MCEER Publications - Printable Version

MCEER Publications - Printable Version

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RE: MCEER Publications - pezhmankhan - 03-27-2013

Experimental Seismic Evaluation, Model Parameterization, and Effects of Cold-Formed Steel-Framed Gypsum Partition Walls on the Seismic Performance of an Essential Facility

The contribution of nonstructural partition walls is often assumed to be negligible in the lateral response of common seismic force-resisting systems. However, this assumption may become nonconservative as the sum effect of individual wall systems is considered. The first phase of the NEES Nonstructural Grand Challenge Project tested full scale cold-formed steel-framed gypsum partition walls using the University at Buffalo Nonstructural Component Simulator (UB-NCS). A description and experimental results for 22 different partition wall configurations is given. Included in the wall variations is material type, connections, testing protocols, wall dimensions, and boundary conditions. Innovative designs to reduce the seismic fragility of partition walls were also developed as part of the testing program. The experimental data are used to populate an extensive seismic fragility database for cold-formed steelframed gypsum partition walls. Parameters for a tri-linear hysteretic model, aimed at reproducing the inplane mechanical behavior of partition walls, are determined from the experimentally obtained forcedisplacement curves. Recommended parameters for in-plane walls are given for individual configurations and cold-formed steel-framed nonstructural partition walls. The calibrated partition wall models are combined with the structural model of an existing four-story steel moment-resisting frame medical facility to demonstrate the effect on dynamic properties. As the period of the structure reduces due to the increased stiffness from the partition wall systems, reductions in drift and absolute floor accelerations are observed. The assumption that these wall systems have negligible impact is disproven by the use of incremental dynamic analyses performed according to the FEMA P695 methodology. These analyses show that including the contribution of steel stud gypsum partition walls to the lateral force-resisting system increases the building collapse safety margin by 32%.

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RE: MCEER Publications - pezhmankhan - 03-28-2013

Design of Highway Bridges Against Extreme Hazard Events: Issues, Principles and Approaches

Major national and manmade disasters such as earthquakes, hurricanes, accidents and even intentional attacks can affect highway bridges, interfering with rescue and recovery operations and the daily economic activity of the area served by the affected bridge. To mitigate the impact of the loss or closing of highway bridges, multi-hazard design principles and guidelines are needed.

This report is the first in a series dedicated to exploring the key issues and challenges facing the bridge community in developing multi-hazard design principles for highway bridges. The eight contributors offer perspectives from academia, private practice and government agencies, that can serve as the basis for the development of a comprehensive research agenda in this important area.

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RE: MCEER Publications - Sumatra - 03-29-2013

Dear Members,
Post #8 entitled Performance of Seismic Isolation Hardware under Service and Seismic Loading is now a deadlink. Please kindly re-upload.

Many thanks in advance.

RE: MCEER Publications - pezhmankhan - 03-29-2013

Seismic Isolation of Highway Bridges:

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Performance of Seismic Isolation Hardware under Service and Seismic Loading:

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RE: MCEER Publications - pezhmankhan - 04-07-2013

Property Modification Factors for Seismic Isolation Bearings:

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Passive Energy Dissipation Systems for Structural Design and Retrofit:

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Principles and Performance of Roller Seismic Isolation Bearings for Highway Bridges - pezhmankhan - 04-07-2013

Principles and Performance of Roller Seismic Isolation Bearings for Highway Bridges

This report presents a new roller seismic isolation bearing for use in highway bridges. This new bearing uses rolling motions of cylindrical rollers between sloping surfaces to achieve seismic isolation. The bearing is characterized by a constant spectral acceleration under horizontal ground motions and by a self-centering capability, which are two desirable properties for seismic applications. The former ensures that resonance between the bearing and horizontal earthquakes will not occur while the latter guarantees the bridge superstructure can self-center to its original position after an earthquake. Analytical models for the bearings under vertical loading and horizontal and vertical ground motions are derived and validated with results from finite element analyses and experimental studies. To decrease the displacement responses of the bearing and to maintain a constant spectral acceleration response while keeping the cost of the bearing low, sliding friction devices are integrated into a roller bearing. The seismic behavior of this new seismic isolation bearing with different design parameters under various ground motions is analytically studied. The parameters include the sloping angle, the sliding friction force and the PGA levels. Two prototype roller seismic isolation bearings have been developed and their design details are presented in this report. The first prototype bearing does not have any built-in friction devices, while the second prototype bearing has a unique built-in feature to achieve supplemental energy dissipation through sliding friction. The last part of the report presents a design example of the second prototype roller seismic isolation bearing to be used in a bridge in a region of high seismicity.

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RE: MCEER Publications - pezhmankhan - 11-11-2013

Seismic Retrofitting Manual for Highway Structures: Part 1 - Bridges

This report maintains the basic format of the retrofitting process described in the 1995 report, major changes have been made in this revision to include current advances in earthquake engineering, field experience with retrofitting highway bridges, and the performance of bridges in recent earthquakes in California and elsewhere. It is the result of several years of research with contributions from a multidisciplinary team of researchers and practitioners.

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Seismic Retrofitting Manual for Highway Structures: Part 2 - Retaining Structures, Slopes, Tunnels, Culverts and Roadways

This report focuses on seismic vulnerability screening, evaluation and retrofitting of the following highway system components: retaining structures, slopes, tunnels, culverts, and roadways. It is the first known effort to capture, in a formal and consistent manner, the important aspects of seismic performance and retrofitting intended to improve performance of highway system structural components other than bridges.

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RE: MCEER Publications - pezhmankhan - 11-18-2014

Design Recommendations for Perforated Steel Plate Shear Walls

An analytical study using the finite element program ABAQUS/Standard was performed to investigate the behavior of unstiffened thin steel plate shear walls (SPSW) having openings on the infill plate under monotonic pushover displacement. To accommodate the passage of utilities, two designs proposed by Vian, namely the perforated infill plate and the cutout corner SPSW, are revisited to investigate and resolve some concerns reported by Vian.

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Steel Plate Shear Walls for Seismic Design and Retrofit of Building Structures

Steel plate shear walls (SPSWs) are investigated in this report, for use in retrofit and new design as a lateral force resisting system in building structures. Limits for sizing (for moment strength) of anchor beams, at the upper and lowermost levels of a multi-story SPSW frame, are introduced and developed. Approximate limits for frame drift at yield are developed for both a bare frame, and including an SPSW, with the intention of designing the infill panel as a “fuse” to yield and dissipate seismic input energy while protecting the surrounding framing.

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RE: MCEER Publications - pezhmankhan - 11-20-2014

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RE: MCEER Publications - bridgeengineer - 11-20-2014

Dear members-pezhmankhan,
Please upload again:

Seismic Isolation of Highway Bridges
Recommended LRFD Guidelines for the Seismic Design of Highway Bridges

regards
bridgeengineer