Fragility analysis of hillside buildings designed for modern seismic design codes

2018 ◽  
Vol 27 (14) ◽  
pp. e1500 ◽  
Author(s):  
Mitesh Surana ◽  
Yogendra Singh ◽  
Dominik H. Lang
Keyword(s):  
Seismic Design ◽  
Fragility Analysis ◽  
Design Codes

Evolution of seismic design codes of highway bridges in Chile

2021 ◽  
pp. 875529302098801
Author(s):  
José Wilches ◽  
Hernán Santa Maria ◽  
Roberto Leon ◽  
Rafael Riddell ◽  
Matías Hube ◽  
...  
Keyword(s):  
Seismic Design ◽  
Failure Modes ◽  
Highway Bridges ◽  
Design Codes ◽  
Seismic Codes ◽  
Analysis And Design ◽  
Residual Displacements ◽  
Shear Keys ◽  
Maule Earthquake ◽  
2010 Maule Earthquake

Chile, as a country with a long history of strong seismicity, has a record of both a constant upgrading of its seismic design codes and structural systems, particularly for bridges, as a result of major earthquakes. Recent earthquakes in Chile have produced extensive damage to highway bridges, such as deck collapses, large transverse residual displacements, yielding and failure of shear keys, and unseating of the main girders, demonstrating that bridges are highly vulnerable structures. Much of this damage can be attributed to construction problems and poor detailing guidelines in design codes. After the 2010 Maule earthquake, new structural design criteria were incorporated for the seismic design of bridges in Chile. The most significant change was that a site coefficient was included for the estimation of the seismic design forces in the shear keys, seismic bars, and diaphragms. This article first traces the historical development of earthquakes and construction systems in Chile to provide a context for the evolution of Chilean seismic codes. It then describes the seismic performance of highway bridges during the 2010 Maule earthquake, including the description of the main failure modes observed in bridges. Finally, this article provides a comparison of the Chilean bridge seismic code against the Japanese and United States codes, considering that these codes have a great influence on the seismic codes for Chilean bridges. The article demonstrates that bridge design and construction practices in Chile have evolved substantially in their requirements for the analysis and design of structural elements, such as in the definition of the seismic hazard to be considered, tending toward more conservative approaches in an effort to improve structural performance and reliability for Chilean bridges.

Fuzzy set-theoretic models for interpretation of seismic design codes

1989 ◽  
Vol 29 (3) ◽  
pp. 277-291 ◽  
Author(s):  
Seema Alim ◽  
David Lloyd Smith
Keyword(s):  
Seismic Design ◽  
Fuzzy Set ◽  
Design Codes

Seismic Displacement Design Method Comparison between Chinese, American, European and Japanese Seismic Design Codes

2013 ◽  
Vol 859 ◽  
pp. 43-47
Author(s):  
Gui Ming Zhang ◽  
Wen Feng Liu ◽  
Zhi Hong Chen
Keyword(s):  
Seismic Design ◽  
Design Method ◽  
Method Comparison ◽  
Chinese American ◽  
Frame Structure ◽  
Design Codes ◽  
Reinforced Concrete Frame ◽  
Seismic Displacement ◽  
Story Drift ◽  
Earthquake Action

Seismic displacement design method and allowable values of story drift are compared between Chinese, American, European and Japanese seismic design codes. An engineering example's seismic displacement is calculated in the methods given by the four codes, and story drift are compared. Researches show that allowable story drift of Chinese code under rare earthquake action is approximately close to that of American with a 10% probability of exceedance in 50 years, and allowable story drift of Japanese code is more rigorous than other three codes. For three-story three-span reinforced concrete frame structure, in the condition of same intensity, displacement of Chinese under the earthquake action with 2~3% exceeding probability of 50-year is greater than that of American and European with 10% exceeding probability of 50-year. However, intensity plays no role in Japan's displacement calculation, and the calculation result of displacement of Japanese code is less than other three codes.

On the correlation of the components of strong ground motion—Part 2

1981 ◽  
Vol 71 (4) ◽  
pp. 1323-1331
Author(s):  
A. H. Hadjian
Keyword(s):  
Correlation Coefficient ◽  
Ground Motion ◽  
Seismic Design ◽  
Strong Ground Motion ◽  
Statistical Data ◽  
Correlation Coefficients ◽  
Design Codes ◽  
Simple Description ◽  
Rectangular Distribution ◽  
Strong Ground

abstract The correlation coefficient of the two horizontal components of strong ground motion is studied as an aid in specifying characteristics of synthetically generated motions to be used simultaneously in the dynamic response of structures. The recorded available data is “extended” by recognizing certain properties of the components of ground motion such that the statistical data used includes all possibilities of the orientation of recording accelerographs. The probability density function of the correlation coefficients is derived numerically, which could be used for further studies of the characteristics of ground motion. From this distribution, an approximate yet simple description of the correlation coefficient of the components of ground motion is derived for use in seismic design codes: it is shown that the value of the correlation coefficient of the components of ground motion can be approximated by a rectangular distribution ranging from −0.32 to 0.32. For all practical purposes the correlation coefficient varies from −0.5 to +0.5.

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