A Detailed Micro-modelling Approach for the Structural Analysis of Historical Masonry

摘要

Seismic assessment of unreinforced masonry structuresremains a challenge. This paper summarizes recentdevelopments of an advanced simulation method based onthe cohesive zone model (CZM) in a finite elementframework.Cohesive elements are often used to simulate dynamicfracture. To consider contact and friction, a new node-to-nodealgorithm is implemented in the open-source code Akantu,which offers a parallel computing model. Based on theproposed framework, two types of tests are investigated: theshear test, which is a basic material test to determineparameters such as the cohesion and friction coefficient, andthe diagonal compression test, which is a standard masonrymaterial test to determine the nominal diagonal tensilestrength and shear modulus of masonry. The simulationresults correspond well with experimental results.To represent and study the influence of the micro-structureof the stone masonry on the force-displacement behaviour, aversatile typology generator was developed. To furtherquantify the micro-structure of stone masonry typology, analgorithm to calculate the Line of Minimum Trace (LMT)automatically from pictures of masonry patterns wasdeveloped. Typical samples obtained from the masonrytypology generator are then simulated under compressionand shear-compression loading conditions and thecorrelation between the geometrical indexes and themasonry strengths evaluated.