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A platform for research: civil engineering, architecture and urbanism
Seismic strengthening of slender masonry barrel vaults: experimental behaviour and analytical modelling
The Ph.D. thesis starts from a vulnerability study at regional level. This analysis on a typical historical centre located in the Italian region has been performed. This is a preliminary study in order to assess the main parameters which cause vulnerabilities. The result remarks the influence of local mechanisms in the existing masonry buildings, when there are thrusting elements. For this reason, a structural assessment of masonry vaults, by using a detailed modelling, has been performed. The work focuses on a particular typology of barrel vaults typically used as roofs in religious buildings. These vaults typically do not include any backfill and are slender. These barrel vaults cannot be analysed through the classical approaches where no-tensile strength is assumed. The tensile strength must be included to assess the seismic capacity. Therefore a simplified analytical model, in the framework of limit analysis, is proposed which includes the tensile strength. Tensile strength in these analyses is not only affected by the strength of basic materials, but also by the bond at the unit-to-joint interfaces, which could be rather difficult to assess reliably. The proposed model is useful to have simplified calculations to estimate the increase in capacity of vaulted masonry due to the strengthening interventions. The validation of the analytical model was provided by comparing predictions of the load capacity and the failure mode with those obtained from shaking table tests. The dynamic test used to validate the analytical model has been performed on a full scale masonry vault, previously tested. Starting from the validation of the proposed analytical model, sensitivity analyses have been performed in order to assess the impact of some mechanical and geometrical parameters on the seismic capacity. These analyses were performed using the proposed analytical model. Furthermore, the model, previously validated, has been used in order to design dynamic tests on another masonry vault. The proposed method represents a ...
Seismic strengthening of slender masonry barrel vaults: experimental behaviour and analytical modelling
The Ph.D. thesis starts from a vulnerability study at regional level. This analysis on a typical historical centre located in the Italian region has been performed. This is a preliminary study in order to assess the main parameters which cause vulnerabilities. The result remarks the influence of local mechanisms in the existing masonry buildings, when there are thrusting elements. For this reason, a structural assessment of masonry vaults, by using a detailed modelling, has been performed. The work focuses on a particular typology of barrel vaults typically used as roofs in religious buildings. These vaults typically do not include any backfill and are slender. These barrel vaults cannot be analysed through the classical approaches where no-tensile strength is assumed. The tensile strength must be included to assess the seismic capacity. Therefore a simplified analytical model, in the framework of limit analysis, is proposed which includes the tensile strength. Tensile strength in these analyses is not only affected by the strength of basic materials, but also by the bond at the unit-to-joint interfaces, which could be rather difficult to assess reliably. The proposed model is useful to have simplified calculations to estimate the increase in capacity of vaulted masonry due to the strengthening interventions. The validation of the analytical model was provided by comparing predictions of the load capacity and the failure mode with those obtained from shaking table tests. The dynamic test used to validate the analytical model has been performed on a full scale masonry vault, previously tested. Starting from the validation of the proposed analytical model, sensitivity analyses have been performed in order to assess the impact of some mechanical and geometrical parameters on the seismic capacity. These analyses were performed using the proposed analytical model. Furthermore, the model, previously validated, has been used in order to design dynamic tests on another masonry vault. The proposed method represents a ...
Seismic strengthening of slender masonry barrel vaults: experimental behaviour and analytical modelling
Ramaglia, Giancarlo (author)
2016-03-31
Ramaglia, Giancarlo (2016) Seismic strengthening of slender masonry barrel vaults: experimental behaviour and analytical modelling. [Tesi di dottorato]
Theses
Electronic Resource
Italian , English
DDC:
624
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