Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 23
Filtrar
Mais filtros










Filtros aplicados
Base de dados
Intervalo de ano de publicação
2.
Artigo em Espanhol | Desastres | ID: des-15826

RESUMO

Este artículo pretende estudiar en detalle el estado y los daños típicos de los puentes en acero y en estructura mixta (acero y concreto) de la Red Vial Nacional de Colombia. El estudio está basado en la evaluación del inventario y las inspecciones realizadas por el Instituto Nacional de Vías (Invias) desde el año de 1996, a través del Sistema de Administración de Puentes de Colombia (Sipucol). El artículo se divide en dos (2) partes: en la primera se presenta una descripción de las diferentes tipologías de los puentes en acero basados en el módulo de inventario del Sipucol y en la segunda el estado y los daños típicos de los componentes principales. De los doscientos cuarenta y cuatro (244) puentes en acero que hacen parte de la Red Vial Nacional, se encontraron deficiencias estructurales, corrosión generalizada y parcial, infiltración, detallado no adecuado de las uniones, identificación de problemas de fatiga en uniones y regular calidad de las uniones soldadas. Este documento constituye una base para una futura y más completa investigación, con el objeto de avanzar en el tema de la inspección detallada y conservación de puentes de acero, estructuras vitales en la infraestructura vial. (AU)


Assuntos
Pontes (Edificações) , Medição de Risco , Estradas , Colômbia , Avaliação de Danos em Infraestrutura
3.
Artigo em Espanhol | Desastres | ID: des-15828

RESUMO

Se evalúan los empujes activos dinámicos de suelos sobre estructuras de contención del tipo de gravedad, analizando la naturaleza del problema, evaluando los diferentes tipos de falla, y el comportamiento de estas estructuras bajo las hipótesis de desplazamientos despreciables y de desplazamientos predeterminados. Se examina la influencia y la relación entre los parámetros que intervienen en la formulación de Mononobe y Okabe. Se presentan expresiones simplificadas de cálculo de empuje dinámico activo y se propone una nueva formulación simplificada aplicable para los niveles de acción sísmica probable en Argentina. Finalmente, se presenta un ejemplo numérico de aplicación, formulando sugerencias aplicables al diseño sismorresistente de estribos y muros de gravedad. (AU)


Assuntos
Terremotos , Engenharia Sísmica , Solo , Avaliação de Danos , Deslizamentos de Terra , Pontes (Edificações)
4.
In. Reyes, Carlos; Zepeda, Oscar; Gutiérrez, Carlos; Durán, Roberto; Domínguez, Leobardo; Mendoza, Manuel J.; Alcocer, Sergio A.; Durán, Roberto; Echavarria, Alfonso; Flores Leonardo; López, Oscar A.; Pecheco, Miguel Angel; De la Torre, Oscar; Bitrán, Daniel; Colorado, Jorge A.; García, Norlang. El sismo de Tecomán, Colima del 21 de enero de 2003 (Me 7.6). México, D.F, México. Centro Nacional de Prevención de Desastres (CENAPRED). México. Secretaría de Gobernación, nov. 2003. p.71-7, ilus. (Informes técnicos).
Monografia em Espanhol | Desastres | ID: des-15882
5.
Artigo em Espanhol | Desastres | ID: des-15045

RESUMO

La mayoría de los puentes importantes construidos en los últimos años y la vía elevada del metro de Santiago incluyen algún tipo de aislación sísmica y en varios de ellos se han instalado redes locales de acelerómetros con el fin de monitorear su respuesta frente a terremotos. En este trabajo se analizan los registros, tanto de vibraciones ambientales como de sismos, obtenidos a la fecha en el puente Marga-Marga de Viña del Mar, en el tramo elevado de la Línea 5 del metro de Santiago y en el puente Amolanas, ubicado en el kilómetro 308 de la carretera Panamericana Norte. Además, se presentan modelos de elementos finitos que reproducen las características dinámicas obtenidas experimentalmente.(AU)


Assuntos
Engenharia Sísmica , Terremotos , Resposta Sísmica , Pontes (Edificações) , Engenharia Civil
6.
Artigo em Espanhol | Desastres | ID: des-14170

RESUMO

El Puente Warth fue diseñado y construido a pricipios de los años setenta, con códigos sísmicos ahora obsoletos. Por lo tanto, era necesario una revisión de su comportamiento actual para la toma de futuras decisiones sobre su mantenimiento o rehabilitación. En este artículo se muestra el análisis realizado para definir la vulnerabilidad sísmica de esta estructura, considerando un método simplificado de evaluación del daño máximo y la aplicación de la simulación por Monte Carlo para definir la respuesta probable del puente. En este análisis, se tomaron en cuenta las incertidumbres inherentes a las propiedades estructurales y a la excitación sísmica externa, mediante dos escenarios sísmicos. Los resultados obtenidos muestran que bajo algunas condiciones de carga deberían ser consideradas posibles reparaciones moderadas(AU)


Assuntos
Pontes (Edificações) , Análise de Vulnerabilidade , Medição de Risco , Áustria , Reforço de Estruturas , Avaliação de Danos em Infraestrutura
7.
Artigo em Espanhol | Desastres | ID: des-14173

RESUMO

El objetivo de este trabajo, es estudiar el efecto de la no-linealidad del suelo de fundación en el desarrollo de las fuerzas y desplazamientos que se producen en las fundaciones de grupos de pilotes, para estructuras de puentes y compararlos con modelos que consideran lineal la interacción suelo-pilote (ISP). Para este trabajo se escogió un puente existente y se modeló considerando que estaba soportado en cinco perfiles de suelos diferentes, los cuales variaban desde rígidos a blandos. También se incluyó la alternativa de usar gruos de pilotes verticales o grupos de pilotes inclinados. De esta forma, diez fundaciones diferentes fueron diseñadas; cinco para grupos de pilotes verticales y cinco para grupos de pilotes inclinados. Para la metodología que considera interacción suelo-pilote (ISP) lineal, se establecieron basados en consideraciones no lineales, límetes de desplazamientos horizontales y cargas máximas laterales para el pilote, así como para cada una de las fundaciones diseñadas. Estos límites, determinan el máximo desplazamiento o carga lateral en el pilote (o fundación) para la cual las metodologías que consideran ISP lineal, producen desplazamientos horizontales conservadores en el pilote (o fundación). dichos límites, van a depender entre otros factores, de la rigidez del suelo y de si los pilotes en las fundaciones se encuentran en posición vertical o inclinados. Comparaciones entre las fuerzas desarrolladas en los pilotes que conforman la fundación, para las cargas de diseño, se obtuvieron mediante consideraciones de ISP lineal y no lineal. Se encontró que siempre que no se excedió el límite de la metodología (LM), los resultados usando ISP lineal fueron conservadores al estimar los desplazamientos y las fuerzas en los pilotes diseñados(AU)


Assuntos
Pontes (Edificações) , Características do Solo , Construções Antissísmicas , Resposta Sísmica , Análise de Vulnerabilidade , Medição de Risco
9.
Tegucigalpa; Honduras. Centro de Estudios Ambientales de Honduras (CEAH); nov. 2000. 126 p. ilus, mapas.
Monografia em Espanhol | Desastres | ID: des-14696
10.
New York; U.S. Multidisciplinary Center for Earthquake Engineering Research (MCEER); Sept. 2000. 119 p. ilus, tab.(Technical Report, MCEER-00-0008).
Monografia em Inglês | Desastres | ID: des-12993

RESUMO

This report documents the current state-of-practice in soil-structure interaction analyses for seismics desing of bridges. It covers several relevant areas such as ground motion aspects, various issues on soil-structure interaction for typical foundations and methods of substructuring to reduce the number of degrees of freedom for foundation elements. The ground motion topic includes seismic hazard analyses, seismic perfomance criteria, spectrum compatible time history, spatial variation of ground motions, effects of local soil condition, and the recent ATC-32 recommendations on standard ARS (Acceleration Response Spectrum) design criteria. The soil-structure interaction area discusses modeling of foundation stiffness and damping for spread footing, gravity caisson, large diameter drilled shaft, and pile group. The concept of substructuring technique is described fully. The technique offers two approaches: one bases on kinmatic soil-structure interaction and the other based on inertia interaction. Both are intented to reduce the number of degrees of freedom for the foundation to be used in the global bridge analyses. (AU)


Assuntos
Pontes (Edificações) , Modelos Estruturais , Resposta Sísmica , Engenharia Sísmica , Construções Antissísmicas , Engenharia Civil
11.
New York; U.S. Multidisciplinary Center for Earthquake Engineering Research (MCCER); July 2000. 109 p. ilus, tab.(Technical Report MCEER, 00-0007).
Monografia em Inglês | Desastres | ID: des-13867
12.
In. Scawthorn, Charles. The Marmara, Turkey earthquake of August 17, 1999 : Reconnaissance report. Buffalo, New York, U.S. Multidisciplinary Center for Earthquake Engineering Research (MCEER), Mar. 2000. p.59-72, ilus. (Technical Report MCEER, 00-0001).
Monografia em Inglês | Desastres | ID: des-12617

RESUMO

This section describes damage sustained by the transportation infraestructure as a result of the Marmara earthquake in Turkey on August 17, 1999


Assuntos
Terremotos , Transportes , Avaliação de Danos em Infraestrutura , Avaliação de Danos , Pontes (Edificações) , Estradas , Efeitos de Desastres nas Edificações , Turquia
13.
In. Japón. University of Tokyo. International Center for Disaster-Mitigation Engineering (INCEDE); Japón. University of Tokyo. Earthquake Resistant Structure Research Center (ERS); Japón. University of Tokyo. Voluntary Information Network for Earthquake Disaster Mitigation (KOBEnet). Join report on 1995 Kobe earthquake. Tokyo, Japón. University of Tokyo. International Center for Disaster-Mitigation Engineering (INCEDE);Japón. University of Tokyo. Earthquake Resistant Structure Research Center (ERS);Japón. University of Tokyo. Voluntary Information Network for Earthquake Disaster Mitigation (KOBEnet), Dec. 1999. p.57-112, ilus, mapas, tab. (INCEDE Report, 15).
Monografia em Inglês | Desastres | ID: des-13057

RESUMO

This paper introduces an outline of liquefaction, its induced ground deformation and damage to lifeline facilities and foundations of buildings and bridge piles during the 1995 Hyogoken-nambu (Kobe) earthquake. Characteristics of ground displacement andstrain measured by aerial survey are described. Some typical examples of large ground displacements are presented and a casual relationship of damage to buried pipes and foundation piles with the ground displacements is investigated. In addition, the present paper introduces several examples of foundations proved to have resited against the liquefaction and its induced ground displacements during the earthquake. (AU)


Assuntos
Terremotos , Liquefação , Avaliação de Danos em Infraestrutura , Pontes (Edificações) , Medição de Risco , Obras Civis , Japão
14.
In. Japón. University of Tokyo. International Center for Disaster-Mitigation Engineering (INCEDE); Japón. University of Tokyo. Earthquake Resistant Structure Research Center (ERS); Japón. University of Tokyo. Voluntary Information Network for Earthquake Disaster Mitigation (KOBEnet). Join report on 1995 Kobe earthquake. Tokyo, Japón. University of Tokyo. International Center for Disaster-Mitigation Engineering (INCEDE);Japón. University of Tokyo. Earthquake Resistant Structure Research Center (ERS);Japón. University of Tokyo. Voluntary Information Network for Earthquake Disaster Mitigation (KOBEnet), Dec. 1999. p.127-142, ilus. (INCEDE Report, 15).
Monografia em Inglês | Desastres | ID: des-13059

RESUMO

At 5:46 a.m.(local time) on January 17, 1995, the Great Hanhin(Hyogoken-nambu or Kobe) earthquake hit the Hanshin-Awaji area, Japan. The damage due to this eartquake was the worst eartquake disaster in Japan since the 1923 Great Kanto earthquake. Over 100.000 houses and buildings collapsed and many modern civil infraestructures such as elevated bridges of highways and railways and port facilities, etc. were also heavily damaged. In addition, fires broke out razing many houses after the quake. The death toll was more then 6.400 including deaths due to various problems followint the earthquake. Unfortunately, mos deaths were caused due to collapse of structures. To mitigate casualties due to earthquakes, it is important to study the mechanism of collapse of structures during earthquakes. In this study, using the Extended Distinct Element Method(EDEM) wich is applicable to both a composite and continuous medium, and a perfect discrete one, the collapse mechanism of structures during the 1995 Great Hanshin earthquake is studied. Although the phenomena treated in this study were difficult to be simulated by the conventional methods such as the finite element method, the numerical results obtained agree well with the actual earthquake damage. (AU)


Assuntos
Terremotos , Pontes (Edificações) , Avaliação de Danos em Infraestrutura , Impacto de Calamidades , Efeitos de Desastres nas Edificações , Japão
15.
Buffalo, New York; U.S. Multidisciplinary Center for Earthquake Engineering Research (MCEER); July 1999. 154 p. ilus, tab.(Technical Report MCEER, 99-0011).
Monografia em Inglês | Desastres | ID: des-12589

RESUMO

The overall objective of this task was to review and compare the methods currently in use for the desing of cable restrainers used to tietogether simple spans in multiple-span, simply-supported bridges and to recommend improvements which will provide better performance while maintaining ease and efficiency of desing. Two existing methods, one each developed by Caltrans and AASHTO, were compared and evaluated. Three new methods were also proposed and evaluated. All five procedures were found to be effective in preventing spans from unseating in most bridges. However, the authors recommend that the procedure known as the "proposed" method be used for future desing, as it provided the best overall performance under moderate-to-large earthquakes. A companion MCEER report, "Design Procedures for Hinge Restrainers and Hinge Seat Widht for Multiple-Frame Bridges," by R. Desroches and G.L. Fenves, MCEER-98-0013, provides similar evaluations and recommendations regarding the design of cable restrainers for multiple continuous span bridges


Assuntos
Pontes (Edificações) , Engenharia Civil , Engenharia Sísmica , Construções Antissísmicas , Resposta Sísmica
16.
Buffalo, New York; U.S. Multidisciplinary Center for Earthquake Engineering Research (MCEER); July 1999. 162 p. ilus, tab.(Technical Report MCEER, 99-0015).
Monografia em Inglês | Desastres | ID: des-12591

RESUMO

This document deals with the methodologies that were developed to assess liquefaction risk at existing highway bridges, select appropriate ground and/or foundation improvement methods to reduce the risk of damage, design the improvements, and verify that these improvements had been achieved in the field. The report describes the methodologies developed, methodologies to assess liquefaction risks are presented in flowchart form, progressing from simple to more complex methods. A number of remediation methods are considered, including grouting compaction, vibro systems, surcharge and buttress fills, reinforcement and containment, vertical drains and underpinning. Relevant information is summarized from some numerical and laboratory (shaking table centrifuge tests) studies conducted by other researchers on the performance of liquefaction remediation


Assuntos
Pontes (Edificações) , Liquefação , Medidas de Segurança , Prevenção e Mitigação , Avaliação de Danos , Medição de Risco , Engenharia Civil , Construções Antissísmicas
17.
Buffalo, New York; U.S. Multidisciplinary Center for Earthquake Engineering Research (MCEER); Apr. 1999. 166 p. ilus, tab.(Technical Report MCEER, 99-0007).
Monografia em Inglês | Desastres | ID: des-12603

RESUMO

The Multidisciplinary Center of Earthquake Engineering Research (MCEER) is a national center of excellence in advanced technology applications that is dedicate to the reduction of earthquake losses nationwide. Headquartered at the University at Buffalo, State University of New York, the Center was originally established by the National Science Foundation in 1986, as the National Center for Earthquake Engineering Research (NCEER). Response spectrum analyses are perfomed on all six bridges usinga all of the above ground motion parameters for the cases of (a) two-component horizontal only input and (b) three-component input. Results for the two cases are compared. The accuracy of these resultus is validated by linear time history analyses of three bridges using spectrum compatible records. The additional effect of including the vertical component of motion is presented as a ratio of the dead-load only response. Records with early-arriving short period motion in the vertical component are shown to produce similar structural response to records that do not have these caracteristics. Results from response spectrum analyses using vertical spectrum with a spectral amplitude 2/3 of the horizontal spectrum showed that the response can be up to 40


greater or less than those from empirical vertical spectra


Assuntos
Deslizamentos de Terra , Pontes (Edificações) , Resposta Sísmica , Engenharia Sísmica , Engenharia Civil
18.
Buffalo, New York; U.S. Multidisciplinary Center for Earthquake Engineering Research (MCEER); Apr. 1999. 94 p. ilus.(Technical Report MCEER, 99-0013).
Monografia em Inglês | Desastres | ID: des-12605

RESUMO

This report assesses the perfomance of existing steel bridges in the past earthquakes. There is an identification of the areas in existing steel bridge structures that are seismically vulnerable. Among the examined components there are: steel columns, steel tower bents, steel superstructures (particularly steel trusses), girder cross-frames, and steel connections. Vulnerable areas and details are identified, and recommendations for improved designs and retrofit techniques are made. Research needs are identified where existing knowledge is lacking. There is an examination of the three most common lateral force existing systems: MRF's: moment resisting frames; CBF's: concentrically braced frames and EBF's; eccentrically braced frames. It indicates that any of them can provide adequate seismic structural ductility. There is also an analysis of X-braces and X-braces and V-braced bridges piers as a way of getting potential structural ductility. It has a lis of illustrations, which include configurations, pier designs, axial loads and analytical models of connections, among others


Assuntos
Pontes (Edificações) , Aço , Resposta Sísmica , Engenharia Sísmica , Engenharia Civil , Reforço de Estruturas
19.
Buffalo, NY; United States. Multidisciplinary Center for Earthquake Engineering Research (MCEER); Feb. 1999. 134 p. ilus, tab.(Technical Report MCEER, 99-0003).
Monografia em Inglês | Desastres | ID: des-12268

RESUMO

This research is concerned with validation of alternative theories for seismic design and retrofit of bridge structures. The intent of these methodologies is to not only maintain life safety of bridges in a strong eartquake, but also to control damage while accommodating large seismically-induced deformations in order to maintain post-earthquake serviceability. The primary purpose of this research endeavor is to verify that both Control and Repairability of Damage (CARD) and Retrofit, Control and Repairability of Damage (ReCARD) sacrificial fuse-bar plastic hinge details have adequate fatigue life under realistic seismic loading -including the effects of variable axial loads that arise from a combination of the framing action of multiple column pier bents and vertical ground motion. As a secondary purpose, a new technique called Quasi-Earthquake Displacement (QED) Experimentation is developed to verify the CARD and RECARD construction details. The experimentation is developed to verify the CARD and ReCARD construction details. The experimental technique uses a non-linear time-history computational simulation to predict seismic displacements (and forces) in a prototype structure. These earthquake-induced actions are scaled to permit laboratory experiments to be conducted on reduced scale subassemblages of the prototype structure. It is concluded that reinforced concrete bridge columns that possess sacrificial/replaceable fuse-bars have sufficient cyclic capacity under the most adverse seismic loading conditions (including large axial load variation) to sustain a strong foreshock, mainshock and aftershock


Assuntos
Pontes (Edificações) , Engenharia
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA