Web Services for Dynamic Coloring of UAVSAR Images     

Jun Wang  Marlon Pierce  Andrea Donnellan  Jay Parker 《Pure and Applied Geophysics》2015,172(8):2325-2332

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Accuracy of nonlinear static procedures for the seismic assessment of shear critical structures          下载免费PDF全文

Ciro Del Vecchio  Oh‐Sung Kwon  Luigi Di Sarno  Andrea Prota 《地震工程与结构动力学》2015,44(10):1581-1600

The nonlinear behavior of reinforced concrete (RC) members represents a key issue in the seismic performance assessment of structures. Many structures constructed in the 1980s or earlier were designed based on force limits; thus they often exhibit brittle failure modes, strength and stiffness degradation, and severe pinching effects. Field surveys and experimental evidence have demonstrated that such inelastic responses affect the global behavior of RC structural systems. Efforts have been made to consider the degrading stiffness and strength in the simplified nonlinear static procedures commonly adopted by practitioners. This paper investigates the accuracy of such procedures for the seismic performance assessment of RC structural systems. Refined finite element models of a shear critical bridge bent and a flexure‐critical bridge pier are used as reference models. The numerical models are validated against experimental results and used to evaluate the inelastic dynamic response of the structures subjected to earthquake ground motions with increasing amplitude. The maximum response from the refined numerical models is compared against the results from the simplified static procedures, namely modified capacity spectrum method and coefficient method in FEMA‐440. The accuracy of the static procedures in estimating the displacement demand of a flexure‐critical system and shear‐critical system is discussed in detail. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   

Human induced stepping-stone colonisation of an admixed founder population: the spread of topmouth gudgeon (Pseudorasbora parva) in Europe     

Andrea Simon  Rodolphe E. Gozlan  J. Robert Britton  Cock van Oosterhout  Bernd Hänfling 《Aquatic Sciences - Research Across Boundaries》2015,77(1):17-25

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The 2013 European Seismic Hazard Model: key components and results   总被引：11，自引：5，他引：6  

Jochen Woessner  Danciu Laurentiu  Domenico Giardini  Helen Crowley  Fabrice Cotton  Gottfried Grünthal  Gianluca Valensise  Ronald Arvidsson  Roberto Basili  Mine Betül Demircioglu  Stefan Hiemer  Carlo Meletti  Roger W. Musson  Andrea N. Rovida  Karin Sesetyan  Massimiliano Stucchi  The SHARE Consortium 《Bulletin of Earthquake Engineering》2015,13(12):3553-3596

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Preliminary ranking of alternative scalar and vector intensity measures of ground shaking   总被引：3，自引：3，他引：0  

Hossein Ebrahimian  Fatemeh Jalayer  Andrea Lucchini  Fabrizio Mollaioli  Gaetano Manfredi 《Bulletin of Earthquake Engineering》2015,13(10):2805-2840

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Diagonal cracking shear strength of unreinforced masonry panels: a correction proposal of the b shape factor     

Michele Betti  Luciano Galano  Michele Petracchi  Andrea Vignoli 《Bulletin of Earthquake Engineering》2015,13(10):3151-3186

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Slow Slip History for the MEXICO Subduction Zone: 2005 Through 2011     

Shannon Graham  Charles DeMets  Enrique Cabral-Cano  Vladimir Kostoglodov  Baptiste Rousset  Andrea Walpersdorf  Nathalie Cotte  Cécile Lasserre  Robert McCaffrey  Luis Salazar-Tlaczani 《Pure and Applied Geophysics》2016,173(10-11):3445-3465

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Lateral Variations of Interplate Coupling along the Mexican Subduction Interface: Relationships with Long-Term Morphology and Fault Zone Mechanical Properties     

Baptiste Rousset  Cécile Lasserre  Nadaya Cubas  Shannon Graham  Mathilde Radiguet  Charles DeMets  Anne Socquet  Michel Campillo  Vladimir Kostoglodov  Enrique Cabral-Cano  Nathalie Cotte  Andrea Walpersdorf 《Pure and Applied Geophysics》2016,173(10-11):3467-3486

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Model updating and seismic loss assessment for a portfolio of bridges     

Andrea Miano  Fatemeh Jalayer  Raffaele De Risi  Andrea Prota  Gaetano Manfredi 《Bulletin of Earthquake Engineering》2016,14(3):699-719

The majority of bridge infrastructures in Italy were built in the 1960s and ‘70s without any specific seismic provision being made. As a consequence, it is expected that these bridges would be highly vulnerable if subjected to a significant seismic event. Given this background, it is natural that the rapid and accurate assessment of economic losses incurred to the bridge infrastructure as a result of such an event could play a crucial role in emergency management in the immediate aftermath of an earthquake. Focusing on the infrastructure system of highway bridges in the Campania region in Italy, this paper demonstrates how both state-of-the-art methodologies in portfolio loss assessment and the available data can be used to assess the probability distribution of the repair costs incurred due to the 1980 Irpinia earthquake. Formulating a probabilistic loss assessment for a portfolio of bridges as a standard Monte Carlo simulation problem helps to resolve the spatial risk integral efficiently. One of the specific features of this case study is the use of statistical methods for updating models of: (a) ground motion predictions, (b) vulnerability/fragility and (c) exposure/costs, based on the available data. It has been observed that alternative hypotheses concerning the ground motion correlation structure can significantly affect the distribution of direct economic losses. Furthermore, updating the ground motion prediction based on available recordings may significantly reduce the dispersion in the estimate of the direct economic losses.  相似文献   

River tributaries as sediment sinks: Processes operating where the Tapajós and Xingu rivers meet the Amazon tidal river          下载免费PDF全文

Aaron T. Fricke  Charles A. Nittrouer  Andrea S. Ogston  Daniel J. Nowacki  Nils E. Asp  Pedro W. M. Souza Filho  Marcio S. da Silva  Anna M. Jalowska 《Sedimentology》2017,64(6):1731-1753

The Amazon River is the largest fluvial source of fresh water and sediment to the global ocean and has the longest tidally influenced reach in the world. Two major rivers, the Tapajós and Xingu, enter the Amazon along its tidal reach. However, unlike most fluvial confluences, these are not one‐way conduits through which water and sediment flow downstream towards the sea. The drowned‐river valleys (rias) at the confluences of the Tapajós and Xingu with the Amazon River experience water‐level fluctuations associated not only with the seasonal rise and fall of the river network, but also with semidiurnal tides that propagate as far as 800 km up the Amazon River. Superimposed seasonal and tidal forcing, distinct sediment and temperature signatures of Amazon and tributary waters, and antecedent geomorphology combine to create mainstem–tributary confluences that act as sediment traps rather than sources of sediment. Hydrodynamic measurements are combined with data from sediment cores to determine the distribution of tributary‐derived and Amazon‐derived sediment within the ria basins, characterize the sediment‐transport mechanisms within the confluence areas and estimate rates of sediment accumulation within both rias. The Tapajós and Xingu ria basins trap the majority of the sediment carried by the tributaries themselves in addition to ca 20 Mt year^?1 of sediment sourced from the Amazon River. These findings have implications for the interpretation of stratigraphy associated with incised‐valley systems, such as those that dominated the transfer of sediment to the oceans during lowstands in sea level.  相似文献