水平地震作用下钢筋混凝土平面框架弯矩调幅研究
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摘要
从承载能力极限状态的角度出发,通过一个受水平集中力的单层单跨框架模型,研究了钢筋混凝土平面框架结构在水平地震作用下的破坏规律。研究结果表明,在水平力作用下,框架梁端屈服将导致框架柱底端弯矩急剧增大,平面框架结构将提前屈服。这表明框架梁的弯曲刚度对框架的承载力有显著的影响,梁端弯矩调幅将降低平面框架结构的承载力。另一方面,框架梁端屈服以后框架结构的侧移将迅速增长。在水平地震作用下,梁端弯矩调幅将增大框架结构倒塌的风险,结构偏于不安全。当按照《建筑抗震设计规范》(GB 50011—2001)进行设计时,在保证形成"强柱弱梁"破坏机制的前提下,钢筋混凝土平面框架结构不应进行弯矩调幅。
Based on the limit state of bearing capacity,a single-story and singl-span plane frame model was built to simulate the failure of RC plane frame structures under horizontal earthquake action.The structural mechanics analysis shows that the bending moment of column end increases sharply once the beam end fails.As a result,the plane frame structure fails in advance.It indicates that the bending stiffness of beam influences the bearing capacity of of the frame significantly.So the moment modulation method decreases the bearing capacity of plane frame structure under horizontal force.On the other hand,the drift of plane structure increases sharply once the beam end fails.So moment modulation method rises the risk of collapse of plane frame structures under horizontal earthquake action.According to the provisions of the Code for Seismic Design of Buildings(GB 50011—2001),for a strong-column and weak-beam RC plane frame structure,the moment modulation method should not be used under horizontal earthquake action.
Based on the limit state of bearing capacity,a single-story and singl-span plane frame model was built to simulate the failure of RC plane frame structures under horizontal earthquake action.The structural mechanics analysis shows that the bending moment of column end increases sharply once the beam end fails.As a result,the plane frame structure fails in advance.It indicates that the bending stiffness of beam influences the bearing capacity of of the frame significantly.So the moment modulation method decreases the bearing capacity of plane frame structure under horizontal force.On the other hand,the drift of plane structure increases sharply once the beam end fails.So moment modulation method rises the risk of collapse of plane frame structures under horizontal earthquake action.According to the provisions of the Code for Seismic Design of Buildings(GB 50011—2001),for a strong-column and weak-beam RC plane frame structure,the moment modulation method should not be used under horizontal earthquake action.
引文
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[14]刘红梁,高洁.讨论规范中的几个概念设计问题[J].结构工程师,2009,25(3):24-25.Lu H L,Gao J.Discussion on several conceptualdesign questions in codes[J].Structural Engineers,2009,25(3):24-28.(in Chinese)
[2]中华人民共和国建设部.JGJ 3—2002高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社,2002.Ministry of Housing and Urban-Rural Development ofthe People’s Republic of China.JGJ 3—2002Technical specification for concrete structures of tallbuilding[S].Beijing:China Architecture&BuildingPress,2002.(in Chinese)
[3]中华人民共和国建设部.GB 50010—2002混凝土结构设计规范[S].北京:中国建筑工业出版社,2002.Ministry of Housing and Urban-Rural Development ofthe People’s Republic of China.GB 50010—2002Code for Design of concrete structures[S].Beijing:China Architecture&Building Press,2002.(inChinese)
[4]王亚勇,戴国莹.建筑抗震设计规范疑问解答[M].北京:中国建筑工业出版社,2006.Wang Y Y,Dai G Y.Answers to the questions of codefor seismic design of building[M].Beijing:ChinaArchitecture&Building Press,2006.(in Chinese)
[5]龙驭球,包世华.结构力学教程(Ⅰ)[M].北京:高等教育出版社,2003.Long Y Q,Bao S H.Structureal mechanics tutorial(Ⅰ)[M].Beijing:Higher Education Press,2003.(inChinese)
[6]陈才堡.钢筋混凝土框架梁弯矩调幅方法的研究[J].建筑结构,2005,35(4):7-9.Chen C B.Plastic design through the method ofadjusting bending moment on RC frame beams[J].Building Structures,2005,35(4):7-9.(in Chinese)
[7]陈青来.钢筋混凝土结构平法设计与施工规则[M].北京:中国建筑工业出版社,2007.Chen Q L.PIEM design and construction rules ofreinforced concrete structure[M].Beijing:ChinaArchitecture&Building Press,2007.(in Chinese)
[8]方鄂华,钱稼茹,叶列平.高层建筑结构设计[M].北京:中国建筑工业出版社,2005.Fang E H,Qian J R,Ye L P.Structural design of tallbuilding[M].Beijing:China Architecture&BuildingPress,2005.(in Chinese)
[9]中华人民共和国建设部.GB 50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.Ministry of Housing and Urban-Rural Development ofthe People’s Republic of China.GB 50011—2001Code for Seismic Design of Building[S].Beijing:China Architecture&Building Press,2001.(inChinese)
[10]韦锋,杨红,白绍良.对我国不同烈度区钢筋混凝土框架现行抗震规定的初步验证[J].重庆建筑大学学报,2001,23(6):1-9.Wei F,Yang H,Bai S L.Calibration of seismicprovisions for RC frames in different earthquake-intensity regions in China[J].Journal of ChongqingJianzhu University,2001,23(6):1-9.(in Chinese)
[11]宣纲,顾祥林,吕西林.强震作用下混凝土框架结构倒塌过程的数值分析[J].地震工程与工程振动,2003,23(6):24-30.Xuan G,GU X L,Lv X L.Numerical analysis ofcollapse process for RC frame structures subjected tostrong earthquakes[J].Earthquake Engineering andEngineering Vibration,2003,23(6):24-30.(inChinese)
[12]叶列平,曲哲,陆新征,等.提高建筑结构抗地震倒塌能力的设计思想与方法[J].建筑结构学报,2008,29(4):42-50.Ye L P,Qu Z,Lu X Z,et al.Collapse prevention ofbuilding structures:a lesson from the Wenchuanearthquake[J].Journal of Building Structures,29(4):42-50.(in Chinese)
[13]徐有邻,王晓锋,刘刚,等.混凝土结构理论发展及规范修订的建议[J].建筑结构学报,2007,28(1):1-6.Xu Y L,Wang X F,Liu G,et al.The proposal ofconcrete structure theory development and codeamendment[J].Journal of Building Structures,2007,28(1):1-6.(in Chinese)
[14]刘红梁,高洁.讨论规范中的几个概念设计问题[J].结构工程师,2009,25(3):24-25.Lu H L,Gao J.Discussion on several conceptualdesign questions in codes[J].Structural Engineers,2009,25(3):24-28.(in Chinese)
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