Reply: Force reduction factors for the seismic provisions of the National Building Code of Canada

1989 ◽  
Vol 16 (1) ◽  
pp. 96-97
Author(s):  
J. H. Rainer
Keyword(s):  
Building Code ◽  
Force Reduction ◽  
Reduction Factors

scholarly journals Force reduction factors for the seismic provisions of the National Building Code of Canada

1987 ◽  
Vol 14 (4) ◽  
pp. 447-454 ◽  
Author(s):  
J. H. Rainer
Keyword(s):  
Building Code ◽  
Load Factor ◽  
Limit States ◽  
Load Factors ◽  
Earthquake Resistant Structures ◽  
Structural Configurations ◽  
Force Reduction ◽  
Factor Α ◽  
Reduction Factors

A derivation of force reduction factors for the seismic provisions of the National Building Code of Canada (NBCC), 1985, is presented. This includes the following: classification of seismic actions, applicable limit states, change in load factor, derivation of force reduction factors, and classification of structural configurations. Quantitative comparisons are made between the derived force reduction factors and the response modification factors of the Applied Technology Council and good agreement was found. It is suggested that seismic requirements should be considered as accidental actions with a load factor αQ = 1.0. These results can form the basis for possible modifications to the 1985 NBCC seismic provisions. Key words: earthquake resistant structures, building code, loads, load factors.

Period-dependent seismic force reduction factors for short-period structures

1991 ◽  
Vol 18 (4) ◽  
pp. 568-574 ◽  
Author(s):  
W. K. Tso ◽  
N. Naumoski
Keyword(s):  
Reduction Factor ◽  
Structural Systems ◽  
High Ductility ◽  
Base Shear ◽  
Ductility Demand ◽  
Seismic Design Code ◽  
Short Period ◽  
Seismic Force ◽  
Force Reduction ◽  
Reduction Factors

The seismic force reduction factors proposed in the seismic provisions of the National Building Code of Canada 1990 (NBCC 1990) are examined using ground motion records from two recent Canadian earthquakes. The displacement ductility demands are analyzed for structural systems with different ductility capacity. It is found that the NBCC 1990 force reduction factors, which are period independent, lead to a very high ductility demand for short-period structural systems. To avoid this, two types of period-dependent force reduction factors for short-period structures are investigated. The results show that the linearly varying period-dependent reduction factor represents a viable means to resolve the high ductility problems associated with short-period structural systems. Key words: earthquake, seismic, design, code, response, spectra, ductility, reduction factor, base shear.

Refined force reduction factors for seismic design

2000 ◽  
Vol 22 (10) ◽  
pp. 1244-1260 ◽  
Author(s):  
B. Borzi ◽  
A.S. Elnashai
Keyword(s):  
Seismic Design ◽  
Force Reduction ◽  
Reduction Factors

scholarly journals Seismic design implications of revisions to the National Building Code of Canada

2003 ◽  
Vol 36 (2) ◽  
pp. 108-116
Author(s):  
A.C. Heidebrecht
Keyword(s):  
Seismic Hazard ◽  
Seismic Design ◽  
Site Effects ◽  
Major Change ◽  
Building Code ◽  
Structural Systems ◽  
Seismic Code ◽  
History Of ◽  
Force Reduction ◽  
Code Development

This paper begins with a brief introduction to Canadian seismicity and the history of seismic code development in Canada; a summary of major changes planned for the 2005 edition of the National Building Code of Canada follows. Areas of major change include seismic hazard, site effects, irregularities, force reduction factors and methods of analysis (dynamic analysis now being preferred). The implications of the proposed changes are presented in terms of impact on seismic design force for several structural systems located in regions of high, moderate and low seismicity; implications for seismic level of protection and the seismic design process are also discussed. The paper concludes with a discussion of ongoing seismic code development issues.

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