钢筋归并对钢筋混凝土框架结构超强特性的影响
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摘要
按照现行中国抗震设计规范设计了多种层数的钢筋混凝土框架结构,设计中考虑了钢筋的各种归并方案.采用静力弹塑性方法计算了结构的超强系数,分析了结构层数和钢筋归并系数与结构超强性能的关系.超强系数随结构层数的增加而减小,随着钢筋归并系数的增大而增大,在低层结构中归并程度对超强的影响较高层结构更为明显.目前我国抗震规范中地震作用的取值,应该考虑超强在各种因素下的变化而进行相应的修订.
Several reinforced concrete frame structures with different stories were designed according to the current Chinese seismic code,in which several schemes of reinforcement mergence were taken into account.The overstrength factor of each structure was calculated by static elastoplastic method.Analysis on the relation of the overstrength factor to the number of stories and the mergence factor show that the overstrength factor decreases with the number of stories increasing but increases with the mergence factor enlarging.The effect of mergence on overstrength is more obvious in low structures than that in high structures.The current Chinese seismic code needs to be revised to consider every factor influencing the overstrength of structures.
Several reinforced concrete frame structures with different stories were designed according to the current Chinese seismic code,in which several schemes of reinforcement mergence were taken into account.The overstrength factor of each structure was calculated by static elastoplastic method.Analysis on the relation of the overstrength factor to the number of stories and the mergence factor show that the overstrength factor decreases with the number of stories increasing but increases with the mergence factor enlarging.The effect of mergence on overstrength is more obvious in low structures than that in high structures.The current Chinese seismic code needs to be revised to consider every factor influencing the overstrength of structures.
引文
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[2]Zhou X Y,Zeng D M,Gao X A.Simplified method forevaluating seismic design intensities structures with vari-ous service periods.Build Struct,2002,32(1):37(周锡元,曾德民,高晓安.估计不同服役期结构的抗震设计设防水准的简单方法.建筑结构,2002,32(1):37)
[3]Ma Y H,Xie L L.Determination of frequently occurredand seldomly occurred earthquakes in consideration ofearthquake environment.J Build Struct,2002,23(1):43(马玉宏,谢礼立.考虑地震环境的设计常遇地震和罕遇地震的确定.建筑结构学报,2002,23(1):43)
[4]Shen J W,Cai C Q.Rotational components of earthquakeground motions.Earthquake Eng Eng Vib,1997,17(2):27(沈建文,蔡长青.地震危险性分析与抗震设防标准的确定.地震工程与工程振动,1997,17(2):27)
[5]Yang Y,Bai S L.Issues on reliability level of China seismicdesign code of buildings by comparison with other coun-tries.J Chongqing Archit Univ,2000,22(Supp l):192(杨媛,白绍良.从各国规范对比看我国抗震设计安全水准评价中的有关问题.重庆建筑大学学报,2000,22(增刊1):192)
[6]Mwafy A M,Elnashai A S.Calibration of force reductionfactors of RC buildings.J Earthquake Eng,2002,6(2):239
[7]Balendra T,Tan K H,Kong S K.Vulnerability of rein-forced concrete frames in low seismic region,when de-signed according to BS 8110.Earthquake Eng Struct Dyn,1999,28(3):1361
[8]Elnashai A S,Mwafy A M.Overstrength and force reduc-tion factors of multistorey reinforced-concrete buildings.Struct Des Tall Build,2002,11(5):329
[9]Zhao F L.Research on Overstrength Factors ofReinforced-concrete Frame Structures[Dissertation].Xi’an:Xi’an University of Architecture and Technology,2008(赵风雷.钢筋混凝土框架结构超强系数的研究[学位论文].西安:西安建筑科技大学,2008)
[10]Zhang L H.Analysis on Overstrength Factors ofReinforced Concrete Frame Structures[Dissertation].Chongqing:Chongqing University,2009(张连河.钢筋混凝土框架结构超强系数分析[学位论文].重庆:重庆大学,2009)
[11]Liu L H.Preliminary Analysis of R-μRelationships ofMDOF and Influence of the Degree of Statical Inde-terminacy on Overstrength[Dissertation].Chongqing:Chongqing University,2007(刘兰花.多自由度体系R-μ规律初步分析及超静定次数对结构超强的影响[学位论文].重庆:重庆大学,2007)
[12]Yang H,Wu J J,Wang Z J.Analyses of nonlinear modelsfor the seismic responses of RC frames.Earthquake EngEng Vib,2008,28(2):20(杨红,吴晶晶,王志军.模型化方法对钢筋混凝土框架地震反应的影响分析.地震工程与工程振动,2008,28(2):20)
[2]Zhou X Y,Zeng D M,Gao X A.Simplified method forevaluating seismic design intensities structures with vari-ous service periods.Build Struct,2002,32(1):37(周锡元,曾德民,高晓安.估计不同服役期结构的抗震设计设防水准的简单方法.建筑结构,2002,32(1):37)
[3]Ma Y H,Xie L L.Determination of frequently occurredand seldomly occurred earthquakes in consideration ofearthquake environment.J Build Struct,2002,23(1):43(马玉宏,谢礼立.考虑地震环境的设计常遇地震和罕遇地震的确定.建筑结构学报,2002,23(1):43)
[4]Shen J W,Cai C Q.Rotational components of earthquakeground motions.Earthquake Eng Eng Vib,1997,17(2):27(沈建文,蔡长青.地震危险性分析与抗震设防标准的确定.地震工程与工程振动,1997,17(2):27)
[5]Yang Y,Bai S L.Issues on reliability level of China seismicdesign code of buildings by comparison with other coun-tries.J Chongqing Archit Univ,2000,22(Supp l):192(杨媛,白绍良.从各国规范对比看我国抗震设计安全水准评价中的有关问题.重庆建筑大学学报,2000,22(增刊1):192)
[6]Mwafy A M,Elnashai A S.Calibration of force reductionfactors of RC buildings.J Earthquake Eng,2002,6(2):239
[7]Balendra T,Tan K H,Kong S K.Vulnerability of rein-forced concrete frames in low seismic region,when de-signed according to BS 8110.Earthquake Eng Struct Dyn,1999,28(3):1361
[8]Elnashai A S,Mwafy A M.Overstrength and force reduc-tion factors of multistorey reinforced-concrete buildings.Struct Des Tall Build,2002,11(5):329
[9]Zhao F L.Research on Overstrength Factors ofReinforced-concrete Frame Structures[Dissertation].Xi’an:Xi’an University of Architecture and Technology,2008(赵风雷.钢筋混凝土框架结构超强系数的研究[学位论文].西安:西安建筑科技大学,2008)
[10]Zhang L H.Analysis on Overstrength Factors ofReinforced Concrete Frame Structures[Dissertation].Chongqing:Chongqing University,2009(张连河.钢筋混凝土框架结构超强系数分析[学位论文].重庆:重庆大学,2009)
[11]Liu L H.Preliminary Analysis of R-μRelationships ofMDOF and Influence of the Degree of Statical Inde-terminacy on Overstrength[Dissertation].Chongqing:Chongqing University,2007(刘兰花.多自由度体系R-μ规律初步分析及超静定次数对结构超强的影响[学位论文].重庆:重庆大学,2007)
[12]Yang H,Wu J J,Wang Z J.Analyses of nonlinear modelsfor the seismic responses of RC frames.Earthquake EngEng Vib,2008,28(2):20(杨红,吴晶晶,王志军.模型化方法对钢筋混凝土框架地震反应的影响分析.地震工程与工程振动,2008,28(2):20)
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