Stress Analysis Of Steel Bridge Pavement And A Study On Harmonic Analysis Of Frame Structures

The steel box girder bridge has been widely used due to their light weight, easy to transport and erect, and its short construction period. However, the steel box girder bridges may undergo significant global deformation as the structure is rather flexible, and may also occur large local deformation due to the fact that the deck is orthotropic. As a result, the pavement is likely to yield early damage. In order to avoid the early damage of the pavement, the mechanical behavior of the pavement under load should be predicted. This paper presents a study on the advanced methods for the analysis of pavements, and carries out two aspects of researches on the pavement of HongKong-Zhuhai-Macao Bridge, the temperature field and the mechanical response of the pavement under traffic loads.The steel box girder bridges are sensitive to temperature changes as the steel is a good heat conductor, so the changes in temperature have a greater impact on the pavement's performance. This paper analyzes the temperature field of the box-beam cross-section by the finite element method, and the maximum working temperature of the steel bridge's pavement and the maximum temperature gradient of the box-beam cross-section are obtained. The temperature gradient obtained is close to that specified in the design code. So the thermal stress can be calculated according the design code. The analysis of response of pavement under traffic load is a complex problem as the structure of the bridge is complex, and there are many combinations of the location where the vehicle load is applied. In this paper, a continuous steel box girder bridge model which considering both the effect of the whole structure's deformation and the local behavior under loads is established, and the maximum tensile stress of the pavement and maximum interface shear stress between pavement and steel plate under the unfavorable load case are obtained by analyzing and compare of the situations that the standard axle loads specified in the <General Code for Design of Highway Bridges and Culverts> are applied to different positions of a lane.This paper also researched on the method for analysis of harmonic vibration of frame structures based on the exact elements, and proposed a new direct algorithm. It shows that the new method got a significant improvement in computational efficiency compared to the conventional methods.Finally, it summarized all the work and prospected the future work.