Determination Of A Classification Tool For Ifc Data Models-Books Pdf

Determination of a classification tool for IFC data models
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CCC 2018 Proceedings DOI 10 3311 CCC2018 047, standard includes definitions that cover data required for buildings over their life cycle The first release of IFC came. out in 1997 as IFC 1 0 and was then updated through the years with the second addendum of IFC4 released in July. 2016 2 Open BIM models are generally based on the ISO generic IFC Industry Foundation Classes data model . Since IFC4 it is covered under ISO 16739 2013 It will soon be replaced by ISO PRF 16739 1 currently under. development which in addition to using the EXPRESS data specification language a compact and well suited data. definition language that includes data validation rules within the data specification it will include the XML Schema. definition language XSD This format enables interoperability with XML tools and it is suitable for exchanging. partial building models however it is not very much used in practice because it creates large files for building models . In addition the release of the new ISO will extend the scope to include data definitions for infrastructure assets over. their life cycle as well 3 , 1 1 Classification system. The eBKP H Baukostenplan Hochbau German for cost plan for building construction SN 506 511 4 is a Swiss. standard for classification of building elements It came into effect in May 2009 Based on the experience made in the. first years of utilization this cost plan was updated in 2012 Since then it is commonly used in the Swiss construction. industry To put it in an international context the eBKP H is equivalent to the Construction Specifications Institute. CSI and Construction Specifications Canada s CSC UniFormat mostly used in North America to present cost. estimates during the schematic design phase 5 but it addresses specific needs of the Swiss industry . The Swiss Research Centre for Rationalization in Building and Civil Engineering CRB developed this standard. based on the market needs and with the idea to elaborate a code based on the entire lifecycle of a project as described. in the Swiss regulation SIA 112 Service Model 6 issued by the Swiss Society of Engineers and Architects SIA by. its initials in German The eBKP H aims to cope with the ever growing pressure of the construction industry. concerning costs and requirements in increasingly complex projects The classification of this standard allows. construction companies and design firms to improve the quality of their cost estimates getting them closer to actual. construction costs In addition the precise definition of normalized terms costs and quantity units increases the. transparency and the efficiency in the costs estimation . According to 4 the eBKP H has the following key functions . it can be used for classification of different building types. it is a frequent basis for designers contractors and planners to present costs in a uniform manner. it is independent of the function size complexity structure and construction of a building but also from the. project phase, it can be used for new constructions but also renovations or modification of existing buildings . Although it can be used in later phases of a project detailed design tender and construction the eBKP H is. typically used during the conceptual phases For later phases the NPK Normenpositionkatalog 7 German for. catalog of standard position is preferred because it provides information that is more detailed equivalent to the CSI. and CSC s MasterFormat , The eBKP H is broken down into 14 groups from Land to Value added tax Table 1 and it consists of the following. levels , Main Group The main group contains different groups of elements They are mainly used in strategic planning .
Group of Elements This level gathers different isolated elements together and is generally used in the preliminary. study phase of a project It can also be used in the previous phases if a differentiated elaboration is required . Element The elements are defined according to their physical and functional characteristics This level is mainly. used in the project study phase but can also be used in the earlier phases . Sub element The fourth level is only used in the group of elements H4 hospital installation where a more. detailed level is needed , 355, CCC 2018 Proceedings DOI 10 3311 CCC2018 047. Table 1 Main groups included in the eBKP H 4 , Main Groups. A Land H User specific installations, B Preparation work I Building surrounding areas. C Structural work J Furnishing Equipment Decorations. D Technical work V Planning cost, E Outside walls Cladding W Additional implementation cost. F Roofing Y Provisions, G Interior finishing Z Value Added Tax.
The eBKP H can also be used with a different degree of exactitude depending on the requirements of the SIA during. the different phases of a project It is organized as a hierarchy with up to four different levels There are costs and. normed references which are assigned to every level Each level allows assessing standard value for costs. establishment control and management at different stages of a project according to the SIA 112 phases 6 The grade. of detail increases with the level of the classification from the main group to the sub element According to the. required accuracy of a cost estimate a different level of the eBKP H classification should be used Table 2 shows an. example of the decomposition of group C Structural Work into its group elements and elements . Table 2 Example of classification for structural work main group and corresponding group elements and elements 4 . Main Group Group of Elements Elements, C1 1 Pipes and underground utilities. C1 2 Sealing and isolation, C1 Foundation C1 3 Continuous footing. C1 4 Floor slab nonbearing , C1 5 Floor slab bearing . C Structural work, C2 1 Wall exterior , C2 Bearing wall. C2 2 Wall interior , C3 1 Colums exterior , C3 Column.
C3 2 Colums interior , C4 1 Slab, C4 2 Stairs Ramp. C4 Floor roof, C4 3 Balcony, C4 4 Roofing, C5 1 . C5 Other, C5 2 , Every level has a specific code standard It begins with the Main Group defined by a letter then the Groups of. Elements Elements and Sub elements are named with numbers and separated by dots there is no separation between. the Main group s letter and the first number For example H4 3 2 Equipment for surgery belongs to the sub element. level or C2 2 Walls Inside to the element level , The use of rules applied to IFC data has been investigated e g applications to construction safety 8 Current. open BIM models only allow limited interpretations and evaluations concerning specific guidelines or standards The. goal of this work is to create a classification tool for IFC data model that will identify and classify building elements. according to specific cost structure For this study the cost structure used was the one from Switzerland the eBKP H. classification Baukostenplan Hochbau German for cost plan for building construction 4 Although there is a lot. of work done regarding the estimate during the early phases of the quantities required for construction projects 9 . 10 the extensive use of BIM allows quantifying the materials required quickly and reliably to develop cost estimates. from an IFC file To be able to create an accurate cost estimate the different elements have to be properly classified . To create a reliable classification tool the work will begin with a good understanding of the IFC data model and the. eBKP H classification This will allow to see what are the possibilities with an IFC data model and then classify the. elements correctly according to the chosen classification The creation of the tool itself will be made on the software. 356, CCC 2018 Proceedings DOI 10 3311 CCC2018 047.
Solibri Model Checker 11 which is mainly a model checking software but it also has a good classification capacity . This tool will also be based on some Excel tables . To verify the usability of the model before classifying it and at the end of the process to ensure the accuracy of the. classification quality assurance tests will be done . 2 Classification process, The proposed classification process is divided into four different parts Figure 1 Each of these parts i e processes . consist of the sub processes described in the following paragraphs . Figure 1 General classification process, 2 1 Check data. The first step is to check the quality and accuracy of the IFC data model Figure 2 shows the process for data. verification Once the format of the data is known it is necessary to choose an appropriate software that will allow the. reading and checking of data effectively The checking rules must then be defined It is essential that those rules are as. accurate as possible to avoid unforeseen problems Some points that can be verified are for example the consistency. in the naming of the objects and the completeness of the model It is also important to do a clash detection to be sure. that there are no duplicated objects and objects overlapping with each other which would lead to an overestimation of. the quantities It is useful at the end of the quality check to manually verify it through some random and independent. checks If the data model is considered good this process is over Otherwise the model should be sent back to the. person who created it with a list of issues to be addressed before the model can be used . Figure 2 Sub process for Check data, 2 2 Classify data. Once the data is checked and it is verified that the model is usable the data model can be classified according to a. pre defined classification The first thing to do to classify data is to determine some rules to sort the data s elements. accordingly Those will mainly depend on the chosen classification e g according to the eBKP classification or the. CSI UniFormat Figure 3 a shows the steps of the classification process . The detailed process of the elements classification is essentially done by the software itself However it is essential. to fully understand how the classification works as there will be some unclassified elements For this reason the. classification of elements is also considered in the proposed classification process Figure 3 b . 357, CCC 2018 Proceedings DOI 10 3311 CCC2018 047. a b , Figure 3 Second sub process of the general classification process Classify data a and sub process classify every element b .
Every element will first go through the previously defined classification rules If the element is classified the. process is done If it is not the case there are two possibilities If the same problem occurs several times a new. classification rule must be defined otherwise the element has to be classified individually by hand The probability of. having the same kind or type of object not allocated in a class can easily be checked after the first classification is done. by checking all the unclassified elements It is usually easy to verify if there is a recurrence This process has to be. repeated as long as all elements belonging to a category are not classified or have been classified in the wrong category . 2 3 Check classification, When all the elements are classified a check on the quality of the classification should be made This step could. seem redundant as the elements are sorted according to rules that were defined for the classification but it is an. important part of the process as some problems can still exist Figure 4 a shows the checking process . The first thing to do is to determine some quality assurance rules These rules will depend on the data which are. classified and the expected quality of the classification For example for a quite large classification with few categories. during the early phases of a construction project where everything is not yet precisely defined high precision is not. needed On the other hand when a model is defined in detail the classification needs to be accurate to be useful . a b , Figure 4 The two last sub processes a Check classification and b Take off information. 2 4 Take off information, Finally when the classification is done and the quality controlled The output of the process needs to be determined. and well presented Figure 4 b shows the process to follow in order to obtain useful information The first thing to. do is to determine which quantities are needed When they are determined based on the software used there can be. different ways to get them A convenient way to show data is to use Excel If the same take off is done multiple time . a template can be prepared to present the data , 3 Development of the Solibri Excel tool. Based on the classification process described in the previous section a classification tool has been developed In. this section the specific characteristics of the eBKP H classification and the IFC data model are used . 358, CCC 2018 Proceedings DOI 10 3311 CCC2018 047.
3 1 Check data, The data model format is IFC and the software used Solibri The third step Define accurate rules for data check is. certainly the most important part of this sub process as the rules to check the model are chosen here The first sets of. rules are based on existing rules available in Solibri classified as Structural rules The two existing ruleset are named . BIM Validation Structural and Intersections between Structural Components . Those rules were chosen based on the existing rulesets in Solibri for structural model verification and the ones that. Baukostenplan Hochbau German for cost plan for building construction 4 Although there is a lot of work done regarding the estimate during the early phases of the quantities required for construction projects 9 10 the extensive use of BIM allows quantifying the materials required quickly and reliably to develop cost estimates

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