Influence of shear modulus and drift capacity on non-linear static analysis of masonry buildings

2019 ◽  
Author(s):  
Maria Luisa Beconcini ◽  
Paolo Cioni ◽  
Pietro Croce ◽  
Paolo Formichi ◽  
Filippo Landi ◽  
...  
Keyword(s):  
Shear Modulus ◽  
Static Analysis ◽  
Seismic Performance ◽  
Nonlinear Static Analysis ◽  
Masonry Buildings ◽  
Drift Capacity ◽  
Linear Resistance ◽  
Non Linear ◽  
Definition Of

<p>In nonlinear static analysis of masonry buildings, the hysteric behaviour of masonry walls is commonly idealized through a bi-linear resistance envelope defined by the lateral stiffness of the wall, the ultimate shear resistance and the ultimate inter-storey drift. Therefore, it becomes fundamental to properly set the modulus of elasticity and shear modulus for masonry as well as to properly evaluate the drift capacity of the walls.</p><p>In the paper, the combined influence of shear modulus and drift capacity definition on the assessment of seismic performance of masonry buildings is investigated in details by means of a simplified non-linear pushover type algorithm developed by the authors. In particular, two different definitions are considered for the drift capacity, in terms of ductility and in terms of percentage of the inter-storey height, while for the shear modulus a reasonable set of values is investigated according a database collected combining masonry test results available in the relevant scientific literature with an in situ experimental campaign carried out by the authors.</p><p>The results show how the variation in shear modulus can lead to conflicting outcomes for the evaluation of seismic performance of masonry buildings depending on the assumed definition of drift capacity.</p>

scholarly journals Influence of mechanical parameters on non-linear static analysis of masonry buildings: a relevant case-study

2018 ◽  
Vol 11 ◽  
pp. 331-338 ◽  
Author(s):  
Pietro Croce ◽  
Maria Luisa Beconcini ◽  
Paolo Formichi ◽  
Paolo Cioni ◽  
Filippo Landi ◽  
...  
Keyword(s):  
Static Analysis ◽  
Masonry Buildings ◽  
Mechanical Parameters ◽  
Relevant Case ◽  
Non Linear ◽  
Linear Static Analysis

Seismic risk evaluation of existing masonry buildings: methods and uncertainties

2019 ◽  
Author(s):  
Pietro Croce ◽  
Maria Luisa Beconcini ◽  
Paolo Formichi ◽  
Filippo Landi ◽  
Benedetta Puccini ◽  
...  
Keyword(s):  
Seismic Risk ◽  
Ad Hoc ◽  
Risk Index ◽  
Critical Issue ◽  
Masonry Building ◽  
Masonry Buildings ◽  
Non Linear ◽  
Static Approach ◽  
Definition Of

<p>Masonry structures represent a large part of existing buildings. As confirmed by the damage caused by recent seismic events, the assessment of seismic performance of existing masonry building is then a critical issue in Countries exposed to seismic risk. Moreover, common methods of analysis based on non-linear static approach are significantly influenced by the assumptions about the shear behavior of masonry walls and may lead to inconsistent or contradictory results.</p><p>Due to the relevance of the problem ad hoc studies have been performed to clarify how the most relevant parameters affect the theoretical structural behavior and to setup a proper method to define these parameters.</p><p>In the paper, the main sources of uncertainties regarding the definition of material parameters are investigated and a methodology for the identification of masonry classes is illustrated discussing the propagation of uncertainties related to masonry parameters in non-linear static analysis of masonry buildings. The analysis are carried out through a simplified non-linear pushover type algorithm developed by the authors and the outcomes are illustrated and critically discussed for a relevant case study.</p><p>The results show the capability of the proposed procedure for the identification of masonry classes and the evaluation of masonry mechanical parameters to provide a more refined probabilistic assessment of the seismic risk index.</p>

Seismic Performance Evolution of Tube-in-Tube Diagrid Structure Using Non Linear Static Analysis

2021 ◽  
Vol 6 (3) ◽  
Author(s):  
M. K. Laghate ◽  
M. K. Laghate
Keyword(s):  
Static Analysis ◽  
Seismic Performance ◽  
Lateral Displacement ◽  
Pushover Analysis ◽  
Lateral Load ◽  
High Rise ◽  
Load Carrying ◽  
Non Linear ◽  
Diagrid Structure ◽  
Linear Static Analysis

Diagrid structures are evolved as one of the best structural system for high rise buildings. In this study seismic performance of 36 stories Tube-in-Tube Diagrid Structure with various diagonal slopes is evaluated by Non Linear Static Analysis. Tube-in-Tube diagrid structures are modified Diagrid structures in which gravity core is replaced with Diagrid core. Single tube diagrid structure is also studied for comparison. The structure is pushed gradually proportional to fundamental Mode shape. The analysis results shows that Tube-in-Tube structure possess higher stiffness and Lateral Load resisting capacity. The pushover analysis demonstrates that diagrid core can perform better by hardening the structure. According to analysis results, the Tube-in-Tube diagrid structure shows higher non-linear lateral displacement. It was observed that as the diagrid angle increases the stiffness and lateral load carrying strength decreases.

scholarly journals Sensitivity Assessment of the Seismic Response of a Masonry Palace via Non-Linear Static Analysis: A Case Study in L’Aquila (Italy)

2021 ◽  
Vol 6 (1) ◽  
pp. 8
Author(s):  
Ilaria Capanna ◽  
Angelo Aloisio ◽  
Franco Di Fabio ◽  
Massimo Fragiacomo
Keyword(s):  
Mechanical Properties ◽  
Seismic Response ◽  
Static Analysis ◽  
20Th Century ◽  
Seismic Performance ◽  
Mechanical Resistance ◽  
13Th Century ◽  
Sensitivity Assessment ◽  
Non Linear ◽  
Linear Static Analysis

The city of L’Aquila (Italy) includes a significant amount of masonry palaces erected from the middle of the 13th century up to the first half of the 20th century. This paper focuses on the seismic response of a masonry palace built during the first half of the 20th century and characterized by regularity in plan and elevation. The authors investigate the seismic response by varying a suite of modelling parameters that express the actual scatter of the mechanical properties typical of the masonry palaces erected in L’Aquila. The authors discuss the seismic performance exhibited by this building during the 2009 earthquake. Then, they assess the sensitivity of the selected building’s seismic performance via non-linear static analysis to the mechanical properties of masonry, the in-plane stiffness of the floors, and the mechanical resistance of the spandrels. The parametric analysis shows that the three variables markedly affect the shear resistance, the ultimate displacement, and the behavior factors. The fragility functions were then estimated from the results of non-linear static analysis. A significant scatter of the probability of collapse for the considered limit states reveals the limitations of typological approaches for masonry palaces.

scholarly journals Probabilistic Seismic Assessment of Existing Masonry Buildings

Buildings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 237 ◽  
Author(s):  
Pietro Croce ◽  
Filippo Landi ◽  
Paolo Formichi
Keyword(s):  
Seismic Performance ◽  
Seismic Risk ◽  
Seismic Vulnerability ◽  
Risk Index ◽  
Critical Issue ◽  
Response Surfaces ◽  
Masonry Buildings ◽  
Risk Indices ◽  
Non Linear ◽  
Probabilistic Seismic Assessment

The evaluation of seismic performance of existing masonry buildings is a critical issue in assessing the seismic vulnerability of the built environment. With this aim, non-linear static analysis is commonly used, but results are influenced significantly by the collapse criteria adopted, as well as by the assumptions about material properties and drift capacity of masonry walls. A methodology for the probabilistic assessment of the seismic risk index is proposed by means of an original non-linear pushover type algorithm developed by the authors. The main sources of uncertainties related to masonry parameters and their influence on seismic risk indices are identified by means of sensitivity analysis. Response surfaces for the seismic risk indices are thus defined through general polynomial chaos expansion in order to quantify the uncertainties in the resulting seismic risk index. Finally, a seismic performance classification is presented to help stakeholders to manage risks and define priorities for seismic retrofit. The methodology together with the outcomes is illustrated for a set of existing masonry buildings that are part of the school system in the Municipality of Florence.

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