Optimization Analysis Of Design Parameters Of Prestressed Concrete Continuous Rigid Frame Bridge

Prestressed concrete continuous rigid frame bridge with good overall performance of the structure,beautiful appearance,strong adaptability and other advantages,is applied in the mountainous region and other areas.With the continuous updating of science and technology,and more in-depth test results,not only Continuous rigid frame bridge in the use of the process of many problems,but also research on the rationality of the structure of continuous rigid frame bridge continue to conduct in-depth research and analysis,the problem mainly lies in the rationality of the structure design of the continuous rigid frame bridge,because the rationality of the structure design is directly determined by the reasonable design parameters of the design process.It is very important to study the design parameters of continuous rigid frame bridge.First of all,this paper elaborates several theoretical methods which can be used in the analysis of the stress of the continuous rigid frame bridge.Combined with the knowledge of advanced mathematics,the bending moment formulas of the straight section continuous structure and the continuous structure of the variable section are derived by means of the displacement method in structural mechanics and asymptotic method,and the transfer coefficients of variable cross section members are given by means of a list.The analysis of the internal force distribution of components is influenced by the relative line stiffness of pier and beam and the ratio of side span to main span.Secondly,the geometric model parameterization of the river bridge is modeled by the large scale general finite element analysis software ANSYS.Then comparison analysis the action of dead load on the structure stress and deformation and changes by changes of key design parameters of the ratio of side span to main span,the number of beam bottom curve and the relative line stiffness of pier and beam and the beam with large span height ratio.Finally,by using the finite element analysis software Midas Civil combined with the engineering example of Xiao He prestressed concrete continuous rigid frame bridge,the stress and deformation of Xiao He prestressed concrete under the power of the 5 different beam at the bottom of the curve and 4 kinds of different height to span ratio were analyzed.