October 17, 2019

Suggested Improvements on Mandatory Wood “Soft Story” Retrofits

By: Russell McLellan, Keith Palmer, Kenneth Tam, Daniel Zepeda, Michael Mehrain, Garrett Hagen, Jonathan Buckalew, Milad Oliaee

The “soft story” wood frame retrofit ordinances adopted by many California cities including Los Angeles and San Francisco are the largest of their kind. These ordinances mitigate a deficiency known to cause collapse in past...

September 26, 2019

Combating Condensation at the National Air and Space Museum

By: Brian Rose, Richard Renaud

This article discusses the condensation analysis and CFD modeling that SGH performed for the ongoing revitalization project at the National Air and Space Museum.

It is ...

September 26, 2019

Energy, Hygrothermal, and Freeze-Thaw Considerations for Insulating Mass Masonry Walls

This paper discusses energy modeling and previous research regarding freeze-thaw masonry deterioration to challenge common assumptions about the benefits and risks of insulating masonry walls.

It is...

September 13, 2019

A Hybrid SSI Analysis Method for Embedded and Partially Bonded Rigid Foundations

By: David Nakaki, Mohamed Talaat, Juan Jimenez-Chong, Cameron Samuelson-Sanford, James J. Johnson, Oleg R. Maslenikov

CLASSI and SASSI are two sub-structuring approaches to analyze the phenomena of soil-structure interaction (SSI) with extensive applications in the nuclear power industry. Many similarities exist in the two methods; both approaches treat the SSI...

September 13, 2019

Seismic Fragility Evaluation of Metal Flat-Bottom Storage Tanks with Short Anchor Bolt Chairs

By: Abhinav Anup, Ho Jung Lee, Philip Hashimoto, Robert P. Kennedy

Seismic fragilities of anchored metal flat-bottom storage tanks are usually governed by tank overturning. Tank overturning capacity is typically influenced more by the hold-down strength of the anchors rather than the buckling strength of the...

September 13, 2019

Equipment Capacities from Earthquake Experience Data for Use in Fragility Calculations

Electric Power Research Institute (EPRI) has recently researched the development of refined equipment capacities from earthquake experience data for use in fragility calculations, which is a key component of nuclear seismic probabilistic risk...

September 13, 2019

Risk-Consistent Vertical Ground Motion Spectra for Seismic Probabilistic Risk Assessment

Seismic Probabilistic Risk Assessment (SPRA) of nuclear power plants (NPPs) is typically performed using three major analysis components: probabilistic seismic hazard, seismic fragility, and plant response analyses. The seismic hazard output is...

September 13, 2019

Case Study Investigating Probabilistic and Deterministic Sampling Methods for Developing In-Structure Response Spectra: Phase II

By: Riccardo Cappa, Andrew Appelbaum, Frederic Grant

The goal of this ongoing, multi-phase research project is to assess the accuracy of simplified deterministic sampling methods used in practice to estimate seismic structural response compared to more rigorous probabilistic sampling approaches....

September 13, 2019

A Probabilistic Assessment of PWR SNF Rod Pinching Failure Considering Hydride-Related Cladding Embrittlement

By: Ricardo Medina, Elmar Eidelpes, Luis F. Ibarra

A probabilistic assessment of the likelihood of PWR SNF rod failure considering hydride-related cladding embrittlement after dry storage cool-down of 300 years is presented. The investigated rod failure mechanism is cladding cracking caused by...

September 13, 2019

Numerical Simulation of a Transportation Cask and Transmissibility due to 0.3 M Drop

By: Ricardo Medina, Shokoufeh Zargar, Luis F. Ibarra

In the absence of experimental and measured data, a reliable numerical model is needed to predict the performance of fuel assemblies after extended storage, including acceleration and strain of fuel rods due to impact and vibration, and quantify...