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Tiago M. Ferreira,Romeu Vicente,Humberto Varum 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.50 No.4
This paper approaches the issue of seismic vulnerability assessment strategies for facade walls of traditional masonry buildings through the development of a methodology and its subsequent application to over 600 building facades from the old building stock of the historic city centre of Coimbra. Using the post-earthquake damage assessment of masonry buildings in L'Aquila, Italy, an analytical function was developed and calibrated to estimate the mean damage grade for masonry facade walls. Having defined the vulnerability function for facade walls, damage scenarios were calculated and subsequently used in the development of an emergency planning tool and in the elaboration of an access route proposal for the case study of the historic city centre of Coimbra. Finally, the methodology was pre-validated through the comparison of a set of results obtained from its application and also resourcing to a widely accepted mechanical method on the description of the out-of-plane behaviour of facade walls.
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Buckling Uncertainty Analysis for Steel Pipelines Buried in Elastic Soil Using FOSM and MCS Methods
Allaeddine Athmani,Asma Khemis,Abdelmadjid Hacene Chaouche,Kong Fah Tee,Tiago Miguel Ferreira,Romeu Vicente 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.2
Generally, buried steel pipes are designed for good transverse behavior by neglecting soil–structure interaction eff ect. Steel pipelines are also usually designed to prevent from the important failure mode of buckling. However, the design of this type of structures does not normally consider the uncertainties in soil and structural properties. To address the above issues, the paper estimates the uncertainties in terms of the coeffi cient of variation of critical buckling displacement, CV w using subgrade reaction theory (Winkler model) and fi rst-order second-moment (FOSM) method. Two cases of boundary conditions have been considered in this study. In the fi rst case, CV w is calculated within an infi nitely thick soil as a function of uncertainty of subgrade reaction modulus ( K s ). In the second case, CV w is calculated in a thick soil cylinder as a function of the uncertainty of the eff ective subgrade reaction modulus ( K′ S ). Furthermore, the uncertainty of pipe fl exibility ( S f ) is also taken into account in the two cases. Uncertainty calculations by the FOSM method are then validated with those obtained from traditional Monte Carlo simulations.
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