Research On Parameter Influence And Calculation Analysis Of Load Transverse Distribution For Reinforced Concrete Beam Bridge

With the development of economy, the speed of national infrastructure construction isaccelerated. Small and med-span bridges have occupied an important proportion in bridges.Prefabricated concrete bridge is widely used in small and med-span bridges, because ofsimple structure, convenient to prefabricate and conducive to standardization construction.The calculation analysis of transverse distribution coefficient becomes the key to ensuresafety and reliability of this bridge.Traditional simplified calculation method of load transverse distribution has its scopeof application. It makes some assumptions in the theory, which results some differencebetween computation result and actual situation. Hinge jointed plate and rigid-joint slabmethod are suitable for the simply supported bridge, but not to continuous beam bridge.Rigid cross beam method does not consider the influence of main beam shear deformationand can not solve the lateral distribution at any longitudinal position. It has importantpractical value for traditional simplified calculation method to improve the theory andenhance the engineering applicability. In addition, the change of bridge structure parameterscan cause difference of load transverse redistribution. It is also important to analyze theeffect of parameter and improve the computing theory. Therefore, on the basis of anlyzingth research at home and abroad, this paper studyes calculation precision of G-M method tocalculate the load transverse distribution; expands the applicable scope of hinge jointedplate and rigid-joint slab method; improves rigid cross beam method considering main beamshear deformation and analyzes the influence of structure parameters on load transversedistribution. The following work is carried out:1. The research background and significance of load transverse distribution is analyzed,and the concept of load transverse distribution is introduced. The current research status ofload transverse distribution is summarized. On the basis of analysis for researchs at homeand abroad, the main research content in this paper is presented. 2. The significance and calculation principle of transverse distribution coefficient isexpounded, and the applicable condition of simplified calculation method is analyzed. Thesummary of calculation process for each load transverse distribution calculation methodprovides the theoretical basis to improve analysis and expand applicability.3. The prefabricated concrete simply supported T beam bridge with five beams isselected as research object. Transverse distribution influence line is calculated by G-Mmethod, single beam finite element method and spatial finite element method. Contrastiveanalysis has verified the accuracy of G-M method to calculate load transverse distribution.4. The applicability of hinge jointed plate and rigid-joint slab method to compute loadtransverse distribution is improved and expanded. They are used to calculate the continuousbeam bridge. On the basis of analyzing the basic theory of rigid cross beam method, thecalculation method considering beam shear deformation is presented. The solved loadtransverse distributions at any longitudinal position are consistent with results from spatialfinite element method, which verifies the effectiveness of improved method in this paper.5. With simply supported T beam bridge as the research object, the influence of span,diaphragm beam number, diaphragm beam stiffness and oblique angle on load transversedistribution is studied. This provides a reference for the improvement of calculation theoryand improves calculation precision and adaptability of load transverse distributioncalculation theory.