Decks Performance Numerical Simulation Analysis

Bridge deck pavement is an important part of bridge and vehicle system. Because the mechanical mode of bridge deck pavement is different from that of the usual pavement, the calculation method for pavement can not reveal the actual stress state of bridge deck pavement. In order to provide a theoretic basis for the bridge system design and to improve the stress distribution and to prolong the performance term of the bridge deck pavement, the mechanical properties of the bridge deck pavement are studied under various conditions by use of the three-dimensional finite element method.The influence of different load locations on the stresses and strains of bridge deck pavement is discussed in this dissertation. Therefore, the worst load location in vertical and horizontal directions is determined. By calculating the problems of bridge deck pavement with different thickness of asphalt concrete pavement, the influences of different thickness of asphalt concrete pavement on the vertical displacement, stresses and surface deflection of the bridge deck pavement are carried out. The results provide a theoretical reference for choosing rational thickness of the bridge deck pavement. By using the anisotropy theory and the three-dimensional finite element method, a contact model of anisotropy for the bonding structure is constructed, and the influence of the overloading contact stress and strain between the bridge panel and bridge deck is calculated and analyzed. The results indicate that the condition of the bonding structure is a key factor to guarantee the credibility of the bridge deck pavement.In order to discuss the effect of the joint part conditions between hollow boards, the stress distributions of the bridge deck pavement are respectively analyzed as the joint part is intact or totally destroyed. Meanwhile, the linearity element and nonlinearity element are respectively used to simulate the actions of the joint part. The results indicate that the stress distributions of the bridge deck pavement are obviously improved when the joint part is intact, and the stability and reliability of the bridge deck pavement are strengthened. Then, the deformations and stresses of the bridge deck pavement at tip position of assembly simple beam bridge are analyzed under the vehicle load, and the influence of bonding state between the bridge deck pavement and the bridge panels are considered. The results provide some theoretical references for design and construction of the bridge deck pavement at the tip position.The temperature stresses of bridge deck pavement are calculated under the condition of continually temperature drop. The influence of asphalt concrete performance on thestress state of the deck pavement is analyzed. In order to discuss the influences of crack width, the range of temperature drop and the initial temperature on the stress distributions of asphalt concrete pavement, many cases are calculated as a crack in the cement concrete deck existed. The mechanism of the fatigue damage of bridge deck pavement and its mechanical performance parameters are studied, and its fatigue life of the bridge deck pavement is predicted under the vehicle and temperature loads. The results in this dissertation can be used to guide the design and construction of the bridge deck pavement.