The Mexico Earthquake of September 19, 1985—Behavior of Steel Buildings

1989 ◽  
Vol 5 (1) ◽  
pp. 51-88 ◽  
Author(s):  
J. Osteraas ◽  
H. Krawinkler
Keyword(s):  
Case Studies ◽  
Mexico City ◽  
Structural Models ◽  
Code Design ◽  
Steel Buildings ◽  
Design Strength ◽  
Actual Strength ◽  
Mexico Earthquake ◽  
Story Building

During the September 19, 1985 earthquake about 60 post-1957 multistory steel buildings in Mexico City were subjected to a severe test. In most cases, the damage in the post-1957 structures was minor to moderate. The notable exception is the Pino Suarez complex in which one 21-story building collapsed onto a 14-story building, and two other 21-story buildings were severely damaged. The behavior of these buildings as well as two other case studies are analyzed. Conclusions are drawn on the ductility demands imposed on steel buildings in Mexico City, utilizing simplified structural models and considering the actual strength of buildings that may be much higher than the code design strength.

The Mexico Earthquake of September 19, 1985—Typical Cases of Repair and Strengthening of Concrete Buildings

1989 ◽  
Vol 5 (1) ◽  
pp. 175-193 ◽  
Author(s):  
M. Jara ◽  
C. Hernández ◽  
R. García ◽  
F. Robles
Keyword(s):  
Case Studies ◽  
Mexico City ◽  
Damage Assessment ◽  
Analysis And Design ◽  
Concrete Buildings ◽  
Temporary Protection ◽  
Practical Design ◽  
Mexico Earthquake ◽  
Emergency Measures ◽  
Made In

It is the aim of this paper to describe the most important techniques that are being used in Mexico City to retrofit buildings damaged during the 1985 earthquake. The information is presented by means of four case studies. These cases offer practical design examples of the typical solutions adopted and illustrate the various aspects of the repair and strengthening process such as damage assessment, emergency measures for temporary protection, the retrofitting technique employed in each case and considerations and decisions made in the analysis and design.

scholarly journals Damage assessment and seismic behavior of steel buildings during the Mexico earthquake of 19 September 2017

2020 ◽  
Vol 36 (1) ◽  
pp. 250-270 ◽  
Author(s):  
Edgar Tapia-Hernández ◽  
J. Salvador García-Carrera
Keyword(s):  
Mexico City ◽  
Damage Assessment ◽  
Structural Damage ◽  
Steel Structures ◽  
Structural Elements ◽  
Steel Buildings ◽  
Ground Shaking ◽  
Design Procedures ◽  
Mexico Earthquake ◽  
Epicentral Region

During the 19 September 2017 earthquake, steel buildings in the States of Morelos, Puebla, Mexico, and Mexico City were subjected to severe ground shaking. Despite in some cases, moderate damages in non-structural elements were developed; generally, null or minor structural damage was reported. The notable exceptions are (1) a three-stories building located at the southern area of Mexico City and (2) some schools near to the epicentral region in the State of Morelos. The behavior of these buildings is analyzed in detail. Conclusions are drawn on the demands imposed on steel structures considering the actual demands in order to underline the relevance of the normative design procedures.

The Mexico Earthquake of September 19, 1985—Ductility and Resistance Requirements Imposed on a Concrete Building

1989 ◽  
Vol 5 (1) ◽  
pp. 41-50 ◽  
Author(s):  
E. Sordo ◽  
A. Terán ◽  
J. J. Guerrero ◽  
H. Juárez ◽  
J. Iglesias
Keyword(s):  
Dynamic Analysis ◽  
Mexico City ◽  
Spectral Response ◽  
The Real ◽  
Linear Dynamic ◽  
Ductility Factor ◽  
Concrete Building ◽  
Waffle Slab ◽  
Mexico Earthquake ◽  
Peak Value

This paper describes the study of a twelve floor concrete building with a waffle slab system located 300 meters from the accelerometer at Secretaria de Comunicaciones y Transportes (S.C.T) in Mexico City. First, the reduced seismic coefficient associated with the failure of the critical story is calculated by a linear dynamic analysis which reproduces the damage provoked by the 1985 earthquake to the real structure. Second, the ductility factor associated with the damaged stories is obtained through a step-by-step non-linear dynamic analysis. Finally, the peak value of the S.C.T. maximum ordinate for spectral response corresponding to 5 percent of critical damping was determined from this analysis.

The Mexico Earthquake of September 19, 1985—New Accelerograph Network for Mexico City

1989 ◽  
Vol 5 (1) ◽  
pp. 249-255 ◽  
Author(s):  
J. M. Espinosa-Aranda ◽  
A. Uribe ◽  
B. Frontana ◽  
O. Contreras ◽  
G. Ibarrola
Keyword(s):  
Local Government ◽  
Mexico City ◽  
Seismic Records ◽  
Mexico Earthquake ◽  
Field Stations

As a result of the observed effects induced by the earthquakes of September 1985 in Mexico City's structures, the local government authorities increased their support for the installation of accelerographs in a network covering different zones of Mexico City. This paper presents the activities developed by the Centro de Instrumentación y Registro Sísmico (CIRES) concerned with: selection and procurement of suitable instruments, identification of the installation sites, and the installation of field stations. We also describe methods applied to the processing of seismic records and include a summarized catalog of accelerograms recorded to date.

The Mexico Earthquake of September 19, 1985—Case Studies of Seismic Strengthening for Two Buildings in Mexico City

1989 ◽  
Vol 5 (1) ◽  
pp. 153-174 ◽  
Author(s):  
D. A. Foutch ◽  
K. D. Hjelmstad ◽  
E. Del Valle Calderón ◽  
E. Figueroa Gutiérrez ◽  
R. E. Downs
Keyword(s):  
Reinforced Concrete ◽  
Mexico City ◽  
Reinforced Concrete Frame ◽  
Concrete Walls ◽  
Concrete Frame ◽  
Reinforced Concrete Walls ◽  
Steel Bracing ◽  
Geotechnical Investigations ◽  
Mexico Earthquake ◽  
The City

The earthquake that shook Mexico City on 19 September 1985, destroyed several hundred buildings and took thousands of lives. Two buildings located in the most highly damaged part of the city experienced strong shaking, but suffered only slight damage. These reinforced concrete frame buildings had been retrofit with steel bracing systems and infill reinforced concrete walls prior to the earthquake. Forced vibration tests, analytical studies and geotechnical investigations for each building have been conducted. The results indicate that the steel bracing systems strengthened the buildings and stiffened them, moving their natural periods away from the 2.0-second predominant ground period in that part of the city. Implications for the design of strengthening systems have been determined.

The Mexico Earthquake of September 19, 1985—Statistics of Damage and of Retrofitting Techniques in Reinforced Concrete Buildings Affected by the 1985 Earthquake

1989 ◽  
Vol 5 (1) ◽  
pp. 145-151 ◽  
Author(s):  
J. Aguilar ◽  
H. Juárez ◽  
R. Ortega ◽  
J. Iglesias
Keyword(s):  
Reinforced Concrete ◽  
Statistical Analysis ◽  
Data Base ◽  
Mexico City ◽  
Failure Modes ◽  
Reinforced Concrete Buildings ◽  
Concrete Buildings ◽  
Mexico Earthquake

The 1985 Mexico City earthquake caused very serious damage, especially in reinforced concrete buildings, making it necessary to repair and strengthen many structures. The authors had the opportunity to study 114 of these retrofitted buildings. The data base created with the collected information contains the description of the building, its damages and the retrofitting techniques used. The statistical analysis of this information makes it possible to identify the correlation among the structural and foundation types, the dominant failure modes, the causes of damage and the repair and strengthening techniques used in this group of buildings.

The Mexico Earthquake of September 19, 1985—Past Decisions, Present Danger: An Historical Perspective on Ecology and Earthquakes in Mexico City

1988 ◽  
Vol 4 (3) ◽  
pp. 469-479 ◽  
Author(s):  
S. Tobriner
Keyword(s):  
Mexico City ◽  
Historical Perspective ◽  
The World ◽  
History Of ◽  
Mexico Earthquake

Why is one of the most populous cities in the world built on land which has a history of subsidence, seismicity, and flooding? Mexico City illustrates how early decisions in a city's history can create difficult conditions for building well and living safely. The Aztecs had little choice but to live on the muddy islands in Lake Texcoco which now lie beneath downtown Mexico City. But the Spanish did have a choice. By selecting the island capital of Tenochtitlan for their colonial capital they bequeathed to succeeding generations problems which were apparent to them almost immediately after they began construction. Their solution to the hydraulic problems of the site only exacerbated ecological and seismic problems which the inhabitants of Mexico City face today, and destroyed the reason the first settlers inhabited the Valley of Mexico.

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