| | | |
| |
FAQ
What is CIS/2@GT?
Design Computing group in College of Architecture of Georgia Institute of Technology(Georgia Tech) is technical support group in CIS/2 based electronic data interchange in structural steel industry.
CIS/2@GT is an online technical resource hosted by Georgia Tech. |
|
What is CIS/2?
CIS/2 (CIMSteel Integration Standards/Version 2) is a protocol through which seemingly stand-alone programs, such as structural analysis, CAD and detailing systems, can communicate with each other.
By providing a neutral data format, CIS/2 allows data interchange between a wide variety of program types as long as these programs have translators written to interpret the CIS/2 neutral data into the programs native format.
CIS/2 was the outgrowth of ten years effort by Leeds University (UK) and SCI (Steel Construction Institute).
Version 1 was partially funded through grants by the European Union EUREKA Project up through its first release in 1995.
Its testing and refinement led to Version 2, which was released in 1999.
The main changes in Version 2 included covering more conditions encountered in structural steel design and fabrication, and attaining closer consistency with the ISO-STEP exchange models and practices, including adoption of several ISO-STEP Integrated Resource libraries.(Fundamentals of Product Description and Support), Part 42 (Geometric & Topological Representation), Part 43 (Representation Structures) and Part 45 (Materials). Version 2 also addressed the data management issues required of production exchange. |
|
What is LPM (Logical Product Model)?
The CIS/2 data model called the Logical Product Model (LPM). Its initial release in 1999 was LPM/5.
The LPM supports the engineering of low, medium and high rise construction, in domestic, commercial and industrial contexts.
The main structural steelwork and the secondary steelwork (purlins, siderails, cleats and cladding) are covered. Frames can be braced or unbraced. Connections can be considered to be pinned, rigid, or semi-rigid; - the latter two being full or partial strength. The frames are fabricated from manufacturing assemblies, which in turn, are made up of parts and joint systems. The parts can be rolled sections, plates and sheets or castings. Joints can be bolted, welded or pinned.
Although the CIS has been developed primarily to enable the engineering of building frames, it can also be applied to other types of steel frame, such as process plant installations, transmission towers, and (to some degree) offshore structures.
The LPM addresses the exchange of data between applications within the dashed border shown in Figure One. It is meant to support a heterogeneous set of applications over a fairly broad portion of the steel lifecycle. It is organized around three different sub-models: (1) Analysis, (2) Design and (3) Manufacturing (detailing).
These sub-models are also called Views. CIS/2 reflects current practice where development of a steel structure may have to iterate through portions of the three stages more than once. Structural pieces in the Design View are design_parts. In the Analysis View the structural pieces are represented as multiple elements and nodes. The Manufacturing View names its parts located_parts. This naming convention can be helpful in identifying EXPRESS Entities that support the three different views.
The three sub-models of CIS served as the early Conformance Classes. But in practice, applications provided support for models with quite varied boundaries regarding their functionality. In the Version Two revision, the Conformance Classes (CCs) were expanded into a very large set, allowing any combination of Entities supporting varied functionality to be a legal set of Conformance Classes.
In early 2003, the LPM has been updated in response to requests by users and identified as LPM/6. LPM/6 also incorporated changes implemented in new releases of the ISO-STEP Integrated Libraries.
A physical load was added to group multiple analytical loads applied to elements. Data Management Conformance (DMC) classes were simplified; a single globally unique identifier (GUID) was assigned for data management in place of three separately managed integers. Data transaction history was moved to a separate Conformance Class, simplifying basic data management implementation. Cambered beams were added to the design sub-schema. The data associated with drawings, NC files and other reports generated from a project model were elaborated. Improved weld and bolt mechanism descriptions are also added.
Another important part of the new LPM/6 was to incorporate more sophisticated ERP (Enterprise Resource Planning) data into the product model. The new information is important for managing schedules, fabricating, delivery, procurement and erection of a construction steel project. For instance, two new structural hierarchies, sequence and lot, are added for the delivery and erection management purposes. Other additions also include various industrial mark-types that have been commonly used by fabricators during the manufacturing process such as a preliminary mark, a barcode and a mill mark. It is planned that new LPM releases will be undertaken every two years. |
|
Who is participating?
Currently, there are twelve steel software applications that provide CIS/2 interfaces, and three more are preparing to provide translators.
The translator matrix illustrates potential exchanges between those applications. Each system translator is listed as a row in the matrix diagram. The three sub-models supported in CIS/2 are shown in columns. Check marks in the cells of the figure outline each application\'s exchange capabilities.
All applications have only implemented a subset of the design, analysis or manufacturing sub-models. The translator implementations have been incrementally developed, based on the most common Entities being modeled by users.
The Leeds and SCI developers of CIS/2 have tried to anticipate the complex and rare requirements, so that CIS/2 is not a limitation.
Some of the CIS/2 capabilities are not yet supported by any application. |
|
How to use Developer's Forum
Developer's forum is located under 'developer' on CIS/2@GT website.
Accessing 'developer' part of CIS/2@GT website requires you to be a participating developer or a member of CIS/2 developer's workshop. If you want to be one of these, please contact AISC
user ID and password. If you don't have user account and password, you can make one at register page. If you forget your password, you can change password with your id, email address and name at password reset page
Following image shows functions and layout of developer's forum.
 |
|
| |
| | | |
|
