The abutment cap is failing in negative moment at the exterior drilled shaft location, like shown on the image below: But the moment strength envelope is showing otherwise: There is also an odd decrease of negative moment capacity on the circled…

I have several questions and need clarification on several aspects of the load generation in LEAP Bridge for substructure design. 1. For WS, is the "barrier height" in the Geometry tab used for any other purpose besides determining WS? I want to use…

How could a column for a pier be defined as pinned-pinned. When I select hinge in local direction for any column, it only allows to do it at one end of the column. Is there another way of creating a pinned-pinned condition? This particular column is only…

Hello, I need to run a flared girder analysis with two different beam types on the same span. I have been able to do this for a while without any issues, but now any new model I make with different beam types will give me an error when I re-open it…

I am modeling a single span bridge and I am trying to modify my abutment elevations in the Bridge Parametric Layout tab under Piers/Columns/Footings using the Sections Properties. Once I'm finished I review it in the elevation view to check the elevations…

Hi, Dear Sir/Ma'am, I had a problem with LEAP bridge concrete. The barrier schematic is gone in my model (see picture 2). When I first define it, there are barriers (see picture 2). But when I open the model later, the barriers are gone. Does this affect…

Hi, Dear Sir/Ma'am, What is the "Midspan Increment" for in prestressing tendon input? Please advise. Thank you so much for the help. Thanks, Dong

New video up on my channel giving an in depth look at how to layout beams in OpenBridge Modeler, link below. I cover straight (chorded) prestressed concrete girders as well as curved steel I-girders. Definitely a few things that will save you a lot of…

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…

Hello, I have been experiencing a substantial amount of instability/crashing in LBC 20.00.00.46. The program will randomly freeze and become unresponsive. This happens when I run an analysis, look things up in the help manual, attempt to save, and many…

Can camber calculation methodology be modified from the PCI multipliers to time-dependent analysis / AASHTO equations? Thanks

When checking Show P-delta Effects in the Analysis tab, are the values shown represent values with p-delta effect? For example, are the column/shaft moments magnified with p-delta factor in these load combinations (with a "C" on the end of the LC#)? If…

Hi, I've encountered a scenario in prestressing design where with the decreasing of total number of strands, the Mu provided somehow increases. Attached are two screenshots with different total number of strands & corresponding Mu. -Total number of…

I get the -nan(ind) error during final stress check whenever I provide temperature load for the girders. Is there a solution to this issue? I am using LEAP Bridge Concrete CE 19.02.00.33.

There is an A/D Parameter, under the "Footing" tab to consider effective footing dimensions in analysis of a spread footing. This appears to calculate the effective footing assuming the footing is bearing on soil (as opposed to rock). Is there a way to…

Some state DOTs require x/box beams without CIP concrete deck to be post-tensioned, as illustrated by the image below. The post-tensioned check box in LEAP Bridge Concrete becomes inactive when X-Beam/Box Beam is selected as the beam type. How do I get…

When using the "Generate Default Load Combination" feature, the load combinations generated are using different factors, like : - 1.4 for WS for STR GP 3, - 0.4 for STR GP 5, - and 0.3 for SER GP 1. LRFD 8 specifies 1.0 factor for all WS regardless…

I came across these issues while trying to export models from OBM to LBC and LBS. 1- When I send a skewed prestressed concrete bridge with the back of abutment as reference line to LBC, the transferred model will end up having flared beams and wrong…

Hello, I am trying to import my live loads into Leap Bridge Concrete from a text file. I am getting an error saying "Error on reading bearing loads!". However, when I import my temperature loads from a text file, I have no issues. The text files for…

I am using Leap Concrete Version 18.02.02.03 for a multi column pier design that includes seismic forces. I need to apply a response modification factor for the columns and the help guide states that this can be modified in the Seismic Parameters. However…

I have two users, one on Windows 7, the other on Windows 10. Both are running the latest LEAP Bridge Concrete (version 19.02.03.33). They can create LCBX files, but get this error when attempting to reopen them: The Windows 10 user tried renaming…

Hello, When attempting to create the load combinations I receive the following message - "Dependent loads of type WL and master loads of type WS are not equal in number. Please specify same number of two loads when cross combinations option is turned…

Hi Please help me to know area of steel required for the design of columns, or Area required/ Area Provided Ratio. To calculate modification factor to reduce development length as per AASHTO LRFD 5.10.8.2.4b—Modification Factors clause. Regards …

Hello, I am designing a multi-column pier substructure for a bridge. The substructure model is connected to the superstructure so I am able to auto-generate the superstructure dead load, Braking load, and Permit Live Loads. However, the button to generate…

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