基于软化拉-压杆模型钢骨超高强混凝土框架节点抗剪承载力计算
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摘要
钢骨超高强混凝土框架节点是一种新型组合结构.为计算钢骨超高强混凝土框架节点的抗剪承载力,基于钢筋混凝土框架节点软化拉-压杆模型,以钢骨和超高强混凝土为压杆,以钢骨、纵筋、箍筋为拉杆,建立了钢骨超高强混凝土框架节点软化拉-压杆模型,进行了框架节点抗剪承载力计算,并与试验值进行了比较,分析了轴压比和配箍率对计算值的影响.结果表明,抗剪承载力试验值与计算值的比在1.2左右,吻合较好,且计算值偏于安全;随着轴压比的增大,计算值增大;随着配箍率的增大,计算值亦增大.所提出的钢骨超高强混凝土框架节点软化拉-压杆模型很好地反映出轴压比和配箍率对抗剪承载力的影响.
Steel reinforced ultra-high strength concrete frame connection is a new type of composite structure.In order to calculate the shear strength of steel reinforced ultra-high strength concrete frame connection,a softened strut-and-tie model is proposed based on the reinforced concrete frame connection.In this model,steel and ultra-high strength concrete are considered as strut,and steel,longitudinal reinforcement,loop reinforcement are considered as tie.Shear strength of steel reinforced ultra-high strength concrete frame connection is calculated,the calculated values are compared with test values,and influences of axial compression ratio and stirrup ratio on the calculated values of shear strength are analyzed.The experimental results show that the ratios between test values and calculated values are approximately 1.2,and the calculated values agree well with test values and are reliable.The calculated values increase with axial compression ratio increment or with stirrup ratio increment.The proposed softened strut-and-tie model can reflect the influences of axial compression ratio and stirrup ratio on shear strength.
Steel reinforced ultra-high strength concrete frame connection is a new type of composite structure.In order to calculate the shear strength of steel reinforced ultra-high strength concrete frame connection,a softened strut-and-tie model is proposed based on the reinforced concrete frame connection.In this model,steel and ultra-high strength concrete are considered as strut,and steel,longitudinal reinforcement,loop reinforcement are considered as tie.Shear strength of steel reinforced ultra-high strength concrete frame connection is calculated,the calculated values are compared with test values,and influences of axial compression ratio and stirrup ratio on the calculated values of shear strength are analyzed.The experimental results show that the ratios between test values and calculated values are approximately 1.2,and the calculated values agree well with test values and are reliable.The calculated values increase with axial compression ratio increment or with stirrup ratio increment.The proposed softened strut-and-tie model can reflect the influences of axial compression ratio and stirrup ratio on shear strength.
引文
[1]刘鸣,刘伯权,邢国华.基于简化拉压杆模型的钢筋混凝土框架异型节点抗剪性能研究[J].地震工程与工程振动,2011,31(2):63-67.LIU Ming,LIU Bo-quan,XING Guo-hua.Shear behavior of RC irregular interior joints using simplified softened strut-and-tie model[J].Journal of Earthquake Engineering and Engineering Vibration,2011,31(2):63-67.(in Chinese)
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[6]Rahal K N.Simplified design and capacity calculations of shear strength in reinforced concrete membrane elements[J].Engineering Structures,2008,30(10):2782-2791.
[7]Godat A,Chaallal O.Strut-and-tie method for externally bonded FRP shear-strengthened largescale RC beams[J].Composite Structures,2013,99:327-338.
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[11]霍林生,李宏男,肖诗云,等.汶川地震钢筋混凝土框架结构震害调查与启示[J].大连理工大学学报,2009,49(5):718-723.HUO Lin-sheng,LI Hong-nan,XIAO Shi-yun,et al.Earthquake damage investigation and analysis of reinforced concrete frame structures in Wenchuan earthquake[J].Journal of Dalian University of Technology,2009,49(5):718-723.(in Chinese)
[2]Chen C C,Suswanto B,Lin Y J.Behavior and strength of steel reinforced concrete beam-column joints with single-side force inputs[J].Journal of Constructional Steel Research,2009,65(8-9):1569-1581.
[3]Braconi A,Elamary A,Salvatore W.Seismic behaviour of beam-to-column partial-strength joints for steel-concrete composite frames[J].Journal of Constructional Steel Research,2010,66(12):1431-1444.
[4]Lee J Y,Kim J Y,Oh G J.Strength deterioration of reinforced concrete beam-column joints subjected to cyclic loading[J].Engineering Structures,2009,31(9):2070-2085.
[5]Wang G L,Dai J G,Teng J G.Shear strength model for RC beam-column joints under seismic loading[J].Engineering Structures,2012,40:350-360.
[6]Rahal K N.Simplified design and capacity calculations of shear strength in reinforced concrete membrane elements[J].Engineering Structures,2008,30(10):2782-2791.
[7]Godat A,Chaallal O.Strut-and-tie method for externally bonded FRP shear-strengthened largescale RC beams[J].Composite Structures,2013,99:327-338.
[8]Kotsovou G,Mouzakis H.Exterior RC beam–column joints:New design approach[J].Engineering Structures,2012,41:307-319.
[9]Hwang S J,Lee H J.Strength prediction for discontinuity regions by softened strut-and-tie model[J].Journal of Structural Engineering,2002,128(12):1519-1526.
[10]中冶集团建筑研究总院.YB 9082—2006钢骨混凝土结构设计规程[S].北京:冶金工业出版社,2007.Central Research Institute of Building and Construction,China Metallurgical Construction Group Corporation.YB 9082—2006 Technical Specification of Steel-Reinforced Concrete Structures[S].Beijing:Metallurgical Industry Press,2007.(in Chinese)
[11]霍林生,李宏男,肖诗云,等.汶川地震钢筋混凝土框架结构震害调查与启示[J].大连理工大学学报,2009,49(5):718-723.HUO Lin-sheng,LI Hong-nan,XIAO Shi-yun,et al.Earthquake damage investigation and analysis of reinforced concrete frame structures in Wenchuan earthquake[J].Journal of Dalian University of Technology,2009,49(5):718-723.(in Chinese)
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