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Author Fierro, R.; Leiva, V.
Title A stochastic methodology for risk assessment of a large earthquake when a long time has elapsed Type
Year 2017 Publication Stochastic Environmental Research And Risk Assessment Abbreviated Journal Stoch. Environ. Res. Risk Assess.
Volume 31 Issue 9 Pages 2327-2336
Keywords Earthquake data analysis; Exponential and gamma distributions; Maximum-likelihood method; Monte Carlo simulation; Nonhomogeneous Poisson process
Abstract We propose a stochastic methodology for risk assessment of a large earthquake when a long time has elapsed from the last large seismic event. We state an approximate probability distribution for the occurrence time of the next large earthquake, by knowing that the last large seismic event occurred a long time ago. We prove that, under reasonable conditions, such a distribution is exponential with a rate depending on the asymptotic slope of the cumulative intensity function corresponding to a nonhomogeneous Poisson process. As it is not possible to obtain an empirical cumulative distribution function of the waiting time for the next large earthquake, an estimator of its cumulative distribution function based on existing data is derived. We conduct a simulation study for detecting scenario in which the proposed methodology would perform well. Finally, a real-world data analysis is carried out to illustrate its potential applications, including a homogeneity test for the times between earthquakes.
Address [Fierro, Raul] Univ Valparaiso, Inst Matemat, Valparaiso, Chile, Email: victorleivasanchez@gmail.com
Corporate Author Thesis
Publisher Springer Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1436-3240 ISBN Medium
Area Expedition Conference
Notes WOS:000414782800011 Approved
Call Number UAI @ eduardo.moreno @ Serial 796
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Author Parra, P.F.; Moehle, J.P.
Title Stability of Slender Wall Boundaries Subjected to Earthquake Loading Type
Year 2017 Publication Aci Structural Journal Abbreviated Journal ACI Struct. J.
Volume 114 Issue 6 Pages 1627-1636
Keywords buckling; earthquake; reinforced concrete; slenderness; wall boundary element
Abstract Global instability of slender reinforced concrete walls occurs when the concrete section buckles out-of-plane over a portion of the wall length and height. Theoretical and numerical analyses were conducted on axially loaded prismatic members to evaluate the onset of global instability under tension/compression load cycles. A buckling theory suitable for hand calculations is introduced and evaluated using data available in the literature from tests conducted on columns. Computer simulations using force-based nonlinear elements with fibers are used to numerically simulate the tests and to study the influence of non-uniform strain profiles along the height of the member. The study shows that the onset of buckling can be identified using either the proposed buckling theory or finite element models. Furthermore, buckling is affected by gradients of axial load or strain along the length of the member. Design recommendations are made to inhibit global wall buckling during earthquakes.
Address [Parra, Pablo F.] Univ Adolfo Ibanez, Civil Engn, Santiago, Chile
Corporate Author Thesis
Publisher Amer Concrete Inst Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0889-3241 ISBN Medium
Area Expedition Conference
Notes WOS:000427207500022 Approved
Call Number UAI @ eduardo.moreno @ Serial 837
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Author Parra, P.F.; Moehle, J.P.
Title Effects of strain gradients in the onset of global buckling in slender walls due to earthquake loading Type
Year 2020 Publication Bulletin Of Earthquake Engineering Abbreviated Journal Bull. Earthq. Eng.
Volume 18 Issue 7 Pages 3205-3221
Keywords Walls; Global buckling; Reinforced concrete; Earthquake
Abstract Global buckling of slender walls, reported only in a few laboratory tests before 2010, became a critical issue in design of reinforced concrete buildings after it was observed following the 2010 Mw 8.8 Chile earthquake and the 2011 Mw 6.3 New Zealand earthquake. Researchers have proposed theoretical buckling models based on prismatic columns subjected to uniform tension/compression cycles, where the key parameters are slenderness ratio, number of curtains of reinforcement, and maximum tensile strain before buckling during load reversal. These models have shown sufficient accuracy in comparison with laboratory tests on columns under such loading conditions. However, buckling in walls is more complex because of variation of strains through the wall depth and variation of moment along the wall height. Nonlinear finite elements are used to evaluate the effects of these more complex loadings on buckling of wall boundary elements. Analyses showed that the maximum tensile strain (averaged over the wall out-of-plane unsupported height) required to buckle the wall during load reversal does not depend on the moment variation along the wall height. Moreover, for typical wall lengths, the wall boundary behaves like an isolated column subjected to axial force cycles, with minimal apparent bracing provided by the wall web. This allows to analyze a broad range of practical cases for buckling susceptibility using simplified approaches based on buckling models of axially loaded columns.
Address [Parra, P. F.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Diagonal Torres 2700, Santiago, Chile, Email: pablo.parra@uai.cl
Corporate Author Thesis
Publisher Springer Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1570-761x ISBN Medium
Area Expedition Conference
Notes WOS:000520685900004 Approved
Call Number UAI @ eduardo.moreno @ Serial 1157
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Author Ugalde, D.; Parra, P.F.; Lopez-Garcia, D.
Title Assessment of the seismic capacity of tall wall buildings using nonlinear finite element modeling Type
Year 2019 Publication Bulletin Of Earthquake Engineering Abbreviated Journal Bull. Earthq. Eng.
Volume 17 Issue 12 Pages 6565-6589
Keywords Shear walls; Shear wall buildings; Shear wall models; Seismic response; 2010 Chile earthquake
Abstract Two existing RC shear wall buildings of 17 and 26 stories were analyzed using fully nonlinear finite element models, i.e., models that include nonlinear material behavior and geometric nonlinearities. The buildings are located in Santiago, Chile and are representative of Chilean residential buildings in the sense that they have a large number of shear walls. The buildings withstood undamaged the 2010 Chile earthquake even though they were subjected to demands much larger than the code-specified demand. The approach to model the RC shear walls was validated through comparisons with results experimentally obtained from cyclic static tests conducted on isolated wall specimens. Several pushover analyses were performed to assess the global response of the buildings under seismic actions and to evaluate the influence of several modeling issues. Response history analyses were performed considering a ground motion recorded in Santiago during the 2010 Chile earthquake. In general, results (in terms of both global and local response quantities) are consistent with results given by pushover analysis and with the empirically observed lack of damage, a consistency that was not found in a previous study that considered linearly elastic models. The tangential inter-story drift deformation was found to correlate much better with the lack of observable damage than the total inter-story drift deformation typically considered in practice. The analysis also revealed that foundation uplift is possible but does not seem to significantly influence the response. Other modeling issues that were found to deserve further research are the shear stiffness of the walls and the influence of the slabs.
Address [Ugalde, David; Lopez-Garcia, Diego] Pontificia Univ Catolica Chile, Dept Struct & Geotech Engn, Santiago, Chile, Email: dlg@ing.puc.cl
Corporate Author Thesis
Publisher Springer Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1570-761x ISBN Medium
Area Expedition Conference
Notes WOS:000496337400010 Approved
Call Number UAI @ eduardo.moreno @ Serial 1073
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