The analysis results include nodal displacements, support reactions and member forces for truss, beam and plate elements. The load combinations are performed separately for both maximum and minimum values. 294 Moving Load Analysis for Bridge Structures The analysis procedure described above produces the maximum and minimum values for one moving load condition, and they can be combined with other loading conditions. Produce the analysis results due to the vehicle movement using influence line or influence surface according to the moving load application method.

Calculate influence lines or influence surfaces for each component by performing static analyses for unit loads that are generated by the traffic lane or traffic surface lane. Define vehicle loads, method of applying the moving loads and traffic lanes or traffic lane surfaces. An analysis procedure for a vehicle moving load using influence lines or influence surfaces can be summarized as follows: 1. The components of results that can be calculated for influence lines or influence surfaces include nodal displacements of the structural model, member forces for truss, beam and plate elements, and support reactions.

An influence surface represents a specific component of analysis results obtained from static analyses of the traffic lane plane of a bridge structure subjected to a unit load located at the plate element nodes and is presented on the points of load application. An Influence line is presented on the traffic lane and represents a specific component of analysis results obtained from static analyses of a bridge structure subjected to a unit load moving along the traffic lane. In order to carry out a moving load analysis, we define vehicle loads, traffic lanes or traffic surface lanes and the method of applying the vehicle loads, and then we apply a unit load at various points to traffic lanes or traffic surface lanes to calculate influence line or influence surface.

Important features are included as follows: Generation of influence line and influence surface for displacements, member forces and reactions due to moving loads Calculation of maximum/minimum nodal displacements, member forces and support reactions for a given moving vehicle load using the generated influence line and influence surface Moving load analysis of a bridge structure entails a series of analyses for all loading conditions created along the entire moving load path to find the maximum and minimum values, which are used as the results of the moving load case. ANALYSIS FOR C IVIL STRUCTURES Moving Load Analysis for Bridge Structures The moving load analysis function in MIDAS/Civil is used to statically analyze and design bridge structures for vehicle moving loads.

Midas civil distributed loads