Seismic performance of bending-type frictional steel truss#br#
coupling beams (BFTCB)
Cui Yao1,2,3 Wu Tianjiao4 Wang Tao2,3
1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;
2. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China; 3. Key Laboratory of Earthquake Engineering
and Engineering Vibration, China Earthquake Administration, Harbin 150080, China;4. CMCU Engineering Co., Ltd., Chongqing 400039, China
Abstract：In this paper, a bending-type frictional steel truss coupling beam (BFTCB) is proposed. The input energy is consumed by the friction device at the lower chord of the steel truss coupling beam. A stable energy consumption capacity is obtained while no damage is observed at the main body of the coupling beam. The BFTCB specimen was tested under cyclic loading, the deformation and energy dissipation capacity were studied. The test results indicated that the deformation mainly came from the sliding of friction device, and the BFTCB had stable hysteretic behavior. A detailed finite element model (FEM) was established and calibrated using the experimental results. Based on the numerical results, the mechanism of BFTCB specimen and the behavior of friction device was studied in detail. Parametric studies were conducted to investigate the effect of the sliding force of the friction device and the span-to-height ratio of the coupling beam on the seismic performance of the BFTCB. Finally, the calculation method for the load-bearing capacity of the BFTCB is proposed.
