The NEES Project Warehouse

22 Nov 2017 | Databases

NEESThe Network for Earthquake Engineering Simulation (NEES) was a National Science Foundation (NSF) funded organization aimed at facilitating research to mitigate earthquake damage and loss of life. The NEEShub cyber infrastructure was developed in response to the NEES community's need to...

Performance-Based Design of Seismically Isolated Bridges

17 Oct 2014 | Publications | Contributor(s): Eric L. Anderson

The response of simple isolated bridge overcrossings to a variety of multi-dimensionalearthquake inputs was investigated by analysis and experiment. These studies wereundertaken as part of the Protective Systems Research Program at UC Berkeley sponsoredby the California Department of...

A PRE-TENSIONED, ROCKING BRIDGE BENT FOR ABC IN SEISMIC REGIONS.

05 Aug 2014 | Publications | Contributor(s): John Stanton, Marc Eberhard, David Sanders, Travis Thonstad, Jeffrey Schaefer, Bryan Kennedy, Olafur Haraldsson, Islam Mantawy

A PRE-TENSIONED, ROCKING BRIDGE BENT FOR ABC IN SEISMIC REGIONS. A new, rocking, pre-tensioned concrete bridge bent system has been developed that reduces on-site construction time by precasting the beams and columns, minimizes post-earthquake residual displacements by the use of locally...

Seismic Protection of Highway Bridges with Negative Stiffness Devices

29 Jul 2014 | Publications | Contributor(s): Navid Attary, Michael Symans, Satish Nagarajaiah, Andrei M Reinhorn, Michael Constantinou, Apostolos Aristotelis Sarlis, Dharma Theja Reddy Pasala, Douglas Taylor

A new control device has been developed and implemented for seismic response control ofhighway bridges. The device produces negative stiffness in a completely passive manner via amechanical mechanism. Numerical simulations and experimental shaking table tests havedemonstrated the effectiveness of...

Centrifuge Modeling of Bridge System with Rocking Footings

29 Jul 2014 | Publications | Contributor(s): Lijun Deng, Bruce Lloyd Kutter, Sashi Kunnath, Thomas Algie

This paper presents centrifuge tests to verify the valisity of a new design method that allows the rocking of spread footings during an earthquake to protect the columns from excessive demand.

Large Soil Confinement Box for Seismic Performance Testing of Geo-Structures

29 Jul 2014 | Publications | Contributor(s): Patrick J. Fox, Andrew Sander, Ahmed Elgamal, Paul Greco, Dan Isaacs, Matthew Stone, Simon Wong

A large soil confinement box (LSCB) has been designed and constructed for seismic performance testing of large-scale geo-structures on the large high performance outdoor shake table (LHPOST) at the University of California-San Diego. The LSCB is a rigid rectangular box with an open roof that...

Performance Evaluation of Negative Stiffness Devices for Seismic Response Control of Bridge Structures via Experimental Shake Table Tests

29 Jul 2014 | Publications | Contributor(s): Navid Attary, Michael Symans, Satish Nagarajaiah, Andrei M Reinhorn, Michael Constantinou, Apostolos Aristotelis Sarlis, Dharma Theja Reddy Pasala, Douglas Taylor

A newly developed passive device that provides negative stiffness has been implemented within a quarter-scale highway bridge model and subjected to seismic loading via shake table testing. Details of the experimental results and their comparison with numerical simulations under a wide range of...

Seismic Protection of Highway Bridges with Negative Stiffness Devices

29 Jul 2014 | Publications | Contributor(s): Navid Attary, Michael Symans, Satish Nagarajaiah, Andrei M Reinhorn, Michael Constantinou, Apostolos Aristotelis Sarlis, Dharma Theja Reddy Pasala, Douglas Taylor

Technical Report MCEER-13-0013:A new control device has been developed and implemented for seismic response control of highway bridges. The device produces negative stiffness in a completely passive manner via a mechanical mechanism. Numerical simulations and experimental shaking table tests have...

Performance Based Implementation of Seismic Protective Devices for Structures

29 Jul 2014 | Publications | Contributor(s): Wang Xi

In order to improve the seismic performance of structures and to reduce the total cost (both direct and indirect) due to earthquake damages, structural control through seismic protective devices in either passive or semi-active forms is essential to achieve the desired performance goals. This...

New structural system could help concrete bridges withstand earthquakes

16 Jul 2014 | Notes | Contributor(s): Marti LaChance

ASCE Smartbrief | July 16, 2014 | Weekly newsletter for ASCE members

New Concrete Bridge Bent System may Minimize Seismic Damage

15 Jul 2014 | Notes | Contributor(s): Marti LaChance

ENR.com Engineering News-Record  | July 7, 2014 | Magazine, online magazine

Team Tests ABC System With Earthquake Resistance

15 Jul 2014 | Notes | Contributor(s): Marti LaChance

ASCE Civil Engineering Magazine | July 15, 2014 | Online magazine article about NEES bridge bent research at University of Nevada, Reno.

MEASURES DEVELOPED IN JAPAN AFTER THE 1964 NIIGATA EARTHQUAKE TO COUNTER THE LIQUEFACTION OF SOIL

10 Jul 2014 | Publications | Contributor(s): K. Harada, S. Yasuda

MEASURES DEVELOPED IN JAPAN AFTER THE 1964 NIIGATA EARTHQUAKE TO COUNTER THE LIQUEFACTION OF SOIL In Japan, many remediation methods against liquefaction have been developed since the 1964 Niigata Earthquake, which caused severe damage to structures due to liquefaction. The methods are classified...

New bridge design improves earthquake resistance, reduces damage, and speeds construction

02 Jul 2014 | Notes | Contributor(s): Marti LaChance

Reddit Engineering | July 2, 2014 | Online engineering forum. 3 Commnents, 97% upvoted.

New Bridge Design Improves Earthquake Resistance

02 Jul 2014 | Notes | Contributor(s): Marti LaChance

Engineering.com | July 2, 2014 | Online magazine story with 1840 views, 7 FB Likes, and 14 Tweets

New Bridge Design Improves Earthquake Resistance, Reduces Damage And Speeds Construction

01 Jul 2014 | Notes | Contributor(s): Marti LaChance

ScienceNewsline | July 1, 2014 | Online magazine

New bridge design improves earthquake resistance, reduces damage, and speeds construction

01 Jul 2014 | Notes | Contributor(s): Marti LaChance

ScienceDaily | July 1, 2014 | Online magazine

New bridge design improves earthquake resistance, reduces damage, and speeds construction

30 Jun 2014 | Notes | Contributor(s): Marti LaChance

NSF News from the Field | June 30, 2014 | Mobile news website

Soil-Structure Interaction Analysis of the Manhattan Bridge Foundations

15 May 2014 | Publications | Contributor(s): Lelio Mejia, Rajendram Arulnathan, Sathish Murugaiah, Thomas Thomann

Soil-Structure Interaction Analysis of the Manhattan Bridge FoundationsThe seismic evaluation of long-span bridges typically requires consideration of dynamic soil-structure interaction (SSI) effects on the seismic response of such bridges. Dynamic SSI effects depend primarily on the bridge...

Improved distribution probability models for seismic fragility assessment

15 May 2014 | Publications | Contributor(s): Jianjun Qin, Kevin R. Mackie, Bozidar Stojadinovic

Improved probability models for seismic fragility assessmentThe Pacific Earthquake Engineering Research Center (PEER) framework to assess the seismic performance of individual structure subject to seismic hazard disaggregates the problem into seismic intensity, engineering demand, damage, and...