#Asce 7 2010 free pdf archive
#Asce 7 2010 free pdf code

These can be found by fitting an appropriate distribution to observed data but is complicated by spatial variation of the wind climate, therefore it is unclear which data are relevant at a particular location. Results also show that the wind speed corresponding to the factored design wind load in NBCC-2010 is associated with a return period ranging from 200 to 5000 years, but for 90% of stations considered, the range narrows to 300 to 900 years.Įstimates of high return period design wind speeds are required to achieve an acceptable probability of failure.

A comparison of the maps of v AH-50 to those inferred from NBCC-2005 and NBCC-2010 shows that the developed map retains some of the smoothness of the wind speeds exhibited in NBCC-2010, while maintains the localized wind speed features presented in NBCC-2005. Wind speed contour maps for Canada are developed based on the estimated v AH-T for T equal to 50, 500, and 1000 years. The results indicate that it is preferable to treat v AH as a Gumbel variate, and to carry out the fit using the generalized least-squares method. Statistical analysis and distribution fitting were carried out using the Gumbel distribution and generalized extreme value distribution and several fitting methods were employed.

Two hundred and thirty-five meteorological stations are considered in the analysis, and height and exposure corrected annual maximum hourly-mean wind speed, v AH, are extracted.

#Asce 7 2010 free pdf archive

To potentially improve the estimates of v AH-50, wind records in the Environment Canada HLY01 digital archive were processed. The changes are due to analysis approaches, available wind records, and a re-examination of anemometer histories.

#Asce 7 2010 free pdf code

A review of the two most recent editions of the National Building Code of Canada (NBCC) indicates that significant changes in some 50-year return period wind speeds, v AH-50, were introduced in the 2010 version of the NBCC-2010 compared to the previous NBCC-2005. Reference wind velocity pressures corresponding to specified return period wind speeds are provided in several Canadian design codes. It was concluded that option (i) is preferred to cope with sample size effect if the design in a region with statistically homogeneous wind climate for code making with spatially varying coefficient of variation of annual maximum wind speed, the analysis results support the use of option (ii) since it leads to improved consistency of reliability.

The implication of the results is discussed in terms of two alternative options to specify the factored design wind load: (i) a low return period for selecting nominal wind speed combined with a large wind load factor and (ii) a high return period for selecting nominal wind speed combined with unity wind load factor. The results show that the effect of statistical uncertainty due to limited sample size on the estimated return period value of the wind speed and structural reliability is largely reduced if the sample size is increased from 10 to 20. The influence of this uncertainty on the estimated return period values of annual maximum wind speed and structural reliability is quantified in this study. The small sample size of the annual maximum wind speed at a wind speed recording site causes uncertainty in the estimated return period of wind speed.