Modellierung von seismisch beanspruchten Mauerwerksausfachungen in Stahlbetonrahmentragwerken

Kubalski, Thomas; Klinkel, Sven (Thesis advisor); Goldack, Arndt (Thesis advisor); Butenweg, Christoph (Thesis advisor)

Aachen : Lehrstuhl für Baustatik und Baudynamik (2022, 2023)
Book, Dissertation / PhD Thesis

In: Schriftenreihe des Lehrstuhls für Baustatik und Baudynamik der RWTH Aachen 18 (2022)
Page(s)/Article-Nr.: 199 Seiten

Dissertation, RWTH Aachen University, 2022

Abstract

The current thesis addresses the design and modelling of masonry infills in reinforced concrete frame structures, subjected to horizontal loadings in and out of their plane. Notably when it comes to earthquakes, high loads on frame and infill may result due to the large relative displacements. Despite the availability of calculation procedures in literature, the infills are usually considered as non-structural elements and thus are not taken into account during the design process of the framed structures in common practice. This neglect in the design as well as the general susceptibility of this construction method to horizontal loads are reflected in the numerous damages to infilled frame structures during past earthquakes. During the calculation procedure, the representation of the infills can be carried out using different scales of numerical modelling, which differ in the underlying complexity. Within this thesis, an approach to represent the masonry infill based on a so-called macro model is presented. Using the finite element method, several element types are chosen, which are combined with different material formulations according to their function within the macro model. The main failure modes are represented seperately by phenomenological material models. As far as possible, established approaches from literature are used. These are optimised for the current problem by appropriate modifications. Both loading directions in and out-of-plane are initially represented separately. This results in two models that can be used independently of each other for the modelling of the different load-bearing characteristics of the infill in each direction. Due to the spatial nature of earthquake actions that do not act exclusively in one direction, the models for the two loading directions are coupled with each other by means of corresponding interaction approaches. Therefore, the mutual influence of damage in one direction on the bearing capacity in the other direction can be taken into account. Following the final validation based on experimental investigations, a macromodel for the complete representation of masonry infills in framed structures is thus available for use within three-dimensional models. Due to the more accurate calculation of the resulting stresses a higher level of safety may be realised during the design of the structure.