| In order to satisfy the resource exploration, promote regional economic development, the need of safeguarding sovereignty and for the connection of the mainland and Marine, cross-sea bridge and other offshore engineering becoming more and more urgent,With the rapid development of science and technology. Sea-crossing bridge as the economic ties between the two cities and an important hub of social development, and lifeline engineering in the earthquake, to ensure the offshore bridge safety is profound and great significance.The seismic isolation technology is a kind of effective measures to ensure the safety of buildings, Bridges, nuclear power plant.Isolation bearing as the carrier of the seismic isolation technology. However, the current research on the durability of isolation bearing is not sufficient. In this paper,the friction pair material accelerated corrosion test, the friction pendulum bearing accelerated corrosion test, and Cyclic-salt-spray corrosion test and wet-dry-cyclic corrosion test were carried out to research the performance degradation law of friction pendulum isolation bearings, which combined with the actual conditions of Marine corrosion environment. Specific contents are as follows:1.The current research about the durability of isolation bearing: by consulting a large number of literature, in combination with isolation bearing material composition and structure, summed up many researchers at home and abroad analyzed the aging of rubber bearing and the fatigue of rubber bearing, yet there is little research on corrosion of the friction pendulum isolation bearings. therefore, summarized the research status of its durability from the aspects of the composition material of friction pendulum bearing, it is concluded that the influence factors of the performance degradation law of friction pendulum isolation bearings in the Marine environment.2.Test program development: by the location and corrosion characteristics of isolation bearing in sea-crossing bridge, using Cyclic-salt-spray corrosion test and wet-dry-cyclic corrosion test of friction pair material and friction pendulum isolation bearing in artificial accelerated corrosion, and comparison of the laboratory accelerated corrosion factors and the actual Marine environment factor, it is concluded that the speed ratio of accelerated corrosion test. At last, the test program and plan was formulated.3.Friction pair material in the artificial accelerated corrosion test: Cyclic-saltspray corrosion and wet-dry-cyclic corrosion test for the plate of stainless steel and the pieces of PTFE are conducted, then the phenomenon changes of materials at the corrosion time node are described. What’s more, the various corrosion time node static and dynamic friction coefficient of friction pair material are recorded by horizontal Hysteretic performance test.4.The friction pendulum isolation bearings in the artificial accelerated corrosion test: Cyclic-salt-spray corrosion and wet-dry-cyclic corrosion test for the friction pendulum isolation bearings are conducted, then the phenomenon changes of bearings and connecting pieces at the corrosion time node are described. Along with the change of corrosion time, the amount of vertical compression and vertical stiffness are recorded through the vertical bearing capacity test. At last, the performance degradation law of friction pendulum isolation bearings are summarized by horizontal Hysteretic performance test.5.Comparison between cyclic-salt-spray corrosion test and wet-dry-cyclic corrosion test: according to the performance degradation law of the materials of friction pair and friction pendulum bearing in Cyclic-salt- spray corrosion test and wet-dry-cyclic corrosion test, then contrast variation law of the static and dynamic friction coefficient. |
