| Curved girder bridges have been widely used in urban road construction. For the complex mechanism, the relevant theories for calculation and design is attracting much concern from bridge engineers. Especially, the calculation of the transverse load distribution of curved girder bridges has become a hot research subject. Many researchers prefer studying the laws of transverse load distribution to determine the bridge internal force and finding a practical method for curved girder bridges. In this thesis, the author studied the transverse load distribution problem of curved girder bridges mainly in terms of the following work:(1)The essence of the transverse load distribution calculation for curved girder bridges was studied; the difference between transverse load distribution and transverse internal force distribution was clearly distinguished; and the generalized beam-grid method was further discussed.(2)Based on the transverse internal force distribution for simply curved supported girder bridge, the calculation formula of transverse internal force distribution for continuous curved girder was derived. Calculating table was given by massive calculation.(3) The problem of radius vector load lateral distribution for curved beam bridge was analyzed. Due to the effect on radial torque, the influence line of the transverse internal force distribution was changed and eventually, the transverse internal force distribution coefficient would be decreased in inner beam while increased in external beam,it shows that we should consider the effect of the centrifugal force when design the curved girder bridges,particularly in high speed and small radius.(4) Based on the field test in Huaneng bridge (simply supported-continuous 6×25m) and analysis of the measured data, the transverse distribution of the bridge was obtained. The reliability of using generalized beam-grid method to calculate the transverse distribution for continuous curved girder was further verified.
|
PDF Full Text Request