TY - CHAP A1 - Seidl, Günter A1 - Schmitt, Victor A1 - Lorenc, Wojciech T1 - Brücken mit Verbunddübelleisten BT - Entwurf, Bemessung und Ausführungsbeispiele T2 - Tagungsband 31. Dresdner Brückenbausymposium KW - Brücke KW - Verbundbrücke KW - Verbunddübel KW - Stahlbetonbrücke Y1 - 2022 UR - https://tu-dresden.de/bu/bauingenieurwesen/imb/das-institut/veranstaltungen/DBBS/30.-31.-dbbs SN - 978-3-86780-709-8 SN - 1613-1169 SP - 27 EP - 40 CY - Dresden ER - TY - JOUR A1 - Lorenc, Wojciech A1 - Kurz, Wolfgang A1 - Seidl, Günter T1 - Hybrid steel-concrete sections for bridges : definition and basis for design JF - Engineering Structures N2 - This paper introduces (both formally and technically) a new concept: a hybrid steel–concrete cross section. The definition is based on the shear force transmission mechanism and it assumes the existence of a new type of shear connections, i.e. composite dowels. The hybrid cross-section is a generalization of composite steel-and-reinforced concrete cross sections and it is defined by a new way of dimensioning for vertical shear. The hybrid cross section concept is based on a specific approach to the lever arm of internal forces and an assumption that the local shear transfer mechanism of composite dowels is different than in the case of classic welded studs. The concept makes it possible to show by design calculations that the shear force is transferred through jointly the concrete part and the steel part. It is worth emphasizing that the proposed concept is a response to the new opportunities provided to engineers by composite dowels and to the fact that the bridge structures designed nowadays are different from the ones designed previously. The concept enables the design of completely new types of composite steel–concrete beams. The presented theoretical analyses verified by means of FEM show how the change of the shear connection level influences the division of the shear force in the cross section. This is included in the design concept through the internal lever arm of the hybrid section. The proposed concept has been shown to be internally consistent and complete. KW - Verbundbrücke KW - Stahlbetonbrücke KW - Verbunddübel Y1 - 2022 U6 - https://doi.org/10.1016/j.engstruct.2022.114902 SN - 1873-7323 VL - 270 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Lorenc, Wojciech A1 - Seidl, Günter A1 - Berthellemy, Jacques T1 - The evolution of the shape of composite dowels JF - Studia geotechnica et mechanica N2 - Composite dowels have opened new possibilities for engineers designing composite structures. The fundamental and most important characteristic of composite dowels is the shape of the cutting line. It is important to understand why only one particular shape of the cutting line is used in bridge engineering, while so many different shapes have been investigated by many researchers. The essential part of the process of developing composite dowels – the development of the shape of the cutting line – is presented in this paper. The influence of the steel web thickness is presented, and technological problems of steel fabrication are highlighted. The role of empirical experience from the first bridges, push-out tests, and finite element simulations is presented. Assumptions for numerical procedures are given. The distinction between the steel failure and concrete failure modes is introduced for composite dowels. The paper presents how the concept of “shape” was divided into “shape,” “ratio,” and finally “size,” and how, because of the fatigue problems in bridges, all the three factors have emerged to result in the form of shapes that can satisfy the requirements for bridges. Research leading to the invention of the first version of the clothoidal shape is presented. KW - Verbunddübel KW - Verbundbrücke KW - Materialermüdung KW - Finite-Elemente-Methode Y1 - 2022 U6 - https://doi.org/10.2478/sgem-2022-0021 SN - 2083-831X VL - 44 IS - 4 SP - 296 EP - 316 CY - Wrocław ER - TY - JOUR A1 - Lorenc, Wojciech A1 - Seidl, Günter T1 - Composite dowels for bridges : trends and challenges for new european design rules JF - ce/papers N2 - The introduction of composite dowels (CDs) in Europe at the beginning of the last decade led to the creation of new forms of composite bridges in which a T-profile is used instead of an I-beam. Both the construction and design methods are new [4]. Experiences from the construction of new bridges and discussion between the authors lead to new significant conclusions, which should be included in the new European approval (CEN-TS). The problem of design formulas for concrete dowels is presented. KW - Scherverbindung KW - Verbunddübel KW - Verbundbrücke KW - Hochbau Y1 - 2023 U6 - https://doi.org/10.1002/cepa.1897 SN - 2509-7075 VL - 6 IS - 1 SP - 118 EP - 129 PB - Ernst & Sohn CY - Berlin ER -