Finite Element Simulation Analysis Of PC Continuous Rigid Frame Bridge Based On The Three-dimensional Block Element

Prestressed concrete bridge are widely used in practical bridge due to a large span, simple construction, driving comfort and other characteristics. Currently, plane linkage element is used to simulate continuous rigid frame bridge for static analysis and calculation. Linkage element can calculate the overall force performance of the structure, but it can only calculate the plane stress of linkage element and can not consider the axial stress along the lateral distribution as well as stress of horizontal, vertical, and the rest of direction. In addition, it can not be obtained that accurate stress levels and distribution for the complex areas of three-force to use linkage element. For these reasons, there may be a security risk for structure design of the prestressed concrete continuous rigid frame bridge.The three-dimensional block element model is able to more accurately simulate the force structure under complex structure. However, the traditional finite element program can not obtain accurate force results for the calculation of the three-dimensional block element model since it can not simulate shrinkage and creep effects of concrete. This paper focuses on accuracy of the finite element simulation analysis method(due to shrinkage and creep) based on the three-dimensional block element model by finite element software Midas Fea, and discussing on analysis results of continuous rigid frame bridge based on the three-dimensional block element.This paper firstly verifies correctness that Midas Fea calculates the three-dimensional block element model construction(considering shrinkage and creep) by numerical examples.On the basis of it,the paper takes the prestressed concrete continuous rigid frame bridge- Liuxihe bridge, spans of 73m+125m+73m,as an example. Then establishing linkage finite element model in software Midas Civil and three-dimensional block finite element model in software Midas Fea, comparing the results of three-dimensional block model to linkage model based on Liuxihe bridge, which verifies the applicability of linkage finite element method.And taking a detailed analysis for the uneven distribution of longitudinal stress along the lateral bridge and zero block of pier beam consolidation area.This paper concludes as follows:(1)Verifying correctness that Midas Fea calculates the three-dimensional block element model construction(considering shrinkage and creep) by numerical examples.(2) Studing vertical force results of prestressed concrete continuous rigid frame bridge based on three-dimensional block element model, which verifies the accuracy and applicability of linkage finite element method.(3) Studing the lateral force results of of prestressed concrete continuous rigid frame bridge based on three-dimensional block element model,which checks the accuracy of lateral stress results to use plane frame method.(4) Studying force results of zero block(pier beam consolidation area) force based on the three-dimensional block element model,which shows spatial snalysis results that linkage element model can not provide.