Research on Dynamic Characteristics of Joint of RC Frame Structure with NES

被引:6
作者
Yang, Haixu [1 ]
Yang, Baolei [1 ]
Wang, Haibiao [1 ]
Zhang, Maohua [1 ]
Ni, Songyuan [2 ]
机构
[1] Northeast Forestry Univ, Dept Civil Engn, Harbin 150040, Peoples R China
[2] Qingdao Agr Univ, Dept Civil Engn, Qingdao 266109, Peoples R China
基金
中国国家自然科学基金;
关键词
NES; dynamic characteristics; shaking table test; failure mode of joint; NONLINEAR ENERGY SINK; BEAM-COLUMN JOINTS; OPTIMIZATION; OSCILLATORS; PERFORMANCE;
D O I
10.3390/su141811229
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The NES (nonlinear energy sink) is a new type of nonlinear tuned mass damper that is connected to the shock-absorbing main structure through strong nonlinear stiffness and viscous damping. The vibrational energy in the main structure is transferred to the NES oscillator by means of target energy transfer. A shaking table test of a 1:4 scaled RC (Reinforced Concrete) frame structure model with a new type of NES shock absorber was conducted to study the damping effect of the NES shock absorber, especially for the influence of joint strength and deformation. The NES used in this experiment has a relatively large nonlinear stiffness and a wide vibration absorption frequency band. The variation of reinforcement strains, node failure mode, and structural natural frequency of 1 story and two-layer joints of the model frame structure with NES were studied. The test results showed that NES could effectively reduce the strains of longitudinal reinforcement and stirrup in beams and columns and delay the plastic hinge development at the bottom and the top of the column. The frame model with NES installed has failures at the beam ends and shear failures at the nodes, realizing the seismic mechanism of solid columns and weak beams. Compared with ordinary seismic structures, the NES can effectively reduce the shear stress of concrete at the joints and alleviate the shear failure of joints. The final failure of the NES shock absorbing structure was the yielding of the steel bars at the bottom of the column and the crushing of the concrete at the foot of the column, and the connection between the column foot and the backplane became loose simultaneously. The decreasing rate of the vibration frequency declined due to the NES with varied broadband absorbing capability. It can be seen that the NES shock absorber not only has a good effect on reducing the seismic response of the structure, but more importantly, the damage of the structural nodes is greatly reduced, and therefore, the seismic capacity of the structure improved.
引用
收藏
页数:25
相关论文
共 46 条
[1]  
[Anonymous], 2010, Code for Seismic Design of Buildings
[2]  
[Anonymous], 2010, Code for design of concrete structures
[3]   Vibration mitigation of a rotating beam under external periodic force using a nonlinear energy sink (NES) [J].
Bab, S. ;
Khadem, S. E. ;
Mahdiabadi, M. K. ;
Shahgholi, M. .
JOURNAL OF VIBRATION AND CONTROL, 2017, 23 (06) :1001-1025
[4]   Stochastic optimization of nonlinear energy sinks [J].
Boroson, Ethan ;
Missoum, Samy .
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION, 2017, 55 (02) :633-646
[5]   Elimination of multimode resonances of composite plate by inertial nonlinear energy sinks [J].
Chen, Hong-Yan ;
Mao, Xiao-Ye ;
Ding, Hu ;
Chen, Li-Qun .
MECHANICAL SYSTEMS AND SIGNAL PROCESSING, 2020, 135
[6]   Performance of non-smooth nonlinear energy sink with descending stiffness [J].
Chen, Jian En ;
Sun, Min ;
Hu, Wen Hua ;
Zhang, Jian Hua ;
Wei, Zhou Chao .
NONLINEAR DYNAMICS, 2020, 100 (01) :255-267
[7]  
[陈玲俐 Chen Lingli], 2012, [建筑结构, Building Structure], V42, P76
[8]  
[清华大学、西南交通大学、北京交通大学土木工程结构专家组 Civil and Structural Groups of Tsinghua], 2008, [建筑结构学报, Journal of Building Structures], V29, P1
[9]   Vortex-induced vibrations mitigation through a nonlinear energy sink [J].
Dai, H. L. ;
Abdelkefi, A. ;
Wang, L. .
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION, 2017, 42 :22-36
[10]   Design, construction and experimental performance of a nonlinear energy sink in mitigating multi-modal vibrations [J].
Dekemele, Kevin ;
Van Torre, Patrick ;
Loccufier, Mia .
JOURNAL OF SOUND AND VIBRATION, 2020, 473