Adaptive Negative Stiffness: New Structural Modification Approach for Seismic Protection

29 Jul 2013 | Contributor(s): Dharma Theja Reddy Pasala, Apostolos Aristotelis Sarlis, Satish Nagarajaiah, Andrei M Reinhorn, Michael Constantinou, Douglas Taylor

Yielding can be emulated in a structural system by adding an adaptive negative stiffness device (NSD) and shifting the yielding away from the main structural system, leading to the new idea of “apparent weakening” that occurs, ensuring structural stability at all displacement amplitudes. This is...

Adaptive Passive Stiffness Shaping and Apparent Weakening for Seismic Protection

13 Mar 2014 | Multimedia | Contributor(s): NEES EOT

Presenters: S. Nagarajaiah, Rice University, Houston; A. M. Reinhorn and M. C. Contantinou, University at Buffalo, Buffalo; M. Symans, RPI, Troy; D. Taylor, Taylor Devices, Buffalo; J. Zhang, UCLA, Los Angeles There is no cost to attend this webinar. PDHs will be available from EERI after the...

Adaptive Reuse of Concrete Cladding Panels

07 Aug 2012 | Poster | Contributor(s): Kurt Michael McMullin, Eugenia L Tai

A NEES project focused on the seismic behavior of precast concretecladding panels generally used as building facades, also known as the PathwaysResearch Project, has just recently completed the testing phase. The testedconcrete panels have limited damage and are largely intact. Rather than...

Adaptive Stiffness Shaping using Negative Stiffness Device and Apparent Weakening for Seismic Response Control of Multi-story Buildings: Novel Distributed Isolation

29 Jul 2014 | Publications | Contributor(s): Satish Nagarajaiah, Dharma Theja Reddy Pasala

“Apparent weakening” of structures using the negative stiffness device (NSD) is a new passive structural control approach developed by the authors to mitigate the response of structures during severe ground motions. Experimental studies on a SDOF inelastic system bolstered the idea and confirmed...

Advanced NURBs-Based Metamodels

25 Jan 2011 | Poster | Contributor(s): John Christopher Steuben

NURBS-based metamodels have shown promise for increasing the capabilities of the design engineer. The effective implementation of algorithms for fitting and manipulating NURBs-based metamodels has been achieved, but limitations currently exist on the creation and analysis of these metamodels. Two...

Advanced Servo-Hydraulic Control And Real-Time Testing Of Damped Structures

16 Aug 2010 | Active Documents | Contributor(s): James Michael Ricles, cheng chen

The Real-time Multi-directional (RTMD) Earthquake Simulation Testing Facility has recently been commissioned at the ATLSS Center. This facility has state-of-the-art servo-hydraulic equipment (servo-valves, accumulation and piping systems). The control system for this equipment is a digital system...

Advances in Low-Cost Seismic Isolation with Rubber

15 May 2014 | Publications | Contributor(s): Dimitrios Konstantinidis, James Kelly

Advances in Low Cost Seismic Isolation with RubberThis paper examines multi-layer elastomeric isolation bearings where the reinforcing elements, normally thick and inflexible steel plates, are replaced by thin flexible reinforcement. The reinforcement is provided by carbon fiber or thin flexible...

Advances in Real-Time Hybrid Simulation Workshop

26 Oct 2011 | Multimedia | Contributor(s): Richard Christenson, James Michael Ricles, Thomas Marullo

To disseminate information on recent multi-site real-time hybrid simulation testing conducted in the Network for Earthquake Engineering Simulation (NEES); disseminate other recent advances in real-time hybrid simulation for civil structures; and facilitate collaboration of researchers, ideas and...

Advances in Self-Centering Steel Plate Shear Wall Testing and Design

15 May 2014 | Publications | Contributor(s): Patricia Clayton, Daniel Dowden, Chao-Hsien Li, Jeffrey Berman, Michel Bruneau, K.-C. Tsai, Laura Lowes

Advances in Self-Centering Steel Plate Shear Wall Testing and DesignThe self-centering steel plate shear wall (SC-SPSW) was developed as part of a NEESR-SG research project aimed at leveraging the benefits of self-centering post-tensioned steel frames with the strength and ductility of steel...

ADVANTAGES OF ACTIVE LOVE WAVE TECHNIQUES IN GEOPHYSICAL CHARACTERIZATION OF SEISMOGRAPHIC STATION SITES—CASE STUDIES IN CALIFORNIA AND THE CENTRAL AND EASTERN UNITED STATES

15 May 2014 | Publications | Contributor(s): Antony Martin, Alan Yong, Lawrence Salomone

Geophysical Characterization of Seismographic Station Sites in California and the Central and Eastern United States—the use of Active Love Wave TechniquesAs part of a suite of non-invasive geophysical techniques, active-source Love waves recorded by the multi-channel analysis of surface wave...

Aerial Robots for Rapid Response: Remote Autonomous Exploration and Mapping

06 Feb 2012 | Poster | Contributor(s): Nathan Michael

We report recent results from field experiments conducted with a team of ground and aerial robots toward the collaborative mapping of an earthquake damaged building. The goal of the experimental exercise is the generation of 3D maps that capture the layout of the environment and provide insight...

Aftershock Fragility Analysis of a Reinforced Concrete Shear Wall Using Updated Nonlinear Model

15 May 2014 | Publications | Contributor(s): Wei Song

Aftershock Fragility Analysis of a Reinforced Concrete Shear Wall Using Updated Nonlinear ModelThe goal of model updating is to assess the structural performance by reducing the discrepancies between the model and the real structure. Starting from the piloting research stage of structural health...

Aftershock Risk in Japan Following Tohoku Earthquake

15 May 2014 | Publications | Contributor(s): Nilesh Shome, Chesley Williams

Aftershock Risk in Japan Following Tohoku EarthquakeRecent Tohuku earthquake has clearly showed that aftershocks following large magnitude earthquakes are a source of significant risk. In this study, we have followed the Reasenberg and Jones (1989) approach to describe the aftershock activity...

Aftershock Risks such as those Demonstrated by the Recent Events in New Zealand and Japan

15 May 2014 | Publications | Contributor(s): Nilesh Shome, Nicolas Luco, Oliver Boyd, Matt Gerstenberger, Ned (Edward) Field, Abbie Leil, John W. van de Lindt

Aftershock risks and the recent events in New Zealand and JapanRecent earthquakes in New Zealand and Japan show that it is important to consider the spatial and temporal distribution of aftershocks following large magnitude events since the probability of high intensity ground motion from...

AHSS through Paraequilibrium Carbon Partitioning and Austenite Stabilization

04 Jan 2011 | Poster | Contributor(s): Gary M Michal

A project developing a third generation of advanced high strength steel (AHSS) is described. The intent is to determine the maximum amount of austenite that can be retained in relatively lean alloys by exploiting the phenomenon of stabilization. Activities and findings in the third year of this...

Alternative Solutions and their probabilities for the model updating of Structural Systems

24 Feb 2011 | Publications | Contributor(s): BORIS ADOLFO ZARATE

  Finite element models are idealistic representations of actual structures. They are built to infer the structural behavior or performance under conditions that usually cannot be reproduced in real structures by either physical or monetary constraints. For instance, they can be used to...

ALUMINUM BUCKLING RESTRAINED BRACES FOR SEISMIC RESISTANCE OF TRUSS MOMENT FRAMES

15 May 2014 | Publications | Contributor(s): Vijay Pal Singh, Durgesh Rai

ALUMINUM CORE BUCKLING RESTRAINED BRACES FOR SEISMIC RESISTANCEThe Buckling restrained brace (BRB) is a special type of brace which does not buckle when loaded in axial compression. Hence, it uses its material yielding capacity in tension as well as in compression to dissipate a much larger...

Amateur video of liquefaction during Earthquake

21 Mar 2011 | Multimedia | Contributor(s): Rajesh Thyagarajan

Amateur video of liquefaction during Earthquake - CNN iReporter Brent Kooi catches the earth moving and cracking beneath his feet as the quake strikes Japan. March 11, 2011.TOHOKU JAPAN EARTHQUAKE & TSUNAMI CLEARINGHOUSE - EERI

Ambassador Program at Howard University overview

11 Apr 2013 | Learning Objects | Contributor(s): Indira Sirjue, Valencia Tayler, Samrakshak Lamichhane, NEES EOT

A power point presentation outlining the activities of the Ambassador Program at Howard University.

Ambient and Forced Vibration Testing of a Reinforced Concrete Building Before and After its Seismic Retrofitting

30 Jul 2012 | Publications | Contributor(s): Serdar Soyoz, Ertugrul Taciroglu, , Robert Nigbor, Derek A Skolnik, ,

Description of the tests and analysis of the data (paper accepted for publication in the ASCE Journal of Structural Engineering)