Ross Wood's Activities

LEAP Steel Wind Load Application and Lateral Moments

Leo Marcatelli — Thu, 15 Oct 2020 14:16:42 GMT

I have applied wind to my model at the Initial stage, to check the bare steel under its self weight + wind and at Final, to perform the standard Strength I, III, V checks.

I would like some clarifications:

How is the wind applied? In the wind input form, I checked user input and input a pressure. Will Leap determine the load on the flange (k/ft) per LRFD 8^th 4.6.2.7.1-1?
In the initial condition ( steel only), will LEAP apply wind to all beams, top and bottom flange? And if not , how can I achieve this?
In the final condition , will LEAP apply wind to the bottom flange of the fascia girders only? And if not , how can I achieve this?
Is LEAP computing the wind moment and stresses per LRFD 8^th C4.6.3.2.7.1-3? And if not , what calculations does it use?

Thanks,

Leo Marcatelli

LEAP Bridge Concrete Superstructure

Ross Wood — Wed, 24 Mar 2021 19:15:04 GMT

Is it possible to define a bridge with non-parallel abutments where every prestressed beam length is different?

I have created a file with supports that have different skew angles, and the rendering looks correct, but when I do the analysis all the beam lengths are the same and all the self weight force effects are the same, and seemingly based on the span length measured along the alignment only. I have 15 beams to investigate, it would be nice to have them all in the same file instead of making 15 separate files!

OpenBridge Designer Standalone Request

Ross Wood — Tue, 06 Apr 2021 20:03:48 GMT

Bentley,

Would it be possible to change OpenBridge Designer to allow the user to do more with the individual standalone files than just delete them. For example I would like to copy, rename, and reorder my files shown in the picture below. The only way for me to do that is to open each file and save as in the order in which I want them to appear, and then I have to delete the old files. Thank you, Ross

Leap Bridge Steel and Pier Design

Richard Bloch — Mon, 02 Apr 2018 15:04:25 GMT

I'm trying to model an existing bridge with construction modifications to determine it's bearing pressure for a pier.

I know that Leap Steel is LRFD only however, when I analyze the pier there is an option to use LFD. I change to LFD, input all the loads and then run analysis. I appear to get good output. If I leave bridge steel after saving and then want to modify the pier loads rc-pier starts off in LRFD again, if I change it to LFD then it deletes all the loads I have inputted?

I'd like to run the analysis in LFD to see if I can match the original design and then I plan on modifying the bridge as needed for construction.

Is there a way to analyze the piers using LFD in Leap Steel?

Thanks,

Rich

LEAP Bridge Steel Pier/Abutment Locations

Ross Wood — Thu, 06 Aug 2020 01:32:18 GMT

In LEAP Bridge Steel, when defining the Pier/Abutment Locations, what exactly is the user defining when they input a station for an Abutment aka Support 1. Is it the centerline of bearing for the girders? Or is it the centerline of the abutment stem?

All three tutorials included with LEAP Bridge Steel have the centerline of the bearings and the centerline of abutment stem fall on the exact same station, so I cannot determine the best practice to define a bridge that has bearings which are offset from the abutment stem centerline.

I have experimented with the bearing line offset input and I see that it will move the bearings relative to abutment stem centerline; however, the girder ends always extend to the centerline of the abutment stem.

As it stands now, I cannot figure out how I can configure LBS to model something like the attached graphic. I would appreciate some guidance, thank you -Ross

AASHTO LRFD load modifier eta for LBC Substructure

Ross Wood — Thu, 30 Jul 2020 15:35:54 GMT

Does anyone know how to specify the AASHTO LRFD load modifier eta for a LEAP Bridge Concrete pier design? My pier design requires an eta factor of 1.05 for max force effects and 0.95 for min force effects. I am not able to edit the Strength load combination in the loads library, and I'm certainly not manually editing the thousands of load combinations that are generated. Those are the only two locations that I have seen the eta factor. The help file appears to be out of date, as it makes reference to the "A/D Parameter" input, and there's nothing there related to eta. I would appreciate some assistance, Ross Wood.

LEAP Bridge Steel bituminous wearing surface

Ross Wood — Fri, 24 Jul 2020 11:27:30 GMT

I am modeling a bridge in LBS that has a 2.625" bituminous wearing surface; however, I do not see an option to include this information in the model. When I define the vertical curve, the model places the crown of the deck right on the profile grade line. This means that all my deck and steel elevations are 2.625" too high.

Is there a way to easily incorporate the depth of pavement into the model so that my elevations are correct?

Do I have to edit the elevations of my PVI to reflect the pavement depth? That seems like a poor workaround.

LEAP Bridge Steel Wind Load

Ross Wood — Wed, 15 Jul 2020 23:11:39 GMT

I have created AASHTO LRFD Strength III and Strength V load cases and defined wind loads; however, I do not see where these loads are reflected the output for the lateral flange stresses?

What exactly are the capabilities of LBS with regards to lateral wind loads? Are they included in the code checks?

Thanks, Ross Wood

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Wed, 15 Jul 2020 20:53:44 GMT

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