STRUCTURAL GLASS FACADES - USC School of Architecture

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designing and producing a fitting. Now there are at least a dozen companies worldwide offering off-the-shelf glass-fixing components of amazing variety. 1.4.5 The Project Constituents The core constituents involved in a structural glass façade project are the owner/developer, architect, building engineer, and perhaps a façade consultant and/or a specialty consultant dealing solely with the structural glass façade. Owner/developers have been exposed to the work of the innovators and early adopters, and are increasingly interested and amenable to considering the use of structural glass façade technology, generally within some budgetary context. The building engineer is important in managing the interface between the structural glass façade and the perimeter support provided by the building structure. Today, the primary driver of the diffusion of this technology into the broader marketplace is the design work coming out of the architect’s offices. The innovators and early adopters typically introduce their client, the owner/developer, to the technology and convince them of incorporating some aspect into a building design. This group of innovators and early adopters is relatively small; the body of completed works is largely from the same small group of practitioners. This group is comprised largely of architectural offices with deep resources including façade designers, industrial designers and even engineers on staff. Such firms as Foster Associates, Renzo Piano Building Workshop, SOM, Murphy Jahn Architects, have the resources internal to the firm to generate highly sophisticated structural glass façade designs. The most effective way to diffuse the technology into the marketplace is to enable another tier of adopter, arguably secondary adopters. Many structural glass façade projects have featured prominently in the media over recent years, spawning much interest in the design community. There are many architects interested in using the technology and confronting 53
their lack of familiarity with it. Many of these architects do not have access to the resources characteristic of the early adopter group. The early adopters often employ the services of a specialty consultant, one of a handful of firms specializing in structural glass façade technology. These firms are most frequently called on to provide conceptual and schematic design services, and some level of design development. The cost of these consultants, however, represents a barrier to the diffusion of the technology; projects budgets tend to be tighter with the potential secondary adopters and the cost of the specialty consultant can be prohibitive. 1.4.6 The Opportunity for Growth The potential for growth is apparent from the previous discussion. The opportunity lies in the convergence of growing demand and a mature technology capable of delivery of increasingly competitive products to a growing marketplace. The opportunity for catalyzing this growth lies in enabling a tier of secondary adopters. The key to accomplishing this is to first establish an appropriate project delivery method that minimizes the requirements laid upon the architect; a strategy that the architect can embrace. Any delivery strategy however, will require some level of expertise on the part of the architect. Once the strategy is understood and accepted by the architect, they must then be provided with the information, tools and resources necessary to implement the strategy; a form of technology transfer. It is likely that the designs produced from such a strategy will be simpler, less costly, and more widely appropriate both functionally and economically to a diversity of commercial building types, but this is exactly what is needed to diffuse the technology into the building marketplace. 54
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STRUCTURAL GLASS FACADES: A UNIQUE
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Dedication To my bride, Victoria Me
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One cannot help but burden others w
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6.4 Other Considerations in Glass S
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Table 6-6 Simple truss attributes.
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List of Figures Figure 1.1 Berlin C
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Figure 2.1 Tension rod rigging term
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Figure 2.28 Diagram of low-E functi
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Figure 6.12 New Beijing Poly Plaza;
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Figure 8.7 Glass and the glass manu
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Abstract This thesis formulates a h
Page 23 and 24: The push by leading architects for
Page 25 and 26: Barriers to Implementation As with
Page 27 and 28: The primary focus of this thesis wi
Page 29 and 30: Chapter 1 - Context 1.1 Structural
Page 31 and 32: facades as used herein refers to th
Page 33 and 34: The vaulted enclosure spans six tra
Page 35 and 36: 1.2.2 Architectural Use of Glass It
Page 37 and 38: the great cathedrals of the period
Page 39 and 40: 1.2.4 Glass as Building Skin Struct
Page 41 and 42: 1.2.5 The Advent of the Curtain Wal
Page 43 and 44: structure is exposed, and thus beco
Page 45 and 46: necessarily the case, however. Nort
Page 47 and 48: and practitioners of this style, Wa
Page 49 and 50: In the same manner, Mies van der Ro
Page 51 and 52: 1.3.2 Emergence of Structural Glass
Page 53 and 54: of glass are transparency, transluc
Page 55 and 56: Opacity is the opposite of transpar
Page 57 and 58: Willis Faber & Dumas Building Ipswi
Page 59 and 60: Figure 1.18 Louvre Pyramid by night
Page 61 and 62: Channel 4 Headquarters London; Rich
Page 63 and 64: presentations on the technology usu
Page 65 and 66: was not constructed until the 1950
Page 67 and 68: 1.3.6 Practitioners The following e
Page 69 and 70: In a common development pattern, se
Page 71 and 72: from the yachting industry and used
Page 73: imitation reveals itself here; repe
Page 77 and 78: Oil prices blowing by USD 100 per b
Page 79 and 80: Chapter 2 - Materials, Processes, a
Page 81 and 82: 2.2.1 Structures and Strategies for
Page 83 and 84: 2.2.2 Strongbacks and Glass Fins St
Page 85 and 86: Various geometries are possible, mo
Page 87 and 88: The application of trusses as part
Page 89 and 90: Figure 2.8 Truss identification: br
Page 91 and 92: A large cavity double-skin façade
Page 93 and 94: Fuller later went on to develop ten
Page 95 and 96: stabilized, or closed systems; stab
Page 97 and 98: 2.2.9.2 Cable Net The addition of h
Page 99 and 100: Kieran Kelley-Sneed, a former profe
Page 101 and 102: these materials. High performance t
Page 103 and 104: or some similar process to produce
Page 105 and 106: Individual wires are fist twisted i
Page 107 and 108: 2.3.3.2 Rods Design innovations are
Page 109 and 110: processing adding value in some man
Page 111 and 112: Table 2-4 Raw materials used in typ
Page 113 and 114: 2.4.1.6 Laminated Glass Laminated g
Page 115 and 116: laminated panel comprised of a temp
Page 117 and 118: of the spacer, and the application
Page 119 and 120: applied by a process of vacuum (spu
Page 121 and 122: The illustration on the left shows
Page 123 and 124: 2.4.1.11 Specifying Glass Specifyin
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to as annealed glass. Subsequent pr
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later) may exhibit worsened distort
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glass above). In fact, perhaps owin
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“Float glass thickness range from
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pieces of glass with a ½” air sp
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A measure of heat gain or heat loss
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Fortunately, glass producers again
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2.5.2 Stick Systems Most curtain wa
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The rainscreen principle has become
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with the outer glass surface. This
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2.5.9 Structural Glazing Structural
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frequently mechanically attaché th
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Alternatively, structural glass fac
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Chapter 3 - Building Products, Proc
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New strategies and project delivery
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costs are extremely low throughout
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3.1.3 Fabrication Fabrication requi
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A design/builder may provide instal
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3.2.1.2 Weaknesses of Design/Bid/Bu
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The budget can be developed along w
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3.2.3.1 Strengths of Design/Assist
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3.3.1.2 Develop an appropriate surf
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3.3.2.1 Representative Drawings Pla
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to related websites. In the case of
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4.2.1 Wizards A common type of desi
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On selection of an exterior color f
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website acts as a resource in suppo
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It is interesting to note that tool
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easons, many interactive tutorials
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“Human Resources In-house expert
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an overall architectural project,
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contextual imagery and a general de
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4.5 The Medium 4.5.1 Print Digital
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cost ranging from 25 to 50 dollars
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Figure 4.8 PowerPoint presentation
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5.1.4 It is conceivable to facilita
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Chapter 1 defines structural glass
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technology into the mainstream cons
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Chapter 6 - Categorization and Orga
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Table 6-2 Morphological categorizat
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6.1.2 Definition of Evaluation Crit
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measure of the relative ease of des
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Material Suppliers and Subcontracto
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to work. There is great opportunity
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eing extremely efficient on a stren
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much as 20-30 percent. Thus, it is
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Figure 6.2 Generalized behavior att
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Design Considerations The strongbac
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Constructability Fabrication: The c
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opportunities for exploring facetin
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Constructability Fabrication: If sp
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square-on-offset-square derived fro
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Glass system interface: Any glass s
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Constructability Fabrication: As di
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Morphology Vertical trusses are ali
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Durability and Maintenance: The con
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Table 6-7 Mast truss attributes. 6.
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problematic, as the structures are
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deflections relative to the façade
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Stability in the cable truss is pro
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Resources and Technology Maturity:
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Installation: Installation is signi
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Design issues: The determination of
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Gymnastics Arena fabric clad tenseg
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Design Considerations Aesthetics: G
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Pre-tension requirements: The cable
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Morphology Cable-hung structures ha
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Glass system interface: The interfa
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Structural Performance Spanning cap
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Structural Efficiency (strength to
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6.2.1 Categorization Scheme Table 6
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6.2.3 Class Comparisons: Applicatio
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Optical Distortion: The heat-treati
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Size Limitation: Viracon, the large
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objective; monolithic panels of low
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equipment. Depending upon these var
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deflections exceed this requirement
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consideration, and should be heat-s
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Transparency Relative transparency
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What follows is a consideration of
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Design issues: These systems must b
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Design Considerations Aesthetics: O
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Constructability Fabrication: All f
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Material Suppliers and Subcontracto
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then treated identically to point-f
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Accommodation of movement: As with
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Geometric flexibility: One of the a
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all-bearing head that provides for
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effectively clamping the glass to t
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Constructability Fabrication: Glass
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For a more sophisticated program us
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lighting costs should also be figur
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Chapter 7 - Tools, Resources, and C
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grid anomalies, and other nonstanda
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7.1 A Simple Case The theory is tha
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7.1.3 Vertical Span / Horizontal Sp
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Figure 7.3 FacadeDesigner.com homep
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The World Wide Web is a unique medi
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Figure 7.5 StructureExplorer Web pa
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This module has not been developed
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deflections. As will be seen, the t
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F af 2 Vm/ryf F y 1- 0.
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F ab 2 Vm/ryb F y 1- 0.
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Calculate front chord stress ratio;
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analysis eliminates the formation o
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Figure 7.9 Dynamic relaxation veloc
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output of the analysis, along with
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Solving for cable force, the additi
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Figure 7.12 FacadeDesigner: select
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Figure 7.13 FacadeDesigner: glass g
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H m = H s / H n V m = V s / V n Or,
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show a vertically oriented glass gr
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FaçadeDesigner is thus linked to S
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elevations, sections and details. T
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inadvertent and unnecessary, and ea
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maximum timeframe. However, the Exp
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Figure 8.2 Introductory page requir
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Figure 8.5 Glass system types are i
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Figure 8.9 Each system type is pres
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application to the AIA/CES to becom
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8.2 Summary The background research
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Long-span façade structures Simpl
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9.1.1 Test Subjects Group A is comp
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The testing of Group A was administ
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Subjective questions 1-5, column 2,
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Table 9-4 Group B, 2nd test results
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Group A 1st Test Correct Respnses I
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y the learning program. This may re
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Group B 1st Test Correct Respnses I
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incorrect responses was 14% in the
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presentation is clearly emboldening
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Figure 9.10 Comparison of group A a
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"Don't Know" Responses by Category;
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Question 10 Tempered glass is
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Group A Incorrect Responses: Change
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This question was answered incorrec
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Perhaps the shift from I-don’t-kn
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Question 14 Glass for point-fixed s
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Please circle one number only for e
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after they were given the presentat
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The average response here fell one
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inclusion in StructureDesigner, and
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V n = number of vertical grid modul
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Table 9-5 Cable net; omparison of t
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H m = horizontal module (ft) H n =
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Table 9-6 Simple truss; comparison
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Chapter 10 - Summary and Conclusion
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pyramid structure when the distribu
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The author is not a Web designer or
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10.2.2 FaçadeDesigner; the Methodo
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Tutorials An objective of FacadeDes
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and load conditions. A testing meth
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The need is for education and resou
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information. Better organization of
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institutions such as the Massachuse
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The important issue of sustainabili
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accommodate application needs from
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10.3.6 Diffusion of Innovation in A
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Bibliography Amato, I 1997. Stuff;
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Cambridge 2000 Gallery 2005. Willis
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Glass skyscraper n.d. Model of glas
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Nardella, M 2007. Interior of Garde
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Seagram Building n.d. Photograph of
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