Print Email Facebook Twitter A Hyperbolic model for Degradation in Tension mode-I Fracture of Masonry Title A Hyperbolic model for Degradation in Tension mode-I Fracture of Masonry: Implementation and Validation in Engineering masonry model Author Bindiganavile Ramadas, Srinidhi (TU Delft Civil Engineering and Geosciences) Contributor Rots, Jan (mentor) Messali, Francesco (mentor) Korswagen Eguren, Paul (mentor) Kasbergen, Cor (mentor) Degree granting institution Delft University of Technology Programme Civil Engineering Date 2018-11-30 Abstract The growing need to understand the behaviour of un-reinforced masonry URM), subjected torepeated light man-made earthquakes caused by the extraction of gas in the north-eastern partof The Netherlands has resulted in intense research to determine the exact process of crackinitiation and propagation. The historical masonry buildings and Dutch terraced houses inGroningen are prone to light damages which become severe upon repeated lateral earthquakeloading. Although there are material models that describe the behavior of modern brickmasonry, they do not accurately represent the mechanical properties of 19th century clay brickmasonry. This led to a large-scale research into the mechanical behavior of un-reinforcedmasonry and an orthotropic continuum macro-model called the Engineering Masonry Model(EMM) was proposed. The existing tension constitutive model in EMM assumes a secantunloading-reloading branch which does not consider the strength degradation of URM underrepeated loading. Since tension mode-I fracture results in cracking of URM, it is importantto study the effects of repeated loading on the propagation of the crack and its effects on thecapacity of the structure.This thesis presents a degradation model to represent the strength deterioration of URMobserved during repeated loading. The constitutive model formulated in this thesis is based onhyperbolic functions along with a secant slope for the unloading-reloading branch. To justifythe model assumptions, a single linear 4-node element is analysed with the new model and theeffect of varying different components of the constitutive equations is established. The windowbank spandrel sample modeled as a 4-point bending test is analysed using the new model for 10,30 and 100 repetitions. It is shown that the hyperbolic model can predict accurately the stressreduction within each repetition displacement set and also represent the crack width wideningand crack propagation accurately when compared to the experimental results. The new modelis tested on a wall with a window opening sample and the results closely matched that of theexperiment. Finally, recommendations are provided for further development of the hyperbolicmodel and calibration of the material properties. Subject Unreinforce masonry structuresDegradationengineering masonry modelDIANAFEM modellingTension mode-I To reference this document use: http://resolver.tudelft.nl/uuid:3c5dce16-f7c7-479f-80df-1bf141e0bf42 Part of collection Student theses Document type master thesis Rights © 2018 Srinidhi Bindiganavile Ramadas Files PDF MasterThesis_Srinidhi_4614216.pdf 11.13 MB Close viewer /islandora/object/uuid:3c5dce16-f7c7-479f-80df-1bf141e0bf42/datastream/OBJ/view