Cody, the seismic values in ASCE 7-10 are based on the 2008 National Seismic Hazard model developed by USGS. The values in the 2016 edition use the 2014 National Seismic Hazard model. In comparing disaggregated values of seismic parameters obtained form the two models, it appears that in both...
I have a project in Vonore, TN where we are adding on to something that we designed when the Reference code was ASCE7-10. The reference code now is -16 and it appears the seismic values have jumped significantly. 7-10 values Ss = 40 7-16 values Ss = 70 Any idea as to why these values bumped up 75%?
#Seismic #EarthquakeandEarthquakeLoads #Other
ACI 18 13 4 1.png
The reason ASCE 7 Section 12.9 requires scaling up modal response forces is because engineers may model a structure using assumptions that results in an overly flexible model. Since use of an overly flexible model will result in a period T that is excessively large, it will also result in...
ASCE 7-16 (and 7-22) section 12.9.1.4.2 states that, if the MRSA drift base shear is < Cs*W where Cs is determined in accordance with Eq. 12.8-6 (or 12.8-7 in ASCE 7-22), then the MRSA drifts are scaled up by Cs*W / Vt. There seem to be two interpretations of this provision: (a) scale up to Eq....
Minimum Design Loads and Associated Criteria for Buildings and Other Structures, ASCE/SEI 7-22 provides the most up-to-date and coordinated loading provisions for general structural design. This standard prescribes design loads for all hazards including dead, live, soil, flood, tsunami, snow,...