MDX webinar Q&A log (Questions and Development Requests for Steel Bridge Design in midas Civil)
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*Overall, the best resources for more inforamtion are:
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http://manual.midasuser.com/EN_Common/Civil/881/index.htmOnline help manual
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https://www.midasoft.com/learning/bridge/tag/tutorialTutorial page
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https://www.midasoft.com/learning/bridge/tag/project-applicationOther application page
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http://globalsupport.midasuser.com/helpdesk/KBmidas Civil FAQ
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https://www.midasoft.com/general/support/supportpage
More support and technical resources
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QuestionsCriteriaItem TypeAnswer TypeAnswerReference
*Overall, http://manual.midasuser.com/EN_Common/Civil/881/index.htm our online help manual is a great source of information.
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I use the steel composite bridge wizard, and once I've created a model using steel bridge, and have adjusted/added loads, it is very difficult to adjust the section locations, or the diaphragm locations. You either have to recreate the model from the wizard, or you have to painstakingly move all the nodes around to adjust the locations. It would be nice for the steel design to have an easier way to change section locations if the design is not working.1. ModelingEasier modeling (parametric, complex geometry, sections, modification, etc.)New parametric model for complex steel bridges
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I am planning to use it in one of the bridges that we are designing, the bridge is flared and curved, I will see how Midas Civil will handle the geometry, I know the wizard is for constant width curve bridges, and the bridge below I guess it represents the same issue that I will face during design.1. ModelingEasier modeling (parametric, complex geometry, sections, modification, etc.)New parametric model for complex steel bridges
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Should improve the way the diaphragm/cross beam input. Try to make it easier. Easier way to input non-radial curve girders bridge.1. ModelingEasier modeling (parametric, complex geometry, sections, modification, etc.)New parametric model for complex steel bridges
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Adjusting alignment of the bridge in Midas is very hard. For example if the curve radius changes during design. MDX is super easy to change that. But i guess Midas is more raw modeling while MDX is more prescriptive or "black box" modeling.
MDX is not great. However, it is easy to use and (most importantly) it is really easy to iterate within MDX and complete a large number of design variations in a short amount of time in order to determine the most advantageous framing layout, section properties, etc. If Midas could achieve this ability to iterate quickly, our office would move away from MDX in favor of Midas. The reason we continue to use MDX is that it is so fast and simple to iterate within MDX.
1. ModelingEasier modeling (parametric, complex geometry, sections, modification, etc.)New parametric model for complex steel bridgesTo change the curve radius, you can re-run the wizard in MIDAS. This will quickly update the model to reflect the new curve radius.a
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I am just going to be brief of typical industrial practice of steel girder bridges design. AISC Guidelines 13.1 highlights more detail about the recommended level of analysis for different types of steel girder geometry.1. ModelingModeling GuidanceNew parametric model for complex steel bridges
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A more robust 3D beam plate and element model when we get to a more complex bridge, for example tight radius curved girder composite bridge. As far as I know, we even carry it to the next level to capture the staging in the analysis. One common problem that we all recognized is the post processing of analysis results to be compatible for specification check. Currently, we use Midas for the analysis and populate the result into a spreadsheet outside of Midas, manually translate the forces into a format to be compatible for specification check using in-house spreadsheet. We also have to define the bracing and stiffener locations in spreadsheet.1. ModelingPlate-element modelingNew parametric model for complex steel bridges
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Suggestion - 4. Kudos to Midas for adding the warping constant in the beam element analysis. Can Midas provide more validation example using 7th degree freedom in the analysis? This will boost our confidence to use it in the analysis.1. Modeling7th DOF/Warping for Beam ModelingThis feature is currently supported. Check the reference.Refer to the verification document.b
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Can you highlight or go over modeling deck using cross-beams, especially for staged constructed hwy bridge with a closure pour.1. ModelingConstruction StagesThis feature is currently supported. Check the reference.Please refer to the tutorial/application cases.c
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If there are additional features I would live to see in future version is this also a good place to express them?1. ModelingFeedback PlatformThis feature is currently supported. Check the reference.Please use our techncial support web board idea forum at: http://globalsupport.midasuser.com/helpdesk/Ideas
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It is my understanding that if it is routine straight composite bridge, we will typically just use line girder analysis with live load distribution factor. We will can evolve the model to a grillage model for refined live load analysis especially on the heavily skewed girder bridge.1. ModelingModeling GuidanceThis feature is currently supported. Check the reference.
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Would like to see some discussions of the boundary conditions definition for girders with guided bearings.1. ModelingModeling GuidanceThis feature is currently supported. Check the reference.Boundary condition can be defined in the following ways:
- Define fixity in DX,DY,DZ,RX,RY,RZ, and RW (warping) directions.
- Define specific stiffness value and type (linear, compression only, tension only, nonlinear, 6x6 matrix) in DX,DY,DZ,RX,RY,and RZ directions.
- Define specific stiffness and type link and apply support or substructure at the vertical end.
d
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Can you get 10th points in MIDAS output with out defining nodes at those locations?1. ModelingModeling GuidanceThis feature is currently supported. Check the reference.Yes, you can check on "Generate 10th points" option in the wizard. Once the model is created, you can check their location and output at the 10th points. The 10th point results can be extracted in table or excel format toou
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Midas will be even greater tool especially in curved and heavily skewed girders if Midas can incorporate plate element in the modeling.1. ModelingPlate-element modelingThis feature is currently supported. Check the reference.e
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How does MIDAS handle multi-span curved girder bridges with ramps?1. ModelingWizardThis feature is currently supported. Check the reference.To use the multi-span multi-curve data, you can use the Advanced Curve dialog box, in the Advanced Curve (Multi-Curve) function in the Composite Girder Bridge Wizard.f
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How can I define the proper curvature of curved bridges. MDX gives me the option to enter radius of curvature at every 10th point. But in Midas I think it only allows you to give a single radius of curvature for an entire span.1. ModelingWizardThis feature is currently supported. Check the reference.f
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Is there a plan to add Arema loading? What AREMA capabilities does MIDAS design have?1. ModelingThis feature is currently supported. Check the reference.Yes, MIDAS incorporates Arema loading such as Cooper E-80g
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b.Another HUGE feature to add would be a way to change the coordinate system from X, Y, and Z to Station, Offset, and Elevation similar to the way a bridge is laid out. This really helps when you have a curved structure and need to make some changes to a model. This can be done by defining a curve or complex curve to be the "X" coordinate, the "Y" coordinate would be the perpendicular offset from the complex curve and Z would remain the same. This feature would be a HUGE help in modeling any bridge that isn't a straight bridge.1. ModelingEasier modeling (parametric, complex geometry, sections, modification, etc.)This feature is currently supported. Check the reference.&New parametric model for complex steel bridgesUsers can define the layout using station, offset, and elevation values.
MIDAS will also develop a new complex steel bridge modeler which will allow parametric modification.
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a.I would like to be able to apply a moving load in the X or Y directions instead of only the vertical direction. This would greatly help in modeling the breaking force and centrifugal force more accurately.1. ModelingApplication of the breaking force and centrifugal force in live load analysisThis feature is currently supported. Check the reference.&To be added in the development request list for the evaluationUsers can apply the breaking force and centrifugal force in the post-processing. We are currently trying to improve this by adding the breaking/centrifugal force modeling feature in the pre-processing part.h
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Suggestion - 1. Integrate a post processing feature that can translate the beam-plate element into forces/stresses for specification check in Midas or outside of the program.1. ModelingPlate-element design checkingThis feature is currently supported. Check the reference.&To be added in the development request list for the evaluationMIDAS Civil allows users to translate the beam-plate element into forces/stresses for specification check. The specification check in MIDAS is not yet available but will be developed in the future.i
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It would be useful to have a built in lightweight concrete option.1. ModelingDatabaseTo be added in the development request list for the evaluation
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Midas will be even greater tool especially in curved and heavily skewed girders if Midas can incorporate plate element post-processing for specification check. Suggest to make the spec. check more transparent.1. ModelingPlate-element design checkingTo be added in the development request list for the evaluation
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Please discuss extracting the correct flange lateral bending stress results from MIDAS when using elements with the warping torsion degree of freedom activated.1. Modeling7th DOF/Warping for Beam ModelingTo be developed by 2019 4Q.To find out the lateral bending moment for bottom flanges, we also recommand plate modeling. Plate modeling isn't the most optimum in the current modeling environment. Therefore, we will develop an advanced parametric modeler for complex steel bridge plate-element modeling.
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Suggestion - 3. Incorporate plate element nonlinear accumulative staging analysis. I think this will give Midas an advantage compared to other available commercial software.1. ModelingPlate-element post-processingTo be developed by 2019 4Q.This improvement will be incorporated in the 2nd half of 2019.
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When modeling cross beams for accounting transverse deck stiffeness, is it okay for cross beams to overlap? Do they need to be oriented in a particular direction radial or follow skew?1. ModelingCurve Skew StructureYes, cross beams can overlap. However, the minimal overlap should be strived for. Ideally, cross beams should be perpendicular to the main girders.
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Can we import Microstation Drawing into Midas Civil?1. ModelingFeedback PlatformIf you save your Microstation file as DXF format, you can import to MIDAS. The layer/group information is also maintained.j
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Can Midas Civil be used for steel box girders like MDX can?1. ModelingSectionYes, midas Civil can be used for Steel Box girders like MDX.k
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I am currently working on steel tub girder bridges. I would like to know if it is possible to define transverse flange stiffeners (TFS). The bridges that I am modelling has Transverse flange stiffeners present above the Longitudinal bottom flange stiffeners. To my knowledge MDX does not allow me to define TFS, is it the same for Midas also?1. ModelingSectionYes, You can define Transverse Stiffeners in Design -> Composite Design -> Transverse Stiffeners.
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Is using SRC necessary for design steel composite bridges?1. ModelingSectionYes, Steel composite sections can be designed using SRC option only.
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How we model concrete in bottom flange Tub Girder in MIDAS?1. ModelingSectionConcrete can be defined in bottom flange of the Tub Girder by using a special tool called Composite Section Calculator. Please refer to the following link for more detailed usage of the feature:
https://www.youtube.com/watch?v=MfK8YYUrqIo
https://www.youtube.com/watch?v=MfK8YYUrqIo
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Are the inputs pre-generted with industry standards, such as wet concrete weight?1. ModelingSectionStandards are built in as default values. However, any specific standard requirements should be specified manually.
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None at this time, but am very interested to see how you present the advantages of using MIDAS over MDX for simple span steel multi-girder bridges.1. Modeling
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I have not used Midas for steel design but my hope is that it will analyze the girders using a 3-D model for the various stages (initial construction sequences, multiple concrete slab pours, and of course final design).2. AnalysisConstruction StagesThis feature is currently supported. Check the reference.Yes, your understanding is correct. MIDAS will model the bridge as a 3D morel to analyze various construction stages including sub-structure, girder placement, and slab pouring. This can be followed with a code specific design, and rating.c
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Can you give some numerical comparison for skewed and curved bridges? What are the differences and how to justify which one is accurate? Thanks.2. AnalysisCurve Skew StructureThis feature is currently supported. Check the reference.We've developed FHWA design guide III (three span curve/skew I-girder bridge) with the analysis reuslts. Refer to the related documents.l
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Consider staged construction models for rehabilitation as well, such that construction stages allow for loads in previous stages to become permanent and load cases/combinations for vehicular live load can be added with typical reduction factors.2. AnalysisThis feature is currently supported. Check the reference.
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Do you have any comparison study of curved composite steel girder bridge between MIDAS and MDX (grid model)? On items like reaction, moment and shear. If you guys have, that will be really helpful. The results from MIDAS and MDX seems not match very well.2. AnalysisThis feature is currently supported. Check the reference.Refer to project application examples like https://www.midasoft.com/learning/bridge/interaction-between-superstructure-and-substructure-soil-structure-interaction-and-settlement-analysis-midas-mdx-comparison-1
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I have been using MIDAS in conjunction with our "standard" analysis / design tools for about half-a-year now to compare and hopefully use more go-to.

On traffic / live loads using Traffic Line Lanes:
*The "new" optimization isn't as well documented as the defined lanes. I seem to be getting similar results to other programs, but a design example or explanation of best practices with this tool would be helpful to ensure it is used properly.
*Saving a library of user defined vehicles. There was some "macro" I think I saw for achieving this, but a direct way to save the standard state overload trucks and load it easily into each project would be a great feature.
2. AnalysisThis feature is currently supported. Check the reference.t
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Simplify how composite sections are defined and activated as they apply to the 3 stress states2. AnalysisThis feature is currently supported. Check the reference.Sections can be defined in the section tab Properties > Section Properties
Section can be activated in the Composite Construction Stage analysis, and the various parts including the girder, and the deck can be activated using the Add/Modify Composite Section for Construction Stage.
m
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Is there a way of generating moment and/shear diagram from MIDAS directly instead of exporting the results tables and plotting the graph manually from excel?3. Post-ProcessingModeling GuidanceThis feature is currently supported. Check the reference.Yes of course, When you right click in MIDAS Result Tables, you can find "Diagram" option where you can set up your X axis, Y axis, title, etc. for drawing the diagram within midas Civil.n
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Simplified method of resolving forces for plate and shell models into global effects on the total shape. The current method (wood armer, etc) requires a fairly detailed input for each location. If you can come up with a wizard for resolving force effects for plate and shell steel I and tub girders that would be extremely helpful and provide a service that MDX can not.3. Post-ProcessingPlate-element post-processingThis feature is currently supported. Check the reference.MIDAS provides a strong feature called Section for Resultant Force to integrate the forces for plate elements in post-processing.i
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When is Midas going to implement the feature to imbalance the vertical loading on wheels due to CE load effects? MDX, LARSA, CSI Bridge, etc. all have had this feature for quite a few years. Curved girders cannot current be accurately analyzed using Midas due to the program lacking this feature. The work-arounds that have been suggested by Midas IT are not feasible for actual design due to the number of load cases required and limitations on combinations of design and permit trucks.3. Post-ProcessingLive Load AnalysisTo be developed by 2019 4Q.
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Does MIDAS calculate camber, including deck shrinkage?4. DesignConstruction StagesThis feature is currently supported. Check the reference.o
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Does Midas design cross frames on skewed girders, and take into effect the rotations of the girders?4. DesignCurve Skew StructureThis feature is currently supported. Check the reference.Yes, you can use the 7th DOF (Warping) feature to capture the local buckling effect when using beam elements to model the griders. The effect of the warping will be transferred to the cross beam analysis result and design checking too.
Also, end users can choose to model the bridge using plate elements to accurately capture the rotation effect of the girder onto the cross freames.
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For cross-frame connection evaluation (such as load rating, not design) of steel girder bridge, currently four combination (max-max, max-min, min-max, min-min) of enveloped live load effects of adjoining cross-frame elements are used to check conservatively. If MIDAS can provide the concurrent live load effects of adjoining cross-frame elements, that will be very helpful to reduce such unnecessary conservatism in the connection evaluation.4. DesignLive Load AnalysisThis feature is currently supported. Check the reference.midas Civil can provide the concurrent analysis results for the cross beam elements. Or any other non-major girder elements.p
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How does MIDAS handle variable depth girder design?4. DesignModeling GuidanceThis feature is currently supported. Check the reference.Users can use 1) tapered section function when using beam elements for modeling the girder or 2) model plate elements to reflect the increment. Code checking inside MIDAS is not available for the tapered sections or plate elements.q
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Suggestion - 2. Be more transparent on the specification check in Midas, for example generate a spreadsheet report or something similar.4. DesignThis feature is currently supported. Check the reference.midas Civil generates spreadsheet report for all code checking formula and numbers used for calculations.r
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What AASHTO LRFD code version/edition does midas Civil support now? If the latest version is not supported, what is the plan?4. DesignDesign Checking limitation and improvementThis feature is currently supported. Check the reference.&To be added in the development request list for the evaluationWe currently support 2016 edition. The update to the 2018 version is on it way in the 2nd half of 2019.
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Can MIDAS do LRFD design of Type II Steel composite I girder (exterior girders)?4. DesignDesign Checking limitation and improvementTo be added in the development request list for the evaluation
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Ability to Load Rate a non-composite steel bridge.4. DesignDesign Checking limitation and improvementTo be added in the development request list for the evaluation
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Address girder splice design capabilities4. DesignDesign Checking limitation and improvementTo be added in the development request list for the evaluation
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Is there any possibility for an API in MIDAS in the future?5. Load RatingNew parametric model for complex steel bridgesThis new wizard will have API.
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How could MIDAS be used to check AASHTO Fatigue loads and response?5. Load RatingThis feature is currently supported. Check the reference.https://www.midasoft.com/bridge/civil/promo/ebook-download-civil-aashto
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