@inproceedings{MeissnerSchermerAmbergeretal., author = {Meißner, Jonathan and Schermer, Detleff and Amberger, Franziska and Hofmann, Philipp}, title = {Experimental investigations on the influence of eccentric load application on the load bearing capacity of clay unit masonry walls}, series = {18th International Brick and Block Masonry Conference : Proceedings of IB2MaC 2024 Volume 2, 21.-24. July 2024, Birmingham}, booktitle = {18th International Brick and Block Masonry Conference : Proceedings of IB2MaC 2024 Volume 2, 21.-24. July 2024, Birmingham}, editor = {Milani, Gabriele and Ghiassi, Bahman}, publisher = {Springer}, address = {Cham}, isbn = {978-3-031-73309-3}, doi = {10.1007/978-3-031-73310-9_17}, pages = {239 -- 253}, abstract = {For the analysis of centric and double-eccentric wall compression tests, a comprehensive database of different highly thermally insulating clay unit types is being compiled for the first time. The objective of the analysis is, on the one hand, to characterise the load-deformation behaviour of highly thermally insulating clay unit masonry and, on the other hand, to analyse the resulting stress distribution at the cross-section level. In addition, the influence of the increasing load inclination angle with decreasing test specimen slenderness is also shown. With regard to the wall compression tests under double-eccentric loading, the effects caused by the load inclination become obvious and lead to an average reduction of the load-bearing capacity of 41\% compared to the centric compression tests. Furthermore, an opposite effect can also be observed with regard to the generally known interaction between decreasing specimen slenderness and increasing load-bearing capacity. According to this, lower load-bearing capacities result with constant eccentricity and decreasing slenderness, so that a back calculation to a uniform slenderness ratio with the relevant normalisation functions is not possible. The reason for this is due to the linearly increasing load inclination angle and the resulting increasing shear stress within the transverse webs.}, language = {en} } @inproceedings{SchermerMeissnerAmbergeretal., author = {Schermer, Detleff and Meißner, Jonathan and Amberger, Franziska and Hofmann, Philipp}, title = {Numerical investigation for nonlinear internal forces at the exterior wall-floor joints}, series = {18th International Brick and Block Masonry Conference : Proceedings of IB2MaC 2024 Volume 2, 21.-24. July 2024, Birmingham}, booktitle = {18th International Brick and Block Masonry Conference : Proceedings of IB2MaC 2024 Volume 2, 21.-24. July 2024, Birmingham}, editor = {Ghiassi, Bahman and Milani, Gabriele}, publisher = {Springer}, address = {Cham}, isbn = {978-3-031-73310-9}, doi = {10.1007/978-3-031-73310-9_19}, pages = {266 -- 279}, abstract = {The objective of the presented work is the analysis of the numerically determined nodal moments at the exterior wall-floor joint compared to the linear-elastic calculation of a frame section according to Annex C of Eurocode 6, Part 1-1 (EN 1996-1-1). The focus of the comparative analysis is the influence of the structural nonlinearity of the exterior wall-floor joint as well as the acting wall axial force, which are explicitly captured in the FE model in contrast to the linear-elastic frame section. In particular, the contact zone is of special importance for partially supported floor and the associated discontinuous stress distribution between the exterior wall and slab. The reason for this is the fact that the transition zone between the masonry wall and the slab behaves in a highly nonlinear manner due to the lack of tensile strength. The related eccentricity e/a required for the ultimate limit state design is thus significantly influenced by the interaction of the axial force and the resulting joint rotations.}, language = {en} } @incollection{Schermer, author = {Schermer, Detleff}, title = {Kapitel 7A: Mauerwerksbau}, series = {Schneider Bautabellen f{\"u}r Ingenieure : mit Berechnungshinweisen und Beispielen}, booktitle = {Schneider Bautabellen f{\"u}r Ingenieure : mit Berechnungshinweisen und Beispielen}, editor = {Albert, Andrej}, edition = {26. aktualisierte Auflage}, publisher = {Reguvis}, address = {K{\"o}ln}, isbn = {978-3-8462-1479-4}, language = {de} } @inproceedings{HofmannSchermerAmbergeretal., author = {Hofmann, Philipp and Schermer, Detleff and Amberger, Franziska and Meißner, Jonathan}, title = {Substitute test method for the local load bearing capacity of masonry with partially supported slabs}, series = {18th International Brick and Block Masonry Conference : Proceedings of IB2MaC 2024 Volume 2, 21.-24. July 2024, Birmingham}, booktitle = {18th International Brick and Block Masonry Conference : Proceedings of IB2MaC 2024 Volume 2, 21.-24. July 2024, Birmingham}, editor = {Ghiassi, Bahman and Milani, Gabriele}, publisher = {Springer}, address = {Cham}, isbn = {978-3-031-73310-9}, doi = {10.1007/978-3-031-73310-9_21}, pages = {294 -- 307}, abstract = {With increasing thermal insulation requirements and resource-efficient construction methods, demands on building exterior walls are rising. Monolithic exterior walls, devoid of additional insulation, require meticulous planning and execution of the exterior wall-floor joint. Besides addressing building physics, fire safety, and sustainable construction, this detail must meet structural analysis standards. The joint's load-bearing capacity hinges on both the masonry wall and slab loads. Masonry walls primarily bear loads from slabs and roof structures. However, slab loads induce rotation, adding bending stress to the masonry. Bending transmission depends on structural design, material parameters, and axial force, creating parameter interactions. To scrutinize various products and design variants regarding contact stiffness, load distribution, and stress concentrations, the Laboratory for Structural Engineering at the University of Applied Sciences (OTH) in Regensburg, Germany developed specific testing methods. These methods realistically capture load redistribution effects based on perforation patterns and quantify potential loadbearing reserves. Additionally, optimising design regulations based on results can accurately describe masonry's load-deformation behaviour.}, language = {en} } @inproceedings{AmbergerSchermerHofmannetal., author = {Amberger, Franziska and Schermer, Detleff and Hofmann, Philipp and Meißner, Jonathan}, title = {Shear tests on thermal insulating clay unit masonry walls}, series = {18th International Brick and Block Masonry Conference : Proceedings of IB2MaC 2024 Volume 2, 21.-24. July 2024, Birmingham}, booktitle = {18th International Brick and Block Masonry Conference : Proceedings of IB2MaC 2024 Volume 2, 21.-24. July 2024, Birmingham}, editor = {Ghiassi, Bahman and Milani, Gabriele}, publisher = {Springer}, address = {Cham}, isbn = {978-3-031-73310-9}, doi = {10.1007/978-3-031-73310-9_3}, pages = {31 -- 43}, abstract = {Masonry made of highly insulating clay units is a very common construction method, especially in multi-storey residential buildings. To apply this type of construction also in earthquake proven areas, the characterisation of strength and deformation properties under cyclic horizontal loads is essential. For this, a series of full-scale experimental investigations on the behaviour of walls made of thermally insulating clay unit masonry under combined loadings (N-M-V) were carried out in the Laboratory for Structural Engineering at the University of Applied Sciences Regensburg (OTH), Germany. The aim of the static-cyclic tests was to characterise the load-deformation behaviour and the failure mechanism under earthquake loadings. In conventional buildings, stiffening walls are loaded by vertical axial forces and horizontal in-plane loadings. The interaction with the concrete floor slabs leads to restraining effects in real buildings, which create counteracting bending moments. Accordingly, in the test, the loads were applied by a combined loading of bending moment and axial force. Digital image correlation documented deformations to identify failure mechanism. Results indicate that current design approaches according to DIN EN 1996-1-1 are on the safe side regarding the load-bearing capacity of the tested walls contain load-bearing capacity reserves. Based on the failure patterns from digital image correlation, it can be recognised that a strict separation of the individual failure types does not appear to make sense, as the ultimate failure of the test specimens was caused by a combination of several failure types.}, language = {en} } @incollection{MeissnerSchermerAmbergeretal., author = {Meißner, Jonathan and Schermer, Detleff and Amberger, Franziska and Hofmann, Philipp}, title = {Experimentelle und numerische Untersuchungen am Außenwand-Decken-Knoten}, series = {Mauerwerk-Kalender 2025}, volume = {50}, booktitle = {Mauerwerk-Kalender 2025}, editor = {Schermer, Detleff and Brehm, Eric}, publisher = {Ernst \& Sohn Verlag}, address = {Berlin}, isbn = {978-3-433-03445-3}, doi = {10.1002/9783433612019.ch17}, pages = {367 -- 414}, language = {de} }