On calculating equivalent static seismic forces in the 2005 National Building Code of Canada

2011 ◽  
Vol 38 (4) ◽  
pp. 476-481
Author(s):  
Patrick Paultre ◽  
Éric Lapointe ◽  
Sébastien Mousseau ◽  
Yannick Boivin
Keyword(s):  
Seismic Design ◽  
Lateral Force ◽  
Building Code ◽  
Force Distribution ◽  
Static Force ◽  
Building Height ◽  
Design Spectra ◽  
Earthquake Design ◽  
Seismic Forces

Several major changes were introduced in the seismic design provisions of the 2005 edition of the National Building Code of Canada (NBCC). The lateral earthquake design force at the base and the lateral force distribution along the building height depend on the design spectra and on modification factors that, in most cases, require a large number of interpolations and calculations. This note presents a spreadsheet that facilitates determination of the 2005 NBCC seismic design forces from the equivalent static force procedure.

Ethical Dilemmas and Seismic Design

1997 ◽  
Vol 13 (3) ◽  
pp. 489-504
Author(s):  
Tom Spector
Keyword(s):  
Seismic Design ◽  
Ethical Dilemmas ◽  
Building Code ◽  
Seismic Safety ◽  
Seismic Code ◽  
Ongoing Effort ◽  
Seismic Forces

Most research in the ongoing effort to improve building seismic safety has been devoted to improving building code methodology by refining the techniques of analysis and prediction of seismic forces. This agenda has left little room for the observation that how the code is regarded and interpreted by structural designers may have as much to do with overall seismic safety as do the code's written provisions. The purpose of this investigation is to look at both how the seismic code is viewed by practicing professional engineers and explore a range of ethical dilemmas entailed by interpreting the code. In conclusion, a case is made to consider interpretation of the seismic code to be an ethical, as well as technical matter; one that can be successfully addressed by a community of professionals acting together.

Research on Longitudinal Seismic Calculation Theory of Single-Story Factory Building

2012 ◽  
Vol 166-169 ◽  
pp. 2471-2477
Author(s):  
Hao Ning ◽  
Xiao Yin Lv ◽  
Yi Jun Wang
Keyword(s):  
Seismic Design ◽  
Building Design ◽  
Lateral Force ◽  
Effective Stiffness ◽  
Partition Walls ◽  
Force Components ◽  
Seismic Forces ◽  
Factory Building

Regarding the distribution modes of longitudinal horizontal seismic forces of single-story factory building with no purlin concrete roof, there are conflicts between Sections 9.8.1 and 5.2.6 in the Seismic Design of Buildings GB50011-2010[1]. We suggested distributing the longitudinal seismic forces according to the proportion of the gravity loads on the subordinate areas of the lateral force components. We recommended replacing clause 1 of section 9.1.8 with “Don’t consider the effective stiffness of the enclosure walls or the partition walls”. Then for the example in Single-story Factory building Design Examples, we calculated the longitudinal seismic forces with two methods, and proved the our recommended method was correct.

Dynamic analysis of buildings for earthquake-resistant design

2003 ◽  
Vol 30 (2) ◽  
pp. 338-359 ◽  
Author(s):  
Murat Saatcioglu ◽  
JagMohan Humar
Keyword(s):  
Dynamic Analysis ◽  
Seismic Design ◽  
Earthquake Engineering ◽  
Response Spectrum ◽  
Time History ◽  
Building Code ◽  
Static Force ◽  
Force Method ◽  
Inelastic Analysis ◽  
Hysteretic Response

The proposed 2005 edition of the National Building Code of Canada specifies dynamic analysis as the preferred method for computing seismic design forces and deflections, while maintaining the equivalent static force method for areas of low seismicity and for buildings with certain height limitations. Dynamic analysis procedures are categorized as either linear (elastic) dynamic analysis, consisting of the elastic modal response spectrum method or the numerical integration linear time history method, or nonlinear (inelastic) response history analysis. While both linear and nonlinear analyses require careful analytical modelling, the latter requires additional considerations for proper simulation of hysteretic response and necessitates a special study that involves detailed review of design and supporting analyses by an independent team of engineers. The paper provides an overview of dynamic analysis procedures for use in seismic design, with discussions on mathematical modelling of structures, structural elements, and hysteretic response. A discussion of the determination of structural period to be used in association with the equivalent static force method is presented.Key words: dynamic analysis, earthquake engineering, elastic analysis, fundamental period, hysteretic modelling, inelastic analysis, National Building Code of Canada, seismic design, structural analysis, structural design.

The Mexico Earthquake of September 19, 1985—Design Spectra for Mexico's Federal District

1989 ◽  
Vol 5 (1) ◽  
pp. 273-291 ◽  
Author(s):  
E. Rosenblueth ◽  
Mario Ordaz ◽  
F. J. Sánchez-Sesma ◽  
S. K. Singh
Keyword(s):  
Seismic Design ◽  
Federal District ◽  
Building Code ◽  
Design Spectra ◽  
Mexico Earthquake

We describe the methods used to obtain seismic design spectra adopted for different zones of Mexico's Federal District in 1987 Building Code. Paper exposes the two approaches followed in the study, deterministic and probabilistic. The assumptions adopted are presented and justified. Several aspects that require detailed scrutiny are pointed out.

A Seismic Design Lateral Force Distribution Based on Inelastic State of Structures

2007 ◽  
Vol 23 (3) ◽  
pp. 547-569 ◽  
Author(s):  
Shih-Ho Chao ◽  
Subhash C. Goel ◽  
Soon-Sik Lee
Keyword(s):  
Seismic Design ◽  
Lateral Force ◽  
Elastic Response ◽  
Force Distribution ◽  
Relative Distribution ◽  
Inelastic Behavior ◽  
Seismic Demands ◽  
Framed Structures ◽  
Dynamic Analyses ◽  
Nonlinear Dynamic Analyses

It is well recognized that structures designed by current codes undergo large inelastic deformations during major earthquakes. However, lateral force distributions given in the seismic design codes are typically based on results of elastic-response studies. In this paper, lateral force distributions used in the current seismic codes are reviewed and the results obtained from nonlinear dynamic analyses of a number of example structures are presented and discussed. It is concluded that code lateral force distributions do not represent the maximum force distributions that may be induced during nonlinear response, which may lead to inaccurate predictions of deformation and force demands, causing structures to behave in a rather unpredictable and undesirable manner. A new lateral force distribution based on study of inelastic behavior is developed by using relative distribution of maximum story shears of the example structures subjected to a wide variety of earthquake ground motions. The results show that the suggested lateral force distribution, especially for the types of framed structures investigated in this study, is more rational and gives a much better prediction of inelastic seismic demands at global as well as at element levels.

Seismic design lateral force distribution based on inelastic state of K-eccentric brace frames combined with high strength steel

Structures ◽  
2021 ◽  
Vol 29 ◽  
pp. 1748-1762
Author(s):  
Shen Li ◽  
Chun-hui Sun ◽  
Xiao-lei Li ◽  
Jian-bo Tian ◽  
Dui-xian Gao
Keyword(s):  
Seismic Design ◽  
High Strength Steel ◽  
High Strength ◽  
Lateral Force ◽  
Force Distribution ◽  
Brace Frames

scholarly journals Parametric Analysis of Rotational Effects in Seismic Design of Tall Structures

2021 ◽  
Vol 11 (2) ◽  
pp. 597
Author(s):  
Milan Sokol ◽  
Rudolf Ároch ◽  
Katarína Lamperová ◽  
Martin Marton ◽  
Justo García-Sanz-Calcedo
Keyword(s):  
Seismic Design ◽  
Parametric Study ◽  
Tall Buildings ◽  
Soil Parameters ◽  
Eurocode 8 ◽  
Tall Structures ◽  
Rotational Components ◽  
Different Types ◽  
Depth Study

This paper uses a parametric study to evaluate the significance of the rotational components of Earth’s motion in a seismic design. The parametric study is based on the procedures included in Eurocode 8, Part 6. Although the answer to the question of when the effects of rotational components are important is quite a complex one and requires a more in-depth study, our aim was to try to assess this question in a relatively quick manner and with acceptable accuracy. The first part of the paper is devoted to derivation of a simple formula that can be used for expressing the importance of rotational components in comparison with the classic seismic design without their usage. The quasi-static analysis, assuming inertial forces, is used. A crucial role plays the shape of the fundamental mode of the vibration. Due to simplicity reasons, well-known expression for estimation of the first eigenmode as an exponential function with different power coefficients that vary for different types of buildings is used. The possibility of changing the soil parameters is subsequently included into the formula for estimation of the fundamental frequency of tall buildings. In the next part, the overall seismic analyses of complex FEM models of 3D buildings and chimneys are performed. The results from those analyses are then compared with those from simplified calculations. The importance of the soil characteristics for determination of whether it is necessary to take into account the rotational effects is further discussed.

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