Study On Circle Life Of Bridge Expansion Joint And Bearing

On later stage of 1990s, a large amount of infrastructure built after the developed country is in World Warâ…¡was finished in America and Europe entered the peak period of maintaining gradually. Therefore many kinds of questions such as economic losses, pressure of public opinion initiated have caused the attention of bridge engineering world, relevant research work launch in an all-round way, the analytical method of life cycle is developed progressively in the world.In the world about the whole life-span inspiration that study, bridge engineering world pay attention to the whole concept of life-span in domestic project circle rapidly. In 2009, the scientific and technological project "the design theory of the whole life-span of science of bridge building and method research" of western traffic, undertaken by the China Highway Planning and Design Institute, Tongji University, Chang'an University, Beijing University, obtained the official identification of acceptance by the Ministry of Communications Expert Group, and got the scientific and technological progress special grand prize.of China Communications Construction Co., Ltd.This text is regarded as the western scientific and technological project of traffic construction "The design theory of the whole life-span of science of bridge building and method research "One piece component. Investigate the statistical data as the foundation with four bridges of provincial highway of national road of Henan Province, The main contents are as follows:1.Take rubbery expansion joint as an example and set up the finite element model, employ and accumulate the theory of damaging to destroy and analyze the life-span used to their tiredly normally to estimate tiredly, provide the suggestion value of service life of rubbery expansion joint.2.Take rubber bearing and steel bearing as example, employ rubbery aging theory and tired to test, estimate to life-span used. Provide rubber bearing the theory life-span of seats through the rubbery aging theory, has tapped to the fatigue life of the steel bearing through the tired test.3.Proceed from angle of the whole life-span, discussed durability, can building, can changing design of expansion joint and bearing, provide its construction craft and maintain attentive matters.Can work out through the above research:Should be from planning, design, construction, maintenance, dismantlement for five stages, analyse and research the whole life-span course of the component of the bridge in an all-round way. It is more rational of retractor device of built-in butted bridge, durability is obviously superior to the expansion joint of other types. Normal design service life of rubbery expansion joint limited to fatigue life of concrete, it was probably 13. The proposing value of service life of design was 50 of rubber bearing. The fatigue life of steel bearing is non-tired (Can reach its service life of design).