1,720,972 research outputs found
Equivalent frame discretisation for URM façades with irregular opening layouts
No full textResearchers and practitioners widely employ simplified Equivalent Frame Models (EFM) for reproducing the in-plane governed response of unreinforced brick masonry (URM) structures, as they typically represent an acceptable compromise between numerical accuracy and computational cost. However, when considering URM structural systems with irregular opening distribution, the definition of the effective height and length of deformable components (i.e. pier and spandrel elements) still represents an open challenge. In this work, the influence of irregular distribution of openings on the predicted lateral response of full-scale URM façades was investigated. To this end, several geometrical combinations characterised by various degrees of irregularity were considered and idealised according to commonly employed EF discretisation approaches. Then, after a preliminary calibration process against experimental tests on both individual piers and a full-scale building façade, EFM results were compared with micro-modelling predictions, carried out within the framework of the Applied Element Method and used as a benchmark. Although in specific irregular configurations using some discretisation approaches, macro and micro-models converge to similar results, non-negligible differences in terms of initial lateral stiffness, base-shear and damage distribution were observed with other EF schemes or opening layouts, thus indicating that a careful selection of appropriate criteria is indeed needed when performing in-plane analyses of URM systems with irregular opening distributions. Finally, building on inferred simulated data, potential solutions are given to overcome typical EF discretisation issues and better approximate micro-modelling outcomes
ANALISI DELLE VARIAZIONI DI PH DI ALCUNI CEMENTI UTILIZZATI PER LA STABILIZZAZIONE TEMPORANEA DEI MANUFATTI PROTESICI
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Influence of various light timber retrofit layouts on the dynamic response of typical Dutch masonry terraced houses
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Extending Analysis Capabilities of Equivalent Frame Models for Masonry Structures
No full textThe equivalent frame modeling of masonry buildings is widely used if not a real standard for the nonlinear seismic analysis of masonry buildings. Originally created to represent the in-plane behavior of the walls in the plan, it was subsequently applied for the analysis of three-dimensional models of entire buildings. In current standards and also in the new draft of Eurocode 8 this modeling technique retains a key role for the analysis of masonry structures. Recent developments and applications reflect the analysis capabilities subsequently added to this modeling technique, often derived after calibration with experimental results and/or detailed numerical models. They include pushover and time-history analysis features, inclusion of strength and stiffness contributions of the out-of-plane response of walls and floor/roof diaphragms, discretization of walls with irregular opening distributions, modelling strategies applicable to complex buildings with flexible diaphragms
A multivariate re-examination of experimental condition effects on acyloin-type condensation mediated by Saccaromyces cerevisiae.
No full textCollapse analysis of URM cavity-wall buildings with different ground floor opening layouts
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