02 Fakultät Bau- und Umweltingenieurwissenschaften
Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/3
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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 Influence of the geometric properties, the timber-concrete interface, and the load protocol on the mechanical properties of timber-concrete composite connections(2024) Mönch, Simon; Campos, Joana A. A.; Dias, Alfredo M. P. G.; Kuhlmann, UlrikeTimber-concrete composite (TCC) structural systems are characterized by the combination of timber and concrete, which are connected to transmit shear forces between the two elements. In addition, to achieve an efficient connection, the slip between the two materials should be limited. Therefore, the load-carrying capacity, the stiffness, and the failure mode of TCC connections are important for the behavior of the composite element. This work aims to investigate the influence of test conditions on TCC connections using shear tests to determine the mechanical properties of connections. Therefore, it is essential to understand the influence of the configuration of the specimens (symmetric as push-out tests or asymmetric as inclined tests), the type of interface between the timber and concrete, and the test procedure (static or cyclic load protocol) on the resulting load-carrying capacity, stiffness, and failure modes. This paper reviews experimental tests conducted on TCC shear connection specimens, using various configurations to assess the influence of the test specimen configuration, material interface, and testing protocol on the determination of the mechanical properties.Item Open Access Fatigue of welded tubular K‐joints made up of circular hollow sections(2022) Kuhlmann, Ulrike; Dürr, André; Bove, Simon; Roth, Jakob; Knecht, WigandThis article deals with the fatigue behaviour of thick‐walled welded K‐joints made up of circular hollow sections (CHS). Two important aspects of the investigations were the extension of the application range to large CHS and the development of practice‐oriented recommendations for fabrication and quality assurance for weld shape and weld quality. For this purpose, fatigue tests were conducted on large CHS joints and on single K‐joints with specified weld irregularities. These studies were accompanied by systematic ultrasonic tests using the phased‐array technique, which were also used for the development of an inspection method for these complex weld geometries. Based on the results achieved by these experimental studies and additional numerical and statistical investigations, a proposal for a German design guideline (DASt‐Richtlinie 029) was finally elaborated to promote the practical implementation of trusses made up of CHS with thick‐walled chords and also to take a first step towards standardization.Item Open Access Lateral torsional buckling of glulam beams(2023) Töpler, Janusch; Kuhlmann, UlrikeItem Open Access New approach for the design shear resistance of headed studs in profiled steel sheeting with ribs transverse to supporting beam(2020) Konrad, Matthias; Eggert, Florian; Kuhlmann, Ulrike; Schorr, JohannesThis article presents new equations for the design shear resistance of headed studs in solid concrete slabs and new reduction factors that consider the influence of profiled steel sheeting with ribs transverse to the supporting beam. Comparisons with push‐out test results show that the current reduction factor kt in Eurocode 4 does not take sufficiently into account parameters such as geometry or position of the headed stud in the rib. Therefore, the mean shear test results are overestimated by the current equations. When introducing the new approach for the design resistance of headed studs, the main focus is on the description of the basic procedure for the development of the new approach and on the comparison with values in the existing code. Comparisons with push‐out test results from a recent European project have shown the good quality of the new approach.