偏心受拉转换梁的“强剪弱弯”设计可靠度分析
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摘要
为实现钢筋混凝土斜柱式或斜撑式转换结构构件"强剪弱弯"的概念设计,保证斜柱或斜撑与框支柱之间的转换梁在偏心受拉状态下的"强剪弱弯"设计,采用可靠度的Monte Carlo分析方法,把转换梁看作由偏心受拉破坏与受剪破坏组成的串联体系,对按现行建筑结构规范设计的钢筋混凝土转换梁在偏心受拉状态下的"强剪弱弯"抗震可靠性进行了分析,研究了不同荷载比值(地震作用与自重荷载比值)、不同截面、材料强度等级和不同配筋率对偏心受拉梁"强剪弱弯"可靠度的影响。在此基础上,针对一、二级抗震等级偏心受拉转换梁"强剪弱弯"的设计,对目标可靠指标的剪切增强系数进行了校核,为合理地确定剪切增强系数提供参考。
In order to realize the design concept of "strong shear weak bending" for the transfer members of the reinforced concrete transfer structure with inclined column or haunching brace,and ensure "strong shear weak bending" for the transfer beam under eccentric tension and between the inclined column or haunching brace and the transfer column,using Monte Carlo method for reliability analysis and taking the transfer beams as a connected system of eccentric tensile failure and shear failure,the "strong shear weak bending" seismic reliability analysis is carried out for reinforced concrete transfer beams which are under eccentric tension and designed according to the current building code.The influence of different load ratios such as the ratio of seismic action and gravity load,different sections,different grades of material and different reinforcement ratios on the reliability of beams under eccentric tension are discussed.For the transfer beams under eccentric tension and designed according to "strong shear weak bending" rule based on first and second seismic grades,the target reliability index for shear enhancement factor is checked to provide references for reasonable analysis.
In order to realize the design concept of "strong shear weak bending" for the transfer members of the reinforced concrete transfer structure with inclined column or haunching brace,and ensure "strong shear weak bending" for the transfer beam under eccentric tension and between the inclined column or haunching brace and the transfer column,using Monte Carlo method for reliability analysis and taking the transfer beams as a connected system of eccentric tensile failure and shear failure,the "strong shear weak bending" seismic reliability analysis is carried out for reinforced concrete transfer beams which are under eccentric tension and designed according to the current building code.The influence of different load ratios such as the ratio of seismic action and gravity load,different sections,different grades of material and different reinforcement ratios on the reliability of beams under eccentric tension are discussed.For the transfer beams under eccentric tension and designed according to "strong shear weak bending" rule based on first and second seismic grades,the target reliability index for shear enhancement factor is checked to provide references for reasonable analysis.
引文
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[17]马宏旺.钢筋混凝土柱“强剪弱弯”设计可靠度分析[J].水利学报,2002,33(4):88-96.
[2]李欣荣.建筑结构可靠度影响因素综述[J].广西大学学学报:自然科学版,2005,30(S):160-163.
[3]KARAMCHANDANI A,COMELL C A.Adaptive hybrid conditional expectation approaches for reliability estimation[J].Structural Safety,1991,11(1):59-74.
[4]AU S K,BECK J L.A new adaptive importance sampling scheme for reliability calculations[J].Structural Safety,1999,21(2):135-158.
[5]BILAL M A,ACHINTYA M.Practical structural reliability techniques[J].J Struct Eng,1984,110(8):1707-1724.
[6]陆立新,吴斌,欧进萍.结构动力可靠度重要抽样法的探讨[J].世界地震工程,2007,23(3):74-78.
[7]刘颖,杨绿峰,莫远昌.基于随机响应面法的结构可靠度研究[J].广西大学学学报:自然科学版,2008,33(4):366-369.
[8]HARBITZ A.An efficient sampling-an iterative fast Monte Carlo procedure[J].Structural Safety,1986,3(2):109-115.
[9]ELLINGWOOD B R.Statistical analysis of RC beam-column interaction[J].Journal of the Structural Division,1977,103:1377-1387.
[10]ISRAEL M,ELLINGWOOD B R.Reliability-based code formulations for reliability concrete buildings[J].Journal ofStructural Engineering,1987,113(10):2235-2252.
[11]管品武,陈萌,邹银生.混凝土框架柱抗剪承载力计算公式的可靠度分析探讨[J].世界地震工程,2004,20(4):59-63.
[12]韦柳梅,陆勇,牛淼,等.结构可靠度研究[J].广西大学学学报:自然科学版,2006,31(S):280-282.
[13]吴飞.产生随机数的几种方法及其运用[J].数值计算与计算机应用,2006,27(1):48-51.
[14]刘国良,高小鹏.Freeswan IKE伪随机数算法效率分析及改进[J].计算机工程,2005,31(16):83-85.
[15]肖祖辉.转换梁按偏心受拉构件设计的可靠度研究[D].广州:华南理工大学土木与交通学院,2009.
[16]欧进萍,段宇博.高层建筑结构的抗震可靠度分析与优化设计[J].地震工程与工程振动,1995,15(1):1-13.
[17]马宏旺.钢筋混凝土柱“强剪弱弯”设计可靠度分析[J].水利学报,2002,33(4):88-96.
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