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The 3 Building Parts Best Suited for Prefabrication

Thursday, February 12th, 2015

 

During a house building. Civil Engineering in GermanyPrefabrication is an important tool for those practicing industrialized construction.

But not everything on a project is delivered more efficiently with prefabrication. Some components or elements of a building are more suited for prefab than others.

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Best Suited for #Prefab”

Standardized building systems, complex assemblies, and repetitive subcomponents of a building are three examples of applications likely to be successful with prefab.

1. “Unnoticed” Building Systems

Commodity assemblies – parts mostly required by code – often go unnoticed. These building systems don’t make or break the finished project, and so they are more price-sensitive than other systems.

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BIM Brings Changes to Façade Design

Thursday, February 5th, 2015

 

The following post is an excerpt from Technological Changes Brought by BIM to Façade Design.


IT and Façade Design

To meet the requirements for energy-efficient, green, and sustainable buildings, and respond to the increasingly serious shortage of contractors and necessary increase of cost, industrialization of façade design engineering is one of the development trends of the architectural envelope industry. Industrialization of façade design engineering must be promoted by the industry and, in turn, its improvement can boost promotion.

CAD and VR

Since the birth of CAD in the last century, engineers have abandoned manual drawing and turned to electronic drawing. This has changed traditional design methods and brought the first revolution in the façade design engineering field.

To manage the CAD data, information technology also underwent a three-stage evolution from CAD file management, to CAD database management, to product data management (PDM). PDM is an integrated working mode that can provide a façade design collaboration environment for sharing, so that designers can work on the same database, reducing unnecessary condition transfer and confirmation and fully sharing information resources.

The rapid development of three-dimensional modeling and virtual reality technology helps improve communication efficiency among the multiple parties involved in façade design.

The visual expression of a three-dimensional model can help architects and façade designers freely exchange ideas and deliberate on the designed volume, shape, façade, and exterior space throughout the design, but the aforesaid façade surface model cannot hold more design information for construction and installation.

In addition to the physical dimensions of the architectural envelope and required materials, design information also includes wind pressure resistant strength, seismic resistance, air tightness, water tightness, transformation, construction technology, heat transfer coefficient, etc. Indetermination of such information will lead to poor efficiency in subsequent work, such as building estimate and budget, fabrication, field installation, etc.

VDC and BIM

Industry demands promote the continuous integration of three-dimensional geometry-based modeling technology, virtual reality technology, and BIM technology, and development toward integrated application.

Virtual design and construction (VDC) is another concept becoming popular in the engineering construction industry. It requires, through the multidisciplinary parametric models provided by design, construction, operation, and maintenance teams in project construction, integration of building facility information, the construction process, and the management organization to ensure the achievement of general management objectives for the project.

If the VDC management concept can be implemented, we will be able to capture and reuse data from conceptual design to prefabrication and even in downstream processes, and apply the data to the entire process from concept design, to modular construction, to component prefabrication.

Then, we will have the chance for “building industrialization.”

BIM is one of the core technologies of implementing VDC. BIM technology is highly correlated with industrialization of façade design engineering logically.

Based on BIM, the carrier of building information, not only the visual design, multidisciplinary integration correction, panel optimization analysis, and quantity calculation for the architectural envelope, can be possible.

A breakthrough can be made, specifically, the mode of documentation in design delivery in the traditional building industry serves no one well. Instead, the panel fabrication drawing can be directly generated and the component fabrication data can be directly extracted from the design model, which makes possible the paperless design and plant fabrication of the curtain wall unit.

BIM technology has become the inevitable choice for industrialized development of the architectural envelope industry.

Tweet: #BIM tech has become the inevitable choice for #architectural envelope industry. #AEC @3DSAEC @Dassault3DS http://ctt.ec/0SlP3+Click to tweet:”#BIM tech has become the
inevitable choice for #architectural envelope industry.”

BIM-based façade design features Parametric design

BIM parametric design changes all the elements of a façade fabrication to a functional variable, and then, by changing the function, or to say, by changing the algorithm, drives the façade panel shape to change, thus creating different building design schemes.

As an art of building, façade design fundamentally has an anti-logic basis. As aesthetic theory goes, there is no debate for taste. Sticking to conventional thoughts will never lead to the palace of art.

However, parametric design is not contradictory to traditional building design. It is oriented to the future, and has many unimaginable forms. It is a tool that can inspire designers.

Tweet: #Parametric design has many unimaginable forms; it's a tool that can inspire #designers. #AEC @3DSAEC @Dassault3DS http://ctt.ec/vkF14+Click to tweet: “#Parametric design has many
unimaginable forms; it’s a tool that can inspire #designers.”

In BIM parametric design, all real attributes of façade fabrication components are given a parametric simulation and calculation, as well as related data statistics. In BIM parametric design, a façade component is not only a virtual geometric component, but also has other geometric attributes, such as component material, thermal performance, cost, as well as purchase information, weight, installation number, etc.

The significance of BIM parametric design is that we can, according to different design parameters, quickly conduct calculations and statistical analyses on modeling, layout, energy conservation, evacuation, etc. and then give priority to the most appropriate scheme.

This is where BIM parametric design differs from ordinary parametric design that is only for the realization of geometric modeling.

SKY SOHU Project BIM models

SKY SOHU Project BIM models

It is noteworthy that the concept of parameterization is different from the concept of parametric design.

Parameterization refers to the modeling capability of BIM software, which is an important guarantee for realization of parametric design. BIM software applicable to façade design must, first of all, provide “accurate” BIM capability to ensure that the modeling accuracy of small BIM components, such as round hole, bent piece, etc., is within the allowable plant fabrication error range.

The American Institute of Architects (AIA) uses level of detail (LOD) to define the accuracy of building components in BIM. According to LOD, BIM evolves from an approximate model to an accurate completed model through the progress of project, and the model accuracy is from the rough to the subtle:

  • LOD100. Conceptual.
  • LOD 200. Approximate Geometry (scheme and enlarged preliminary).
  • LOD 300. Precise Geometry (construction drawing and detailed construction drawing).
  • LOD400. Fabrication.
  • LOD 500. As-built.

For an ordinary building design, when the model accuracy is within LOD100 to LOD300, the design delivery can be completed; but for a façade design, to ensure the design delivery model can be applied in subsequent plant fabrication, the modeling capability of the BIM software must reach LOD400.

Knowledge-based visual design

A BIM-based three-dimensional virtual design environment helps quickly transfer design information and simulated information to project partners, so as to improve their communication efficiency, make possible WYSIWYG (what you see is what you get), and reduce economic losses caused by redesign. Visualization can be used for design clarification of detail structure joints, such as the façade panel edge, corner, hole, junction, and beam bottom flashing and trim. Besides, visual display can help quickly discover any conflicts among disciplines and improve design quality.

Curtain Wall Joints of CABR Research Building (Source: CABRTECH BIM Team)

Curtain Wall Joints of CABR Research Building (Source: CABRTECH BIM Team)

BIM visualization is automatically generated via the information for entity components. We can have the multi-view sectional drawings and axonometric drawings of a curtain wall model automatically generated to transfer information.

There are correlative and feedback relations among the components in such a “tridimensional wall.”

When a façade design engineer modifies a component, all the views in relation to the component will be automatically updated, saving us the trouble of modifying the plan, elevation, and section respectively.

The “correlative” visual feature is conducive to improving communication efficiency and also improving design engineer work efficiency, solving the long-standing problem of discrepancies among, omissions in, and incompletion of drawings.

“Top-down” design

From concept design, to modeling design detailing, to plant fabrication, to the final installation, the curtain wall is involved in many steps and covers both building and mechanical fabrication fields. In most cases, data cannot be smoothly connected, and data chain breaking may occur.

Based on data chain inheritability underlined by detailed BIM design, and with BIM as carrier, the “top-down” design idea can help accurately get the upstream curved surface modeling data and also accurately coordinate fabrication.

For “top-down” BIM design, it is required to first construct a “top basic skeleton” of the design, and then make copies, modifications, and detailing based on this “top basic skeleton” in the subsequent design process, finally completing the detailed design.

For example, the entire façade design engineering of a project is the highest-level “top basic skeleton”. The tower, floor and other parts can be broken down into several levels of “top basic skeleton” and each can show the geometric shape and spatial position of the façade panels in the part, and reflect the geometric constraint relation with other “top basic skeletons.”

Thus, the “top basic skeleton” is the core of the detailed “top-down” façade design development, and also the bridge and link for the interrelation among façade panel components.

The parametric modeling capability of BIM software is the basis for the smooth development of detailed “top-down” design.

In BIM-based parametric modelling, design can be automatically modified by parameter driving. There is an obvious corresponding relation and global correlation between the parameters and the controlled sizes of the model, so that the transfer of model data changes from and to different levels enjoys uniqueness and instantaneity. The “top-down” BIM design has two main characteristics:

The geometric modeling of the façade fabrications can be easily transformed to building components with real attributes. When we change parameters to make geometric shape change, building components change accordingly, which relates visual shape to real façade fabrication components, so that the visual model is transformed to a real “information model”. In the detailed design of a metal curtain wall, for instance, BIM-base technology can help, according to architect’s requirements, generate a large complex curved surface, easily divide the curved surface, and cut the shape into small, simple-technology, material-saving curved panels suitable for mass production.

Then, via sheet metal unfolding, turn them into drawings of plan view size, and make perform cutting and blanking with fewer errors or error free. Furthermore, using the building components with real attributes, an enterprise can gradually enrich and complete its parametric curtain wall component library, conducive to accumulation and reuse of enterprise knowledge.

After the shapes and positions of “top basic skeleton” are satisfactory, optimizing special-shaped curved panels can be done to meet the requirements of complex surfaces for fabrication, transportation, installation, and cost.

The façade designer modifies the shapes of curved panels by parameter driving, and, within the allowable visual error range, replaces double curved surfaces with single curved surfaces, and curved surfaces with flat surfaces, to generate a standard, simple façade fabrication wherever possible. In the meantime, the façade designer must give consideration to cost, construction difficulty, physical performance, and nice appearance.

For instance, the façade designer must take into consideration the supply situation for panels and the fabrication parameters of numerical control machine tools, and calculate the maximum sizes of panels, for purposes of gradual optimization and balance between nice look and cost efficiency.

The reason why BIM software can enable panel optimization lies in its excellent parametric modeling capability and its real-time data extraction capability.

Because the façade model contains geometric information (about panels, keels, connecting pieces, supports, and embedded parts), material information, and management information, when the façade panel shape changes, the corresponding material list and cost information is generated quickly. Because the cost of a special-shaped, curved-surface façade panel is uncertain, the adjustment of the curtain wall shape will definitely change a series of factors, including component cost and fabrication requirements.

BIM can correlate all the factors to form a data model with a dynamic update function, which is used to continuously improve and optimize the previous curved-surface façade models, compare the cost indicators for different design schemes in real time according to the output tabular bills of quantities, and, through a step-by-step iterative loop, finally make possible the balance between nice look and cost efficiency.

Automatic professional correction

As façade design engineering becomes more and more complex, there is a trend of cross-disciplinary cooperation in façade design. When the main structure is nearly completed, façade engineering can start, together with electromechanical engineering.

Façade design is closely related to other disciplines in terms of spatial position. BIM can change the traditional mode-of-work coordination among architects, structural engineers, and façade design engineers, and integrate the BIM models of different disciplines for interdisciplinary collision detection to discover the geometric position conflicts among different disciplines in advance.

For instance, through interdisciplinary collision detection, we can determine:

  • the reserved room between curtain wall keel and concrete structure
  • whether the structure leaves adequate room to the façade fabrication
  • whether the positions of embedded parts are accurate
  • whether there are any conflicts with decor and electromechanical positions

In another instance, we can examine whether the positions of large trimmings and logos are matched with the façade fabrication structure to determine whether there are any conflicts between the building and the façade fabrication.

Changes brought by BIM-based design to subsequent processes

Model-based design delivery

Model-based design delivery is one of the important means of industrialization of the architectural envelope industry. As façade fabrication is mostly customized in plants, design and fabrication are closely combined. Compared with traditional manufacturing, façade panel units enjoy a higher degree of customization, which is reflected by not only different designs for different projects but also different façade panels even in a project, fast and flexible production is needed.

Apparently, the mass production based on standardization and regularization of façade panel units is not the mainstream direction of industrialization of façade design engineering.

BIM-based design delivery can help avoid information loss in the transformation of two-dimensional design to three-dimensional fabrication model, and accurately transfer the façade design data to the numerical control machine tools, directly used for façade fabrication.

Therefore, the complete, accurate transfer of design data and automatic digital fabrication can not only improve building quality, but also reduce the huge waste arising from the design to different fabrication steps, which may be the industrialization development trend of the future architectural envelop industry.

Virtual assembly

Recently, unitized façade fabrication is increasingly being applied. Because unitized façade panels are fabricated and assembled in workshops, the builders working at the construction site must have a good knowledge of the façade panels for different façades and of different floor heights and types, so as to have them correspond to the right positions.

After the detailed BIM-based façade design is completed, the components, such as unit panels, keel frames, and irregular profiles, can be given unique codes according to data planning; then the façade model of the whole building is assembled, and the data can be extracted to generate a material list. In the material list, each component has a unique number.

The Installation Number of Façade Panels Generated From the BIM Models of GALAXY SOHO Project [2]

The Installation Number of Façade Panels Generated From the BIM Models of GALAXY SOHO Project [2]

Blanking, fabrication, and management of material placement are done according to the numbers and the units are quickly assembled according to the standard unit template drawings.

It is required to note the information about fabrication, transportation, and installation direction and sequence in the façade panels. BIM means can then be employed to preassemble the façade panel to better arrange the multi-operational construction plan and installation sequence, scientifically create site planning, reasonably arrange the construction period, improve installation quality, and reduce the idling of the labor force.

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Whitepaper: Tech Changes Brought by BIM to Façade DesignExcerpted from Technological Changes Brought by BIM to Façade Design

To read more, download the full whitepaper

Learn about the Dassault Systémes Industry Solution Experience Façade Design for Fabrication

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The Curtain Wall Industry: History, Current State, and Challenges of Façade Design

Thursday, January 29th, 2015

The Evolution of Façade Design

The first building introduced with a curtain wall was the Crystal Palace in the Great Exhibition held in London in 1851.

The Crystal Palace in the Great Exhibition held in London in 1851. Appearance of Crystal Palace (right), Interior (left).

The Crystal Palace in the Great Exhibition held in London in 1851. Appearance of Crystal Palace (right), Interior (left).

The Crystal Palace in the Great Exhibition, London, 1851, pioneered façade design. For the exhibition hall for most exhibits, a greenhouse-like frame glass structure was adopted, which not only rendered the Crystal Palace the most glorious of all exhibits, but also pioneered façade design engineering.

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BIM and Façade Design: Technological Implications [Whitepaper]

Thursday, January 15th, 2015

 

The following is the introductory section of “Technological Changes Brought by BIM to Façade Design”

Download the full whitepaper.


With the continuous progress of building industry technologies and people’s constant pursuit of sustainable buildings, Building Information Modeling (BIM) has been a new subject heatedly discussed and explored in the building industry.

SKY SOHU Project BIM models

SKY SOHU Project BIM models

Thanks to its advantages of visualization, coordination, simulation, optimization, and drawing-making, BIM has sparked great changes in engineering construction, and is becoming widely popular in Asian countries.

Countries including the U.S., the U.K., Singapore, South Korea, and Japan have issued BIM guidance standards for the application and development of BIM.

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Customized Efficiency

Thursday, January 8th, 2015

 

The following is a reprint of a Compass: The 3DEXPERIENCE Magazine article by Vicki Speed.

CustomizedEfficiencyImage1

The Permasteelisa Group, based in Italy, is a leading worldwide contractor in the engineering, manufacture and installation of architectural envelopes and interior systems.

Compass spoke to Permasteelisa IT project manager Federico Momesso and communication manager Massimiliano Fanzaga about how the company is adopting more standardized technologies and processes to better meet the construction industry’s growing demand for customized building systems on short timelines.

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What is Building Lifecycle Management (BLM)?

Thursday, December 11th, 2014

 

Building Lifecycle Management (BLM) is the practice of designing, constructing, and operating a facility with a single set of interoperable data.

BLM puts into practice a BIM Level 3 approach that enables a highly efficient Extended Collaboration process based on Manufacturing industry best practices.

BLM is operationalized via a robust Product Lifecycle Management (PLM)* system, which creates an efficient environment for coordinating complex AEC data.

[*The traditional Product Lifecycle Management term commonly becomes Project Lifecycle Management when applied to AEC.]

Adding BIM data to a PLM system creates a BLM system:

BIM + PLM = BLM

Benefits of BLM

BLM enables BIM Level 3 and can increase construction predictability, long-term value for project owners, and profitability for AEC project contributors.

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Cristiano Ceccato’s 4 Key Lessons for Integrated Design

Thursday, November 20th, 2014

 

cristiano_ceccato

Cristiano Ceccato,
Zaha Hadid Architects

During his keynote address at a recent Dassault Systèmes event in Japan, Cristiano Ceccato of Zaha Hadid Architects explained how techniques borrowed from other industries have been applied to some of his firm’s innovative projects.

Tweet: How techniques from other industries are applied to @ZAHAArchitect's innovative projects. @Dassault3DS #AEC http://ctt.ec/2632K+Click to tweet: “How techniques from other industries
are applied to @ZHA_News’ innovative projects”

Ceccato also examined what happens when designers transfer digital data into the built realm, thereby moving away from the perfection of the computer into the “imperfections” of a real construction environment.

Here is his advice for the architecture community:

1. Build Like Boeing

During his cross-disciplinary research with Boeing, Ceccato saw that the firm was able to take on great risks to develop innovative ways of working.

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3DEXPERIENCE FORUM: AEC Industry Track Recap

Tuesday, November 11th, 2014

 

AEC leaders gathered in Las Vegas this week to take part in the Dassault Systèmes 3DEXPERIENCE FORUM, a unique event that explores innovation across a number of industries.

“It was valuable to listen to real practices.”
– 3DXForum AEC track attendee 11/11/14

Collaborative Design and Industrialized Construction

The AEC track on the afternoon of November 11, 2014 inspired participants to take on industry challenges such as providing a high quality experience for tenants while completing under budgets, maintaining sustainability, improving project productivity and efficiency, and ensuring construction worker safety.

Attendees were also encouraged to envision the future of their firms by understanding how Owners, Architects, Engineers, Contractors, Product Manufacturers, and Fabricators can collaborate using the 3DEXPERIENCE platform in a cloud environment to achieve efficient, industrialized construction practices and BIM Level 3 adoptions.

In the opening session, speaker Marty Doscher (Vice President, Architecture, Engineering and Construction, Dassault Systèmes) discussed how 3D adoption has spread through the Architecture, Engineering and Construction industry and that now is the time to evolve to BIM Level 3.

This session explained how 3DEXPERIENCE Business Solutions provides the new and innovative scheme of design and construction processes delivering Building Life Cycle Management.

Industrializing Construction: Industry Solutions Based on Best Practices from Manufacturing

Peter Terwilliger (Solution Experience Director, Architecture, Engineering and Construction, Dassault Systèmes) demonstrated Dassault Systèmes Industrialized Construction solutions, featuring project modeling applications built on the cloud-based, collaborative 3DEXPERIENCE platform.

“The 3DEXPERIENCE platform interface is beautiful and looks like easy to use”
– 3DXForum AEC track attendee 11/11/14

The comprehensive project management and execution solutions leverage the power of 3D to efficiently and consistently cover construction project requirements end-to-end, from planning to fabrication.

Screen Shot 2014-11-12 at 11.22.23 AM (more…)

Building Lifecycle Management Fosters a BIM Level 3 Approach for End-to-End AEC Collaboration [Whitepaper]

Thursday, October 2nd, 2014

 

Cover: END-TO-END COLLABORATION ENABLED BY BIM LEVEL 3 An Industry Approach Based on Best Practices from ManufacturingIndustrialization techniques have been commonly used in Manufacturing industries for decades. Now the use of Industrialized Construction in AEC is expanding to help improve planning, design, construction, and assembly for increased sustainability, optimized operations, lower costs, and greater safety.

With the growing adoption of BIM, companies can further benefit by implementing a Building Lifecycle Management (BLM) system. BLM puts into practice a BIM Level 3 approach that enables a highly efficient Extended Collaboration model based on Product Lifecycle Management (PLM) and Manufacturing industry best practices.

Dassault Systèmes has just published an industry paper proposing an Extended Collaboration model for AEC, based on Manufacturing industry best practices.

Extended Collaboration Model for Design, Construction, and Operations

The concepts covered include:

  • How a Design Review process helps connect architects and building product system manufacturers to reduce the number of issues that must be formally clarified by RFIs and submittals during project delivery
  • How Process Simulation can reveal even minor integration errors, illustrate which processes are the most cost- and time-effective, demonstrate how prefabrication will affect a project, and generate highly accurate sequence data
  • How collaborative processes and advanced technologies streamline operations and improve project outcomes, illustrated by examples and client case studies
  • How to unlock BIM data, making it “transactable” across the extended project team, to achieve BIM Level 3
  • The limitations of BIM Level 2 point solutions
  • BLM system benefits, and features of the Dassault Systèmes 3DEXPERIENCE® platform and applications
  • How to approach the implementation of a BLM system

… and more.

(more…)

Increasing Efficiency By Adopting Lean Construction Practices

Thursday, August 7th, 2014

 
McGraw Hill Construction, the Lean Construction Institute, and Dassault Systèmes teamed up to produce an in-depth report on Lean Construction. Below is an excerpt from that report on increasing efficiency through better practices.


Practices Adopted to Increase Efficiency

While taking a formal Lean approach is relatively new to the construction industry, many of the practices that are intended to increase efficiency have been adopted for a longer period of time.
(more…)

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