Ground Improvement Trials Canterbury: Overview

08 Aug 2014 | Contributor(s): Earthquake Commission (EQC)

Hugh Cowan, Director Research, Earthquake Commission, Tom O'Rourke, Professor of Geotechnical Engineering, Cornell University, and Sjoerd van Ballegooy, Senior Geotechnical Engineering, Tonkin &Taylor, discuss the liquefaction process and resulting damage to houses in Christchurch. They provide a...

Robust Integrated Actuator Control: Experimental Verification and Real Time Hybrid Simulation Implementation

06 Aug 2014 | Publications | Contributor(s): Gaby Ou, Ali Irmak Ozdagli, Shirley Dyke, Bin Wu

In this paper we purpose a new actuator control algorithm achieves the design flexibility, robustness and tracking accuracy to give RTHS users the power to achieve highly accurate and robust actuator control. The Robust Integrated Actuator Control (RIAC) strategy integrates three...

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...

Comprehensive Analytical Seismic Fragility of Fire Sprinkler Piping Systems

29 Jul 2014 | Publications | Contributor(s): Siavash Soroushian, Manos Maragakis, Arash E. Zaghi, Alicia Echevarria, Yuan Tian, Andre Filiatrault

Response of a 2-Story Test-Bed Structure for the Seismic Evaluation of Nonstructural Systems

29 Jul 2014 | Publications | Contributor(s): Siavash Soroushian, Manos Maragakis, Arash E. Zaghi, Esmaeel Rahmanishamsi, Ahmad Itani, Gokhan Pekcan

Executive summary for Design of soil and structure compatible yielding to improve system performance (NEES-2009-0732)

29 Jul 2014 | Publications | Contributor(s): Bruce Lloyd Kutter, Tara Hutchinson, Sashi Kunnath, Lijun Deng, Mark Aschheim, Weian Liu, Manny Hakhamaneshi, Andreas Gerasimos Gavras, Mark Stringer, Molly Summers, Jacquelyn Allmond

This document written for NSF summarize general activities, main findings and conclusions of this project.

PhD Dissertation - Rocking Foundations for Building Systems - Effect of Footing Shape, Soil Environment, Embedment and Normalized Moment-to-Shear Ratio, by Manouchehr Hakhamaneshi

29 Jul 2014 | Publications | Contributor(s): Manny Hakhamaneshi

The dissertation written by Manouchehr Hakhamaneshi investigates the use of rocking shallow foundations in building systems, with emphasis on effects of footing shape, soil environment and different normalized moment-to-shear ratios.

Balancing the Beneficial Contributions of Foundation Rocking and Structural Yielding in Moment-Frame and Frame-Wall Building Systems - Weian Liu, PhD Dissertation

29 Jul 2014 | Publications | Contributor(s): Weian Liu

This dissertation written by Weian Liu focuses on improvement of seismic performance of foundation-building systems by investigating (1) their performance with varying foundation moment capacity and (2) the relationship between energy dissipation and re-centering of these systems.

Effect of moment-to-shear ratio on the deformation of rocking shallow foundations - Phase 2 Data Report

29 Jul 2014 | Publications | Contributor(s): Manny Hakhamaneshi, Bruce Lloyd Kutter

Previous research efforts have contributed significantly to the development of the idea ofnonlinear analysis in performance - based evaluation. One of the limitations of the work done byBartlett (1976) and Wiessing (1979), however, is that the experiments were conducted at smallerconfining...

STRAIN LOCALIZATION IN UNSATURATED POROUS MEDIA

29 Jul 2014 | Publications | Contributor(s): Xiaoyu Song

Motivated by new imaging techniques for quantifying density and the degree of saturation in geomaterials at a scale smaller than the specimen, the research presented inthis dissertation formulated and implemented two mathematical frameworks for coupled solid deformation/fluid diffusion in...

In Situ Assessment of the Nonlinear Shear Modulus of Municipal Solid Waste

29 Jul 2014 | Publications | Contributor(s): Dimitrios Zekkos, Andhika Sahadewa, Richard D. Woods, Kenneth Stokoe, Neven Matasovic

Assessment of dynamic properties of Municipal Solid Waste (MSW) is required for seismic response analyses of existing MSW landfills of moderate to high seismicity. While material properties such as shear wave velocity and unit weightcan be readily measured, of nonlinear dynamic properties of MSW...

Shear Wave Velocity Measurements at Municipal Solid Waste Landfills in Michigan

29 Jul 2014 | Publications | Contributor(s): Andhika Sahadewa, Dimitrios Zekkos, Adam Lobbestael, Richard D. Woods

A surface wave based methodology that uses a linear array of 16 geophones and combines active measurements (Multichannel Analysis of Surface Wave technique) and passive measurements (Microtremor Analysis Method) is presented. The methodology is implemented at 13 locations in 4 landfills to...

Hybrid Simulation of the Seismic Response of a Steel Moment Frame Building Structure through Collapse

29 Jul 2014 | Publications | Contributor(s): Maikol Del Carpio

Over the last decade several research projects have focused on the development of analytical tools for collapse assessment of structuralsystems subjected to seismic excitations (Elwood and Moehle, 2003,Sivaselvan and Reinhorn, 2006, Haselton and Deierlein, 2006, Huang and Foutch, 2009, Lignos...

Development of Soil Pressures under Lateral Loading

29 Jul 2014 | Publications | Contributor(s): Anne Lemnitzer, Albert Luan Luu

Paper presented at 10 CUEE CONFERENCE and was part of the PROCEEDINGS 10th International Conference on Urban Earthquake Engineering March 1-2, 2013,Tokyo Institute of Technology, Tokyo, JapanUnderground structures are typical infrastructural components in mega cities around the world and...

Out-of-Plane Dynamic Stability of Unreinforced Masonry Walls Connected to Flexible Diaphragms

29 Jul 2014 | Publications | Contributor(s): Osmar openner@gmail.com Penner

PhD dissertation documenting the entire testing programme in detail. Includes information on specimens, materials, test apparatus, test protocol, observations, and numerical results.The vulnerability of unreinforced masonry (URM) buildings to out-of-planedamage and collapse has been clearly...

Time-domain hybrid formulations for wave simulations in three-dimensional PML-truncated heterogeneous media

29 Jul 2014 | Publications | Contributor(s): arash fathi, Loukas Kallivokas, Babak Poursartip

This paper describes our parallel forward wave simulator for 3D problems.

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29 Jul 2014 | Publications | Contributor(s): Lily Dong

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EXPERIMENTAL EVALUATION OF A 1/3rd SCALE LIGHTLY REINFORCED CONCRETE SLAB UNDER UNIFORM AND CONCENTRATED PUSH DOWN LOAD: EDGE CONDITIONS (Version A)

29 Jul 2014 | Publications | Contributor(s): Cristian Enmanuel Acevedo, Ariel Creagh, Jack Moehle, Wael M. Hassan, Ahmet Can Tanyeri

Tests were conducted on 1/3rd scale older reinforced concrete beam-slab system under support failure scenario. Specimen was an imitation of older RC structure and was detailed according to ACI-318 (1956). Before the push tests were conducted, uniform gravity load of 90 psf was applied on the...

Los Angeles Inventory: Implications for Retrofit Policies for Nonductile Concrete Buildings

29 Jul 2014 | Publications | Contributor(s): Mary Comerio, Thalia Anagnos

Nonductile concrete buildings arguably represent the one of the greatest seismic life safety hazards in many urban centers world-wide because of their collapse potential. This paper discusses the preliminary results of an inventory to evaluate the risk from the approximately 1500 potentially...

Los Angeles Inventory of Nonductile Concrete Buildings for Analysis of Seismic Collapse Risk Hazards

29 Jul 2014 | Publications | Contributor(s): Thalia Anagnos, Mary Comerio, Christine Goulet, H. Na, J. Steele, Jonathan Paul Stewart

Nonductile concrete buildings arguably represent the greatest seismic life safety hazard in many urban centersworld-wide because of their collapse potential. This paper documents the development of an inventory toevaluate the risk from the approximately 1600 potentially nonductile concrete...