© 2009 Bentley Systems, Incorporated Chuck Lawson GEOPAK Product Engineer Abutment Design with...

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Chuck LawsonGEOPAK Product Engineer

Abutment Design with Roadway Designer

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Abutment Design

Designing a bridge abutment in Roadway Designer takes advantage of the Corridor concept. With the ultimate flexibility of Components and Templates, the Designer can easily conform to any required bridge structure specification.

There are many techniques in Roadway Designer that can be used to model bridge abutments. This presentation will cover the workflow used to model a skewed bridge abutment. This method will ultimately work for most bridge abutment types.

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Project Review

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Before we begin, let’s review our project data and the templates that we’ll be using.

Plan View Layout

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Project Review

Earth Only Slopes at Beginning of Transitions

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Project Review

Transition Slope Fill To Structure

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Project Review

Structure Slope

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Project Review Demo

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Creating the Abutment Alignment

The first step in the process is to create a horizontal alignment for the abutment corridor to follow.

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Creating the Abutment Alignment Demo

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Creating the Surface

In order to generate a profile for our abutment corridor, we must first generate a surface along our main roadway corridor (US 301). This proposed DTM surface, should ignore the bridge structure completely.

This surface will allow the Designer to extract a profile along the abutment alignment stored in the previous step.

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Creating the Surface Demo

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Creating the Proposed Profile

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• The proposed profile can be created through extracting the vertical information from the proposed US 301 surface.

• Offsetting the proposed extracted profile by a distance of -0.01’ will allow us to use Target Aliasing and Clipping to generate a very clean cut along the bridge abutment alignment.

• Once the profile is created, the alignment and profile need to be imported within Corridor Modeler so they are available inside of Roadway Designer.

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Creating the Proposed Profile Demo

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Creating the Proposed Corridor

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• The abutment corridor can now be created using the proposed alignment and profile generated in the previous steps.

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Creating the Proposed Corridor Demo

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Bridge Omission from Mainline Corridor

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• The bridge template can now be inserted into the mainline corridor.

• Assuming the bridge is to be modeled separately, the Designer may use a “blank” template for the bridge.

• If the User wishes to model the bridge within Roadway Designer, then replace the blank template with the actual bridge template. A separate bridge corridor may be the more desirable approach.

• The best approach for modeling the bridge is to use a Bentley Product dedicated for bridge modeling such as LEAP for example.

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Bridge Omission from Mainline Demo

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Abutment Template Design

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• Templates through an abutment may have many requirements based on the bridge design. In this example, 3 templates are used

– Template 1 2:1 Earth slopes only

– Template 2 Combination 2:1 earth slopes with

upper concrete structure

– Template 3 All concrete structure

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Abutment Template Design Demo

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Template Drops

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• Template drop locations, transitions, and intervals are key to the success of modeling a bridge abutment

– Use recommended 2’ intervals everywhere except

the filet radii

– Use recommended 0.2’ intervals in the filets

– Use template transitions to change from earth slopes

to concrete slopes

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Target Aliasing Other Surfaces

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• Target Aliasing can be used to target surfaces other than the existing ground surface. The target priorities may be set to choose which surface would have the highest priority.

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Point Controls – Connecting Corridors

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• Point controls can be used to connect points from one corridor to another. This is extremely powerful in enabling a user to focus on one corridor at a time.

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Building the Combined DTM

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• Target Aliasing allows the user to take advantage of clipping options when building combined DTM surfaces. The user may choose to clip only the end conditions, or to clip all intersecting components. Clipping the surfaces “on the fly” produces a combined accurate 3D model. This is a very powerful feature of Roadway Designer.

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Chuck LawsonGEOPAK Product Engineer

Abutment Design with Roadway Designer

© 2009 Bentley Systems, Incorporated Chuck Lawson GEOPAK Product Engineer Abutment Design with...

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