考虑轴压比影响时框架稳定性的刚重比控制方法
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摘要
改变框架柱的轴压比,对10根钢筋混凝土柱与5根钢柱进行压弯试验,拟合了轴压比对框架柱抗侧刚度的影响公式.用等效水平力方法推导了结构临界重力荷载,提出了基于结构刚重比控制的框架重力二阶效应的稳定计算方法,给出了考虑轴压比影响时框架结构稳定性的刚重比控制方法.结果表明:考虑轴压比影响,框架柱抗侧刚度提高,使得计算的刚重比更容易满足规范关于框架结构稳定性对刚重比的要求,考虑轴压比对框架柱抗侧刚度的影响,符合工程实际,为现行规范对高层框架侧移计算的完善提供参考.
Experiments in compression and bending were done for 10 concrete columns and 5 steel columns with various ratios of axial compressive force to the axial compressive ultimate capacity of the section,and the influence formulae of the ratio of axial compressive force to the axial compressive ultimate capacity of the section on the sideway stiffness of the frame columns were drawn out.The critical gravity load of the structure was derived by the equivalent horizontal load method,and the calculation method about the stability of the frames,which considered the effect of the second order of gravity by controlling the ratio of rigidity-to-gravity of the structure,was presented.It has been shown that the sideway stiffness of the frame columns increased when considering the influence of the axial load on the sideway stiffness of the frame columns,which made the ratio of rigidity-to-gravity meet the demand of the stability of the frame structures.Taking into account the influence of the axial load on the sideway stiffness of the frame columns can agree with engineering practice and can be helpful to the revision of the existing design codes for calculating the sideways of frames.
Experiments in compression and bending were done for 10 concrete columns and 5 steel columns with various ratios of axial compressive force to the axial compressive ultimate capacity of the section,and the influence formulae of the ratio of axial compressive force to the axial compressive ultimate capacity of the section on the sideway stiffness of the frame columns were drawn out.The critical gravity load of the structure was derived by the equivalent horizontal load method,and the calculation method about the stability of the frames,which considered the effect of the second order of gravity by controlling the ratio of rigidity-to-gravity of the structure,was presented.It has been shown that the sideway stiffness of the frame columns increased when considering the influence of the axial load on the sideway stiffness of the frame columns,which made the ratio of rigidity-to-gravity meet the demand of the stability of the frame structures.Taking into account the influence of the axial load on the sideway stiffness of the frame columns can agree with engineering practice and can be helpful to the revision of the existing design codes for calculating the sideways of frames.
引文
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[9]张国军,吕西林,刘伯权.轴压比超限时框架柱的恢复力模型研究[J].建筑结构学报,2006,27(1):90-98.ZHANG GJ,LU X L,LI U B Q.Research on restoring forcemodels of frame columns with ultra-li mited axial compression ratio[J].Journal of Building Structures,2006,27(1):90-98.(InChinese)
[10]沈蒲生.高层建筑结构设计[M].北京:中国建筑工业出版社,2006.SHEN P S.Design of tall building structures[M].Beijing:ChinaArchitecture&Building Press,2006.(In Chinese)
[11]姚松,田红旗.有限元刚度矩阵的压缩存贮及组集[J].中南大学学报:自然科学版,2006,37(4):826-830.YAO S,TIAN H Q.Compressed storage scheme and assemblyprocedure of global stiffness matrix in finite element analysis[J].Journal of Central South University:Natural Sciences,2006,37(4):826-830.(In Chinese)
[2]沈蒲生.高层建筑结构疑难释疑[M].北京:中国建筑工业出版社,2003.SHENP S.Explaination of questions for tall building structures[M].Beijing:China Architecture&Building Press,2003.(InChinese)
[3]郭健,何益斌,郦世平,等.基于刚度退化的框架结构受力性能研究[J].湖南大学学报:自然科学版,2007,34(5):20-23.GUOJ,HE Y B,LI S P,et al.Research on the behaviors offrame structures based on stiffness degradation[J].Journal of Hu-nan University:Natural Sciences,2007,34(5):20-23.(InChinese)
[4]王朝晖,汪梦甫.双向水平地震作用下非对称框架结构抗震分析简化方法[J].湖南大学学报:自然科学版,2007,34(4):1-4.WANG Z H,WANG M F.Si mplified procedure for the seismicanalysis of asymmetric frame structures subject to two-directionalhorizontal earthquake[J].Journal of Hunan University:NaturalSciences,2007,34(4):1-4.(In Chinese)
[5]陈道政,李爱群.混凝土柱轴压比限值控制的讨论[J].工业建筑,2002,32(8):75-76.CHEN D Z,LI A Q.Discussion on reinforced concrete columnaxial compression ratio li mit values[J].Industrial Construction,2002,32(8):75-76.(In Chinese)
[6]MURAT S,SALI M R R.Displacement based design of rein-forced concrete columnsfor confinement[J].ACI Structural Jour-nal,2002,99(1):3-31.
[7]GILL WD,PARK R,PRIESTLEY MJ N.Ductility of rectan-gular reinforced concrete columns with axial load[R].Christchurch:Department of Civil Engineering,University ofCanterbury,1979.
[8]ZHOU X S,SATOH T,JIANG WS,et al.Behavior of rein-forced concrete short column under high axial load[J].Transac-tion of the Japan Concrete Institute,1987,9(6):541-548.
[9]张国军,吕西林,刘伯权.轴压比超限时框架柱的恢复力模型研究[J].建筑结构学报,2006,27(1):90-98.ZHANG GJ,LU X L,LI U B Q.Research on restoring forcemodels of frame columns with ultra-li mited axial compression ratio[J].Journal of Building Structures,2006,27(1):90-98.(InChinese)
[10]沈蒲生.高层建筑结构设计[M].北京:中国建筑工业出版社,2006.SHEN P S.Design of tall building structures[M].Beijing:ChinaArchitecture&Building Press,2006.(In Chinese)
[11]姚松,田红旗.有限元刚度矩阵的压缩存贮及组集[J].中南大学学报:自然科学版,2006,37(4):826-830.YAO S,TIAN H Q.Compressed storage scheme and assemblyprocedure of global stiffness matrix in finite element analysis[J].Journal of Central South University:Natural Sciences,2006,37(4):826-830.(In Chinese)
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