Autodesk 240B1-05A111-1301 - Revit Architecture 2010 Manuale utente

REVIT®STRUCTURE

Coordination between

Revit Structure and

Revit Architecture

Structural engineers who use Revit®Structure

software can better coordinate their work with

architects using Revit®Architecture software. This

paper examines how building information is

shared between Revit Structure and Revit

Architecture users.

Linking Revit Models

Traditional structural processes begin with the architectural drawings, usually CAD-based

drawings. But structural engineers that are using Revit Structure and are working with

architects using Revit Architecture can directly link to the architectural Revit Architecture

file to start their structural design. Sharing the same building information model with

architects enables the structural and the architectural design and documentation to stay

coordinated.

Linking a Revit Architecture file with the Revit Structure model gives structural engineers a

starting point for their design, based on the architect's design intent. Changes made by

the architect can be tracked - facilitating design coordination and change management.

Similarly, architects using Revit Architecture can link a Revit Structure model into their

architectural models and reap the same coordination benefits.

Because both software solutions are using the same underlying building database, the

engineer can view, access, and query all the architectural properties of the model and the

architect can do the same for the structural elements.

Linking Models

Cross-linking the architectural and structural models is the preferred means of sharing the

models between architects and engineers if both are using Revit-based applications, but

are in separate organizations without access to a shared network. They can exchange

and cross-link their respective models, much like an architectural DWG file might be x-

referenced into a structural DWG file, but with far more intelligence.

Even when the engineers and architects are within the same A/E firm, linked files may still

be the preferred way of working - because they develop their respective designs at a

different pace and prefer the flexibility of keeping their own RVT files.

CONTENTS

Linking

Revit Models.............1

Sharing the Same

Revit Model...............8

Coordination

Monitor....................10

Interference

Checking.................12

Revit Structure and Revit Architecture

www.autodesk.com/revitstructure 2

Model Linking Example

To understand how the Revit models are shared, let's step through an example.

The engineer opens a new project in Revit Structure, then establishes commonly used

views; users are encouraged to set up and save project templates with specific views and

parameters. Once all the settings have been saved (File >> Save As >> Project

Templates), users can browse through the available templates at the start of a new project

and choose the one which is appropriate for the job.

In the case of a linked architectural file, the existing structural levels (if any) should be

deleted since they can directly be copied from the architectural model. If a default project

template with is used, the engineer manually deletes levels from the elevation view.

The architectural model is then imported (File >> Import/Link), and the engineer identifies

the architect's RVT building model file.

Using the Architectural Model to Begin the Structural Design

Once the architectural model is imported, each architectural view is properly displayed in

the corresponding structural views (2D and 3D). In the building elevation view, the linked

file shows all the architectural levels.

Figure 1:

Cross-linking architectural

and structural models is

the common method of

sharing design models.

Figure 2:

Importing a Revit

Architecture file into a

Revit Structure model

enables structural

engineers to begin their

design based on the

architectural intent.

Revit Structure and Revit Architecture

www.autodesk.com/revitstructure 3

The engineer can visualize the architectural model in 3D (View >> New >> Default 3D

view). The engineer's main interests are: the building levels; grids lines to layout the

columns and structural framing; and the position of architectural columns (used to place

structural columns).

Levels, Grids, and Columns

Efficient tools have been implemented in Revit Structure allowing the engineers to copy

the architectural levels, grids, and columns from the linked file and turn them into

structural elements.

To copy the architectural levels, the structural user displays the building elevation view,

selects Tools >> Copy/Monitor >> Select Link, and graphically selects the linked file.

Figure 3:

The engineer is able to

visualize the architectural

model in 2D and 3D.

Figure 4:

Engineers can copy

architectural grids, levels,

and columns from the

linked file.

Revit Structure and Revit Architecture

www.autodesk.com/revitstructure 4

Additionally, the Options button lets the user offset the levels during this process to

account for thickness of the floor finishes that are not needed on structural levels.

It’s important to notice that the floor plans in Revit Structure are showing the elements

going down. Architects (and Revit Architecture) depict elements going up. For instance, a

column created in Level 2 in Revit Architecture would show an architectural column going

from Level 2 up to Level 3, whereas in a structural plan, the structural column defined in

Level 2 would go from Level 2 down to Level 1.

Hence the Foundation level created by an architect may not show anything in the

structural plan.

Figure 5:

Revit Structure allows

users to automatically

offset copied levels.

Revit Structure and Revit Architecture

www.autodesk.com/revitstructure 5

The Copy tool from the design bar, allow users to transform the levels in the architectural

linked file into structural levels for the structural floors. The engineer checks Multiple to

select several instances, uses a window selection from left to right to grab the levels to

copy from the architectural model, then clicks on Finish. Now all the architectural levels

are duplicated and "live" in the structural model.

The next step is to create structural floor plans with grids that matches the architectural

floor plans grid. The engineer selects View >> New >> Floor plan, reviews the existing

level names, selects the desired levels (or typically just selects all the levels) and clicks

OK.

Figure 6:

Revit Structure depicts

columns going from

higher levels to lower

levels.

Figure 7:

The Copy tool allows

users to transform

architectural levels to

structural levels.

Revit Structure and Revit Architecture

www.autodesk.com/revitstructure 6

Browsing each floor plan, the user now sees the corresponding linked architectural floor.

Levels (such as "structural floor") can be renamed in the project browser and displayed -

ordered by ascending or descending level height.

The engineer uses the Copy command again to copy the grids from the architectural floor

plans. The same process is used to generate structural columns based on architectural

columns, level by level. Engineers may adjust splice lengths of columns, or possibly split

the columns (if the architect created only one column from the bottom to the top of the

building).

Once levels, grids, and columns are in place, the engineer can turn off the visibility of

some architectural objects or of the entire linked file.

Figure 9:

Users can specify the

visibility of architectural

objects in the linked file.

Figure 8:

Structural floor plans can

be created from the

architectural floor plans.

Revit Structure and Revit Architecture

www.autodesk.com/revitstructure 7

He continues defining the structural system, the framing layout, and so forth. Note: The

engineer will typically offset the slabs and beams - as the levels created by the architect

may be at the top of the floor and not at the top of the steel or the top of the slab.

Usually engineers model these additional structural elements (beams, braces, slabs…)

from scratch. If other structural elements are already in the linked file from the architect,

they just recreate their own elements over the architect's elements.

Coordination of Architectural Files

At this point on, the linked architectural file remains in the structural model for coordination

purposes. The engineer reloads new versions of the architectural model as needed - to

better coordinate change orders coming from the architect and to more accurately adjust

the structural design.

If the architect has defined structural components in the initial linked file (either because

they are part of the architectural visual design, or as a starting point to calculate clearance

between the structural beams and the ceilings for example) the engineer will probably not

use them and will create a new structural system by creating new elements on top of the

architectural linked model.

This work process is quite common and completely reasonable - since the engineer is

responsible for the structural design and the architect is not!

The engineer can leave the structural elements that the architect might have built

previously - controlling the visibility of these elements using the visibility graphics of the

views - and continue work on his new structural elements.

Similarly all the structural objects that the architect originally put in his design are

preserved intact in the architectural file. The architect does not need to update them

manually according to engineer’s final design. While he links the Revit Structure file to his

model, he can just turn off the visibility of the original structure (or select and delete

members) and turn on the ones the engineer has designed each time he needs to use

them in various architectural views or details.

Figure 10:

Revit Structure users can

reload linked architectural

files as needed.

Revit Structure and Revit Architecture

www.autodesk.com/revitstructure 8

Sharing the Same Revit Model

In some situations, structural engineering firms using Revit Structure may want to share

the same RVT file with architects using Revit Architecture software (versus cross-linking

RVT files). For instance, if the architect and the structural engineer are in the same

organization (such as an A/E firm) and both have access to the same network, they can

work directly on a combined architectural and structural model.

Each team uses their appropriate software applications: the engineering team works on

the building information model in Revit Structure while the architectural team works on the

same model in Revit Architecture. Users can simultaneously work on different portions of

a single building information model at the same time via Revit Worksharing (visit the White

Papers Section on Autodesk's website at www.autodesk.com/revit to learn more about

Multi-user Collaboration with Revit Worksharing).

Worksharing

Revit Worksharing allows both the architectural and the structural teams to share a single

building information model by using worksets - which are logical groupings of objects in a

building project that is reserved for editing by a single user at a time. Worksets function

like the External Reference (xref) capability in AutoCAD®software, but with the additional

ability to propagate and coordinate changes between designers.

Worksets usually correspond to specific zones of responsibility, such as: building

disciplines (structural, architectural, etc.); building systems (shell, core, interior, etc.);

physical features (levels, wings, etc.); or model representation (physical or analytical).

For example, the structural engineers and structural drafters may use two separate

structural worksets: a drafting workset with the physical model for structural

documentation, details, and views; and an engineering workset with the analytical

representation of the structure for export to third-party analysis software.

Figure 11:

The worksets tool allows

one user to own structural

elements while other

users can borrow them at

the same time.

Revit Structure and Revit Architecture

www.autodesk.com/revitstructure 9

Similarly, the architectural team works on their own collection of architectural worksets.

The project model is shared dynamically between users - each user contributing their own

skill set when appropriate. Team members adding elements to worksets do not work in a

vacuum: they can see the latest changes from other team members and be sure the

project design is progressing in a well-coordinated manner.

Team members can save their work to local files on their own hard drives and publish

work to the other team members whenever they choose. Other team members then reload

the files to see any changes.

By using worksets in a single shared file, the engineer still maintain "ownership" of

whatever structural elements the architect might originally have created as well as any

new structure. It’s his job to define and modify the entire structural design according to his

engineering judgment.

The architect can still view the structural elements of the engineer’s workset and use them

with the “element-borrowing” capability. Element borrowing lets multiple users dynamically

access (and edit, based on user permissions) shared portions of a project model, but

eliminates the possibility of editing conflict. Element borrowing happens automatically

unless other users have those worksets or elements editable. For example, the architect

would have to request from the engineer to borrow the girders; he cannot use the

structural beams until he has been granted permission by the engineer to borrow them

and has reloaded the engineer’s latest changes to them.

With a single shared model, Revit technology improves multi-discipline coordination while

preserving responsibilities; structural elements remain the engineer’s responsibility and

the architectural elements remain the architect’s responsibility.

Figure 12:

Users are granted

permission by workset

owners to borrow and

modify model elements.

Revit Structure and Revit Architecture

www.autodesk.com/revitstructure 10

Coordination Between Engineers and

Architects

Since Revit Architecture and Revit Structure are based on the same platform, they include

"monitoring" tools to ensure that model changes are coordinated. If the architect (using

Revit Architecture) makes changes in the model to the grids, levels or columns, those

changes are reflected in Revit Structure and the engineer (using Revit Structure) gets

electronic notifications about the architect's modifications. He then has the ability to reject,

approve, or postpone those changes - depending upon the impact that they might have on

the structural integrity of the design. This Coordination Monitor tool is also available to

architects using Revit Architecture in order to check the changes made by the engineers

using Revit Structure.

Coordination Monitor Example

For example, a user first activates the Coordination Monitor by selecting Tools

>>Copy/Monitor >> Select Link, and then clicking on the linked file in the graphical view.

He chooses Copy in the design bar, clicks on Multiple, then select the grids and

architectural columns that he wants to track in his structural model.

When he clicks Finish, an eye symbol next to an element indicates that Revit Structure is

monitoring that element from the architectural linked file.

Figure 13:

An "eye" symbol identifies

elements being tracked

by the Revit Coordination

Monitor.

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