May 2017 Dinner Meeting

Please join us for our May dinner meeting next week on Thursday May 25th at the Best Western Executive Inn (Seattle). The Early Registration Deadline is this Friday, so please go and sign up and we hope to see you at this month’s dinner meeting.

The Evolving Role of Geomaterials in the Infrastructure Systems

We are excited to announce that Dr. J. David Frost, Professor at Georgia Tech will be speaking at our May dinner meeting at the Best Western Executive Inn (200 Taylor Ave N).

 Thursday, May 25th

Click Here for more information

2017 Hennes Lecture at University of Washington

The GIGGS group at the University of would like to invite everyone to join them at their annual Hennes Lecture.  It is being held on Friday May 26th from 4pm-7pm on the UW campus. The presentation will be given my Jonathan Stewart, Chair of Civil Engineering at UCLA.

Friday, May 26
Presentation: 4:00 – 5:00
Reception: 5:00 – 7:00 (snacks provided, and drinks available for purchase)
The lecture is on the UW campus, in the Husky Union Building (HUB) Room 145
The event is free to attend and RSVP is not needed.
Contact: Shane Joseph Markus markussh@uw.edu

Title:
Site response uncertainty and its implications for seismic risk characterization

Abstract:
Along with source and path effects, site response analysis is a vital component of earthquake ground motion characterization. Ground motion prediction equations (GMPEs) include terms for modeling site response that are based on simple metrics of site condition, such as the time-average shear wave velocity in the upper 30 m (VS30). Because site terms in GMPEs are derived from global databases, and are based on incomplete information on site conditions, their predictions represent average levels of site response conditional on VS30. Such predictions are referred to as ergodic.

Actual site response at a given site is likely to differ from this global average. Viewed in this context, the actual site response for a particular site and intensity measure is the sum in log units of the ergodic estimate from a global model and a (generally unknown) site term (denoted hS). If the level of site-specific error (hS) can be identified and used to adjust the ergodic model, the ground motion analysis is more accurate (i.e., bias is removed) and the dispersion of the predicted ground motions is reduced. Therefore, site-specific evaluations of site response are useful and will often reduce mean hazard levels at long return periods (due to dispersion reduction), although uncertainty in the site response is considered in an epistemic manner.

Important questions pertaining to this process include how should these evaluations be performed, how reliable are the resulting site response estimates, and how can the results be used in a probabilistically rigorous manner as required for hazard- or risk-based applications?

With this in mind, the presentation will cover:

  1. The physical processes responsible for site effects;
  2. The manner by which these processes are (or are not) reflected in relatively generic site factors used in GMPEs and in building codes;
  3. Effectiveness of site-specific geotechnical ground response analyses to estimate site effects;
  4. Recommended procedures for evaluating site-specific site response and its implementation in hazard/risk characterization for critical facilities.

 

Seattle Spring Short Course and Seminar 2017: Ground Improvement

Seattle Spring Short Course and Seminar 2017: Ground Improvement
ASCE Seattle Section Geotechnical Group & Geo Institute – Seattle Chapter

We look forward to seeing everyone at our Spring Short Course and Seminar next week. If you have not signed up yet please consider joining us.

The ASCE Seattle Section Geotechnical Group is pleased to announce our 34th annual Spring Seminar. Following completion of our first of its kind document “Commentary Guidelines for Ground Improvement Using Discrete Elements”, this year’s topic is Ground Improvement and will cover many types and aspects of ground improvement. The full day seminar will be held on Saturday, April 22, 2017 on the University of Washington campus in Seattle, Washington. A one-day short course on ground improvement will be held on the Friday before the seminar.

 For additional information please see the attached information: 2017-ASCE-Spring-Seminar-and-Short-Course

 Please join us for the Spring Short Course 2017 and the Spring Seminar 2017.

 

 

March 2017 Dinner Meeting

Please join us for our March dinner meeting this week on Thursday March 23rd at the Best Western Executive Inn (Seattle). We hope to see you at our upcoming dinner meeting.

Prediction of Ground Movements Associated with Tunneling and Their Effects of Adjacent Structures

We are excited to announce that Dr. Whittle, Professor at MIT  will be speaking at our March dinner meeting at the Best Western Executive Inn (200 Taylor Ave N).

 Thursday, March 23rd

Click Here for more information

2017 Stanley D. Wilson Memorial Lecture

Shannon & Wilson, Inc. and the University of Washington’s Department of Civil and Environmental Engineering are pleased to present the 2017 Stanley D. Wilson Memorial Lecture. Steve Kramer will discuss “Time and Soil Liquefaction” on Thursday, March 23 at 5:30 in Room 389 of Mary Gates Hall on the University of Washington Campus. Please R.S.V.P. by March 16th at rsvpsea@shanwil.com or (206) 695-6743. The event is free to the public.

2017 Wilson Lecture Postcard