Bentley Mx Road V8i User Manual

How to Use Bentley MXROAD V8i for Road Design

Bentley MXROAD V8i is a powerful software for road and highway design that uses string-based modeling technology to create 3D surfaces. It allows you to quickly create design alternatives, apply superelevation standards, perform cut/fill calculations, design junctions and pavement layers, and automate the production of final drawings. In this article, we will show you how to use Bentley MXROAD V8i for some basic road design tasks.

Creating a Digital Terrain Model (DTM)

A DTM is a representation of the existing ground surface that can be used as a base for the road design. To create a DTM in Bentley MXROAD V8i, you need to import survey data or use existing CAD data. You can also edit the DTM by adding or deleting points, breaklines, or boundaries. To create a DTM, follow these steps:

From the MX menu, select Modeler > DTM > Create.

In the Create DTM dialog box, enter a name for the DTM and select a model type.

Click Add to add data sources to the DTM. You can select from various types of data sources, such as points, strings, meshes, or grids.

Click Create to generate the DTM.

Creating an Alignment

An alignment is a 3D curve that defines the horizontal and vertical geometry of the road centerline. To create an alignment in Bentley MXROAD V8i, you need to use the dynamic placement and editing tools that allow you to modify the alignment parameters on the fly. You can also use input files to define the alignment geometry using commands. To create an alignment, follow these steps:

From the MX menu, select Modeler > Alignment > Create.

In the Create Alignment dialog box, enter a name for the alignment and select a model type.

Select a starting point for the alignment on the screen or enter coordinates.

Select a placement method for the alignment elements, such as tangent, curve, spiral, or transition.

Enter the parameters for each alignment element, such as radius, length, angle, or grade.

Click Create to generate the alignment.

Creating a Carriageway and Earthworks Design

A carriageway is a 3D surface that defines the shape and width of the road pavement. An earthworks design is a 3D surface that defines the cut and fill areas between the existing ground and the road design. To create a carriageway and earthworks design in Bentley MXROAD V8i, you need to use strings to define the cross-sectional features of the road, such as lanes, shoulders, verges, or ditches. You can also use input files to define the cross-sectional geometry using commands. To create a carriageway and earthworks design, follow these steps:

From the MX menu, select Modeler > Cross Section.

In the Cross Section dialog box, select Create Strings.

In the Create Strings dialog box, enter a name for the string set and select a model type.

Select an alignment to attach the strings to.

Select a placement method for the strings, such as offset from centerline, offset from string, or slope from string.

Enter the parameters for each string, such as width, height, slope, or level.

Click Create to generate the strings.

In the Cross Section dialog box, select Create Surfaces.

In the Create Surfaces dialog box, enter a name for the surface set and select a model type.

Select an alignment to attach the surfaces to.

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