James M Ricles - Academia.edu (original) (raw)

Papers by James M Ricles

... level of per-formance and quality of construction of some of the so-called seismic-resistantb... more ... level of per-formance and quality of construction of some of the so-called seismic-resistantbuildings need to ... 2 (b) is approximately drawn out between Fig ... maximum seismic intensity during the 50-year refer-ence period has been obtained through the seismic risk analysis, then ...

Second International Conference on Composites in InfrastructureNational Science Foundation, 1998

Abstract: The use of fiber reinforced polymer composite (FRPC) jackets to retrofit or rehabilitat... more Abstract: The use of fiber reinforced polymer composite (FRPC) jackets to retrofit or rehabilitate reinforced concrete columns is presented. The axial stress-strain behavior of passively confined concrete is presented focussing on parameters affecting the design of ...

Journal of Composites for Construction, Nov 1, 2001

This paper presents the results of an experimental investigation of the axial behavior of small-s... more This paper presents the results of an experimental investigation of the axial behavior of small-scale circular and square plain concrete specimens and large-scale circular and square reinforced concrete columns confined with fiber reinforced polymer (FRP) composite ...

Title: Performance-Based Design and Real-Time Large-Scale T... more Title: Performance-Based Design and Real-Time Large-Scale Testing to Enable Implementation of Advanced Damping Systems (NEES-2008-0648) Year Of Curation: 2013 Description: Advanced structural damping systems such as magnetorheological (MR) dampers have great potential improve our ability to achieve performance-based structural design (PBD) directed towards seismic resilience. However, developing methods for real-time hybrid (RTH) testing of these systems is essential to enable the validation of these approaches. In this NEESR project, large-scale structural models, controlled with MR devices are being tested at the Lehigh RTMD NEES Equipment Site using RTH techniques. Award: http://www.nsf.gov/awardsearch/showAward?AWD_ID=1011534 PIs & CoPIs: Shirley Dyke, Anil Agrawal, Richard Christenson, James Ricles, Billie Spencer Dates: September 01, 2008 - June 22, 2012 Organizations: -- Facilities: Lehigh University, PA, United States, University of Illinois at Urbana-Champaign, IL, United States Sponsor: NSF - 1011534 Keywords: Supplemental damping,Seismic protective system,Damping device,Large-scale validation testing,Structural response/behavior modification Publications: "Comparison of 200 KN MR Damper Models for use in Real-time Hybrid Simulation" "Development of a Large-Scale MR Damper Model for Seismic Hazard Mitigation Assessment of Structures" "Accommodating MR Damper Dynamics for Contr [...]

Structural control & health monitoring, Mar 8, 2018

Cladding systems are conventionally designed to serve architectural purposes and protect occupant... more Cladding systems are conventionally designed to serve architectural purposes and protect occupants from the environment. Some research has been conducted in altering the cladding system in order to provide additional protection against natural and man-made hazards. The vast majority of these solutions are passive energy dissipators, applicable to the mitigation of single types of hazards. In this paper, we propose a novel semiactive variable friction device that could act as a connector linking a cladding panel to the structural system. Because of its semi-active capabilities, the device, here termed variable friction cladding connection (VFCC), could be utilized to mitigate different hazards, either considered individually or combined, also known as multi-hazards. The VFCC consists of two sets of sliding friction plates onto which a variable normal force can be applied through an actuated toggle system. A static model is derived to relate the device's Coulomb friction force to the actuator stroke. This model is integrated into a dynamic friction model to characterize the device's dynamic behavior. A prototype of the VFCC is constructed using 3D printing. The prototype is tested under harmonic excitations to identify the model parameters and characterized on a set of nonstationary excitations under different actuator stroke lengths. Results show good agreement between the model and experimental data, demonstrating that the device functions as-designed.

Earthquake Engineering & Structural Dynamics

In light of the significant damage observed after earthquakes in Japan and New Zealand, enhanced ... more In light of the significant damage observed after earthquakes in Japan and New Zealand, enhanced performing seismic force‐resisting systems and energy dissipation devices are increasingly being utilized in buildings. Numerical models are needed to estimate the seismic response of these systems for seismic design or assessment. While there have been studies on modeling uncertainty, selecting the model features most important to response can remain ambiguous, especially if the structure employs less well‐established lateral force‐resisting systems and components. Herein, a global sensitivity analysis was used to address modeling uncertainty in specimens with elastic spines and force‐limiting connections (FLCs) physically tested at full‐scale at the E‐Defense shake table in Japan. Modeling uncertainty was addressed for both model class and model parameter uncertainty by varying primary models to develop several secondary models according to pre‐established uncertainty groups. Numerical...

Frontiers in Built Environment

Lecture Notes in Civil Engineering

Annual Stability Conference Structural Stability Research Council 2021, SSRC 2021, 2021

Frontiers in Built Environment, 2020

The NHERI Lehigh Experimental Facility, as part of the NSF-funded Natural Hazards Engineering Res... more The NHERI Lehigh Experimental Facility, as part of the NSF-funded Natural Hazards Engineering Research Infrastructure (NHERI) program, was established in 2016 as an open-access facility. This facility enables researchers to conduct state-of-art research on natural hazard mitigation in civil infrastructure systems, including high-performance numerical and physical testing to improve the resilience and sustainability of the civil infrastructure against natural hazards. The facility has the unique ability to conduct real-time multi-directional hybrid simulation (RTHS) on large-scale structural systems using 3D non-linear numerical models combined with large-scale physical models of structural and non-structural components. The Lehigh Experimental Facility possesses testbeds that include a lateral load-resisting system characterization testbed, a non-structural component multi-directional dynamic loading simulator, full-scale and reduced-scale damper testbeds, a tsunami and storm surge debris impact force testbed, and a soil-foundation structure interaction testbed. This paper describes the infrastructure and capabilities of the NHERI Lehigh Experimental Facility. Developments by the facility in advancing large-scale RTHS are detailed. Examples of research projects performed by users of the facility are then provided, including large-scale RTHS of steel frame buildings with magneto-rheological (MR) dampers and non-linear viscous dampers subject to strong earthquake ground motions; 3D multi-hazard large-scale RTHS of tall steel buildings subject to multi-directional wind and earthquake ground motions; characterization of a novel semi-active friction device based on band brake technology; and testing of cross-laminated timber self-centering coupled wall-floor diaphragm-gravity systems involving multi-directional loading.

With global urbanization trends, the demands for tall residential and mixeduse buildings in the r... more With global urbanization trends, the demands for tall residential and mixeduse buildings in the range of 8~20 stories are increasing. One new structural system in this height range are tall wood buildings which have been built in select locations around the world using a relatively new heavy timber structural material known as cross laminated timber (CLT). With its relatively light weight, there is consensus amongst the global wood seismic research and practitioner community that tall wood buildings have a substantial potential to become a key solution to building future seismically resilient cities. This paper introduces the NHERI Tallwood Project recentely funded by the U.S. National Science Fundation to develop and validate a seismic design methodology for tall wood buildings that incorporates high-performance structural and nonstructural systems and can quantitatively account for building resilience. This will be accomplished through a series of research tasks planned over a 4-y...

Drywall partition walls (DPW) could considerably affect the seismic resilience of tall crosslamin... more Drywall partition walls (DPW) could considerably affect the seismic resilience of tall crosslaminated timber (CLT) buildings due to cost and building downtime associated with repair. These drift sensitive components are susceptible to damage at low shaking intensities, and thus controlling or eliminating such damage in low to moderate earthquakes is key to seismic resilience. Conversely, post-tensioned CLT rocking walls have been shown to be a resilient lateral load resistant system for tall CLT building in high seismic areas. A series of tests will be performed at the NHERI Lehigh EF to compare the performance of DPWs with conventional slip-track detailing and alternative telescoping slip-track detailing (track-within-a-track deflection assembly), and to evaluate different approaches for minimizing damage at the wall intersections through the use of gaps. Moreover, a configuration is examined with partition wall encapsulating the rocking wall for fire protection. This paper present...

This paper presents an overview of a newly-initiated research program on seismic collectors in st... more This paper presents an overview of a newly-initiated research program on seismic collectors in steel building structures. Seismic collectors are elements that bring inertial forces to the primary vertical-plane elements of the Seismic Force-Resisting System. Due to the reversing nature of earthquake loads, collectors must alternately carry tension and compression. Collector failure is potentially catastrophic, yet little research has focused on collectors, and both the seismic behavior and demands on these elements are not well understood. Instead, current design code provisions rely on amplified collector design forces. This paper presents the plans of a research program that will use nonlinear analysis of steel collector elements in steel composite floor systems, supported by: (1) large-scale testing of isolated collector elements and connections at the NHERI Lehigh Experimental Facility; and (2) shake table testing of a single-story steel composite floor system at the NHERI UCSD ...

Proceedings of the 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2013), 2014

Post-tensioned, steel, rocking concentrically braced frames (also known as selfcentering concentr... more Post-tensioned, steel, rocking concentrically braced frames (also known as selfcentering concentrically braced frames or SC-CBFs) are a new type of seismic lateral force resisting system that reduces or eliminates the damage and residual drift often associated with conventional concentrically-braced frames (CBFs) under design level earthquakes. The SC-CBF is made up of a CBF whose column bases are not anchored to the foundation (they are free to uplift), post-tensioning steel that runs vertically over the height of the SC-CBF to prestress the SC-CBF to the foundation and some sort of energy dissipation device. The SC-CBF eliminates the damage to the CBF members under design level earthquakes by limiting the base overturning moment that can develop and then keeping the members nominally elastic. The maximum base overturning moment is limited by allowing the SC-CBF to rock on its foundation and yielding of the post-tensioning steel. The residual drift is reduced or eliminated under design level earthquakes by a prestressing force from the post-tensioning steel running vertically over the height of the SC-CBF. The prestressing force provides a restoring overturning moment that returns the SC-CBF to its original undisplaced state after the earthquake.