# Experimental Investigation on the Mechanical Properties of Curved Metallic Plate Dampers  
[PERSON]  
1 School of Science, Qingdao University of Technology, Qingdao 266033, China; [EMAIL_ADDRESS]  
[PERSON]  
2 School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China  
3 Beijing Advanced Innovation Center for Future Urban Design, Beijing 100044, China; [EMAIL_ADDRESS]  
[PERSON]  
3 School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China  
34 School of Civil Engineering, Southeast University, Nanjing 210096, China  
4 Correspondence: [EMAIL_ADDRESS]; Tel.: +86(532)-8507-169344 December 2019 24 December 201  
practical applications of energy dissipation devices, the vibration control technique can be used to mitigate seismic hazard and achieve better seismic performance of the structure under vibrations.  
The passive energy dissipation method has been widely used in the seismic control of structures since the 1980s [1; 2]. Dampers can be classified into metal, viscoelastic [3], viscous [4], tuned absorption dampers [5], smart materials based isolation and suspension system [6; 7], recently developed smart materials based damping or negative stiffness structure [8; 9; 10], actively tuned damper and driver system [11; 12], according to the energy dissipation methods, control force characteristics [13] as well as materials used. The metal damper has a certain stiffness, and its energy dissipation mechanism depends on the elastic-plastic deformation. It is cheap, easy to install, and less affected by temperature. Therefore, it is suitable for all kinds of building structures and has a good economic value and effectiveness for the reinforcement and reconstruction of existing and new buildings. Metallic dampers can further be categorized into axial yield [14; 15], shear yield [16], flexural yield [17; 18], and combined yield devices [19].  
Existing forms of flexural yield dampers include the added damping and stiffness (ADAS) device [20; 21; 22], triangular added damping and stiffness (TADAS) device [23; 24], knee brace device [25; 26], steel-composited wall dampers and B-C-W members [27; 28], non-uniform steel strip damper [29], rhombic low yield strength steel plate [30], J-shaped steel hysteresis damper [31; 32], U-shaped damper [33; 34; 35], pipe damper [36], dual-pipe damper [37], bar-fuse damper [38], accordion metallic damper [39], pipe-fuse damper [40], pure bending yielding dissipater [41], crawler steel damper [42], and hourglass-shaped strip damper [43].  
Because the yield load of single-sheet steel is small, some bending plate dampers need to be combined with multiple sheets of the steel plate. In order to facilitate the energy consumption and reduce the stress concentration, it is necessary to optimize the shape of the steel plate, which makes the processing difficult and cannot eliminate the influence of the vertical force on the damper. In view of the above problems, this paper proposes the improvement of a curved plate damper based on the principle of the U-shaped damper. The mechanical characteristics and energy dissipation capacity of the curved plate damper were investigated using theoretical and experimental methods.