University of Arkansas Library Annex, Fayetteville, AR USA
Designed to store nearly 2 million library volumes and works of art, the University of Arkansas Library Annex in Fayetteville was built with cross-laminated timber (CLT) roofs, walls and floors, and glulam beams, columns and moment frames.
University of Arkansas, USA
Perry Dean Rogers | Partners Architects, USA
|Architect of Record||
Miller Boskus Lack, USA
Robbins Engineering, USA
|Fabricator Consultant & Design Assistance||
|Awards||2019 WoodWorks Wood Products Council Wood in Schools|
According to the project team, pre-fabrication of the CLT and glulam system helped speed construction and minimized jobsite waste, resulting in a cost-competitive replacement for the traditional steel and tilt-up concrete structure initially suggested by the client. Inside, the wood is left exposed, warming the space and brightening the room to create a comfortable work environment.
Since the area is prone to tornados, the team opted to clad the larger, high-density storage volume with a stone-filled gabion basket base wall to protect against low-flying projectiles, and a heavily charred wood upper shroud that can be easily repaired or replaced while providing a fire- and insect-resistant facade. With these and other design decisions, what could have been an ordinary warehouse storage facility is instead an attractive addition to the University’s campus.
Design was performed utilizing Dlubal software by the fabricators consultant, Holtzpak, and by structural EOR, Robbins Engineering. Utilizing Dlubal software allowed for quick and efficient coordination between the EOR and fabricators consultant regarding structural loading, design assumptions, and element releases.
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Buildings made of cross-laminated timber (CLT), glued-laminated timber and OSB panels modeled with the RFEM program
- General stress analysis
- Graphical and numerical results of stresses and stress ratios fully integrated in RFEM
- Flexible design with different layer compositions
- High efficiency due to few entries required
- Flexibility due to detailed setting options for calculation basis and extent
- Based on the selected material model and the layers contained, a local overall stiffness matrix of the surface in RFEM is generated. The following material models are available:
- Hybrid (for combinations of material models)
- Option to save frequently used layer structures in a database
- Determination of basic, shear and equivalent stresses
- In addition to the basic stresses, the required stresses according to DIN EN 1995-1-1 and the interaction of those stresses are available as results.
- Stress analysis for structural parts of almost any shape
- Equivalent stresses calculated according to different approaches:
- Shape modification hypothesis (von Mises)
- Maximum shear stress criterion (Tresca)
- Maximum principal stress criterion (Rankine)
- Principal strain criterion (Bach)
- Calculation of transversal shear stresses according to Mindlin, Kirchhoff, or user-defined specifications
- Serviceability limit state design by checking surface displacements
- User-defined specifications of limit deflections
- Possibility to consider layer coupling
- Detailed results of individual stress components and ratios in tables and graphics
- Results of stresses for each layer in the model
- Parts list of designed surfaces
- Possible coupling of layers entirely without shear
- Why are the stresses of the 90° orientation not displayed for a layer with the orthotropy direction 90° for σb,90 in RF‑LAMINATE?
- Which Dlubal Software programs can I use to calculate and design timber structures?
- Which add-on modules and programs do I need for laminate and sandwich structures as well as cross-laminated timber (CLT)?
- Is it possible to design timber structures in RFEM or RSTAB?
- How does the "Orthotropic Plastic" material model work in RFEM?
- Why is it not possible to design any LVL material according to the SIA 265 standard in RF‑/TIMBER Pro?
- How is it possible to display the library of RF‑LAMINATE? We would like to check this is up to date.
- How is the coupling between the individual layers controlled in the RF‑LAMINATE add-on module?
- Can I use surface releases to separate two overlapping surfaces?
- In RF-/TIMBER AWC and RF-/TIMBER CSA, I receive the error that says torsion limit exceeded. How do I bypass this error message?
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
Design of timber members according to the American standard ANSI/AWC NDS
Deflection analysis and stress design of laminate and sandwich surfaces
Dynamic analysis of natural frequencies and mode shapes of member, surface, and solid models
Seismic and static load analysis using the multi-modal response spectrum analysis