1、Guide to Use of Industry Foundation Classes in Exchange of Reinforcement Models Reported by ACI Committee 131 ACI 131.2R-17First Printing October 2017 ISBN: 978-1-945487-81-1 Guide to Use of Industry Foundation Classes in Exchange of Reinforcement Models Copyright by the American Concrete Institute,
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14、itect/Engineer to be a part of the contract documents, they shall be restated in mandatory language for incorporation by the Architect/Engineer. ACI 131.2R-17 was adopted and published October 2017. Copyright 2017, American Concrete Institute All rights reserved including rights of reproduction and
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16、om the copyright proprietors. 1 ACI 131.2R-17 Guide to Use of Industry Foundation Classes in Exchange of Reinforcement Models Reported by ACI Committee 131 Christopher D. Brown, Chair Allan P. Bommer, Secretary Mark Douglas Agee Daniel D. Berend Richard H. Birley Daniel Bittrich Brady G. Buckley Bar
17、ry B. Butler Peter J. Carrato Jeffrey N. Cochrane James T. Davy Charles M. Eastman Dennis J. Fontenot Sidney Freedman David A. Grundler Jr. Michael Gustafson Michael G. Hernandez Harrison Rolfe Jennings Julian Kang William M. Klorman Andrew R. Lloyd Ronald L. OKane Andrew Pinneke Joseph C. Sanders W
18、illiam J. Shebetka Carl Taylor John B. Turner Peter Zdgiebloski Special acknowledgement and thanks to D. Yang, Research Scientist at the Digital Building Laboratory in the Georgia Institute of Technology, for his contributions to this guide. This guide provides a protocol for the exchange of data re
19、lated to reinforcing steel between software applications. This guide pres- ents a human-readable list of reinforcing steel entities, attributes, property sets, and relationships, with sufficient specificity so that the format and syntax for machine-readable exchanges based on Industry Foundation Cla
20、sses (IFC) can be employed, enhanced, or developed. This specific set of exchange requirements is referred to as a model view definition (MVD). Material and geometric attri- butes, property sets, and relationships, both required and optional, that address most reinforced concrete applications for bu
21、ildings and nonbuilding structures are presented. This guide is intended to be used by building information modeling (BIM) software developers to assist in the development of consistent and accurate exchanges of reinforcing steel information between applications. Keywords: attribute; building inform
22、ation modeling; model view defini- tion; Industry Foundation Classes; reinforcing steel. CONTENTS CHAPTER 1INTRODUCTION AND SCOPE, p. 2 1.1Introduction, p. 2 1.2Scope, p. 3 CHAPTER 2DEFINITIONS, p. 3 CHAPTER 3REVIEW OF INDUSTRY FOUNDATION CLASSES CONCEPTS, p. 3 3.1Industry Foundation Classes, p. 3 3
23、.2Entities and occurrences, p. 3 3.3Attributes, p. 4 3.4Property sets, p. 4 3.5Relationships, p. 4 3.6Entity diagrams, p. 4 CHAPTER 4COMMON MODELING REQUIREMENTS, p. 5 4.1General, p. 5 4.2IfcRoot attributes, p. 5 4.4IfcProduct, ObjectPlacement, and IfcRelContain- edInSpatialStructure, p. 5 4.5IfcTyp
24、eProduct and IfcProduct, p. 5 CHAPTER 5PROJECT, SITE, AND BUILDING, p. 6 5.1Conceptual modeling, p. 6 5.3IfcSite, p. 7 CHAPTER 6REINFORCEMENT MATERIAL MODELING, p. 8 6.1Conceptual modeling, p. 8 6.2IfcMaterial, p. 8American Concrete Institute Copyrighted Material www.concrete.org 2 GUIDE TO USE OF I
25、NDUSTRY FOUNDATION CLASSES IN EXCHANGE OF REINFORCEMENT MODELS (ACI 131.2R-17) CHAPTER 7REINFORCING BAR MODELING, p. 9 7.1Conceptual modeling, p. 9 7.2IfcReinforcingBarType, p. 10 7.3IfcReinforcingBar, p. 12 CHAPTER 8WELDED-WIRE REINFORCEMENT MODELING, p. 18 8.1Conceptual modeling, p. 18 8.2IfcReinf
26、orcingMeshType, p. 18 8.3IfcReinforcingMesh, p. 19 CHAPTER 9BAR COUPLER MODELING, p. 20 9.1Conceptual modeling, p. 20 9.2IfcMechanicalFastenerType, p. 20 9.3IfcMechanicalFastener, p. 21 CHAPTER 10BAR TERMINATOR MODELING, p. 22 10.1Conceptual modeling, p. 22 10.2IfcDiscreteAccessoryType, p. 22 10.3If
27、cDiscreteAccessory, p. 23 CHAPTER 11ACCESSORY MODELING, p. 24 11.1Conceptual modeling, p. 24 11.2IfcDiscreteAccessoryType, p. 24 11.3IfcDiscreteAccessory, p. 26 CHAPTER 12CALLOUT AND CAGE MODELING, p. 27 12.1Conceptual modeling, p. 27 12.3IfcElementAssembly for cages, p. 29 CHAPTER 13BUNDLE AND RELE
28、ASE MODELING, p. 29 13.1Conceptual modeling, p. 29 13.3IfcGroup for releases, p. 30 CHAPTER 14REFERENCES, p. 31 Authored documents, p. 31 APPENDIX AINDUSTRY FOUNDATION CLASSES INSTANCE DIAGRAMS, p. 32 A.1Standard Industry Foundation Classes instance diagrams, p. 32 A.2Selected diagrams, p. 33 APPEND
29、IX BEXAMPLES, p. 39 B.1Selected example files, p. 39 B.2Example 1Single straight bar, p. 39 B.3Example 2Single straight bar with forged head, p. 42 CHAPTER 1INTRODUCTION AND SCOPE 1.1Introduction This guide provides a model view definition (MVD) that describes both minimum and optional exchange requ
30、ire- ments for concrete reinforcement models through the use of Industry Foundation Classes (IFC). The MVD is intended to be used by software developers to create interoperable applications that will allow reinforcement detailers, rein- forcement fabricators, and others to exchange detailed rein- fo
31、rcement models between all participants in the concrete construction supply chain. The terminology and concepts used in this guide are those of the intended audience: soft- ware developers creating and modifying software applica- tions that produce or consume reinforcement models. The National BIM S
32、tandard-United States (NBIMS-US) (NIBS 2007) defines standard and efficient terminology and semantics to be exchanged in building information models to support various business-use cases throughout architecture, engineering, construction, and operations projects. The project committee responsible fo
33、r developing the NBIMS-US is a committee of the buildingSMART alliance, a council of the National Institute of Building Sciences (NIBS). The NBIMS-US establishes the standard process to develop the NIBS standard. The development process includes four phases: 1. ProgramDefines information exchange re
34、quire- ments that may be standardized by developing process models and defining specifications and business rules for each exchange. An example of an information exchange is the transfer of data in context between various entities along the concrete supply chainfor example, from the architect to the
35、 structural engineer. In this phase, a process model that identifies the required tasks, the information exchanges that take place in the project lifecycle, the actors (those entities such as engineers and reinforcing bar detailers who develop or use information), and the software applications that
36、are the senders and recipients of these exchanges, is developed. The information exchanges are defined by exchange models, which specify the functional requirements (content) of data exchanges to be implemented. When the process models and exchange models are combined, they form an information deliv
37、ery manual (IDM). This IDM serves as the overall func- tional requirements specification for one or more exchanges. 2. DesignDevelops exchange requirement models and qualitative MVD. 3. ConstructDevelops software implementation specifi- cations for MVD and facilitates product testing and certifica-
38、tion of information exchanges. 4. DeployProvides generic and product-specific building information modeling (BIM) guides, validates data exchange, and extends the complexity of information that can be included in the BIM data. ACI 131.1R addressed portions of the first and second of these four phase
39、s, Program and Design, by estab- lishing a flowchart (an IDM) for data exchange across the concrete design and supply chain. This document addresses portions of the second and third of these phases, Design and Construct, for the reinforcing steel portion of concrete data exchanges. Entities, attribu
40、tes, property sets, and relation- ships, both required and optional, are presented that can be used to employ, enhance, and develop data exchange stan- dards. These exchange requirements make up the MVD for reinforcing steel.American Concrete Institute Copyrighted Material www.concrete.orgGUIDE TO U
41、SE OF INDUSTRY FOUNDATION CLASSES IN EXCHANGE OF REINFORCEMENT MODELS (ACI 131.2R-17) 3 This guide is organized as follows. Chapter 3 reviews the IFC concepts upon which the MVD has been developed. Chapter 4 describes modeling concepts that are used for all information exchanged. Chapter 5 describes
42、 the modeling of projects, sites and buildings. Chapters 6, 7, and 8 describe modeling of reinforcement materials, reinforcing bars, and welded-wire reinforcement, respectively. Chapters 9, 10, and 11 describe modeling of bar couplers, bar termi- nators, and other reinforcement accessories, respecti
43、vely. Chapters 12 and 13 describe grouping of bars into callouts, cages, bundles, and releases. Appendix A shows standard IFC instance diagrams for the exchange, and Appendix B provides examples of the MVD in use. 1.2Scope This guide is intended to be used in conjunction with IFC 2x4 (IFC4), Addendu
44、m 1 (buildingSMART International 2015). This guide provides human-readable description of entities, attributes, property sets, and relationships for reinforcing steel used in buildings and nonbuilding struc- tures, that can be used by software developers to prepare machine-readable data exchange pro
45、tocols. Geometry, position, attributes, and other information are provided for reinforcing bars, welded-wire reinforcement, bar couplers, bar terminators, and other items that are commonly included in reinforcement models. In addition, informa- tion related to the bundling of bars for shipment and t
46、he tracking of releases is included. This guide describes the MVD that is used in the exchange of reinforcement information, but does not provide detailed descriptions of IFC syntax and modeling requirements. buildingSMART International (2013) provides that information. A level of development (LOD)
47、specification (BIMForum 2015; American Institute of Architects 2013) is a reference that enables practitioners in the architecture, engineering, and construction industry to specify and articulate, with a high level of clarity, the content and reliability of building information models at various st
48、ages in the design and construction process. Data exchanges described in this guide vary from preliminary modeling of reinforcing steel to fabrication-ready information to drive computer- controlled shop equipment. This range of LODs supported by this exchange is from 300 to 400, described as follow
49、s. a) LOD 300: The model element is graphically repre- sented within the model as a specific system, object, or assembly in terms of quantity, size, shape, location, and orientation. Nongraphic information may also be attached to the model element. b) LOD 350: In addition to the information provided by LOD 300, interfaces with other building systems are provided for the modeled element. c) LOD 400: In addition to the information provided by LOD 350, detailing, fabrication, assembly, and installation information a
