2013 Road Design with AutoCAD Civil 3D Autodesk

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Road Design Using AutoCAD Civil 3D,Introduction, AutoCAD Civil 3D engineering software provides civil. engineering professionals with targeted solutions for a wide. variety of infrastructure projects including land development. transportation and water projects, This document is an overview of workflows using AutoCAD Civil. 3D for basic road design These workflows are straightforward in. the creation of dynamic models and built based on applicable. industry recognized or user defined standards Figure 1 A Civil 3D road corridor model. The overview begins with fundamentals and the general workflow for building road models Then the behaviors and. functionality of the overall road model and its individual components are described Finally an example is shown. About Road Design in Civil 3D,The General Workflow. Create base map Road design typically begins by creating an existing conditions surface and compiling a. base map of existing conditions information about the topography parcels utilities and other potential. impacts to the route design, Design alignment An alignment defines the main horizontal route that typically represents the construction. baseline of the roadway Alignments may be created using field collected survey information or from existing. CAD entities such as lines arcs or polylines Optionally they may be created using the wide variety of. alignment layout tools, Apply design criteria Determine the design intent and the constraints that are to be placed on the.
alignment This includes speed and superelevation parameters Design criteria may be assigned at the. onset of the alignment layout or at any time during the design process Warning alerts will aid in the swift. design of a conforming alignment, Generate existing ground profile and design grades Display existing ground surface data for the design. alignment and create the finished grades Finished grade profiles may be created graphically using profile. creation tools or generated from a best fit analysis of existing entities or from information from an external. Construct assemblies Assemblies define the cross sectional component of the design and are built by. connecting individual subassembly objects thereby helping to simulate the geometry and material makeup. of the road as well as helping to define how it interacts with surrounding features along the route The. subassemblies are selected from the prebuilt libraries contained in the Civil 3D Tool Palette Custom. subassemblies can also be created using the Subassembly Composer. Build the corridor Corridors are the resulting dynamic 3D model representation built from the combination. of horizontal vertical and cross sectional design elements. Analyze resulting model Corridors may be used to calculate earthworks and quantity takeoffs to perform. sight and visual analysis to generate surfaces and to extract information for construction purposes. Road Design Using AutoCAD Civil 3D, Individual corridor sections may be examined and edited to help accommodate unique or localized design. conditions, Optimize design To achieve a better design it may be necessary to adjust one or more of the corridor. components For example you can adjust the design profile to better balance cut and fill volumes Edits may. be done using a variety of methods such as grips via tabular inputs and with object specific editing. commands In addition since the road design is dynamic changes made to one component affect the entire. roadway model,About Civil 3D Corridors, Corridors combine surface alignment profile and assembly information to create dynamic three dimensional. representations of route type features such as roads railroads channels and bridges. Corridors are the main design object of road modeling and simulation in Civil 3D They rely on interaction with other. model objects and they help to simulate behavior prescribed by assignable and customizable parameters such as. daylighting lane widening and superelevation schemes. A corridor is created by applying an assembly along the horizontal and vertical path defined by the combined. information of the alignment and profile To complete the corridor targets are specified to achieve daylighting. The type of corridor such as a trench a channel a path a road or a bridge is determined by the assembly. configuration that is applied along the baseline at desired intervals The assemblies that are used to create the. corridor may contain sophisticated behavior such as conditional targeting widening and superelevation. The result is a 3D model that extrudes the specified assemblies along the desired path Feature lines connect similar. points from assembly to assembly These feature lines establish the longitudinal edges of the 3D model Individual. points in the assembly may also be assigned behavior that automatically follows prescribed targets such as curb. return alignments or lane widening feature lines, The resulting corridor model may be used to generate cross section sheets earthwork and material volumes feature.
lines and surfaces Surfaces derived from the corridor can represent finished grades subgrades or any number of. underlying component surfaces These surfaces may be used for visualization material quantity and construction. Components of the Corridor Object, The corridor object is built using baselines assemblies regions parameters and optional surfaces Figure 2 shows a. portion of a corridor and the components used to create it. Figure 2 A baseline is defined by,the alignment and profile that 3. control the horizontal and vertical,aspects of the road An assembly. is then inserted to follow this path,Road Design Using AutoCAD Civil 3D. The corridor components are, Baseline A baseline defines the horizontal and vertical route It is derived from combining the alignment.
and the design profile, Assembly An assembly represents the cross sectional design of the road Assemblies are collections of. interlocking subassemblies which may contain dynamic design parameters such as conditional daylighting. or lane widening, Regions Individual portions of corridors enable application of different design parameters Transitions from. one region to the adjoining region automatically occur Regions are defined by starting and ending station. Corridor parameters Corridor parameters are required to build a corridor object These are assigned in. the Corridor Properties panorama The parameters are region starting and ending stations assembly name. frequency of assembly attachments along the region station range and identifying any necessary targets to. satisfy subassembly behavior, Corridor targets By using the subassemblies parameters the corridor has the ability to target surfaces. alignments profiles feature lines polylines and survey figures Through this interaction corridors can be. designed to automatically tie embankments to a surface widen a lane along an alignment match a ditch. invert to a profile and accommodate many other design scenarios A corridor may be modeled without a. surface however daylighting is required to perform certain road model analysis such as earthwork. calculations Generally speaking targets are used when the geometry of the corridor needs to change as. the design progresses along the baseline,About Rule Based Design. Using AutoCAD Civil 3D you can compare the design of road. elements against recognized industry standards or user. defined standards As designers work to lay out designs the. software provides graphic alerts and or notification tips to help. alert you when standards are not met, This capability helps provide many benefits including greater.
time savings reduced rework due to fewer review comments. more consistency and above all sound engineering design. This is made possible using design criteria and design check. Design criteria may be assigned to the horizontal geometry of. the centerline for example helping to meet the minimum. radius criteria for horizontal alignments based on design. Design criteria can also be assigned to profiles The criteria. considers minimum K values based on required stopping. Figure 3 Design criteria and design check sets are options of. passing and headlight sight distance derived from design Alignment and Profile Properties. Road Design Using AutoCAD Civil 3D, Design checks are another way to control road design as the geometry is being laid out For example design checks. can be established that limit the minimum length of alignment tangents. Rule Violation Warnings, Warnings appear in several locations to help give the designer notification when a violation to the applied criteria or. design checks occurs Alert symbols are displayed at locations along the alignment or profile where the violations. occur Hovering over the symbol displays the tool tip which gives a brief summary of the violation The display of the. warning symbol is controlled by the alignment style. Warning symbols will also display in the entity grid view to help notify the designer of any issues The designer can. choose to correct the issues or ignore them if the design requirements permit When the issues are resolved the. warning symbols will disappear, A design criteria report can be generated helping to identify whether each subentity within a given station range. violates or meets the appropriate design criteria and design checks The reporting utility is accessed in the Toolbox. tab of the Toolspace,Figure 4 Violations of design. criteria and design checks,appear in several places to.
warn users,Design Criteria Files, AASHTO based design criteria files are included with. AutoCAD Civil 3D software These files can be used, as is or copied and modified to better suit specific. design needs The application of design criteria is an. optional property of the alignment and profile objects. as shown in Figure 3 The Design Criteria Editor is used. to create custom criteria files as shown in Figure 5. The default folder location for design criteria files is. ProgramData Autodesk C3D 2013 enu Data Corridor,Design Standards. Figure 5 Editing design criteria in the Design Criteria Editor. Road Design Using AutoCAD Civil 3D,About Design Checks. Design checks are another way to help track and control the road design in real time and can be used by themselves. or in conjunction with design criteria files Design checks use mathematical expressions to compare a geometric. property of an alignment or profile with a predetermined value. For example roadway design may require that tangent road segments be longer than a specified length or that curve. radii exceed a minimal radius, Design checks are managed through the Settings tab of the Toolspace and can be arranged into design check sets.
Figure 6 Design check rules are easy to modify and create They are accessed in the. Alignment or Profile collection of the Settings tab in the Toolspace. Alignments, Alignments define the horizontal routes for features such as channel ways utility trenches roads and bridges Their. geometry is represented by straight line tangents and a variety of curve and spiral types. When individual,geometry is connected,to create an. alignment rule based,design constraints,may be applied. Alignment Creation,and Editing,Alignments may be,created in a variety of. ways They may be,created from existing,line arc and polyline.
entities or they may,be created using the, Figure 7 The Alignment Creation menu and the Alignment Layout toolbar. Alignment Layout,tools as shown in,Road Design Using AutoCAD Civil 3D. Figure 7 Alignments are edited using grip edits or alignment editing commands Editing may also be done in tables. using the alignment grid view as shown in Figure 8. Figure 8 Alignments may,be edited using graphical,methods or by changing. values in the Alignment,entity panorama,Applying Design Criteria to Alignments. Design criteria can be applied at the onset of the alignment creation or added later by using the Design Criteria tab of. the Alignment Properties panel When criteria and design checks are assigned at the onset the designer can have. the advantage of real time warnings when violations occur. Additional design speeds can be added as required in the Design Criteria tab of the Alignment Properties panel as. shown in Figure 9, The use of a Design Check Set is also toggled on in the Design Criteria tab of the Alignment Properties panel.
Tangency between alignment entities can also be checked via Design Criteria settings. Figure 9 Adding design speeds to the alignment criteria. Road Design Using AutoCAD Civil 3D,For real time warnings during the layout of the. alignment the Use criteria based design and,Use design check set options are selected at. the onset of alignment creation as shown in,About Superelevation. Superelevation is the banking of a curve to help,counterbalance the centrifugal forces that a. vehicle experiences while traveling through a,When superelevation parameters are applied to.
the alignment object the resulting corridor,model will rotate and warp the cross sectional. links and shapes to reflect the raising of one,edge of the travel way above the other. The corridor relies on the behavior of Figure 10 Applying. subassemblies to adjust their final shape and design criteria and design. checks at the onset of the, position accordingly Many out of the box Civil alignment creation. AUTOCAD CIVIL 3D 2013 Road Design with AutoCAD Road Design Using AutoCAD Civil 3D 2 Introduction AutoCAD Civil 3D engineering software provides civil engineering professionals with targeted solutions for a wide variety of infrastructure projects including land development transportation and water projects This document is an overview of workflows using AutoCAD Civil 3D for basic

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