AUTOMATIC ASSESSMENT OF PARTIAL FAILURE MECHANISMS IN RETROFITTED HISTORICAL MASONRY AGGREGATES THROUGH ADAPTIVE NURBS LIMIT ANALYSIS

2020 ◽  
Author(s):  
Nicola Grillanda ◽  
Marco Valente ◽  
Gabriele Milani
Keyword(s):  
Limit Analysis ◽  
Failure Mechanisms ◽  
Automatic Assessment ◽  
Partial Failure ◽  
Historical Masonry

Seismic Risk Mitigation of Historical Masonry Towers by Means of Prestressing Devices

2010 ◽  
Vol 133-134 ◽  
pp. 843-848 ◽  
Author(s):  
Adolfo Preciado Quiroz ◽  
Silvio T. Sperbeck ◽  
Harald Budelmann ◽  
Gianni Bartoli ◽  
Elham Bazrafshan
Keyword(s):  
Seismic Risk ◽  
Seismic Vulnerability ◽  
Risk Mitigation ◽  
Numerical Models ◽  
Failure Mechanisms ◽  
Masonry Towers ◽  
Seismic Risk Mitigation ◽  
Historical Masonry ◽  
Observed Damage ◽  
And Behavior

This work presents the investigation of the efficiency of different prestressing devices as a rehabilitation measure for the seismic risk mitigation of historical masonry towers. As a first phase, the seismic vulnerability of theoretical masonry towers was assessed by means of numerical models validated with information from the literature, observed damage and behavior of these structures due to passed earthquakes (crack pattern and failure mechanisms), and mainly taking into account the engineering experience. Afterwards, the validated models were rehabilitated with different prestressing devices; analyzing the results and concluding which device or the combination of them improved in a better way the seismic performance of the masonry towers. Finally, the methodology will be applied in two historical masonry towers located in seismic areas; the medieval tower “Torre Grossa” of San Gimignano, Italy, and one of the bell towers of the Cathedral of Colima, Mexico.

scholarly journals Consolidation and Strengthening of Historical Masonry by Means of Mineral Grouts: Grout Development

2015 ◽  
Vol 21 (1) ◽  
pp. 29-45 ◽  
Author(s):  
Dionys Van Gemert ◽  
Sven Ignoul ◽  
Kris Brosens ◽  
Eleni-Eva Toumbakari
Keyword(s):  
Failure Mechanisms ◽  
Brick Masonry ◽  
Historical Overview ◽  
Advantages And Disadvantages ◽  
Crack Repair ◽  
Historical Masonry

Abstract: Mass consolidation of stone and brick masonry is considered, with exclusion of pure crack repair. Damage and specific failure mechanisms in multiple leaf masonry are presented. The aims of consolidation are explained, and the inherent advantages and disadvantages of distinct strengthening and consolidation techniques are given. An historical overview of consolidation methods and of development of consolidation grout materials is given, which explains how technology evolved to the actual procedures.

Seismic Safety Assessment of the “Tekyeh Amir Chakhmagh” by Simplified Kinematic Limit Analysis

2010 ◽  
Vol 133-134 ◽  
pp. 653-658
Author(s):  
Seyed Rohollah Pashanejati ◽  
Climent Molins
Keyword(s):  
Limit Analysis ◽  
Safety Assessment ◽  
Failure Mechanisms ◽  
Three Dimensional ◽  
Masonry Buildings ◽  
Seismic Safety ◽  
Early 19Th Century ◽  
Analysis And Design ◽  
Macro Block ◽  
Kinematic Limit

This paper presents an investigation about the capabilities of simplified kinematic limit analysis for the safety evaluation and for the design of strengthening of masonry historical buildings. Limit analysis allows, with a reduced number of mechanical properties and for a given ultimate condition of the structure, affordable safety analysis and design of strengthening to the practitioners. Masonry buildings subjected to earthquake show in most cases local failure mechanisms rather than global failure mechanisms due to the lack of integrity of structure. For this reason, simplified kinematic limit analysis has been accepted as a method to design the strengthening of masonry buildings, according to the Italian Ordinance (O.P.C.M. 3431). To validate the applicability of this method, its results had been compared with those provided by three dimensional macro block limit analysis (Bustamante, 2003) for the Via Arizzi house. It is worth noting that results of simplified kinematic limit analysis provided similar results as those achieved by 3D macro block. Also this method was implemented to seismic safety assessment of Tekyeh Amir Chakhmagh in Iran based on the results obtained for the out of plane and in plane behaviour of walls. Tekyeh Amir Chakhmagh is an early 19th century tiled edifice that was built to serve as grand-stand for watching religious rites and also provided an imposing entrance to Amir Chakhmagh bazaar. This stunning three-story facade of the building is one of the most recognizable and unusual buildings in Iran.

scholarly journals Numerical and Experimental Analysis of Full Scale Arches Reinforced with GFRP Materials

2014 ◽  
Vol 624 ◽  
pp. 502-509 ◽  
Author(s):  
Ismael Basilio ◽  
Roberto Fedele ◽  
Paulo B. Lourenço ◽  
Gabriele Milani
Keyword(s):  
Upper Bound ◽  
Limit Analysis ◽  
Experimental Analysis ◽  
Failure Mechanisms ◽  
Peak Load ◽  
Numerical Results ◽  
Masonry Arches ◽  
Reinforced Masonry ◽  
The University

In this contribution, original limit analysis numerical results are presented dealing with some reinforced masonry arches tested at the University of Minho-UMinho, PT. Twelve in-scale circular masonry arches were considered, reinforced in various ways at the intrados or at the extrados. GFRP reinforcements were applied either on undamaged or on previously damaged elements, in order to assess the role of external reinforcements even in repairing interventions. The experimental results were critically discussed at the light of limit analysis predictions, based on a 3D FE heterogeneous upper bound approach. Satisfactory agreement was found between experimental evidences and the numerical results, in terms of failure mechanisms and peak load.

M-N Interaction Effect on the Frames Failure Mechanisms

2016 ◽  
Vol 847 ◽  
pp. 248-256 ◽  
Author(s):  
Giuseppe Buonocore ◽  
Antonio Gesualdo ◽  
Antonino Iannuzzo ◽  
Mariano Modano ◽  
Michela Monaco ◽  
...  
Keyword(s):  
Limit Analysis ◽  
Safety Assessment ◽  
Ultimate Load ◽  
Failure Mechanisms ◽  
Bending Moment ◽  
Significant Parameter ◽  
Economical Design ◽  
Computationally Expensive ◽  
Idealised Model ◽  
Careful Assessment

The collapse factor is a significant parameter in the framework of the safety assessment and economical design of ductile structures. This fact draws attention to the necessity of a careful assessment of the limit analysis approaches. The kinematics in these structures arises in fact from the actual rotation of the plastic hinges under axial force and bending moment. It can be shown that it is possible to obtain a reliable tool capable of competing with computationally expensive methodologies. The application of the methods of limit analysis involves a simplified and idealised model of the structure and, notwithstanding the fact that hundreds of papers have been devoted to the topic, some consequences of apparently unimportant simplifications still seem to have not been properly and firmly highlighted. This paper investigates the ultimate load and collapse modes of steel frames under combined vertical and horizontal forces through limit analysis.

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