Haus Gables in Atlanta, GA USA
Jennifer Bonner from MALL, USA
Fire Tower, USA
AKT II, United Kingdom
PEC Structural Engineering, USA
The 2,200-square-foot home is one of only two residences in the country made of cross-laminated timber (CLT), a durable wood material produced by gluing together layers of lumber that alternate in direction.
The stimulation of Haus Gables had Bonner asking: "What if you blurred the lines between real architecture and the media and methods used to simulate it, namely drawings and models?" The project required the work of four engineers including specialists in CLT. The heaviest panels weigh 3,500 pounds, yet all of them were craned into place in just 14 days. The remaining construction took about a year.
This single-family home adjacent to the Atlanta Beltline, a former railway corridor around the core of Atlanta, is a two-story, two-bedroom house assembled from 87 cross-laminated timber (CLT) panels bolted together with 12 inch screws. These massive custom-milled panels, up to 9.5 inches thick and 34 feet long, provide both structure and interior surfacing.
A cluster of six gable roofs are combined to form a single roof. In an attempt to rework spatial paradigms of the past, such as Le Corbusier’s free plan and Adolf Loos’s raumplan, Bonner offers the roof plan as a way to organize architecture. Here, the roof plan establishes rooms, catwalks, and double height spaces in the interior by aligning these spaces to ridges and valleys in the roof above. In this case, the floorplan is a result of the roof.
Two of Dlubal Software’s valuable customers were involved in the design of Haus Gables: Bensonwood and Fire Tower Engineering. Bensonwood first created a DXF file based surface model using their timber specific fabrication CAD model. Fire Tower then took this model, added loads, and ran an in-depth analysis.
Both engineering firms worked together to gather information from the structural model for the foundation engineer to design the podium as well as for Bensonwood to detail the screw and other timber connections. Special consideration was needed to orient the screws and bearing surfaces with respect to the anisotropic properties of the timber.
Using the RF-LAMINATE module within RFEM, CLT capacities and stiffnesses were verified which was critical to the success of the project. This held especially true when the CLT manufacturer (species and layup) changed midway through the design process.
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Programs Used for Structural Analysis
Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements
Deflection analysis and stress design of laminate and sandwich surfaces
Design of steel members according to the American standard ANSI/AISC 360