NCEER-87-0008,State University of New York at Buffalo,1987.
[11]Valles RE,Reinborn AM,Kunnath SK,et al.IDARC 2D version4.0:a program for the inelastic damage analysis of buildings[R].Technical Report NCEER-96-0010,State University of New York,Buffalo,1996.
[12]FEMA P695 Quantification of Building Seismic Performance Factors[S].Applied Technology Council,2009.
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