Roberto Meli

Roberto Meli
Universidad Nacional Autónoma de México | UNAM · Institute of Engineering

PhD

About

64
Publications
39,352
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1,125
Citations
Citations since 2017
0 Research Items
514 Citations
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
Introduction
Skills and Expertise

Publications

Publications (64)
Article
The Mexico City Cathedral underwent major rehabilitation during the 1990s to mitigate the effect of extreme differential settlement. As part of a comprehensive program, the project undertook a partial correction of existing differential settlements and remedial interventions to prevent additional settlement and improve the structural safety of the...
Article
Full-text available
A severe storm event occurred over the western area of Mexico City causing the rupture of a drainage tunnel, resulting in surface flooding, severe infrastructure damage and three deaths. This paper describes the methodology followed in order to validate the diagnostic of the event. The detailed investigation comprised in situ observation of the sys...
Chapter
It is the aim of this chapter to assess the general situation of earthquake resilience in communities in Mexico. This evaluation is performed from a public policy point of view. From the diagnosis presented, challenges and areas of opportunity for implementing programs aimed at reducing risk and attaining more resilience are discussed. It is conjec...
Article
Full-text available
This paper reports the results of the second phase of a research program that carried out shaking table tests on a scale model of a typical stone masonry temple. This second phase evaluates the efficacy of two different retrofitting techniques by comparing the response of the retrofitted models with that of the original unreinforced model. It was f...
Article
One of the commonly used advantages in the construction of bridges is the possibility of dividing beams into two prefabricated sections imposing thus a hinge without significantly altering the distribution of internal forces with respect to that of a continuous beam. However, a weakness of this solution is the possibility of premature cracking in t...
Article
Full-text available
RESUMEN En este trabajo se estudia el comportamiento mecánico de juntas planas típicas similares a las utilizadas en túneles dovelados, mediante pruebas de laboratorio en modelos a escala. Se aplicaron cargas axiales excéntricas para simular el comportamiento de las juntas, las cuales se incrementaron hasta la falla del espécimen. Asimismo, se prop...
Conference Paper
Full-text available
En este trabajo se estudia la interacción entre el revestimiento primario y el secundario de un anillo de túnel dovelado; con el fin de evaluar la transmisión de carga de un revestimiento al otro, así como de posibles deslizamientos o separaciones entre ellos. Debido al proceso constructivo, el revestimiento secundario se coloca meses después de ha...
Article
A shaking table testing program was undertaken with the main objective of providing basic information for the calibration of analytical models, and procedures for determining seismic response of typical stone masonry temples of the 16–18th centuries stone masonry construction in Mexico. A typical colonial temple was chosen as a prototype. A model a...
Conference Paper
Full-text available
With the main objective of providing basic information for calibration of analytical models and procedures for determining seismic response of historic stone masonry buildings, a shaking table testing program was undertaken at the Institute of Engineering of UNAM. A typical colonial temple was chosen as a prototype. The model was built at a 1:8 geo...
Article
This study was intended to find out about the extent in which the sixteenth century Mexican convent builders followed certain patterns or rules in determining the structural elements dimensions and arrangement for their convent churches, specifically the walls and buttresses to counteract the vaults' thrust. The study aimed to know if the structura...
Article
Full-text available
Se propone un procedimiento de diseño sísmico de columnas de puentes de concreto reforzado, basado en desplazamiento, en el que se establece el cumplimiento de dos niveles de desempeño: servicio y supervivencia. La capacidad de desplazamiento de las columnas de sección rectangular y circular se calcula con expresiones empíricas en función de las di...
Article
The seismic response of the Mexico City Cathedral built of very soft soil deposits is evaluated by using motions recorded in various parts of the structure during several moderate earthquakes. This unique set of records provides significant insight into the seismic response of this and other similar historic stone masonry structures.Free-field grou...
Article
Structural safety of colonial stone masonry buildings is severely jeopardized in most parts of Mexico by earthquakes and by ground subsidence. The situation is particularly severe in Mexico City where subsidence has been aggravated by excessive extraction of underground water. Despite of frequent rehabilitations, cumulative damage caused by differe...
Conference Paper
Full-text available
RESUMEN Se presentan los cambios más significativos a las Normas Técnicas Complementarias para Diseño y Construcción de Estructuras de Mampostería del Distrito Federal. Los cambios se basan en programas experimentales, analíticos y en observaciones de campo realizadas en México y en otros países. Durante el proceso de revisión, se hizo énfasis en c...
Conference Paper
Full-text available
The purpose of the paper is to evaluate the capability and validity of results of commonly performed linear-elastic analyses to study the seismic response of historical masonry buildings. Results from the analyses of two typical churches of the colonial era in Mexico are compared with the common patterns of damage observed in these structures after...
Conference Paper
Full-text available
A brief description is given of the origins and evolution of seismic design codes and practices in Mexico. The Mexico City Building Code is more deeply examined since, for many years, it has been a reference document in Mexico for the drafting of most of the Mexican codes, which, by law, are of municipal competence. Problems related to the implemen...
Article
Some of the structural earthquake-disaster mitigation programs implemented in developing countries are evaluated, with an emphasis on Latin America. Recommendations for reducing the vulnerability of engineered construction include the following: (1) promote the use of structural systems with a built-in large seismic capacity; (2) avoid the adoption...
Article
Full-text available
Se presenta una comparación entre dos procedimientos, forma espectral normalizada y ley deatenuación espectral, para estimar el espectro de aceleraciones horizontales absolutas para unafracción del 5 por ciento del amortiguamiento crítico en la estación acelerográfica CU. Esta estaciónse localiza en la zona de terreno firme de la ciudad de México,...
Article
Full-text available
Para apoyar las decisiones sobre el proyecto de rehabilitación de la Catedral de la ciudad de México se instaló una red de acelerógrafos que ha venido funcionando desde 1997. Se presenta en este trabajo una descripción dela red y los resultados que se han obtenido en sus primeros tres años de operación, en los que ha registrado 16 eventos sísmicos....
Article
Full-text available
Results of the many efforts and programs carried out in the last decades to reduce earthquake losses are critically evaluated. Over time, earthquake damage has risen because the level of exposure, both in terms of number and value of goods and properties, has increased. It is also concluded that a significant vulnerability reduction has not yet bee...
Chapter
Potentially destructive phenomena such as volcanic eruptions occur independently of any human action. Disasters may occur when a social group fails to respond to a threatening situation resulting from volcanic activity or any other manifestation. Society may thus react to a threat and reduce the possibility of a disaster. Volcanic crisis management...
Conference Paper
Full-text available
Este trabajo presenta una descripción general de los modelos de elemento finito utilizados para estudiar el comportamiento estructural de la Catedral y el Sagrario de la ciudad de México. En particular, se discuten las principales ventajas y limitaciones cuando éstos son analizados bajo cargas gravitacionales y hundimientos diferenciales. Para ello...
Article
Full-text available
A 14-storey reinforced concrete building and the underlying soil were instrumented with strong motion accelerographs to study the amplification of seismic waves, the soil-structure interaction and the structural response to earthquakes of buildings founded on soft soil, such as the lake-bed area of Mexico City. A detailed investigation of the geote...
Article
The Mexico City Cathedral is undergoing major rehabilitation aimed at correcting a significant portion of its differential settlements, which had reached 2.4 m at the end of 1991. Relevant structural investigations are briefly described in this paper, including the assessment of safety under vertical loads, differential settlements and seismic acti...
Article
The article reviews the most important aspects of volcanic eruptions and presents a summary of the harmful materials they emit. The main health effects can be classified as either physical (trauma, respiratory diseases, etc.) or psychological (depression, anxiety, nightmares, neurosis, etc.). Popocatépetl, the most famous active volcano in Mexico,...
Article
The Copala earthquake is the largest earthquake to occur in Mexico since the destructive 1985 events. The strong motion data from this earthquake highlights the enormous progress in instrumentation that has occurred over the past 10 years. Hypocentral parameters for the earthquake are listed. The fault plane involved is shallow-dipping plane and st...
Article
On September 14, 1995, at 8:04 AM, local time (14:04, GMT), an earthquake of magnitude Ms = 7.2 (Mw = 7.3) took place in the Pacific coast of the State of Guerrero, Mexico, close to the town of Copala, with epicenter located at 16.7°N and 98.5°W. The shallow focal depth (17.5 km), the focal mechanism (thrust) and the low dip angle indicate that it...
Article
A two-story waffle-flat-plate reinforced-concrete model structure was subjected to cyclic loading simulating a severe earthquake. The test structure was a one-third-scale model that represented a structural system that is common in Mexico City and that had a high rate of damage during the 1985 Mexico earthquake. The structure was designed with wide...
Conference Paper
Full-text available
RESUMEN: Se estudia un edificio de concreto reforzado de 14 niveles, localizado en la rona de suelo blando, el cual está instrumentado con varios acelerógrafos. El análisis de los registros obtenidos de sismos de pequeña intensidad muestra que las frecuencias naturales de vibración cambian con las amplitudes de desplazamiento, este hecho no se atri...
Article
The overall effects of the 1985 Mexico earthquake on buildings are summarized, with special consideration of the performance of prestressed concrete buildings. Then, for five typical prestressed concrete buildings, results of analyses of the dynamic response, with due consideration of the soil-structure interaction, are presented. In general, the c...
Chapter
The aim of this contribution is to present some aspects of the relationship between the scientific community, the authorities, the press and the general public, regarding the prediction of possible disasters. The comments refer to the situation in Mexico and more specifically to two examples related to the seismic risk resulting from the high proba...
Book
Full-text available
A total of 12 typical and regular masonry buildings with similar structural configurations and 3 to 5 levels were studied. Some of them are on soft soil whereas the rest are located on hard ground. These structures were designed according to the Emergency Regulations released a few days after the September 1985 earthquakes in Mexico City. None of t...
Article
Response of simple structural models to the peculiar ground motions recorded in the lake‐bed area of Mexico City was analyzed in order to explain the performance of typical buildings during the 1985 earthquake. Results for one‐degree of freedom systems with different kinds of inelastic behavior show that when hysteresis loops remain stable under se...
Book
This research project has had the following main objectives: to document the repair and retrofitting work carried out on buildings that were damaged as a consequence of earthquake ground motions of the 1957, 1979 and 1981 earthquakes and to document the performance of these buildings during the September 19 and 20, 1985 earthquakes; to conduct deta...
Book
This project compared the observed performance of typical buildings in Mexico City with the behavior that could be predicted by analyzing their response through models with different levels of sophistication and calibrated the present methods for seismic design and for the prediction of seismic response of buildings. A set of typical mid-rise concr...
Book
The objectives of this project were to evaluate the performance of masonry buildings in Mexico City and to calibrate the present practice for seismic design of low-cost housing. In the first phase, from the census of damaged buildings a set of 23 representative structures was selected and a detailed survey of damage and of structural properties was...
Book
The objective of this study was to investigate the effect of earthquake duration and frequency content (narrow-band versus broad-band elastic response spectra) on the inelastic behavior of structures when accounting for gravity loads and the flexibility of the foundation (soil-structure interaction effects). To achieve the above objectives it was p...
Book
The aim of this project was to check if the behavior of beams and columns designed according to the provisions of the Mexican Code guarantee the development of large inelastic deformations without degradation of the strength and of the capacity for energy dissipation. In a first part of the project the inelastic behavior of flexural elements reinfo...
Book
The 1985 Mexican earthquake left a large number of damaged reinforced concrete buildings which appear to be suitable for repair and strengthening. The reconstruction process provided an opportunity for the U.S. earthquake engineering community to observe, firsthand, a large-scale effort to (1) determine the condition of the building suffering vario...
Book
The experience in Mexico City shows that many solutions are possible for a given structure. Peer review procedures may improve the redesign process. Communication between parties is essential so that nonstructural and nonarchitectural concerns, such as cladding, partitions, and flow of traffic, are addressed properly. Most redesign schemes are not...
Article
Many mid-rise buildings with waffle-flat plates of concrete columns were severely damaged by the Sept. 19, 1985 earthquake in Mexico City. The characteristics of these buildings and the prevailing modes of failure are briefly described. The performance of three specific buildings is evaluted and compared with what could be predicted from present de...
Chapter
As a first step in evaluating the effects of the earthquake, the gathering of evidence was a matter of high priority, as it could disappear in a few days because of the demolition and removal of collapsed or severely damaged buildings.
Article
The author (who was a part of the commission reviewing Mexico City's Building Code), comments on the modifications made to Section VI 'Structural Security of Buildings' of this regulation. He presents the initial criteria and the applied judgments, and a complete explanation chapter by chapter.
Article
This article describes the characteristics of the 1986 San Salvador earthquake. An analysis is given of the structural damages caused to various buildings from data obtained in geotechnical investigations of the soil motion spectrum. Comparisons are given of this earthquake and the Mexico City earthquake of September 19, 1985.
Article
The main Mexico earthquake of 1985 was unique on many counts in Mexico City; the ground motions were unique as to intensity, regularity, frequency content, and duration. There is no other recorded ground motion in history having a spectral acceleration as high as 1. 17 g at a 2-second period and 5-percent damping (peak ground acceleration was 0. 2...
Article
Full-text available
Se presentan resultado de análisis dinámicos de casas de adobe de un piso. Los casos estudiados cubren la mayoría de las variantes en dimensiones y cargas de las construcciones que con este material existe en México. Se analiza el efecto en la respuesta sísmica de la geometria y disposición de los muros, de la forma de la planta y de la presencia d...
Article
In absence of reliable analytical procedures, the adequacy of structural resistance can be judged from proof-loading experiments. Neither a unified method nor a clear rationale exists now for the design of such experiments. Reliability approaches have been only partially successful, due to their oversimplification of the test, especially with regar...
Article
Reporte de investigación sobre el comportamiento sísmico de la mampostería. Se describen los mecanismos de falla principales de la mampostería y se propone métodos para la predicción de la resistencia de muros ante distintos tipos de fuerza. Se analiza el comportamiento de la mampostería ante cargas laterales alternadas identificando las variables...
Article
El objetivo de este estudio es establecer un criterio de diseño por hundimientos diferenciales en construcciones de muros de mampostería sobre terreno comprensible, con base en la optimización del costo total incluyendo el daño esperado.
Article
Full-text available
Contenido: 1. Marcos sujetos a fuerzas laterales. 2. Sistemas con muros o contravientos sujetos a cargas laterales. 3. Análisis tridimensional. 4. Análisis sísmico estático de edificios. 5. Conceptos fundamentales de dinámica Análisis sísmico dinámico. 7. Principios de diseño sísmico. 8. Criterios de Estructuración. 9. Requisitos para el dimensiona...
Article
Contenido: Introducción al diseño estructural; Seguridad estructural y criterios de diseño; Las acciones y sus efectos sobre las estructuras; Sistemas estructurales; Aspectos del análisis estructural; Diseño sismorresistente; Diseño estructural de cimentaciones.
Article
Contenido: Legislación; Estudios, proyectos y financiamiento para edificios; Excavaciones y cimentaciones; Estructuras; Demoliciones; Albañilería y acabados; Instalaciones; Control de calidad; Administración de la construcción.
Article
Emisión del programa Nexos TV del 21 de septiembre de 1995, transmitida diez años después del sismo del 19 de septiembre de 1985 y propuesta como una reflexión sobre los sucesos, lo qué pudo haberse evitado y los aprendizajes del que ha sido uno de los mayores desastres en la historia nacional. El temblor produjo enormes daños materiales y la muert...
Article
Full-text available
Incluye bibliografía Reimpresión del 2000

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Projects (2)
Project
To share information on best international practices related to design and construction of confined masonry buildings in earthquake-prone areas of the world
Project
The structural behavior of segmental tunnels built in soft soils, which are affected by the soil consolidation, is studied. The variation in the piezometric conditions causes changes in the state of stresses on the soil and on the tunnel lining. This issue modifies the structural behavior of the tunnel in the short and long term.