A new experimental approach for small-scale dynamic tests on masonry arches aimed at seismic assessment

2022 ◽  
Vol 7 (1/2) ◽  
pp. 89
Author(s):  
Anna Castellano ◽  
Isabella Elia ◽  
Aguinaldo Fraddosio ◽  
Carlo Olivieri ◽  
Mario Daniele Piccioni
Author(s):  
Mario Daniele Piccioni ◽  
Carlo Olivieri ◽  
Aguinaldo Fraddosio ◽  
Anna Castellano ◽  
Isabella Elia

2014 ◽  
Vol 136 (9) ◽  
Author(s):  
James F. Wilson

The principles of similitude were employed to scale the equations of motion of wood utility poles to small, practical laboratory size. The derived dimensionless system parameters were used to design experiments in which model pole bending moments at failure were measured in response to simulated steady and gusting wind loads. Measured were the effects of artificial flaws on a pole's integrity under these loads, with flaws represented as radial holes. Modeled in static and dynamic tests to failure were shallow pole holes at the base designed to deliver termite and rot control chemicals in a prototype; shallow holes to simulate loose knots and through holes needed for utility hardware attachments. The groundline moment data for both static and dynamic tests showed either shear or tensile failure. An application illustrates the use of small-scale model data to explain the wind-induced base failure of a generic prototype utility pole.


2011 ◽  
Vol 3 (6) ◽  
pp. 897-913 ◽  
Author(s):  
Louise S. L. Teh ◽  
Lydia C. L. Teh ◽  
U. Rashid Sumaila

Understanding the socio-economic factors that are associated with fishers’ willingness to delay gratification may be useful for designing appropriate fisheries management and conservation policies. We aim to identify the predictors of low discounting behaviour among fishers, which is analogous to having a longer-term outlook. We base our empirical study on two small-scale tropical reef fisheries in Sabah, Malaysia, and Fiji. We use an experimental approach to identify fishers with low discount rates, and then use a logistic regression model to identify predictors of low discount rates. We find that 42% of the respondents have low discount rates, and that site and village level variables are significant predictors of low discount rates. Within Sabah and Fiji, boat ownership and relative catch differentiate low discounting from non-low discounting fishers, but these variables have contradictory effects in Sabah and Fiji. Overall, our results imply that a substantial proportion of reef fishers may be willing to engage in conservation initiatives; however, local socio-cultural, economic, and ecological conditions have to be considered first during the process of designing management interventions.


2008 ◽  
Vol 80 (24) ◽  
pp. 9517-9525 ◽  
Author(s):  
Melissa R. Thompson ◽  
Karuna Chourey ◽  
Jennifer M. Froelich ◽  
Brian K. Erickson ◽  
Nathan C. VerBerkmoes ◽  
...  

Buildings ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 151 ◽  
Author(s):  
João Estêvão

The selection of a given method for the seismic vulnerability assessment of buildings is mostly dependent on the scale of the analysis. Results obtained in large-scale studies are usually less accurate than the ones obtained in small-scale studies. In this paper a study about the feasibility of using Artificial Neural Networks (ANNs) to carry out fast and accurate large-scale seismic vulnerability studies has been presented. In the proposed approach, an ANN was used to obtain a simplified capacity curve of a building typology, in order to use the N2 method to assess the structural seismic behaviour, as presented in the Annex B of the Eurocode 8. Aiming to study the accuracy of the proposed approach, two ANNs with equal architectures were trained with a different number of vectors, trying to evaluate the ANN capacity to achieve good results in domains of the problem which are not well represented by the training vectors. The case study presented in this work allowed the conclusion that the ANN precision is very dependent on the amount of data used to train the ANN and demonstrated that it is possible to use ANN to obtain simplified capacity curves for seismic assessment purposes with high precision.


Oecologia ◽  
2000 ◽  
Vol 122 (3) ◽  
pp. 389-398 ◽  
Author(s):  
D. Raffaelli ◽  
S. Hall ◽  
C. Emes ◽  
B. Manly

2019 ◽  
Vol 817 ◽  
pp. 285-292 ◽  
Author(s):  
Anna Castellano ◽  
Aguinaldo Fraddosio ◽  
Jacopo Scacco ◽  
Gabriele Milani ◽  
Mario Daniele Piccioni

The problem of the dynamic behavior of masonry arches and vaults has gained increasing interest in recent years, since the key role of these structural elements in the masonry constructions, especially of historic interest. Despite this, the literature still lacks a sufficiently large number of contributions on this important subject, and this deficiency is even more marked for the case of reinforced masonry. In this context, the present paper shows and discusses some preliminary experimental results on full-scale dynamic tests on unreinforced and GFRCM-reinforced Apulian tuff masonry arches. The experiments have been performed by using a test bench appositely designed and built; the dynamic excitation consisted of a harmonic base motion with fixed amplitude and increasing frequency. The acceleration in suitable points of the arches, the base shear and the base motion have been continuously monitored during the tests.


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