September 13, 2019

Partial Correlation and Dependence Between Seismic Fragilities of Multiple Adjacent Structures with Significant Soil-Structure-Interaction Effects

By: Mohamed Talaat, Robert P. Kennedy

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. The fragility analysis develops...

September 13, 2019

Case Study: Cable Tray Seismic Fragility Evaluation Involving Ductile Failure of a Cold-Formed Steel Section in Flexure

This paper presents a case study for a recent seismic fragility evaluation of cable trays at a nuclear power plant in the United States. The evaluation was initiated due to the presence of non-serrated strut nuts in cable tray supports throughout...

September 13, 2019

Reinforced Concrete Shear Wall Capacity Advances

Seismic PRAs have become more common in the nuclear power industry following the Fukushima accident caused by the 2011 earthquake and tsunami. In order to provide best estimates of the risk, the seismic fragilities should be as realistic as...

September 13, 2019

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

By: Philip Hashimoto, Juan Jimenez-Chong, David Nakaki, Robert P. Kennedy

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

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

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...

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...

July 31, 2019

Enhanced Effective Thickness Method for Cantilevered Laminated Glass Balustrades

By: Adam Nizich, Laura Galuppi

Cantilevered laminated glass balustrades supported by bearing in continuous base shoes are among the most ordinary applications of structural glass. The performance of laminated glass is commonly approximated with the Effective Thickness Method...