The National Institute of Building Sciences Building Seismic Safety Council (BSSC) will host a webinar Wednesday, September 28, from 2:00 to 3:00 pm EST, discussing content in the National Earthquake Hazards Reduction Program’s (NEHRP) 2015 NEHRP Recommended Seismic Provisions and ASCE/SEI 7-16, Minimum Design Loads for Buildings and Other Structures. This webinar will focus on updated requirements to both the Response Spectrum Analysis (RSA) method and Linear Response History (LRH) analysis method. "Response Spectrum Analysis/Linear Response History Analysis" is the fifth in a series of webinars sponsored by the Federal Emergency Management Agency (FEMA). Participants may earn one professional development hour (PDH).
Presenter James O. Malley, SE, senior principal with Degenkolb Engineers, will address RSA procedures in ASCE 7, and Finley Charney, PhD, PE, professor of structural engineering at Virginia Tech and president of Advanced Structural Concepts, Inc., will talk about the revision of Chapter 16 of ASCE 7-16 and moving Linear Response History Analysis (LRH) to Chapter 12.
The Response Spectrum Analysis (RSA) method has been widely used for the dynamic analysis of structures since the 1950’s, with the formal introduction of these procedures into building codes in the 1980’s. The 2015 NEHRP Provisions have made a number of changes to the RSA procedures in ASCE 7-10, addressing the following topics:
- Introducing a new method of calculating procedure to capture 100% of the effective mass.
- Removing the allowance to scale the RSA base shear to no more than 85% of the Equivalent Lateral Force base shear.
- Requiring three dimensional modeling with use of RSA techniques, including diaphragm flexibility when appropriate.
- Updating commentary to reflect modern methods for modal combination parameters.
This presentation will summarize these updates to the RSA procedures in ASCE 7.
The second presentation in the webinar will address revision of Chapter 16 of ASCE 7-16 and moving Linear Response History Analysis (LRH) to Chapter 12. Specifically, it will cover:
- Advantages of LRH analysis
- Intended consistency with Response Spectrum Analysis Overview of the LRH Procedure in Chapter 12 of ASCE 7-16
- Modeling the structure in 3-Dimensions
- Accidental torsion and P-delta effects
- Use of spectrum matched ground motions
- Scaling of results
- Determining envelope values of component force and story drift.
Sign up now to attend the free “Response Spectrum Analysis/ Linear Response History Analysis” webinar on September 28. Space is limited to 100 participants, so don’t wait.