Study On Some Problems Of Curved Bridge

Along with the development of transportation and civilization in our country, a lot of curved bridges have been widely applied in the high way and overpass. There have some problems exist in curved bridges, such as: the influence of temperature and linear eccentricity. A curved bridge( R = 75.00m)which is built on the Jiang-Zhu highway is taken as the research object. The influence of the temperature and the dynamic behavior bearing eccentricity are analyzed by using the FEM software ANSYS. Firstly, the application and the status of the curved bridge are summarized. The fundamental theories of curved bridge are discussed. The rigid transverse beam method in calculation of the transverse load distribution and the structural mechanic method in calculation of the lengthwise load distribution are introduced. The finite element method for bridge structure is also discussed. Secondly, the temperature effect on the curved bridges and the codes of some countries about temperature loads are generalized with the influence of the temperature considered. The variable support pressures of the curved bridges with different temperature loads are studied using the thermal-structure coupling analysis method. The support pressure of the curved bridges ( 4 ×20.5m) on five different instances of temperature fields are compared and analyzed. It can be obtained that the support pressure on the two ends is affected mostly by the varying of the temperature. The design basis with the curved bridge can be obtained for the engineers. Finally, the linear eccentricity is adopted in designing in order to reduce the coupling of bend and wring which exist in the curved bridge. Two methods on calculation of the linear eccentricity are given in this thesis. The advantage and limitation of the calculation theories of the seismic forces and three methods of common anti-earthquake analysis have been reviewed. Some examples have been applied to study the influence of the eccentricity on the dynamic behavior of the curved bridge. The results show that the eccentricity has no much influence on the dynamic behavior.