September 13, 2019

Nonlinear Response of a Structure with Significant Soil-Structure Interaction Effects for Application to Seismic Fragility Evaluation

An important element of structure seismic fragility evaluation for seismic probabilistic risk assessment is determination of the inelastic energy absorption factor. This factor accounts for a structure’s ability to withstand earthquake...

September 13, 2019

Seismic Soil-Structure Interaction Analysis of an Embedded Structure with Partially Bonded Side-Soil

Seismic soil-structure interaction (SSI) analysis is performed for an embedded structure with partially bonded side-soil in support of the seismic probabilistic risk assessment of a nuclear power plant. Adjacent buildings with shallower embedment...

September 13, 2019

Effects of Boundary Conditions on PWR SNF Rod Stiffness and Stresses Under Pinching Loads

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

The effects of rod boundary conditions (BCs) on the stiffness and cladding stresses of pressurized water reactor (PWR) spent nuclear fuel (SNF) rods under pinching loading are investigated. Pinching may occur at the assembly spacer grids during...

Markets:Nuclear
September 13, 2019

Seismic Fragility af Anchored Flat-Bottom Storage Tanks on Ring Foundations

By: Abhinav Anup, Philip Hashimoto, Robert P. Kennedy

Seismic fragility evaluations of anchored flat-bottom storage tanks typically follow the approaches outlined in EPRI (1991) and EPRI (1994a), which are intended for tanks founded on rigid mat foundations. Direct application of these approaches 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...

Markets:Nuclear
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...

August 6, 2019

Survey Level Condition Assessment of Bar-Wrapped and Steel Pipe

By: Murat Engindeniz, Troy Bontrager, David Zavala, Paul Murray

There is a significant amount of AWWA C303 bar-wrapped pipe (BWP) and C200 steel pipe water transmission mains installed across the United States. While condition assessment of aging BWP lines has typically not received as much attention as some...

August 6, 2019

Performance of CFRP-Lined PCCP with Continuing Wire Breakage

By: Murat Engindeniz, Rasko Ojdrovic, Michael P. Gipsov

Washington Suburban Sanitary Commission (WSSC) has been using carbon fiber reinforced polymer (CFRP) liners for repair of prestressed concrete cylinder pipe (PCCP) since mid-2000s. As part of its repair program, WSSC also performs investigations...

August 6, 2019

Rehabilitation of a Critical High-Pressure Transmission Main underneath and in the Vicinity of a Major Highway

By: Murat Engindeniz, Kristen Peterson, Roman Obzejta, Sarah Mathis

The joint transmission main (JTM) is part of the 38 mile long Joint Regional Water Supply System, operated and maintained by the South Coast Water District in California. The pipeline, made of 60 in. diameter PCCP manufactured in early 1960s,...

July 31, 2019

Enhancing the Light – Curved Insulated Glass Unit Design Study

By: Adam Nizich, Sam Baer, Silvia Prandelli, Kelly Burkhart

Curved insulated glass units formed by tempered bending or annealed slumped bending offer a bold expression of architectural design with transparency and energy efficiency. As more skins with complex geometry are built, design teams need to...

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