Research on Modified Rigidly-jointed Beam Method for Load Transverse Distribution for Prefabricated T-beam Bridges
In the traditional rigid-jointed beam method used for calculating the load transverse distribu-tion of prefabricated T-beam bridges,factors such as longitudinal bending moments are overlooked,leading to discrepancies between calculated results and actual scenarios.To enhance the accuracy of calculating the load transverse distribution in prefabricated T-beam bridges,the rigid-jointed beam method is improved by integrating results from three-dimensional finite element model analysis.A load lateral distribution calculation method is proposed that considers the stiffness correction of the main girders.Considering the influence of longitudinal bending moments and similar factors on the vertical and torsional stiffness of the main girders,an effective length factor is introduced as a modifia-ble parameter.This factor is employed to develop an objective function grounded in the live load dis-tribution as determined by finite element analysis.Subsequently,the interior point method is utilized to optimize this objective function,leading to updated stiffness parameters.These parameters facili-tate the calculation of the influence line for load transverse distribution in prefabricated T-beam bridg-es.Numerical investigations suggest that for prefabricated T-beam bridges with standard spans,the effective length factor associated with the vertical stiffness ranges between 0.5 and 0.6,while the fac-tor linked to torsional stiffness varies from 0.18 to 0.22.The modified rigid-jointed beam method proposed in this research closely aligns with the results from three-dimensional finite element analysis and proves to be effectively applicable in the computation of load transverse distribution for prefabrica-ted T-beam bridges.
bridge engineeringtransverse distribution of loadrigid-jointed beam methodprefabrica-ted T-beam bridgesfinite element analysis
万方数据
维普
