Stress state analysis of calcium silicate hollow block masonry under compression

Robertas Zavalis

Doctoral dissertation

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Analysis of compressed calcium silicate hollow block masonry stress and deformations state under short term load is presented in this thesis. Main objective of the thesis is to analyse influence of bed joints on masonry stress deformations state under compression by applying the numerical modelling method and experimental research.

The thesis consists of an introduction, three main chapters, the results and conclusions and a list of references.

The introduction describes the major objective of the thesis. It presents the aims, the methods of research, the scientific novelty and defended propositions.

The first chapter reviews stress and deformation state of masonry under brief static load. Various factors that are affecting behaviour of masonry are described. The influence of mentioned factors on masonry compression strength and deformation properties is analysed. The adaptation of numerical methods for masonry modelling is described. An overview of the main principles of modelling methods and fracture criteria applied to numerical modelling of masonry is made.

Experimental masonry components, masonry research, and research results are described in the second chapter. Masonry components (mortar, masonry units), samples and their preparation, as well as methodology of performed research are described. Hollow calcium silicate block masonry samples’ research results are presented, and effect of different factors on mechanical properties of masonry is analysed.

Experimental research results and results of numerical modelling and analytic masonry and masonry units’ mechanical property calculation methods are compered in the third chapter. Generalised bed joint Young’s modulus is determined. Its calculation formula is suggested. Generalised bed joint Young’s modulus is tailored to hollow calcium silicate block compressive masonry deformational properties’ analysis by employing analytical formulas and applying detailed numerical micro-modelling. Recommendations for mechanical properties determining specification in accordance with LST EN 1996-1-1were provided.

At the end presented general results and conclusions.

Four articles focusing on the subject of the thesis are published, three of which presented in reviewed scientific periodical publications and one in international conference proceedings. The results of thesis were announced in two republican conferences and two international conferences.

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145×205 mm
136 p.
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