scholarly journals Parametric Investigation on the Effectiveness of FRM-Retrofitting in Masonry Buttressed Arches

Buildings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 406
Author(s):  
Corrado Chisari ◽  
Daniela Cacace ◽  
Gianfranco De De Matteis
Keyword(s):  
Seismic Retrofitting ◽  
Collapse Mechanism ◽  
Seismic Capacity ◽  
Maximum Acceleration ◽  
Local Mechanism ◽  
Geometrical Features ◽  
Historical Masonry ◽  
Historical Heritage ◽  
Automatic Tool ◽  
Modelling Approach

Buttressed arches represent some of the most vulnerable elements in historical masonry buildings under seismic actions. Given their structural, architectural and often artistic importance, it is paramount to investigate effective retrofitting measures which satisfy reversibility and compatibility requirements for historical heritage. Among these, Fibre-Reinforced Mortar (FRM), characterised by enhanced ductility, has recently emerged in the scientific literature. In this paper, a numerical investigation aimed at exploring the effectiveness of this seismic retrofitting technique, when applied at intrados or extrados of various typologies of buttressed arches, is presented. An automatic tool for limit analysis is described and validated against a nonlinear Discrete Macro-Element modelling approach. This precedes an extensive parametric analysis, which has highlighted the effect of various geometrical features of the system on both collapse mechanism and maximum acceleration in the unreinforced configuration, and the high increase in seismic capacity provided by the retrofitting. This is particularly remarkable in case of local mechanism, i.e., wholly within the arch, in which case the FRM may be responsible of an overall shifting to a semi-global failure type.

scholarly journals Seismic Retrofitting for Masonry Historical Buildings

2016 ◽  
pp. 480-503
Author(s):  
Alberto Viskovic
Keyword(s):  
Design Process ◽  
Seismic Behavior ◽  
Masonry Structure ◽  
Seismic Retrofitting ◽  
Global Behavior ◽  
Masonry Buildings ◽  
Historical Buildings ◽  
Road Map ◽  
Historical Masonry ◽  
Related Design

The static and seismic retrofitting design, for masonry historical buildings, has to follow a right hierarchy of interventions, taking into account that to improve the seismic behavior of a masonry structure, it is necessary to guarantee a “closed box” behavior for the whole structural body or, in case of complex buildings, to guarantee a closed box behavior for each building's wing. Thus it is fundamental to distinguish the interventions for the global behavior improvement from those related to local reinforcements. In this chapter is then proposed a scheme of interventions hierarchy and, therefore, a related design process road-map together with the explanation of a correct design philosophy for the static and seismic retrofitting of historical masonry buildings. Moreover it is also reported an example of two distinguished levels of intervention, with numerical analyses supporting that solution.

scholarly journals General Perspectives on Seismic Retrofitting of Historical Masonry Structures

2017 ◽  
Author(s):  
Baris Sayin ◽  
Baris Yildizlar ◽  
Cemil Akcay ◽  
Tarik Serhat Bozkurt
Keyword(s):  
Seismic Retrofitting ◽  
Masonry Structures ◽  
Historical Masonry

scholarly journals Masonry Walls Retrofitted with Vertical FRP Rebars

Buildings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 72
Author(s):  
Simona Coccia ◽  
Fabio Di Carlo ◽  
Stefania Imperatore
Keyword(s):  
Ad Hoc ◽  
Masonry Wall ◽  
Seismic Retrofitting ◽  
Masonry Walls ◽  
Seismic Capacity ◽  
Seismic Behaviour ◽  
Safety Level ◽  
Dynamic Analyses ◽  
Out Of Plane ◽  
Vertical Bars

The out-of-plane behaviour of the walls as a consequence of an earthquake is the main vulnerability of existing masonry structures. In the case of rigid in compression not tensile resistant material, incremental dynamic analyses may be employed to evaluate the effective strength of a rocking element. When the seismic capacity of the wall is inadequate, retrofit interventions are required to assure an acceptable safety level. Conventional seismic retrofitting techniques on masonry walls influence the seismic performance of the element, which typically is modified in an out-of-plane bending behaviour. In this paper, analytical investigations are presented to investigate the possibility of a seismic retrofitting intervention able to increase the seismic strength of the wall without modifying its seismic behaviour. The analysed retrofitting technique consists in the application of composite vertical bars either in the middle section of the wall or at its external surfaces. The seismic behaviour of the retrofitted masonry wall is analytically evaluated by means of a parametric incremental dynamic analysis, carried out with an ad hoc in-house software. The effectiveness of the intervention is analysed in terms of level of seismic improvement, defined as the ratio between the seismic capacity of the reinforced and unreinforced walls.

Seismic retrofitting of the historical masonry structures using numerical approach

2016 ◽  
Vol 113 ◽  
pp. 752-763 ◽  
Author(s):  
Cemil Akcay ◽  
Tarik Serhat Bozkurt ◽  
Baris Sayin ◽  
Baris Yildizlar
Keyword(s):  
Numerical Approach ◽  
Seismic Retrofitting ◽  
Masonry Structures ◽  
Historical Masonry

Transmission Ratio Optimization of Electric Driven Palletizing Mechanism

2013 ◽  
Vol 371 ◽  
pp. 421-425
Author(s):  
Lucian Adrian Mihaila ◽  
Gheorghe Stan ◽  
Marian Funaru ◽  
Dragoș Andrioaia
Keyword(s):  
Equilibrium Equation ◽  
Transmission Ratio ◽  
Motor Shaft ◽  
Maximum Acceleration ◽  
Positioning Accuracy ◽  
High Productivity ◽  
Functional Parameters ◽  
Automatic Tool Changer ◽  
Automatic Tool ◽  
Ratio Optimization

One of the main objectives in obtaining high productivity on machining centers is the reduction of auxiliary times consumed with the tool and workpiece change. In the case of workpiece change the auxiliary time is reduced by adopting the use of an automatic pallet changer system and implicitly of pallets, while in the case of tool change this time is reduced using an automatic tool changer system. The optimization of the constructive and functional parameters of palletizing systems, in the purpose of decreasing auxiliary times, implies increased speed and accelerations, inertia reduction, an optimum transmission ratio, component mechanisms coupled movements, increasing the positioning accuracy of the pallet on the machine table. This paper presents the methodology of transmission ratio optimization of an electric driven pallet changer mechanism, the main purpose is to obtain the maximum acceleration. In order to find the maximum acceleration of the electric driven pallet changing mechanism considered, and thus minimizing the total changing time, we use the equilibrium equation of the moments reduced to the motor shaft. Following the proposed methodology we obtain the maximum acceleration of the considered pallet changer mechanism. Also we issue some constructive indications for future designing of electric driven pallet changer mechanisms.

scholarly journals Effect of Buttress Form on Transverse Seismic Resistance of High Masonry Walls

2021 ◽  
Author(s):  
M. Arif Gürel ◽  
Rabia İzol ◽  
Çağrı Mollamahmutoğlu ◽  
R. Kadir Pekgökgöz ◽  
F. Şebnem Kuloğlu Yüksel ◽  
...  
Keyword(s):  
Calculation Model ◽  
Nonlinear Static Analysis ◽  
Seismic Resistance ◽  
Masonry Walls ◽  
Analysis Method ◽  
Base Shear ◽  
Basic Model ◽  
Historical Masonry ◽  
Nonlinear Static ◽  
Modelling Approach

Abstract In historical masonry structures having vault, dome and high walls, for safety against gravity, wind and earthquake loads, buttresses are crucial elements. This study aims to investigate the effect of buttress form on the transverse seismic resistance of high masonry walls. For this purpose, a real historical masonry structure covered by a barrel vault, and has a simple and regular plan and elevation shape was considered. From a slice of this structure, a calculation model and a basic model were created. For the masonry, macro-modelling approach was used. Nonlinear static analysis method was adopted, and finite element modeling and calculations were carried out using the Abaqus program. Firstly, on the calculation model the effect of buttress depth on transverse seismic resistance was investigated, and it was seen that the resistance is almost linearly related to the buttress depth. Then, two groups of analyses were performed on the models obtained by mounting different buttress forms to the basic model. In the first group, the volumes of the buttresses were kept equal, and in the second group their base depths and thicknesses were taken equally. At the end of these analyses, by comparing the base shear forces obtained for the models, the effectiveness of buttress form on the transverse seismic resistance has been determined and evaluated. The results revealed that the model with curvilinear concave buttresses in the first group analyses and the model with semi-cylindrical buttresses in the second group analyses have the highest seismic resistance.

scholarly journals A Dissipating Frames for Seismic Retrofitting and Building Energy-Efficiency

2020 ◽  
Vol 5 (9) ◽  
pp. 74 ◽  
Author(s):  
Dora Foti ◽  
Francesco Ruggiero ◽  
Maria Francesca Sabbà ◽  
Michela Lerna
Keyword(s):  
Energy Efficiency ◽  
Control Process ◽  
Seismic Retrofitting ◽  
Building Energy Efficiency ◽  
Concrete Frames ◽  
Seismic Capacity ◽  
Precise Control ◽  
Earthquake Resistant ◽  
Aesthetic Results ◽  
The Aesthetic

In the present paper a new and innovative way to approach the regeneration of public buildings and public housing is proposed. It consists in a dissipative steel frame to reduce the displacement demand and to improve the energy efficiency of a real existing structure, inserting buckling-restrained axial dampers (BRAD) type dissipative braces. This system is adaptable to any construction made of reinforced concrete frames and improves energy efficiency and earthquake-resistant performance; moreover, it upgrades the aesthetics of buildings and the quality of life for the users. In fact, the system is capable of assuming different and pleasant architectural shapes offering benefits in terms of earthquake-resistant performance, energy saving, and energy production from renewable sources. The attention to the aesthetic results renders the intervention a redevelopment strategy not only on an architectural scale, but also in the urban contexts for degraded and marginalized suburbs. The performances of the proposed kit were evaluated on a case study consisting in a social house located in the south of Italy. Numerical analyses have been carried out and the results have been reported both from the seismic protection and energy efficiency points of view. As a result, the produced renewable energy from the retrofitting system and the building seismic capacity increased. A rapid and precise control process, able to return a suitable structural dimensioning of the frame, according to the different application contexts, is finally proposed.

Seismic Retrofitting for Masonry Historical Buildings

2015 ◽  
pp. 500-524
Author(s):  
Alberto Viskovic
Keyword(s):  
Design Process ◽  
Seismic Behavior ◽  
Masonry Structure ◽  
Seismic Retrofitting ◽  
Global Behavior ◽  
Masonry Buildings ◽  
Historical Buildings ◽  
Road Map ◽  
Historical Masonry ◽  
Related Design

The static and seismic retrofitting design, for masonry historical buildings, has to follow a right hierarchy of interventions, taking into account that to improve the seismic behavior of a masonry structure, it is necessary to guarantee a “closed box” behavior for the whole structural body or, in case of complex buildings, to guarantee a closed box behavior for each building's wing. Thus it is fundamental to distinguish the interventions for the global behavior improvement from those related to local reinforcements. In this chapter is then proposed a scheme of interventions hierarchy and, therefore, a related design process road-map together with the explanation of a correct design philosophy for the static and seismic retrofitting of historical masonry buildings. Moreover it is also reported an example of two distinguished levels of intervention, with numerical analyses supporting that solution.

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