Abstract
AbstractAt present, it is difficult to acquire the internal state of sliding friction bearing, so the assessment indexes and quantitative evaluation standard for service state of friction pendulum bearing (FPB) is lack. In order to propose the relationship between service state and mechanical performance, the key components of FPB affecting the seismic response is as the research subject. The 3D solid refinement finite element numerical model of FPB is established, and its rationality of and simulated results reliability is verified by experimental results. Combined the mechanical performance theory calculation models of FPB and friction characteristics of sliding interface, the simulated results of mechanical performance including effective stiffness, total energy consumption, effective period, effective damping ratio of FPB under the influence of sensitive parameters is analyzed. The results show that the compressive stress is the most sensitive factor. With the increase of compressive stress, the equivalent stiffness increases exponentially, but the equivalent period increases and the equivalent damping ratio decreases, which obviously deteriorates the seismic performance of the seismic isolation bridge. When the compressive stress is constant, the cumulative sliding distance and sliding velocity can obviously affect the mechanical performance of the bearing, but the variation range of the equivalent damping ratio is less than 10%. In addition, when the friction characteristics of the upper and lower sliding interfaces of the FPB are not consistent, the condition of the lower sliding interface has a significant impact on the mechanical properties of the FPB. The research results provide data and method support for further quantitative evaluation of the seismic performance for the serviced FPB and seismic isolation bridges.
Publisher
Springer Nature Singapore