Entwicklung eines Bausystems für Parkhäuser in Buchenfurnierschichtholz Development of a building system for multi-story car parks using beech laminated veneer lumber www.holz.tum.de
Forschungsverbund Research Network www.holz.tum.de Leitung Head Professur für Entwerfen und Holzbau Associate Professorship of Architectural Design and Timber Construction Prof. Hermann Kaufmann Kooperationspartner Cooperation partners Lehrstuhl für Entwerfen und Konstruieren Chair of Architectural Design and Construction Prof. Florian Nagler Lehrstuhl für Holzbau und Baukonstruktion Chair for Timber Structures and Building Construction Prof. Dr.-Ing. Stefan Winter Lehrstuhl für Holzwissenschaft Chair of Wood Science Prof. Dr. Klaus Richter Professur für Holztechnologie Associate Professorship of Wood Technology Prof. Dr.-Ing Jan-Willem G. van de Kuilen Auftraggeber Client Pollmeier Massivholz GmbH & Co.KG
New building material The timber producer Pollmeier Massivholz GmbH operates a highly-automated production facility in Thuringia producing BauBuche, a laminated veneer lumber (LVL) made of beech that has excellent strength characteristics as well as other technical properties. To expand the range of possible applications of the product, Pollmeier approached the TUM to undertake a research and development project for using BauBuche for the construction of multi-story car parks. Principle of the car park building A modular system for the construction of an aboveground medium to large-sized car park was developed that follows the same basic principle of steel frame systems. The proposed framework is a hybrid construction of columns and beams made of beech laminated veneer lumber (LVL) with floors of precast reinforced concrete elements. In line with current planning practice and larger vehicle sizes, the parking spaces are 2.50 × 5.00 meters with a 6.50 meter lane between them. The wide-span design spans two parking spaces plus the lane allowing the parking spaces to be arranged independently of the column spacing, so that spaces for disabled drivers can be accommodated or space sizes can be adjusted at a later date to meet future vehicle sizes. The span width between supports is 16.50 meters with a load introduction width of 2.50 meters. The height from the surface of the roadway to the underside of the beam is 2.20 meters to provide sufficient reserves for lighting, sprinkler systems, other installations and future renovations that may require additional layers of construction. The story height is 2.93 meters.
Focus Area – Integrated Building Technologies
Flexible planning The basic module can be combined in repetition to create parking decks of virtually any length. The modular principle also makes it possible to extend the car park upwards. The combination of parking system with different ramp types is possible allowing the basic arrangement to be used flexibly to meet different site requirements. Construction The timber-concrete composite beams are comprised of beech laminated veneer lumber (with corresponding technical approval) and precast reinforced concrete elements that are connected to the beams via shear-resistant birdsmouth-section slots. The beam cross-section is 240 × 600 mm high and they are produced with excess height. To protect the wood against moisture ingress and improve its durability, all structural timber elements are coated on their upper surface. The beams rest only at the end of each park level on columns with a square cross section of 240 × 240 mm. Each floor rests on top of the next and columns above each other are coupled using a hollow steel bracket assembly filled with low-shrinkage grouting mortar and secured with dowel pins. This facilitates rapid assembly of the structure while simultaneously keeping the columns independent of the concrete slab. As such any water that pools on the surface of the concrete slab will not impact on the durability of the columns. Neighboring columns in the center of split-level plans are bolted together. Access Access for vehicles is via ramps made of timber beams of beech LVL and precast concrete panels. These are laid
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