The Study On The Causes Of Damage And The Using Life Prediction Of Bridge Deck Pavements

Bridge deck pavement is a important pavement structure of bridge's appurtenant works, and the shorting using life is always a difficulty which puzzles bridge workers. Factors affecting the using of bridge deck pavement is diverse, they not only relate with the steps such as the design, construction and maintenance, but also relate with the circumstance, factors caused by man. Therefore, bridge deck pavements present dilapidation repeatedly after bridges opened to traffic, the rules and criterions existed of bridge deck pavement can not satisfy the needs of design, construction and safe using, all these demand make the study on life circle of bridge deck pavements immediately.This paper is the important ingredient of "Bridgework Life Circle Design Theory and Method Study", which belongs to Nation west traffic construction science and technology item. Basing on the statistic datum existed of bridge deck pavements, analyze the main failure modes and its main causes to damage on different styles of bridge, at the same time, through the big calculation software ,establish the space models to simulate the course of mechanics of bridge deck pavements, analyze the main factors which affect the bridge deck pavement's mechanics and the relations between them; according to the atmospheric circulation circumstances of bridge deck pavements, take the statistic datum of using life of prefabricated T-beam,box girders and casting girder in region of HUA-NAN as examples to returning analysis ,establishing the life prediction model of this style bridges; associating "the Method of Estimating to Life Cycle Costing" (LCC),bring forward this method to take a evaluation of economy on bridge deck pavements, insure the life cycle costing reasonable; giving some tactics on the design of bridge deck pavements.The results shows: the shapes of damage to the bridge deck pavement have crack,pit slot, local severity damage and the phenomena of embrace , track of asphalt concrete and etc, the main causes leading to these damages are diverse, such as the factors of mechanics characteristic of structural bridge , the style of structures of bridge deck pavements themselves , the atmospheric circulation circumstances and the level of construction, maintenance; shear broken is the main style of damage to the bridge deck pavements, intensifying the bond strength between the bridge and pavement is a effective way to prolong the using life of bridge deck pavements; the thickness of bridge deck pavement,the modulus of pavement material and the braking force of vehicles are the main factors which affecting the mechanics of bridge deck pavements; the predicted models of using life of all kinds of bridge can take conic to simulate.The results of the paper gives some experiences and advises to the design, construction and maintenance.