Research on Grillage Method Specific Division in Modeling of Continuous Box-girder Bridge

The article takes the Chentang Bridge mixed lane as the object of study.It is a 4×25m continuous box-girder bridge made up of 4 split composite box-girder.With large finite element software Midas/civil,the element model is established by grillage method,and 1/50,1/25,1/12.5,1/10,1/5 beam length is used to divide grillage respectively.With the comparison of the space model and the actual bridge test data,the comparison of five kinds of grillage division across strain and deflection is analyzed in two load conditions,which provides a theoretical basis for bridge inspection.