000013700 001__ 13700
000013700 005__ 20161114170252.0
000013700 04107 $$aeng
000013700 046__ $$k2011-05-25
000013700 100__ $$aCasolo, S.
000013700 24500 $$aSeismic Vulnerability Assessment of Masonry Towers: Full Non-Linear Dynamics Vs Pushover Analyses

000013700 24630 $$n3.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013700 260__ $$bNational Technical University of Athens, 2011
000013700 506__ $$arestricted
000013700 520__ $$2eng$$aThe paper concerns the seismic vulnerability assessment of masonry bell towers in Italy, which is performed by comparing full non-linear dynamic analysis and non-linear static analysis. An idealized case study is considered, in order to assess some basic and common features of the seismic structural response and to appraise the performance of the proposed approach. The reference model is supposed to be structurally independent, i.e. with no adjacent interacting construction. The geometrical dimensions are chosen in order to represent an average north-Italian masonry bell tower, without the intent to cover all the possible situations. The seismic response of these structures involves a coupling between flexural and axial vibration modes, the presence of shear damage patterns, and high vibration modes causing the belfry collapse. The problem is simplified by using a plane 2D scheme. A specific Rigid Body and Spring Model is adopted to describe the in-plane dynamics. Constitutive laws were assigned following a simplified heuristic approach including the main meso–scale damage mechanisms: i) very low tensile strength; ii) significant post-elastic orthotropy plus texture effects; iii) different rules for post-elastic axial and shear damage; iv) different dependence of the shear strength on the vertical and horizontal axial stress component; v) hysteretic energy dissipation due to cyclic loading. Even using a quite coarse mesh, the model is capable to describe the higher vibration modes with a reasonable computational effort and using realistic accelerograms. Non linear static analysis was performed, by using the RBSM model, obtaining the capacity curve and assessing the seismic demand. A comparison between the two approaches is proposed, in order to appraise the difference in the results and to evaluate quality and significance of results in terms of operational drawbacks and reduction of computational times. Particular attention is devoted to the fact that static non-linear analyses tends to neglect the damage effects induced by higher vibration modes, as well as the influence of the shear response on the global damage.

000013700 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013700 653__ $$aMasonry towers, Belfry, RBSM, Pushover Analysis, Nonlinear Dynamic Analysis.

000013700 7112_ $$aCOMPDYN 2011 - 3rd International Thematic Conference$$cIsland of Corfu (GR)$$d2011-05-25 / 2011-05-28$$gCOMPDYN2011
000013700 720__ $$aCasolo, S.$$iUva, G.
000013700 8560_ $$ffischerc@itam.cas.cz
000013700 8564_ $$s4650931$$uhttps://invenio.itam.cas.cz/record/13700/files/541.pdf$$yOriginal version of the author's contribution as presented on CD, section: MS 24 Seismic Assessment of Heritage Structures and Monuments Through Simulation.
000013700 962__ $$r13401
000013700 980__ $$aPAPER