Tips & Tutorials Substructures Moving Load Structural Analysis Moving Load Analysis Solid Slab Bridge Computational Modeling Computer Modeling Concepts Reinforced Concrete Wood-Armer Moments
This case study covers the following aspects:
The centrifugal force (Horizontal Moving Load) has two components, the radial force and the overturning force. The radial component of the centrifugal force is assumed to be transmitted from the deck through the end cross frames or diaphragms and to the bearings and to the substructure. The overturning component of centrifugal force occurs because the radial force is applied at a distance above the top of the deck. The overturning component causes the exterior wheel line to apply more than half the weight of the truck and the interior wheel line to apply less than half the weight of the truck by the same amount. Thus, the outside of the bridge is more heavily loaded with live load. The overturning force is computed by taking the sum of the moments about the inside wheel and setting the sum equal to zero. The result is that the outermost girder will receive slightly higher load and the innermost girder will receive slightly lower load. Thus, it is also necessary to compute the condition with no centrifugal force, i.e., a stationary vehicle, and select the worst case.
Bridge Analysis midas Civil Tips & Tutorials Moving Load Live Load Structural Analysis Vehicle Loads Approximate Method Refined Analysis Analysis Results Transverse Moving Load
When a static concentrated load is applied on a deck, the deck will deflect transversely as well as longitudinally, similar to the structural behavior of a two-way slab. The load distribution becomes more complex when multiple point loads are applied to the deck, such as truck loads. When the structural model is simplified to a 2D frame model, it is important to obtain the resulting 3D forces from the 2D model.
Tips & Tutorials Moving Load Load Distribution Structural Analysis Vehicle Load Distribution Approximate Method Refined Analysis AASHTO LRFD Bridge Superstructures Live Load Distribution Factor
The difference between lane element and cross beam element for vehicular load distribution is in considering the transverse rigidity of the system and the kind of model generated (line, plate or grillage model)
PSC Bridge CS454 Bridge Assessment Tips & Tutorials Precast Concrete Bridges Moving Load Moving Load Analysis All Model 1 All Model 2 Live Loads
In midas Civil 2020 v2.1, PSC bridge assessment as per CS454 has been newly implemented. During the online session, moving load analysis with All Model 2 and special vehicles will be demonstrated. Using the analysis results, assessment load effects and assessment resistances will be obtained, and they will be verified using adequacy factor and reserve factor. Ultimate limit state (Flexure, shear and torsion) and service limit state verification is provided in the tabular format and MS excel report.
Dynamic Analysis Transverse Analysis PSC Girder Bridge Project Tutorial Bridge Wizard Moving Load Live Load Structural Analysis Moving Load Analysis Vehicle Loads Transverse Lane Optimization Prestressed Composite Bridge Wizard Traffic Loads
The moving load is one of the most important considerations in the bridge design. In this course, we tried to broaden your understanding of vehicle load to get accurate moving load results. In addition, we discussed in detail how it affects the analysis results depending on how to define traffic line lanes and vehicles. It will be helpful to most of bridge engineers who handles moving load factor on a daily basis.