02 Fakultät Bau- und Umweltingenieurwissenschaften
Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/3
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Item Open Access Guidelines for a finite element based design of timber structures and their exemplary application on modelling of beech LVL(2023) Töpler, Janusch; Buchholz, Lea; Lukas, Julian; Kuhlmann, UlrikeDesign verifications of buildings are usually carried out supported by a finite element analysis (FEA), for which, however, there are only a few and almost exclusively non-binding application rules. Within the Cluster of Excellence Integrative Computational Design and Construction for Architecture (IntCDC) at the University of Stuttgart, Guidelines for a Finite Element-Based Design of Timber Structures have been developed. The scope of the guidelines is daily engineering practice, expert engineering applications and product development and certification. Essential parts of the guidelines are design procedures, modelling (including geometrical, material and imperfection modelling), analysis, model verification and validation and design. The content and application of the guidelines are described and illustrated in this paper using two benchmarks. These two benchmarks, which are based on experimental investigations, deal with the elastic material modelling of glulam made of beech laminated veneer lumber (beech LVL) and dowel-type connections for beech LVL members. The experimental basis of the benchmarks is described. With the experiments for the benchmarks, all Poisson’s ratios and the complete elastic material stiffness matrix of beech LVL are determined by means of an optical measuring system. The experimentally determined stiffnesses of the investigated dowel-type connections in beech LVL are compared with normative values. Based on the experiments, a numerical model is developed in RFEM (Dlubal).Item Open Access Finite element based design of timber structures(2023) Töpler, Janusch; Schweigler, Michael; Lemaître, Romain; Palma, Pedro; Schenk, Martin; Grönquist, Philippe; Tapia Camú, Cristóbal; Hochreiner, Georg; Kuhlmann, UlrikeItem Open Access Lateral torsional buckling of glulam beam-columns : axial compression and bending verification(2024) Töpler, Janusch; Kuhlmann, Ulrike; Schänzlin, JörgItem Open Access Analytical and numerical investigations on imperfection-sensitive timber members subjected to combined bending and axial compression(2021) Töpler, Janusch; Kuhlmann, UlrikeThe verification of slender timber members at risk of lateral torsional buckling is one of the basic verifications in timber design. However, latest investigations have shown that the design formulas provided in Eurocode 5 for imperfection-sensitive members subjected to combined bending and compression tend to be conservative and more advanced verification methods are needed. Analytical and numerical models are presented that allow for the consideration of the geometrically and materially nonlinear behaviour as well as of the size effect of tensile strength ft,0 for Nx-My-Mz interaction. These models and calculation results increase the understanding of the main influencing parameters of the load-bearing capacity of imperfection-sensitive timber beams and columns and may be the basis of a revision of the current design formulas provided in EN 1995-1-1.Item Open Access In-plane buckling of beech LVL columns(2022) Töpler, Janusch; Kuhlmann, UlrikeItem Open Access FE-gestützte Bemessung im Holzbau(2020) Töpler, Janusch; Kuhlmann, UlrikeIm Rahmen des Forschungsprojekts RP7 im Exzellenzcluster Integrative Computational Design in Architecture and Construction (IntCDC) an der Universität Stuttgart werden zurzeit Regelungen für die FE-gestützte Bemessung von Holzbauteilen entwickelt. In diesem Beitrag werden der aktuelle Stand des Forschungsvorhabens und die noch geplanten Untersuchungen vorgestellt. Schwerpunkte des Vorhabens sind die Verifizierung und Validierung von FE-Modellen, die bautechnische Nachweisführung anhand solcher Modelle und die Materialmodellierung im Holzbau.Item Open Access Imperfections of slender glulam beams(2021) Kuhlmann, Ulrike; Töpler, JanuschItem Open Access Lateral torsional buckling of glulam beams(2023) Töpler, Janusch; Kuhlmann, UlrikeItem Open Access Imperfektionsmessungen an stabilitätsgefährdeten Holzbauteilen : Schlussbericht : Forschungsvorhaben DIBt P 52-5- 13.194-2048/19(2022) Töpler, Janusch; Kuhlmann, UlrikeDie Holztragwerke von 23 Bauvorhaben wurden mit einem Laserscanner vermessen und die Daten von 202 BSH Bindern, 38 Buchen-Furnierschichtholz Bindern und 57 Buchen FSH Stützen in Bezug auf die Montagegenauigkeit und Imperfektionen ausgewertet. Die Messungen wurden direkt nach Montage und Ausrichten der Tragwerke durchgeführt. Für alle gemessenen Imperfektionen galt, dass die Bemessungsansätze nach EN 1995-1-1 auf der sicheren Seite liegen. Zur Ermittlung von Ersatzimperfektionen wurden numerische Vergleichsberechnungen mit Abaqus CAE/2020 durchgeführt. Die Ersatzimperfektionen wurden in Form einer Sinushalbwelle angenommen. Die 95 % Quantilwerte der Vorverformungen wurden ausgewertet und daraus abgeleitete konsistente Bemessungsempfehlungen für Ersatzimperfektionen für die Stabilitätsnachweise nach EN 1995-1-1 angegeben.Item Open Access Polar representation of material elasticity applied to wood and engineered wood products(2023) Grönquist, Philippe; Töpler, Janusch; Tapia Camú, Cristóbal