多遇地震作用下钢支撑对RC框架结构的影响研究
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摘要
为揭示钢支撑对RC框架结构的影响规律,在4、8、12层RC框架结构上后加V型、对角型、X型及大型四种钢支撑,通过ETABS建立结构模型并进行多遇地震作用下的分析。结果表明,钢支撑改变了原结构的变形特性,使结构的刚度、楼层剪力及边柱轴力增大,中柱轴力降低。此外,钢支撑作为主要的抗侧力构件,承担了大部分地震作用,改变了原结构的传力路径,使梁端弯矩降低、梁轴力增大,与支撑相连的基础反力也相应增大。
For the purpose of revealing the effect rule of steel brace on RC frames,four shapes of steel brace,i.e.V-shape,diagonal-shape,X-shape and large one,are applied in RC frames on the 4F,8F and 12F respectively to build structural model and conduct effect analysis under frequently occurred earthquake circumstance through ETABS.The results show that the steel brace changes the deformation characteristics of the original structure,increases its rigidity,storey shear force and shaft force of the side pillar and decreases shaft force of the center pillar.Furthermore,as a major lateral resisting element,the steel brace changes the force-transferring path of the original structure,lowers the bending moment of beam end and increases beam's shaft force,thus foundation reaction connecting with brace increases accordingly.
For the purpose of revealing the effect rule of steel brace on RC frames,four shapes of steel brace,i.e.V-shape,diagonal-shape,X-shape and large one,are applied in RC frames on the 4F,8F and 12F respectively to build structural model and conduct effect analysis under frequently occurred earthquake circumstance through ETABS.The results show that the steel brace changes the deformation characteristics of the original structure,increases its rigidity,storey shear force and shaft force of the side pillar and decreases shaft force of the center pillar.Furthermore,as a major lateral resisting element,the steel brace changes the force-transferring path of the original structure,lowers the bending moment of beam end and increases beam's shaft force,thus foundation reaction connecting with brace increases accordingly.
引文
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[4]李中军,张金库,宋环宇.某高校行政主楼加固设计[J].结构工程师,2010,4(2):146-149.
[5]吴清波.上海中奥电梯研发中心结构加层设计与施工关键技术研究[J].结构工程师,2010,8(4):120-124.
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[7]H.Ghaffarzadeh,Mahmoud R.Maheri,Capacity in-teraction between the steel bracing and concrete frame[C].The7th International Congress on Civil Engineering.Istan-bul,Turkey,2006.
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[9]范苏榕.钢支撑加固钢筋混凝土框架结构的试验研究[D].南京:南京工业大学,2002.
[10]A.Massumi,A.A.Tasnimi,Strengthening of low ductile reinforced concrete frames using steel X-bracings with different details[C].The14th World Conference on Earthquake Engineering,Beijing,China,2008.
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[13]中华人民共和国住房和城乡建设部,中华人民共和国国家质量监督检验检疫总局.GB50017-2003钢结构设计规范[S].北京:中国建筑工业出版社,2003.
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