Application Study on Building Information Model ( BIM ) Standardization of Chinese Engineering Breakdown Structure ( EBS ) Coding in Life Cycle Management Processes

.e successful adoption of building information modelling (BIM) technology has led to an ever-increasing need for improving management practices in both construction and operation stages of highway project engineering..emost significant aspect of applying BIM technology is establishing the rationality and concise engineering breakdown structure (EBS) coding. However, China has no uniform EBS coding standard for highways, which limits BIM technology development in different construction projects and at different stages of the same construction project. .e purpose of this study is to propose an EBS standard that embodies a coding system for highways and at the same time meets the requirements of BIM management, project management (PM), and operation management (OM) in life cycle management process. .is paper presents an EBS standard based on three classifications: (1) project-level construction, (2) project-level operation, and (3) network-level operation. A case study is given to illustrate the proposed EBS standard’s coding system. .e new EBS system will have better adaptability in both the design and construction stages. .e proposed EBS coding system has been applied in many projects and is undergoing both improvement and standardization in China. .e presented EBS coding standard provides successful implementation references for the future adoption and use of BIM on PM and OM in highway projects.


Introduction
More and more highway projects apply BIM to improve the effectiveness and production efficiency of life cycle design and management [1,2]. In China, many engineers use BIM to improve highway project management including design, construction, and operation. Its popularity is especially noticeable in its application to long-span bridges [3,4]. BIM extends traditional building design beyond 2D technical drawings and beyond 3D modelling by adding 3D with time as 4D modelling and by adding cost as 5D modelling [5]. erefore, BIM includes more than just 3D geometry. It also covers spatial relationships, geographic information, quantities, and properties of building components [6]. 4D modelling includes project management information in life cycle processes, such as quality, cost, and risk management in the construction stage as well as maintenance management in the operation stage [7,8]. 5D augmented cost management improves the level of life cycle management [9,10]. Manager priorities are less cost and high quality in both the construction and operation stages [11]. At the same time, the implementation of the BIM technique must consider the factors relating to 4D to improve the quality of project management and consider the factors relating to 5D to reduce the cost while ensuring project quality.
Some useful attempts at applying BIM technology to life cycle management can be found in the results of related literature research [12,13]. Typical applications include conceptual design optimization, detailed design optimization, construction quality management, construction scheduling management, risk management, and maintenance interval management [14,15]. Liu et al. [16] used a case study involving a long-span steel-box arch bridge project to demonstrate the effectiveness of the BIM-aided approach in the design and construction stages. Wei et al. [17] proposed a BIM-based method for calculating the auxiliary materials required for housing construction. Donato [18] extracted spatial relationships from a BIM, used them to assemble a topology graph, and then imported them into numerical analysis software to calculate numerical values through a customized tool. In the construction stage, Shalabi and Turkan [19] developed and validated implementing industry foundation classes (IFC) in BIM to link and present alarms reported by facility management (FM) systems. Chong et al. [20] analysed and compared the adoption and use of BIM in infrastructure projects, particularly in constructing major road projects in Australia and People's Republic of China. ey discussed road design and planning simulation, web-based interface for the BIM, integration of BIM with geographic information system (GIS), construction progress tracking and updating the BIM, integration of BIM and laser scanning, and 3D model printing. Kim and Cho [21] proposed a geometric reasoning system that analyses geometric information in building designs, derives construction-specific spatial information, and uses the information to assist in construction planning. Kosandiak and Atkin [22] reported a new code of practice on how to reinforce the links between design, delivery, and operation of infrastructure assets through BIM. Wetzel and abet [23] presented a BIMbased framework to support safe maintenance and repair practices during the FM phase, through safety attribute identification, data processing, and rule-based decisionmaking, as well as a user interface. Kang and Hong [24] proposed software architecture for the effective integration of BIM into a GIS based FM system. Lin and Su [25] proposed a BIM-based facility maintenance management system for maintenance staff in the operation and maintenance phase.
To achieve quality management, risk management, and cost management, each component of a 3D model should be managed effectively with a unique ID in the computer [26][27][28]. Current BIM software is used by individuals, businesses, and government agencies who plan, design, construct, operate, and maintain highway facilities. e significant character of BIM software is that the BIM must carry each model's geometry, relations, and attributes. Each model element's attributes can be selected and ordered automatically and are used for quality management as well as cost control. e effective BIM codes must be defined to avoid confusion in life cycle management.
In USA, Construction Operations Building Information Exchange (COBie) was approved by the USbased National Institute of Building Sciences as part of BIM standard in December 2011. It is closely associated with BIM approaches to design, construct, and manage built assets, and it has been incorporated into related software. COBie documentation together with BIM implementation promotes an opportunity for improved data handover for facilities managers and building owners [29]. Research findings reveal that further development of COBie is required to mitigate software inflexibility and augment automation of semantic data transfer, storage, and analysis. Future work will validate the Application Programming Interface (API) plug in via user experience and integrate additional databases such as post-occupancy evaluations (POE) [14]. In fact, using an engineering breakdown structure (EBS) is an effective approach to operating the BIM in life cycle management processes. Almost all highway construction projects in China have used BIM technology since 2014 to manage the construction and operation processes. BIM technology is applied by government, institutes, design institutes, and consulting companies in different provinces and regions. erefore, no consistent EBS coding standard exists; several BIM management systems are incompatible. When different EBS coding data and information are applied in different projects, they cannot be shared. is is contrary to the original intention of BIM technology application. A complete Chinese EBS coding system applicable to all cities and provinces is urgently needed in China. Researching and creating this complete EBS coding system is the purpose of this study.
To operate the BIM effectively, the most significant work is establishing the rationality and concise EBS coding. Furthermore, in different construction projects and at different stages of the same construction project, it is important to operate the BIM and transfer information in life cycle management processes. erefore, a uniform EBS coding standard used for BIM management, project management, and operation management in life cycle management process of highways is needed urgently. is paper presents a new and complete EBS coding standard system with three classifications: (1) project-level construction, (2) project-level operation, and (3) network-level operation. e application practices of many BIM technology projects of the authors' institute provided a useful reference for the formulation of standards. For different stages and different projects, the encoding structure needs to be adjusted. An overview of the EBS coding standard system is shown in Table 1.
e first EBS coding classification has eight coding districts represented by numbers or letters. It is suitable for BIM management and construction project management in both the design and construction stages. e second EBS coding classification adds maintenance work behind the first EBS coding classification due to its use in the operation stage. e third EBS coding classification adds the naming and numbering of highway network before the second EBS coding classification since it is suitable for network-level work in the operation stage. e basic flowchart for EBS coding of standards is shown in Figure 1. e use of the EBS coding standard in many projects demonstrated an increase in effectiveness and production efficiency due to BIM technology. ose results were further confirmed by many BIM project practices that were based on the new EBS coding standard requirements.

e Structure of the EBS Coding System.
e application of BIM technology goes beyond the planning, design, and construction stages of the project, extending throughout the highway facility life cycle, supporting processes such as cost management [30], construction management [31], PM, and facility operation [32,33]. Several data transfers occur throughout the di erent stages, e.g., from the design stage to the construction stage and from the construction stage to the operation stage. e signi cant data transferred not only include the 3D BIM but also the EBS coding of BIM members. e 3D-BIM member can represent the construction project management media or the operation management media. BIM members must be e ectively managed; therefore, a unique code is assigned to each BIM member. EBS coding plays this vital role in the BIM technology process.
As a signi cant BIM database, EBS can be used to manage the 3-D BIM in both the construction stage and operation stage. Moreover, the project management (PM) and operation management (OM) for highways can be realized by using EBS coding directly. In the construction stage, work breakdown structure (WBS) coding besides being used to describe the work of a project is also used as a basis for estimating and reporting costs, allocating manpower and scheduling tasks [34]. Actually, WBS coding are applied to PM in the construction stage but not applied to OM in the operation stage. In order to achieve life cycle management using BIM technology, the e ective approach for carrying out project management is that EBS coding is mapping WBS coding in the construction stage. EBS extends the life cycle management of facilities including roads, bridges, tunnels, intersection of routes, tra c interchanges, tra c engineering, roadside facilities, environmental conservation areas, and mechanical equipment. e life cycle management not only refers to BIM management but also relates to PM in the construction stage and OM in the operation stage. erefore, the EBS coding standard system was established according to di erent purposes, levels, and stages. e author proposes a new EBS coding standard system for life cycle highway management.
ere are three EBS coding standard classi cations: purpose, level, and stage, as shown in Table 1.

e Basic Structure of EBS Coding Standard.
We de ne the rst classi cation as the basic structure of the EBS coding standard, and the second and third classi cations are expanded from its basic structure. Several factors such as the structural location, left or right side, engineering classication, structural classi cation, structural component, structural part, and structural member are considered in the basic structure of EBS coding standard. e objective of EBS coding is twofold: (1) to create a unique ID for managing the BIM member in the life cycle analysis and (2) to provide object for PM during life cycle management. erefore, the nal EBS coding standard needs to have some signi cant characteristics, such as uniqueness and functional information. e goal was to make it as simple as possible.
ere are eight districts in the basic structure of EBS coding standard which de ne eight districts, beginning with the second district and ending with the ninth district. In each district, speci c meanings are given to each letter or numbers. e second district de nes the structural location through 8 numbers. We recommend the location be denoted by hub stakes, such as bridge and tunnel hub stakes, or main body of the road hub stake. e third district denotes that this EBS coding denoted structure is located on the left or   (1) Structural part (4) Supplement (1) Figure 1: e basic owchart for EBS coding of standards. Top row 2nd-9th districts are labelled according to letter or number. L refers to abbreviation of "letter" (from A to Z). N refers to abbreviation of "number" (from 0 to 9). e description of breakdown of structure components: structural location, left or right side, engineering classi cation, and characteristics pertaining to structures.
right side. L denotes the left side, R denotes the right side, and N denotes the whole structure without reference to either left or right side. e fourth district denotes engineering classification such as main body of road (thoroughfare), surface, bridge, tunnel, intersection of routes, traffic interchange, and traffic engineering. e detailed rule of the fourth district EBS coding is shown in Table 2. e fifth district coding denotes structural classification according to the engineering classification. For example, if the fourth district EBS coding is C which denotes a bridge, we can designate the type of bridge as a beam bridge, cablestayed bridge, suspension bridge, or arch bridge in the fifth district. Due to the EBS coding emphasis on life cycle management, a reasonable account of the decomposition in structural components is required, which can also be defined as key problems in either the construction or operation stage. Typical EBS coding rules pertaining to the main body of the road, surfaces, and bridges are shown in Tables 3-5. ese EBS coding illustrated in Tables 3-5 are based on many current standards such as "Technical Standard of Highway Engineering" [35], "Standards for Technical Condition Evaluation of Highway Bridges" [36], and "Code for Maintenance of Highway Bridge and Culverts" [37]. Such EBS coding structure is convenient for project management in the construction stage and maintenance management in the operation stage. e ninth district of EBS coding refers to supplemental information when it is needed to support external information such as structural location or structural classification and to distinguish duplicate EBS coding. e ninth district code is optional. If no supplemental information is needed, the ninth district should be replaced by the pound sign, "#." From the above introduction, the basic EBS coding for structures is established. is classification of EBS coding is used for PM in the construction stage of the project level.
is type of EBS coding is becoming more popular and successful.

EBS Coding System Standard and Life Cycle Management in BIM.
Life cycle management relates to design, construction, and operation stages. e solutions addressing life cycle management are different in each stage. e design stage focuses on an optimized design plan, the construction stage focuses on quality and risk management, and the operation stage focuses on maintenance and reinforcement management. We need to establish the different EBS coding standard in different stages. At the same time, the EBS coding in different stages should have connections that can show how planned solutions relate to each other. For this purpose, we proposed life cycle EBS coding system as is shown in Table 1. e second and the third classifications of EBS coding standards are based on the basic structure of EBS coding and are introduced as follows. Figure 2 illustrates the application process of EBS coding in life cycle management. Generally, the BIM is built in the design stage or in the construction stage with commercial software. Once a BIM is obtained, many BIM technology applications such as drawing review, engineering quantity accounting, construction simulation, and construction planning can be implemented. Clearly, these applications are based on the 3D model and are not related to BIM project management, so at this point, the EBS coding is not necessary. To apply the collaborative management platform, EBS coding must be correlated with the BIM. Based on EBS coding, the project collaborative management platform is developed. e functions of this platform include quality management, schedule management, risk management, measurement-based payment, personnel management, and equipment supplies management. ese functions are dependent on the EBS coding system, not only in the construction stage but also in the operation stage.
For this purpose, we established a three-classification EBS coding system. e first classification is illustrated above. Because the second classification of EBS coding is used for BIM management and maintenance management in the operation stage, maintenance work is added based on the first classification of EBS coding. We recommend making the following improvements according to the first classification of EBS coding: (1) add standard maintenance work to the tenth district and (2) modify the second district by converting it to an operation hub stake. is modification allows for the differences in the construction hub stake and operation hub stake. e details of the second classification of the EBS coding of a standard structure are shown in Figure 3. Table 1 demonstrates that the third classification of EBS coding is used for network level of highway operation. erefore, we should obtain the third classification of EBS coding based on improving the second classification of EBS coding. Naming and numbering of the highway is added in the third classification of the EBS coding. e details of naming and numbering rules are shown in Table 6. e flowchart of EBS coding for a third classification of EBS structure are shown in Figure 4.

Engineering Background.
Ou River Estuary Bridge is the first large bridge in China with three towers and a four-span suspension bridge. e main span is composed of four spans, 230, 800, 800, and 348 m, the north approach span is the box beam bridge with a length of 3,219 m, and the south approach span is the box beam bridge with a length of 2,603 m.  Both the main body of the roads and surfaces in the seventh and eighth districts are empty due to structural simplicity. In such circumstances, we should use the letter and pound sign "N###" to indicate that the EBS coding is complete. BIM technology is used in its life cycle management. e BIM was built in the design stage, and a project collaborative management platform was applied during construction such as quality management, risk management, and cost management. e maintenance and management system based on BIM will be applied after completion (scheduled for 2021). Figure 5 shows the Ou River Estuary Bridge arrangement of the main span and approach span.

Application Results.
According to the characteristics of Ou River Estuary Bridge, the first classification of EBS coding has been defined along with building BIM modelling at the same time. Typical EBS coding results of the Ou River Estuary main span bridge and details of two members are shown in Figure 6. e first member is a steel beam with EBS coding 0276.020RCCBA023F001#. Each district of this EBS coding has a special meaning. e first 7 digits "0276.020" denote the hub stake of the main span bridge; the third district letter "R" lets us know that this steel beam is located on the right-hand side; the fourth district letter "C" denotes the engineering bridge classification according to Table 2; the fifth district letter "C" denotes the structural classification of the suspension bridge according to Table 5; the sixth district letter "B" denotes a structural component superstructure according to Table 5. e seventh district is a letter-number set "A023" denoting a bearing structure with a number of 023 according to Table 5. e eighth "F001" district denotes a steel beam structural member with a number of 001 according to Table 5. e ninth district "#" denotes there is nothing to supply for this member's EBS coding. e EBS coding of the main span bridge pier is also demonstrated in Figure 6. Likewise, Figure 7 shows the EBS coding of the box girder and pile foundation located on the Ou River Estuary Bridge's southern approach to the span bridge. Each coding has special meanings according to proposed EBS coding standard.
is EBS coding includes more completely information that is conducive to management. e code generation and  Advances in Civil Engineering compilation in the BIM is de ned in the model building process. In order to increase e ciency and accuracy, a simple conversion program is developed to use in Ou River Estuary bridge's BIM management. is conversion program is being improved to accommodate di erent kinds of BIM modelling software. e EBS coding system was established to allow the EBS coding to become a part of the BIM. Based on BIM and EBS coding, the Ou River Estuary bridge project collaborative management platform is developed to achieve many functions such as quality management, schedule management, risk management, measurement-based payment, personnel management, and equipment supplies management. ese functions are dependent on the EBS coding system, not only in the construction stage but also in the operation stage. e application of the Ou River Estuary Bridge when using EBS coding was well received by project management because it achieved good results.  Top row 2nd-10th districts are labelled according to letter or number. L refers to abbreviation of "letter" (from A to Z). N refers to abbreviation of "number" (from 0 to 9). e description of breakdown of structure components: structural location, left or right side, engineering classi cation, and characteristics pertaining to structures.  Naming and numbering of highway (4) Figure 4: e third classi cation of EBS coding of a standard structure. Top row 2nd-10th districts are labelled according to letter or number. L refers to abbreviation of "letter" (from A to Z). N refers to abbreviation of "number" (from 0 to 9). e description of breakdown of structure components: structural location, left or right side, engineering classi cation, and characteristics pertaining to structures.

Conclusions
is study achieved its primary task of providing an EBS standard to use as a way to provide coding for life cycle management. ere are three classifications in the proposed EBS coding system that are needed to establish a BIM: management, PM, and OM. e establishment of this model led to the following conclusions. e first EBS coding classification is suitable for BIM management and PM in the design and construction stages.
is EBS coding classification includes primary information such as structural location, left or right side, engineering classification, structural classification, structural component and structural part, structural member, and supplemental information, which are found in the second to ninth districts.
is is the basic EBS coding for highway structural members. e second EBS coding classification is suitable for BIM management and OM with the project level. is EBS coding classification not only includes all the information of the first classification of EBS coding but adds maintenance works to the tenth district. e third classification of EBS coding is used for BIM management and OM with network level in operation stage. On the basis of second classification of EBS coding, the naming and numbering of highway is added on the first district. e rationality and concise uniform EBS coding standard is established to the benefit for the use of BIM technology on PM and OM in highway projects since significant information was transferred through EBS coding. A case study illustrates that the proposed EBS coding system plays a very significant role in the application of BIM technology. e application of many projects demonstrates that this EBS coding standard system is suitable for BIM management, PM, and OM for both project-level work and network-level work in both the construction and operation stages.
e proposed results of this study provide a useful method and an applicable approach for the use of EBS coding to manage BIM modelling as well as project-level and network-level management in life cycle management. e development and implementation of this EBS coding standard will greatly promote the application and development of BIM technology in China.

Data Availability
e data used to support the findings of this study are included within the article.

Conflicts of Interest
e authors declare that there are no conflicts of interest regarding the publication of this paper.