Druckfestigkeit von Ziegelmauerwerk – aktuelle Auswertungen zur Festlegung von charakteristischen Mauerwerkdruckfestigkeiten in DIN EN 1996

Brameshuber, Wolfgang; Graubohm, Markus; Meyer, Udo

doi:10.1002/dama.201200524

Cited by 5 publications

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“…Based on typical unit and mortar strengths of f b = 25 N/mm 2 and f j = 5 N/mm 2 , respectively, a characteristic masonry strength of Fig. 6 Uniaxial stress-strain relationship for the expanded units f ma,k = 8.1 N/mm 2 is obtained according to [27], corresponding to a mean value of f ma,m = 9.1 N/mm 2 (assuming f ma,k = 0.8 f ma,m [28]). Hence, the normalised unit tensile strength is f bt /f ma = 0.11.…”

Section: Materials Modellingmentioning

confidence: 99%

Influence of spatially variable material properties on the resistance of masonry walls under compression

et al. 2022

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During their assessment, existing masonry structures often reveal a high variability of their material properties. Since this variability is also present within a single wall, the influence of this spatial variability of the material properties on the wall resistance is of major interest. First, experimental investigations on clay brick masonry walls with local weaknesses under compression loading are presented. The results of these experiments serve to validate a finite element model developed to study the influence of spatially variable material properties on the resistance of masonry walls under compression. The model follows the simplified micro-modelling approach and allows for a unit-to-unit variability of the compressive strength and the elastic modulus of masonry. The finite element model is then utilised within Monte Carlo simulations to investigate the resulting probability distribution of the wall resistance for given distributions of the material properties. Finally, parameter studies are conducted to examine the influence of the coefficient of variation of the material properties, the spatial correlation of the material properties, wall length, and wall slenderness on the resulting distribution of the resistance. The studies demonstrate that spatial variability leads to a decrease in the mean value of the wall resistance. However, the resulting variability of the resistance is much smaller than the input variability of the material properties. Considering the spatial nature of the variability can thus lead to higher design/assessment values of the wall resistance and, hence, a positive effect on structural reliability.

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Section: Materials Modellingmentioning

confidence: 99%

Influence of spatially variable material properties on the resistance of masonry walls under compression

et al. 2022

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“…Die im Eurocode 6 angegebenen Werte für die charakteristische Druckfestigkeit von Mauerwerk gelten für neu zu errichtendes Mauerwerk aus Normsteinen und den entsprechenden Mörteln (s. auch [5] und [6]). Für Bestandsbauten empfiehlt es sich, eine konkrete Bewertung durch Beprobung oder eine Umrechnung auf die charakteristische Festigkeit vorzunehmen.…”

Section: Introductionunclassified

Webinar “Anwendung von DIN EN 1996“

Hauschild¹,

Jäger²

2014

Mauerwerk

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“…Jäger and Pech (2014) made discussion on this equation regarding the methodology and underlying mathematical basis for the anticipated update and adaptation of Eurocode 6 (CEN 1996), comparing with equations presented by other researchers. For instance, referring to Brameshuber et al (2012), the authors suggested that the material factor, K is to be reduced by 80% for better estimation of characteristic compressive strength of masonry. Geoff ratio, Young's modulus and the tensile strength of units.…”

Section: 1111mentioning

confidence: 99%

Modelling and structural analysis of historical masonry systems including vaulted structure

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The conservation of historic structures has been given special attention due to their cultural, social and economic importance. However they often show considerable structural vulnerability and have been seriously damaged by natural disasters including earthquakes. An excessive loss of architectural heritage has occurred because of earthquakes. A safety assessment and restoration practice on historical structures has been tackled extensively by professionals including architects and engineers. However, structural assessment of historical buildings is a complex task. Complexity comes from insufficient understanding of the characteristic of historical materials, limited knowledge of the seismic response of historical structures and yet-unknown structural deterioration due to the past natural disasters. Today it is perceived that nonlinear FEM analysis permits detailed study of historical masonry structures. However, in some cases, its application poses difficulties. The difficulties derive from the definition of material properties, the definition of a complex geometry and the analysis procedures. The results depend on the material properties considerably. However, it is not easy to describe appropriately the behaviour of historical materials including masonry in the FEM analysis. The definition of a complex geometry is challenging although the discretisation of accurate geometry is crucial. As for the analysis procedure, one of the difficulties is observed in seismic assessment. FEM-based nonlinear dynamic analysis permits close observation of seismic response of a historical masonry structure but it requires excessive computational effort, for a large-scale structure in particular. On the other hand, pushover can be adopted more efficiently than nonlinear dynamic analysis but the obtained result can be less reliable. All these considerations indicate that the understanding of FEM approaches still needs to be deepened to adopt more accurately and at the same time efficiently for the analysis of historical structures. The present research discusses the applicability of existing nonlinear FEM approaches to the study of masonry historical structures. The FEM analysis is adopted to the analysis of real and complex structures including mixed steel and masonry vaulted systems belonging to the Hospital de Sant Pau in Barcelona and a large single-nave church damaged by the 2009 Abruzzo earthquake. As a final outcome of the research, the conclusions provided criteria and guidelines for the analysis of these types of structures under vertical loading and seismic forces. The achievement of the research will contribute to both engineers and researchers who are involved in the conservation of historical masonry structures especially by means of FEM analysis. La conservación de las estructuras históricas llama la atención debido a su importancia cultural, social y económica. Sin embargo, muestran considerablemente vulnerabilidad estructural y se han dañado seriamente por desastres naturales como terremotos. La excesiva pérdida de patrimonio arquitectónico ha ocurrido a causa de los terremotos. Se ha llevado a cabo la evaluación de la seguridad y la práctica de restauración de estructuras históricas ampliamente por los profesionales incluso arquitectos e ingenieros. No obstante, la evaluación estructural de los edificios históricos es una tarea compleja. La complejidad viene de la comprensión insuficiente de las características de los materiales históricos, conocimiento limitado de la respuesta sísmica de estructuras históricas y deterioro estructural todavía desconocido debido a los desastres naturales pasados. Hoy en día se percibe que el análisis de elementos finitos (FEA) no lineal permite el estudio detallado de las estructuras de mampostería históricos. Con todo, en algunos casos, no es sencilla la aplicación de ello. Las dificultades vienen de la definición de las propiedades del material, la definición de una geometría compleja y los procedimientos de análisis. Los resultados dependen de las propiedades del material considerablemente. Sin embargo, no es fácil describir adecuadamente en el FEA el comportamiento de materiales históricos como mampostería. Es difícil definir la geometría compleja es crucial aunque la discretización de la geometría exacta. En cuanto al procedimiento de análisis, se observa una de las dificultades en la evaluación sísmica. Análisis dinámico no lineal del FEA permite la observación precisa de la respuesta sísmica de las estructuras de mampostería histórica pero requiere el esfuerzo computacional excesivo, especialmente por una estructura a gran escala. Por otro lado, pushover puede ser más eficiente que el análisis dinámico no lineal pero el resultado obtenido por ello puede ser menos fiable. Estas consideraciones indican que la compresión del FEA necesita profundizarse para que se adopte FEA más precisamente y más eficientemente para el análisis de estructuras históricas. La presente investigación analiza la aplicabilidad del FEA no lineal acerca del estudio de las estructuras históricas de mampostería. El FEA se adopta para el análisis de las estructuras reales y complejas incluso los sistemas abovedados de la combinación del acero y mampostería pertenecientes al Hospital de Sant Pau de Barcelona y una gran iglesia de una sola nave dañada por el terremoto de Abruzzo 2009. Como resultado final de la investigación, las conclusiones presentan criterios y directrices para el análisis de estés tipos de estructuras bajo cargas verticales y sísmicas. El fruto de la investigación contribuirá a ambos ingenieros e investigadores que participan en la conservación de las estructuras de mampostería históricos sobre todo por medio del FEA.

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Druckfestigkeit von Ziegelmauerwerk – aktuelle Auswertungen zur Festlegung von charakteristischen Mauerwerkdruckfestigkeiten in DIN EN 1996

Cited by 5 publications

References 0 publications

Influence of spatially variable material properties on the resistance of masonry walls under compression

Influence of spatially variable material properties on the resistance of masonry walls under compression

Webinar “Anwendung von DIN EN 1996“

Modelling and structural analysis of historical masonry systems including vaulted structure

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