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An Overview of the National Academies-Sponsored Project: Guidance on Seismic Site Response Analysis With Pore Water Pressure Generation (NCHRP 12-114)

Session: How Well Can We Assess Site Effects So Far? II

Type: Oral

Date: 4/20/2021

Presentation Time: 02:45 PM Pacific

Description: 

National Cooperative Highway Research Program, NCHRP 12-114 is an ongoing project under the auspices of the National Academies of Sciences, Engineering, and Medicine. The objective of NCHRP 12-114 is to develop guidance on the selection and use of methods for one-dimensional (1D) nonlinear site response analysis with porewater pressure generation and dissipation. Field work will include in-situ testing and sampling at the Wildlife Site liquefaction array in southern California. The laboratory testing program will include resonant column (RC) and cyclic direct simple shear testing of silty sand. Geotechnical centrifuge testing of a Wildlife Site profile, consisting of lean clay and silty sand recovered during Wildlife Site sampling is also planned. Analytical work includes element tests and evaluation of six recorded and centrifuge case histories using four effective-stress computer programs and five advanced constitutive models. Based on guidance to be developed for this project, practicing engineers will be able to quantify the effects of site-specific soil and groundwater conditions on earthquake (design) ground motions. The prospective guidance document (i.e., the NCHRP 12-114 Final Report) is expected to be published in August 2022. It will provide information about the following: (i) input parameters needed for 1D nonlinear effective-stress SRA (e.g., site characterization information, required type of seismic loading, and information required to calibrate the model); (ii) selection, validation, and limitations of analytical methods; (iii) the process of model setup; and (iv) how to interpret the results of the analytical methods. The Principal Investigator, PI, is Dr. Neven Matasovic of Geo-Logic Associates, Inc. The NAS/NCHRP Program Manager is Dr. Waseem Dekelbab. The project is overseen by two technical review panels (GLA and NAS/NCHRP) that includes consulting engineers, representatives of several state Departments of Transportation (DOTs), and academics. The project web site is http://apps.trb.org/cmsfeed/TRBNetProjectDisplay.asp?ProjectID=4366

Presenting Author: Neven Matasovic

Student Presenter: No

Authors