罕遇地震作用下直接基于位移设计的局部预应力混凝土框架目标位移控制研究
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摘要
本文针对罕遇地震作用下,直接基于位移设计的预应力混凝土框架在"防止倒塌"性能水准下结构目标位移不能有效控制的问题进行研究。通过理论分析和预应力混凝土框架结构的设计实例模拟计算,总结出影响结构目标位移有效控制的主要原因有结构承载能力超强和性能点时刻位移模式与设计位移模式误差较大两个方面。结构承载能力超强是影响框架层间位移角有效控制的主要原因,位移模式误差则是通过影响等效单自由度体系的等效目标位移而影响目标位移的有效控制。文中提出了考虑强柱弱梁调整、材料强度取值以及其他构造措施等影响的基底剪力折减计算公式,以及采用结构在性能点时刻的位移模式对设计位移模式进行修正的改进方法,算例表明目标位移和其他各项性能参数的控制均得到了非常明显的改善。
The problem that the target displacement of partially prestressed concrete frame in design directly based on displacement at performance level of "collapse prevention"can not be controlled effectively is studied.By theoretical analysis and analog computation of PPC frames,the principal factors affecting the control of target displacement can be described as: the obvious ultrastrength of bearing capacity of structures and the differnce between the displacement pattern at performance point and the design displacement pattern.The obvious ultrastrength of bearing capacity of structures is the main reason that affects the control of storey drift,and the error of the displacement pattern affects the control of target displacement by affecting equivalent target displacement in the equivalent SDOF system.The formula for calculating the reduction factor of base shear is proposed,in which strong column and weak beam adjustment,material strength value and detail measures are taken into account;also the displacement pattern of the performance point is adopted to modify the displacement pattern.It demonstrates that the control of target displacement and the other parameters are improved obviously in numerical examples.
The problem that the target displacement of partially prestressed concrete frame in design directly based on displacement at performance level of "collapse prevention"can not be controlled effectively is studied.By theoretical analysis and analog computation of PPC frames,the principal factors affecting the control of target displacement can be described as: the obvious ultrastrength of bearing capacity of structures and the differnce between the displacement pattern at performance point and the design displacement pattern.The obvious ultrastrength of bearing capacity of structures is the main reason that affects the control of storey drift,and the error of the displacement pattern affects the control of target displacement by affecting equivalent target displacement in the equivalent SDOF system.The formula for calculating the reduction factor of base shear is proposed,in which strong column and weak beam adjustment,material strength value and detail measures are taken into account;also the displacement pattern of the performance point is adopted to modify the displacement pattern.It demonstrates that the control of target displacement and the other parameters are improved obviously in numerical examples.
引文
[1]王丰,李宏男,伊廷华.改进直接基于位移的钢筋混凝土框架结构抗震设计研究[J].地震工程与工程振动,2009,29(6):130-135.WANG Feng,LI Hongnan,YI Tinghua.Improved direct displacement-based seismic design procedure[J].Journal of Earthquake Engineering andEngineering Vibration,2009,29(6):130-135.(in Chinese)
[2]Medhekar M S,Kennedy D J L.Displacement-based seismic design of buildings-theory[J].Engineering Structures,22(2000):201-209.
[3]Medhekar M S,Kennedy D J L.Displacement-based seismic design of buildings-application[J].Engineering Structures,22(2000):210-221.
[4]Priestley M J N.Direct displacement-based design of precast/prestressed concrete buildings[J].PCI Journal,2002,47(6):66-79.
[5]罗文斌,钱稼茹.钢筋混凝土框架基于位移的抗震设计[J].土木工程学报,2003,36(5):22-29.LUO Wenbin,QIAN Jiaru.Displacement-based seismic design for RC frames[J].China Civil Engineering Journal,2003,36(5):22-29.(inChinese)
[6]周定松,吕西林,蒋欢军.钢筋混凝土框架结构基于性能的抗震设计方法[J].四川建筑科学研究,2005,31(6):122-127.ZHOU Dingsong,LU Xilin,JIANG Huangjun.Performance-based seismic design method for RC frame structures[J].Building Science Researchof Sichuan,2005,31(6):122-127.(in Chinese)
[7]梁兴文,黄雅捷,杨其伟.钢筋混凝土框架结构基于位移的抗震设计方法研究[J].土木工程学报,2005,38(9):53-60.LIANG Xingwen,HUANG Yajie,YANG Qiwei.Displacement-based seismic design method of RC frames[J].China Civil Engineering Journal,2005,38(9):53-60.(in Chinese)
[8]GB50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB50011-2010 Seismic design code for buildings[S].Beijing:China Architecture Industry Press,2010.(in Chinese)
[9]简斌,翁健,金云飞.直接基于位移预应力混凝土抗震设计方法[J].工程力学,2010,27(7):205-211.JIAN Bin,WENG Jian,JIN Yunfei.Direct displacement-based seismic design for prestressed concrete frame structures[J].Engineering Mechan-ics,2010,27(7):205-211.(in Chinese)
[10]金云飞.预应力混凝土框架结构直接基于位移的抗震设计方法的研究[D].重庆:重庆大学,2010.JIN Yunfei.Study on direct displacement-based design approach of prestressed concrete frame structures for seismic resistance[D].Chongqing:Chongqing University,2010.(in Chinese)
[11]王媛.直接基于位移的PPC框架抗震设计理论及其初步应用研究[D].重庆:重庆大学,2011.WANG Yuan.Study on the theory and preliminary application of direct displacement-based seismic design approach of partially prestressed concreteframe structures[D].Chongqing:Chongqing University,2011.(in Chinese)
[12]ATC.Seismic evaluation and retrofit of concrete buildings[R].Rep.ATC-40,Applied Technology Council,Redwood City.,Calif,1996.
[2]Medhekar M S,Kennedy D J L.Displacement-based seismic design of buildings-theory[J].Engineering Structures,22(2000):201-209.
[3]Medhekar M S,Kennedy D J L.Displacement-based seismic design of buildings-application[J].Engineering Structures,22(2000):210-221.
[4]Priestley M J N.Direct displacement-based design of precast/prestressed concrete buildings[J].PCI Journal,2002,47(6):66-79.
[5]罗文斌,钱稼茹.钢筋混凝土框架基于位移的抗震设计[J].土木工程学报,2003,36(5):22-29.LUO Wenbin,QIAN Jiaru.Displacement-based seismic design for RC frames[J].China Civil Engineering Journal,2003,36(5):22-29.(inChinese)
[6]周定松,吕西林,蒋欢军.钢筋混凝土框架结构基于性能的抗震设计方法[J].四川建筑科学研究,2005,31(6):122-127.ZHOU Dingsong,LU Xilin,JIANG Huangjun.Performance-based seismic design method for RC frame structures[J].Building Science Researchof Sichuan,2005,31(6):122-127.(in Chinese)
[7]梁兴文,黄雅捷,杨其伟.钢筋混凝土框架结构基于位移的抗震设计方法研究[J].土木工程学报,2005,38(9):53-60.LIANG Xingwen,HUANG Yajie,YANG Qiwei.Displacement-based seismic design method of RC frames[J].China Civil Engineering Journal,2005,38(9):53-60.(in Chinese)
[8]GB50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB50011-2010 Seismic design code for buildings[S].Beijing:China Architecture Industry Press,2010.(in Chinese)
[9]简斌,翁健,金云飞.直接基于位移预应力混凝土抗震设计方法[J].工程力学,2010,27(7):205-211.JIAN Bin,WENG Jian,JIN Yunfei.Direct displacement-based seismic design for prestressed concrete frame structures[J].Engineering Mechan-ics,2010,27(7):205-211.(in Chinese)
[10]金云飞.预应力混凝土框架结构直接基于位移的抗震设计方法的研究[D].重庆:重庆大学,2010.JIN Yunfei.Study on direct displacement-based design approach of prestressed concrete frame structures for seismic resistance[D].Chongqing:Chongqing University,2010.(in Chinese)
[11]王媛.直接基于位移的PPC框架抗震设计理论及其初步应用研究[D].重庆:重庆大学,2011.WANG Yuan.Study on the theory and preliminary application of direct displacement-based seismic design approach of partially prestressed concreteframe structures[D].Chongqing:Chongqing University,2011.(in Chinese)
[12]ATC.Seismic evaluation and retrofit of concrete buildings[R].Rep.ATC-40,Applied Technology Council,Redwood City.,Calif,1996.
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