Overview of seismic provisions of the proposed 2005 edition of the National Building Code of Canada

Heidebrecht, A. C.

doi:10.1139/l02-068

Cited by 54 publications

(31 citation statements)

References 10 publications

(16 reference statements)

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“…Over the years, these guidelines have evolved to reflect the growing understanding of the causes and regional characteristics of earthquakes, as well as their effects on structures. This evolution has closely followed developments in international codes, and has been described in several papers and reports, including Mitchell et al (2010), Gilles (2008), andHeidebrecht (2003). Let us however briefly summarize the seismic design provisions of the 2005 NBCC.…”

Section: Overview Of Seismic Design Provisions In Canadamentioning

confidence: 82%

In Situ Dynamic Characteristics of Reinforced Concrete Shear Wall Buildings

Gilles

McClure

2012

Structures Congress 2012

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Structural engineers routinely need to make assumptions about the dynamic properties (natural periods, mode shapes, and damping) of a building to simulate its response to dynamic loads, such as strong winds or earthquake ground motions. However, the assumed properties may significantly differ from those of the actual building, once it is constructed, due to differences between the idealized model and in situ conditions. The main objectives of this study are to evaluate how common models and assumptions used to predict the dynamic properties of buildings compare to those measured in actual buildings, and to develop improved prediction models.To this end, ambient vibration measurements were performed in 39 buildings on the island of Montréal and the dynamic properties of up to six vibration modes were identified, for each of these buildings, using the enhanced frequency domain decomposition method. Though the initial goal was to obtain a representative sample of different types of buildings, 27 of these 39 buildings turned out to be reinforced concrete buildings with shear walls providing the main resistance to lateral loads. Hence, the scope of this study was narrowed to the dynamic properties of reinforced concrete shear wall (RCSW) buildings. The measured dynamic properties of this subset of 27 buildings were then used to evaluate different models, proposed in building codes and in the literature, to predict the natural periods and damping characteristics of these types of buildings. Finally, simple models to predict the natural periods of torsion and second translation modes were proposed based on regression analyses. These models agree very well with those that have been proposed in the literature. Again, equations corresponding to different probability levels (mean, mean minus one standard deviation, and mean plus one standard deviation) were produced as a measure of uncertainty.This study should help engineers select realistic values of the dynamic properties of RCSW buildings for structural analysis and design, and should ultimately improve engineers' ability to predict the dynamic response of these buildings. Further, the proposed models could lead to improved recommendations in building codes.iii This research could not have been possible without the help of many building owners and managers, who allowed our team to perform vibration measurements in their buildings. I would also like to thank the numerous graduate and undergraduate students who were involved in these tests for both their participation and the stimulating discussions that often ensued:

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Section: Overview Of Seismic Design Provisions In Canadamentioning

confidence: 82%

In Situ Dynamic Characteristics of Reinforced Concrete Shear Wall Buildings

Gilles

McClure

2012

Structures Congress 2012

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“…While there has been a move to base national building codes on the 2%/50 year probability level in order to provide a better basis to assess seismic hazard across the country for the target building performance [17], it was not felt necessary for Albania at this time.…”

Section: Methodsmentioning

confidence: 99%

“…They allow an engineer to read off the spectral value for each period and then construct a UHS for his particular site. This approach that will be used by the 2005 National Building Code of Canada [17]. It contrasts with the previous, 1995, National Building Code which divided Canada into seven zones and specified the design value to be used in each zone.…”

Section: Contours Versus Zonesmentioning

confidence: 99%

Probabilistic seismic hazard maps for Albania

Aliaj¹,

Adams

Halchuk

et al. 2004

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SUMMARYAlbania is a Balkan country with high rate of seismicity, and earthquake risk reduction has been an important, on-going socioeconomic concern. We adapt the experience and methods used for Canadian seismic hazard maps to present, for the first time, probabilistic spectral hazard maps for Albania. A revised catalogue of Albanian earthquakes, from 58 A.D. to 2000, with magnitude Ms>4.5 in the region between 39/N and 43/N and 18.5/E and 21.5/E was used in this study. Ten seismic source zones are used to define the seismicity. We have used the Ambraseys et al. (1996) strong ground motion relations for rock to produce 5% damped spectral acceleration values at 0.2, 0.5, 1.0 and 2.0 seconds (as well as peak ground acceleration) for a return period of 0.0021 per annum (equivalent to a 10% chance of non-exceedence in 50 years). The four spectral parameters maps will allow the construction of site-specific Uniform Hazard Spectra for all of Albania, and are suggested as the basis of the next version of the KTP-N.2-89 Technical Aseismic Regulations to improve earthquake-resistant design code in Albania.

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“…The response reduction factor R is determined as the product of the force modification factor R d and the over-strength factor R 0 . R d is the ratio between the elastic design force, corresponding to the design spectrum in the Peruvian code [8], and the ultimate 12 force given by the capacity curve; R 0 is the ratio between such ultimate force and the yielding one [41]. In the strong direction of building L2, the actual value of factor R d is not shown because it is smaller than 1; it means that the design spectrum in the Peruvian code [8] does not correspond to the actual strength in that direction.…”

Section: Conclusion From the Push-over Analyses Of The Representativmentioning

confidence: 99%

Seismic performance of buildings with thin RC bearing walls

Gonzales

Almansa

2012

Engineering Structures

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In Latin America there is an urgent need for housing; thus, during the last few years a relevant number of mid-height buildings (usually, up to five stories) with thin RC shear-walls have been constructed for low-cost dwellings in Bolivia, Colombia, Ecuador, Mexico, Peru, Venezuela, and other countries located in seismic-prone regions. These walls are 10 cm thick and their reinforcement consists mainly of a single layer of welded wire mesh. This construction technology offers two main advantages: economy and rapidity of construction. These buildings do not fulfill the international seismic codes but some national regulations are less demanding, not preventing the use of thin bearing walls. These buildings might be vulnerable to earthquakes because of their low ductility, the insufficiency of the experimental information, the absence of observed damages and, in some cases, poor construction quality. This work describes the initial steps of a wider research aiming at providing reliable seismic design guidelines for thin-wall buildings; the initial objectives are analyzing the seismic performance of these buildings, proposing preliminary design criteria and identifying further research needs. This research focuses on buildings located in Peru, being representative of the situations in the other countries. The vulnerability is numerically evaluated by push-over and nonlinear time history analyses; the structural parameters are obtained from available testing information. The obtained results show that the seismic strength of the analyzed buildings is insufficient; however, minor changes in the structural design might improve significantly their seismic performance. Economical and easy-to-implement design recommendations are issued.

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Overview of seismic provisions of the proposed 2005 edition of the National Building Code of Canada

Cited by 54 publications

References 10 publications

In Situ Dynamic Characteristics of Reinforced Concrete Shear Wall Buildings

In Situ Dynamic Characteristics of Reinforced Concrete Shear Wall Buildings

Probabilistic seismic hazard maps for Albania

Seismic performance of buildings with thin RC bearing walls

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