Enhancing the performance capabilities of seismically isolated buildings using multi-stage friction pendulum sliding bearings

Abstract Running-in of the main bearings of diesel engine is a crucial process before service. Multi-stage running-in is a better way to enhance running-in quality and efficiency. In order to reveal the evolution of phase trajectory and compare the running-in quality, the running-in tests were performed with the material of bearing bush (Sn-11Sb-6Cu) and shaft (AISI 1045). The running-in quality was comprehensively evaluated via friction coefficient, phase trajectory and surface topography. Results indicate that the phase trajectories show a trend of stage-by-stage convergence. The multi-stage running-in can achieve a more stable attractor, lower friction coefficient and smoother surface, that is, a better running-in quality than the constant running-in scheme. This study provides a reference for formulating running-in specifications for sliding bearings.

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Experimental and analytical studies of structures seismically isolated with an uplift-restraining friction pendulum system

Earthquake Engineering & Structural Dynamics ◽

10.1002/eqe.546 ◽

2006 ◽

Vol 35 (5) ◽

pp. 595-611 ◽

Cited By ~ 23

Author(s):

Panayiotis C. Roussis ◽

Michael C. Constantinou

Keyword(s):

Pendulum System ◽

Analytical Studies ◽

Seismically Isolated ◽

Friction Pendulum ◽

Friction Pendulum System

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Numerical Simulation of Frictional Heating Effects of Sliding Friction Bearings for Isolated Bridges

International Journal of Structural Stability and Dynamics ◽

10.1142/s0219455418400084 ◽

2018 ◽

Vol 18 (08) ◽

pp. 1840008

Author(s):

Qiang Han ◽

Jianian Wen ◽

Zilan Zhong ◽

Xiuli Du

Keyword(s):

Energy Dissipation ◽

Sliding Friction ◽

Frictional Heating ◽

Numerical Results ◽

Effective Stiffness ◽

Fe Model ◽

Sliding Bearings ◽

Heating Effects ◽

Friction Pendulum ◽

Friction Bearings

Sliding friction bearings are effective passive devices to mitigate the seismic responses of structures. Extensive researches have been conducted on sliding bearings. However, most previous studies were based on the assumption that the effects of frictional heating are negligible. A three-dimensional thermal-mechanical-coupled finite element (FE) model of the friction pendulum system (FPS) was developed in this study. Good agreements between the numerical results and the data measured in the previous tests, in terms of the force–displacement curves and temperature time-histories, indicate that the proposed FE model can predict the response of the FPS. Based on the developed FE model, the surface temperature distribution, the effective stiffness and the energy dissipation of the double concave friction pendulum and multiple friction pendulum bearings were investigated and compared. In addition, the thermal states of the sliding bearings in the bridge during earthquake were evaluated. The numerical results indicate that the temperature rise in the sliding bearings leads to the degradation of the effective stiffness and less energy dissipation. The relative displacements of the bearings increase considering the frictional heating effects in the bearings. If the frictional heating of the bearings is ignored, the peak bearing displacements will be underestimated.

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