The Research Application Of The Ribbed Slab System In The Bridge Engineering

The unity and bearing capacity of bridge rely on the main girder's cross-section dimension, computing span and lateral rigidity. There are different methods to maintain the bridge unity in bridge designing. By research, we find that the main girder's spacing of rib is the pivotal factor of the diaphragm's setting. So the problem of the diaphragm's setting can be resolved. For the ribbed slab bridge of close-packed, the transverse distribution coefficient of the side beam increase with the increasing of the diaphragm's number, but the transverse distribution coefficient of the median beam reduce with the increasing of the diaphragm's number. The calculation indicated that the ribbed slab bridge of close-packed may not set diaphragm (but in the engineering, we often use end cross-beam and inner diaphragm). For the ribbed slab bridge of sparse-packed, the transverse distribution coefficient of the side beam and the median beam reduce with the increasing of the diaphragm's number. The calculation indicated that the ribbed slab bridge of sparse-packed should set diaphragm according to the fact. The distance of diaphragm may use the method that this paper put forward. The structure of beam grillage composed by diaphragm and main girder. By research we find that the transverse distribution of the structure of beam grillage is strengthened. It is not to say that bridge deck slab have no effect on the transverse distribution. We consider that the ration of the longitudinal rigidity of the main beam and the lateral rigidity have pivotal effect on the transverse distribution.The internal force of bridge deck slab can be analyzed through the method that set model. The result of calculation compares with the regulation in " specification ", it can be as to a kind of supplement calculating about the internal force of bridge deck slab in " specification ".There are several methods about transverse distribution .By research, it is suitable to calculate the ribbed slab bridge of sparse-packed with the method of eccentric compression consider constraint torsion. At calculating continuous beam bridge, using the method that the equivalent span combination with the eccentric compression considering constraint torsion is suitable, it is closed to the ANSYS'. So, it proves that this method has practicality.