slovenski

Neelastično strižno obnašanje armiranobetonskih sten pri potresnem vplivu

The main contribution of the Ph. D. thesis consists in the development of an original analytical model for the inelastic shear behaviour of reinforced concrete walls under seismic conditions. A wide review of literature, which consists of experimental results and mathematical models representing seismic behaviour of reinforced concrete (RC) elements, was made in order to identify the shear deformation and load transfer mechanisms in RC walls. The findings were utilized for the development of a new analytical model, which is based on the multi-vertical-line-element-model (MVLEM). The MVLEM was upgraded by adding multiple horizontal springs representing shear behaviour, which were linked to the displacements in vertical springs. Thus the interconnection between axial, flexural and shear behaviour was achieved. The constitutive rules for horizontal springs were set according to the mathematical models of shear transfer mechanisms found in the literature. The new element was implemented into up-to-date software for seismic analyses of buildings OpenSees. The experimental results of a large scale wall specimen tested on shake table were used in order to verify the reliability of the element. Further, the new element was utilised for a probabilistic study to assess the seismic risk of exemplar RC walls. Parallel to the main task, a critical review of Eurocode 8 procedures for determining the seismic shear demand in RC walls was made. The sources of shear magnification in RC walls, which must be accounted in the seismic design, were investigated. The results of a large parametric study demonstrated that the valid Eurocode 8 procedure needs some corrections, thus an enhanced procedure was proposed.

armiranobetonske stene; neelastično strižno obnašanje AB elementov;

Voditelj projekta je bio komentor i sudjelovao je u povjerenstvu za obranu rada.