Frame property of unequal storey height with specially shaped columns under cyclic loading

Abstract

A 1/3-scale reinfored concrete (RC) frame of unequal storey height with specially shaped columns was tested under low frequency cyclic loading. The damage characteristic, bearing capacity, deformation capacity and ductility were analyzed. The restoring force model of the frame was obtained based on the study of the hysteresis curve measured in experiment, and the stiffness degeneration characteristics of every storey of the frame were analyzed. Finally the accumulated damage was analyzed with the damage assessment model. It is shown that the seismic behavior of this frame of unequal storey height with specially shaped columns is generally good, but the bottom of first floor column is a weak part, which should be paid more attention in design, and the restoring force model derived from this experiment can be seen as a valuable guide for design and non-linear finite element analysis for this kind of structure.

Keywords

frame / specially shaped column / restoring force / accumulated damage / seismic behavior

References

[1] JGJ 149-2006.Technical specification for concrete structure with specially shaped columns [S], 2006, Beijing, China Architectural Industry Press

[2] SzalaiJ., PappF.. A new residual stress distribution for hot-rolled I-shaped sections [J]. Journal of Constructional Steel Research, 2005, 61(6): 845-861

[3] ChenC. C., LiJ. M., WengC. C.. Experimental behaviour and strength of concrete-encased composite beam-columns with T-shaped steel section under cyclic loading [J]. Journal of Constructional Steel Research, 2005, 61(7): 863-881

[4] WangT.-c., LiX.-h., ZhaoS.-wei.. Seismic behavior of frame with specially shaped columns subjected to cyclic load [J]. Transactions of Tianjin University, 2007, 13(5): 340-343

[5] KIMS. D., KIMS. S., JuY. K.. Strength evaluation of beam-column connection in the weak axis of H-shaped column [J]. Engineering Structures, 2008, 30(6): 1699-1710

[6] XuY.-y., WuBo.. Fire resistance of reinforced concrete columns with L-, T-, and +-shaped cross-sections [J]. Fire Safety Journal, 2009, 44(6): 869-880

[7] WuB., XuY.-ye.. Behavior of axially-and-rotationally restrained concrete columns with ‘+’-shaped cross section and subjected to fire [J]. Fire Safety Journal, 2009, 44(2): 212-218

[8] WangT.-c., ZhangX.-h., KangG.-yi.. Experimental comparison of seismic behavior of two RC frames with specially shaped columns [J]. Journal of Tianjin University, 2007, 40(7): 791-798

[9] WangT.-c., ZhangX.-h., ZhaoH.-long.. Experimental study on seismic behavior of RC frames with specially shaped columns reinforced by fiber [J]. Journal of Earthquake Engineering and Engineering Vibration, 2008, 28(6): 178-185

[10] LüX.-l., LuW.-dong.. Experimental research of square-steel tube concrete columns subjected to cyclic loading [J]. Journal of Building Structure, 2000, 21(2): 2-7

[11] XuY.-f., TangH., ChenZ.-c., WangL.-guang.. Research of resilience model of steel high strength concrete frame node [J]. Journal of Lanzhou Technology University, 2004, 30(5): 116-118

[12] FaleiroJ., OllerS., BarbatA. H.. Plastic-damage seismic model for reinforced concrete frames [J]. Computers and Structures, 2008, 86: 581-597

[13] FangS. E., RicardoP., de RoeckG.. Damage identification of a reinforced concrete frame by finite element model updating using damage parameterization [J]. Journal of Sound and Vibration, 2008, 313: 544-559

[14] DiaoB., LiS.-c., YeY.-hua.. Analysis and experiment of cumulated damage of RC structures with special columns under cyclic loading [J]. Journal of Building Structures, 2008, 29(1): 57-63

[15] ZhaoY.-j., LiZ.-x., ChenY.-xia.. Research on limit values of axial compression ratios of specially shaped RC columns in case of 4th seismic grade [J]. Journal of Building Structures, 2004, 25(3): 58-62