Study On Design Parameters Of The Main Beam And The Main Pier Of The PC Continuous Rigid Frame Bridge

In recent years,with the rapid development of Expressway,more and more long span continuous rigid frame bridgeuse in rivers across the valley,then some problems are gradually exposed,the crack and excessive deflection in the midspan is most prominent in the concrete bridge research staff have launched research,and strive to optimize the structure design parameters in order to solve the various problems faced on the application development of the continuous rigid frame bridge.In this paper,the design parameters of the continuous rigid frame bridge are comprehensively expounded,including the high span ratio,the ratio of span to span,the variation curve of rigidheight,the form of prestressed beam,the distance and thickness of the main pier.At the same time,the content and method of calculation of thecontinuous rigid frame bridge are summarized,and the traditional design theory and design theory of zero moment of dead load were analyzed,found dead load zero moment theory although reasonable but is somewhat idealized,difficult to popularize in engineering practice.The design parameters of different span the scope of this study,so this paper determine Mao Pi Zi bridge and Dong An bridge two continuous rigid frame bridge project,combined with the finite element simulation of actual engineering,and analyze the internal force of dead load,moving load,the overall temperature of MVmax,found that the larger internal force value exists in the cross beam and the pier top of piers,provides certain reference value for the study of selected cross-section parameters.Based on engineering examples(Dongan bridge,Mao Pi Zi bridge)on the basis of the research work is limited the range of design parameters of main pier,focus on wall thickness,double limb center spacing study of solid double thin-wall piers,by means of statistical analysis,to study the size of stress and displacement was calculated by MIDAS /CIVIL changes summary,evaluation of different span thickness range,while the introduction of double thin-wall piers slenderness ratio range of range values for different spacing of double limb span limit.Through the analysis of the data,in a reasonable economic hole are summarized based on different span under the side span ratio of the approximate range of summary data of domestic design;continuous rigid frame bridge,the initial root,height span ratio in the design range;in the power curve of the floor changes,simulation curves ofdifferent power structure using MIDAS/CIVIL,displacement and weight,stress analysis and evaluation and evaluation of synthetic evaluation index curve of the floor,put forward different span under the reference plate change curve of the range.