A New Look at Strain Limits and Plastic Hinge Lengths for Reinforced Concrete Bridge Columns

15 May 2014 | Contributor(s): Mervyn Kowalsky, James Nau, Chad Goodnight

A New Look at Strain Limits and Plastic Hinge Lengths for Reinforced Concrete Bridge Columns as Impacted by Loading HistoryThis paper discusses a research program supported by the Alaska Department of Transportation and Alaska University Transportation Center aimed at defining accurate limit...

A New Method of Shaking Table Test Overcoming the Law of Similarity on Reduced Steel Frame

15 May 2014 | Contributor(s): Yuko Shimada, Satoshi Yamada

A New Method of Shaking Table Test Overcoming the Law of Similarity on Reduced Steel FrameIt is important to grasp collapse behaviors of buildings in order to evaluate seismic safety of buildings. Full-scale shaking table test is the most effective way to examine collapse behaviors of buildings....

A new nonlinear system for three-dimensional isolation of vibrations in structures and equipment

15 May 2014 | Contributor(s): José Luis Almazán

A new nonlinear system for three-dimensional isolation of vibrations in structures and equipmentAll equipment or structure is permanently subjected to vibrations from their environment. This becomes more relevant when it comes to specialized equipment of great value by itself or by its content....

A New Perspective on the Tensile Strength of Lap Splices in Reinforced Concrete Members

30 Jul 2012 | Contributor(s): Brian Richter

Current U.S. design provisions for lap splices of deformed bars in tension were developed primarily from tests conducted on beams with lap lengths not exceeding 40 bar diameters. But the provisions often require splices to be longer than 40 bar diameters. Recent structural failures have indicated...

A new shear strength design formula for confined masonry walls: proposal for the Mexican code

15 May 2014 | Contributor(s): J J Perez-Gavilan, Leonardo Flores, Antonio Manzano

A new shear strength design formula for confined masonry walls: proposal for the Mexican codeBased on new experimental evidence a new formula to estimate the cracking due to tension shear strength of confined masonry walls is proposed. The new expression includes the influence of aspect ratio and...

A Novel Variable Friction Device for Natural Hazard Mitigation

15 May 2014 | Contributor(s): Simon Laflamme, Austin Downey, Liang Cao, James Ricles, Douglas Taylor

Novel Variable Friction Device for Natural Hazard MitigationImplementation of high performance damping devices can increase cost-effectiveness of structural systems for mitigation of natural hazards. However, the applications of these damping systems are limited, due to a lack of 1) mechanical...

A one-step Newmark model for probabilistic analysis of seismic slope displacements

15 May 2014 | Contributor(s): Gang Wang, Wenqi Du

A fully probabilistic framework for spatially distributed slope systems using vector intensity measuresEarthquake-induced slope displacement is an important parameter for safety evaluation and earthquake design of slope systems. Traditional probabilistic seismic hazard analysis (PSHA) usually...

A Parametric Statistical Generalization of Uniform-Hazard Earthquake Ground Motions

29 Oct 2010 | Publications | Contributor(s): Bryce Dickinson, Henri Gavin

Sets of ground motion records used for seismic hazard analyses typically have intensity measures corresponding to a particular hazard level for a site (perhaps conditioned on a particular intensity value and hazard). In many cases the number of available ground motions that match required...

A Parametric Study on Earthquake Behaviour of Masonry Minarets

15 May 2014 | Publications | Contributor(s): Eser Cakti, Ozden Saygili, Carlos Oliveira, Jose Lemos

A Parametric Study on Earthquake Behaviour of Masonry MinaretsMinarets are important elements of mosques that constitute the essence of İslamic art. They are tall and slender structures. Old ones are mostly made of cut-stone-block masonry and occasionally of brick masonry, while the new ones...

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...

A Real Time Hybrid Simulation Demo Code

15 Aug 2013 | Computational Models | Contributor(s): Ge(Gaby) Ou, Shirley Dyke

 This is an RTHS simulation example including codes ‘RTHS_DM.mdl’ and ‘Trigger_RTHS_DM.m’.  In this example, the concept of RTHS and its representation in simulation is discussed. A single story steel structure with predetermined mass, stiffness, damping ratio is...

A Real Time Hybrid Simulation Demo Code for a Structure with Base Isolation

09 Jun 2014 | Computational Models | Contributor(s): Daniel Gomez, Rachel Chicchi, Scott Wonderly, Shirley Dyke

This demo describes the set-up of a simple RTHS simulation with base isolation and is accompanied by two files BI_RTHS_simul.mdl and BI_RTHS_DM.m. BI_RTHS_simul.mdl is a Matlab Simulink® code that uses a block environment to simulate the model response. This...

A REMARKABLE METHOD TO STOP THE DIFFERENTIAL SETTLEMENTS OF HISTORIC BUILDINGS

15 May 2014 | Publications | Contributor(s): Ion Vlad

A REMARKABLE METHOD TO STOP THE DIFFERENTIAL SETTLEMENTS OF HISTORIC BUILDINGSAs the general awareness of the earthquake risk increases and the standards of protection for new buildings become higher, the safety of the older, less earthquake resistant ones, becomes an increasingly important...

A Rocking Spine for Enhanced Seismic Performance of Reinforced Concrete Frame Buildings with Infills

15 May 2014 | Publications | Contributor(s): Henry Burton, Gregory Deierlein

A Rocking Spine for Enhanced Seismic Performance of Reinforced Concrete Frame Buildings with Masonry Infills: Concept Development and Design GuidelinesThis research aims to develop a novel approach to improving collapse safety in reinforced concrete frames with infills through the use of strong,...

A SIMPLE LINEAR RESPONSE HISTORY ANALYSIS PROCEDURE FOR BUILDING CODES

15 May 2014 | Publications | Contributor(s): Kevin Aswegan, Finley Charney

A SIMPLE LINEAR RESPONSE HISTORY ANALYSIS PROCEDURE FOR BUILDING CODESThis paper describes a Linear Response History (LRH) analysis procedure that is intended as an alternate to the Linear Modal Response Spectrum approach that is currently part of Chapter 12 of ASCE 7-10. The main motivation for...

A Simplified Approach to Quantify Damage Contribution of Individual Events in Canterbury Earthquake Sequence

15 May 2014 | Publications | Contributor(s): Can Simsir, Behnam Arya, Anurag Jain

A Simplified Approach to Quantify Damage Contribution of Individual Events in Canterbury Earthquake SequenceThis paper presents an approach to quantify the individual contribution of four major earthquakes in the Canterbury earthquake sequence of 2010-2011 to the overall damage caused to...

A SIMPLIFIED METHOD FOR THE ESTIMATION OF THE SEISMIC RESISTANCE OF RC FRAMES WITH WEAK INFILL PANELS

15 May 2014 | Publications | Contributor(s): Austin Reese, Andreas Stavridis

A Simplified Analytical Tool for Infilled RC Frames Subjected to Seismic LoadingReinforced concrete (RC) frames with masonry infill panels are widely used in areas with high seismic activity around the world. Historically, the masonry infills have been considered nonstructural elements and have...

A simplified model for estimating axial impact forces resulting from debris with nonstructural mass

29 Jul 2015 | Publications | Contributor(s): payam piran aghl, H. Ronald Riggs, Clay Naito

This study is aimed to develop a simplified one-dimensional model to predict impact force and duration for axial impact of debris with non-uniformly distributed nonstructural mass.

A strategy of fracture path/earthquake prediction by using modified data assimilation technology

15 May 2014 | Publications | Contributor(s): Hao Chen, Lalith Wijerathne, Muneo Hori

A strategy of fracture path/earthquake prediction by using modified data assimilation technologyTaking advantage of the progress of computer hardware and software and the improvement of observation technology, there is an increasing possibility of earthquake prediction by means of numerical...

A Structural Health Monitoring Framework for Civil Structures

19 Jul 2011 | Publications | Contributor(s): Diego Giraldo

A health monitoring framework that detects and localizes damage in civil structures is proposed in this dissertation. Dynamic measurements of the systems as they vibrate under the influence of ambient and service loads are used to characterize the structural condition at any given time....