不同肢长钢筋混凝土异型柱抗震性能试验研究
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摘要
目的探讨不同肢长对钢筋混凝土异型柱的承载力、刚度及延性的影响.方法用拟静力试验方法对不同肢长异型柱进行抗震性能研究.结果试验得出异型柱的最大承载力、抗侧移刚度及延性等相关数据.结论轴压比较大时,其承载力、侧移刚度较大,但延性较差;随着柱子肢长的增加,其承载力、侧移刚度随之提高,这对结构设计有一定的好处,但肢长应控制在一定的范围内,避免形成短柱;试验中由于腹板的受压区混凝土面积较小,因此该压区混凝土破坏严重,纵筋也成屈曲状态,建议提高混凝土等级,以增加该区混凝土的抗压能力.
In this paper,by means of experimental study on 4 pieces of T-shaped and 2 pieces of crisscross-shaped reinforced concrete columns under cyclic loading,the strength,stiffness and ductility of special-shaped column in different axial pressure ratio are analyzed.The function of different flange on raising seismic capacity of special-shaped column is discussed.The restoring force model is also considered.These provide the basis for seismic design of special-shaped columns.When the axial pressure ratio gets more,its endurance and stiffness also go up,but its ductility is weak; when the pillar's flange gets longer,its endurance and stiffness increase,which makes the structure designing easier but the flange should be well arranged to avoid turning into short pillar.The area of concrete in the flange is smaller,so it is severely damaged and the bars are in the situation of badly bending.So it is recommended to better the quality degree of concrete to increase its endurance against pressure.
In this paper,by means of experimental study on 4 pieces of T-shaped and 2 pieces of crisscross-shaped reinforced concrete columns under cyclic loading,the strength,stiffness and ductility of special-shaped column in different axial pressure ratio are analyzed.The function of different flange on raising seismic capacity of special-shaped column is discussed.The restoring force model is also considered.These provide the basis for seismic design of special-shaped columns.When the axial pressure ratio gets more,its endurance and stiffness also go up,but its ductility is weak; when the pillar's flange gets longer,its endurance and stiffness increase,which makes the structure designing easier but the flange should be well arranged to avoid turning into short pillar.The area of concrete in the flange is smaller,so it is severely damaged and the bars are in the situation of badly bending.So it is recommended to better the quality degree of concrete to increase its endurance against pressure.
引文
[1] 曹万林,王光远,魏文湘,等.不同方向周期反复荷载作用T形柱的性能[J].地震工程与工程振动,1995,15(4):76-84.
[2] 曹万林,胡国振,周明杰,等.钢筋混凝土带暗柱十字形柱抗震性能试验研究[J].世界地震工程,1999,15(2):28-33.
[3] 陈鑫,赵成文,赵乃志.不同肢长异型柱框架结构弹塑性时程分析[J].沈阳建筑大学学报,2004,20(4):287-291.
[4] TsaoWH,ThomasHsu.NonlinearComputerAnalysisofBiaxiallyLoadedL-shapedSlenderReinforcedConcretedColumns[J].Computers＆Structures,1993,49(4):579-588.
[5] Mallikarjuna,MahadevappaP.ComputerAidedAnalysisofReinforcedConcreteColumnsSubjectedtoAxialCompressionandBending IL shapedSections[J].Computers＆Structures,1992,44(5):1121-1138.
[6] Cheng Tzu,ThomasHsu.BiaxiallyLoadedL ShapedReinforcedConcreteColumns[J].JournalofStructuralEngineering,1985,111(12):2576-2595.
[7] Cheng Tzu,ThomasHsu.T shapedReinforcedConcreteMembersunderBiaxialBendingandAxialCompression[J].ACIStructuralJournal,1989,86(4):460-468.
[8] GB50011-2001建筑抗震规范[S].
[9] GB50011-2002混凝土结构设计规范[S].
[2] 曹万林,胡国振,周明杰,等.钢筋混凝土带暗柱十字形柱抗震性能试验研究[J].世界地震工程,1999,15(2):28-33.
[3] 陈鑫,赵成文,赵乃志.不同肢长异型柱框架结构弹塑性时程分析[J].沈阳建筑大学学报,2004,20(4):287-291.
[4] TsaoWH,ThomasHsu.NonlinearComputerAnalysisofBiaxiallyLoadedL-shapedSlenderReinforcedConcretedColumns[J].Computers＆Structures,1993,49(4):579-588.
[5] Mallikarjuna,MahadevappaP.ComputerAidedAnalysisofReinforcedConcreteColumnsSubjectedtoAxialCompressionandBending IL shapedSections[J].Computers＆Structures,1992,44(5):1121-1138.
[6] Cheng Tzu,ThomasHsu.BiaxiallyLoadedL ShapedReinforcedConcreteColumns[J].JournalofStructuralEngineering,1985,111(12):2576-2595.
[7] Cheng Tzu,ThomasHsu.T shapedReinforcedConcreteMembersunderBiaxialBendingandAxialCompression[J].ACIStructuralJournal,1989,86(4):460-468.
[8] GB50011-2001建筑抗震规范[S].
[9] GB50011-2002混凝土结构设计规范[S].
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