Study On The Optimal Design Of Prestressed Concrete Continuous Rigid Frame Bridge

Now, with the scientific and technological advancement and people’s living standards improvement, at home and abroad the continuous rigid frame bridge study more and more. But the selection of some of its main design parameters is still not fully establis hed on the basis of scientific and precise. The deviation of design and construction ofte n lead to serious project accidents. So the selection and optimization of the design para meters of the continuous rigid frame bridge is very important for the transportation safet y and economy. Therefore, there is need for greater efforts in our country of prestressed concrete continuous rigid frame bridge design parameters study, which is of great signi ficance. The design parameters of the span ratio, the main pier size and the bottom cur ve form are the main research.Combining with the engineering example, established 3 representative numerical mod els, analyse and compare the bending moment of the critical section girder which come from the different span ratio under displacement in the action of dead load; Secondly,c arry out the research of prestressed concrete continuous rigid frame bridge main pier siz e. Summary and analysis of the ratio of height and span value experience and character istics of domestic and foreign bridge and built 3numerical model, the key section of ma in girder different pier size in the action of dead weight and load of the motor under t he stress and displacement analysis; Finally, learn the prestressed concrete beam bottom of curve continuous rigid frame. Combined with the engineering example, established 3 representative numerical models, analysis and comparison of the prestressed concrete con tinuous rigid frame bridge in the force and displacement curve form different beam bott om.Through the above research, understand the design parameters of the main effects o f the stress and displacement of the structure, based on finite element theory, analyse the mechanical characteristics and mechanical behavior of the continuous rigid frame bri dge, make clear the relationship between the main parameters of the main parameters, o ptimization design, makes the design and construction of continuous rigid frame bridge i s more reasonable.