|
|
|
| Experiment Investigation the Seismic Behavior of Concrete Core Separation Composite Columns |
| PI Tianxiang, CHEN Zhaozhi, ZHAO Jianxin, WANG Sicheng |
| Chongqing University, Chongqing 400045, China |
|
|
|
Abstract Research purposes:For the purpose of improving seismic behaviors of the cantilever columns, which are usually used in single-row column structures such as platform canopy and urban metro, the paper proposed a concrete core separation column composed of an inner column and an outer ring column, and put forward two types of connection columns with connectors and without connectors between the inner column and the outer ring column. We conducted the low-cycle reversed loading test of two large scale dimension specimens and numerical analysis with multi-parameters. The stiffness degradation, bearing capacity, ductility and energy dissipation of two columns were investigated, and the optimal design parameters such as the diameter ratio of inner and outer columns and the area ratio of longitudinal reinforcement were obtained.
Research conclusions:(1) The bearing capacity, energy consumption and elastic stiffness of the two core-separation composite columns are slightly lower than those of solid columns with the same reinforcement. However, when the concrete at the bottom of the column is broken, the damage of the inner column is less, and the yield of longitudinal reinforcement is significantly later than that of the outer column. The inner column can serves as the second seismic line of defense effectively. (2) Most of the concrete connectors in the column with connectors are in the plastic stress state and the initial stiffness is larger than that of the column without concrete connectors, but the energy dissipation capacity is slightly poor. (3) When the radius ratio of inner and outer circular columns is 0.4 and the reinforcement area ratio is 1 ∶2~1 ∶3, the two types of concrete core separation composite columns have better seismic behavior. (4) The relevant results can provide reference for the design of single column cantilever structure such as platform canopy.
|
|
Received: 15 December 2020
|
|
|
|
|
|
| [1] |
Jaradat OA,Mclean DI,Marsh ML.Performance of Existing Bridge Columns Under Cyclic Loading-Part 1:Experimental Results and Observed Behavior[J].ACI Structural Journal,1998(6):695-704.
|
| [2] |
Wehbe N I, Saiidi M S, Sander D H. Seismic Performance of Rectangular Bridge Columns with Moderate Confinement[J]. ACI Structural Journal, 1996(2):248-258.
|
| [3] |
Robert Park, M. J. Priestley, Wayne D. Gill. Ductility of Square-confined Concrete Columns[J]. Journal of the Structural Division,ASCE,1982(4):929-950.
|
| [4] |
Oguzhan Bayrak, Shamim A. Sheikh. High-Strength Concrete Column under Simulated Earthquake Loading[J].ACI Structural Journal, 1997(6):708-722.
|
| [5] |
史庆轩,王朋,田园,等.高强箍筋高强混凝土柱抗震性能试验研究[J].工程力学,2014(8):161-167.Shi Qingxuan, Wang Peng, Tian Yuan, etc. Experimental Study on Seismic Behavior of High-Strength Concrete Columns with High-Strength Stirrups[J]. Engineering Mechanics, 2014(8):161-167.
|
| [6] |
梁书亭,丁大钧,陆勤.钢筋混凝土复合配箍柱铰的延性和抗震耗能试验研究[J].工业建筑,1994(11):16-20.Liang Shuting, Ding Dajun, Lu Qin. Experimental Study of Earthquake-Resistant Energy-Dissipation and Ductility of Reinforced Concrete Column Hinge with Composite Stirrups[J]. Industrial Construction, 1994(11):16-20.
|
| [7] |
雷自学,董三升,郭军庆,等.高强混凝土加芯柱抗震性能试验研究[J].建筑结构学报,2010(12):83-91.Lei Zixue, Dong Sansheng, Guo Junqing, etc. Test Study on Seismic Performance of High-strength Concrete Columns with Central Reinforcement[J]. Journal of Building Structures, 2010(12):83-91.
|
| [8] |
陈朝知.混凝土核心分离柱及站台雨棚结构抗震性能研究[D].重庆:重庆大学,2020.Chen Zhaozhi. Study on Seismic Performance of Reinforced Concrete Single Column Canopy Structure[D]. Chongqing: Chongqing University, 2020.
|
|
|
|
2022, Vol. 39 
