January 2, 2020

Cutting Prestressed Concrete Framing

This article examines the structural considerations of modifying existing PC floor elements and provides a case study where these methods were used successfully. The focus is on simply supported tee beams with fully bonded strands. It is...

December 2, 2019

Effects of the Improper Modeling of Viscous Damping on the First‐mode and Higher‐mode Dominated Responses of Base‐isolated Buildings

By: Ricardo Medina, Hamidreza Anajafi, Erin Santini‐Bell

In many finite element platforms, a classical global damping matrix based on the elastic stiffness of the system (including isolators) is usually developed as part of the solution to the equations of motion of base‐isolated buildings. The...

November 27, 2019

Seismic Risk Assessments and Due Diligence Studies

Recognizing the potential threat of earthquakes, many building owners and property managers seek seismic risk assessments (also called seismic due diligence studies) to understand the condition of structures they currently own or intend to purchase.
November 14, 2019

A Probabilistic Assessment of PWR SNF Cladding Pinching Failure Considering Potential Transportation Accident Conditions

By: Ricardo Medina, Elmar Eidelpes, Luis Ibarra

This study presents a probabilistic assessment of pressurized water reactor (PWR) spent nuclear fuel (SNF) rod cladding pinching failure triggered by a transportation accident, after 300 years of dry storage. Three thousand pinching scenarios,...

Markets:Nuclear
October 22, 2019

Excavation Risks Adjacent to Existing Structures in Illinois and Urban Environments – Identifying and Managing Technical and Legal Issues

By: Scott DiFiore, Matthew Johnson, Gregory Meeder, James Chivilo

New construction in metropolitan areas has direct impacts on immediate neighbors and abutters. While noise and dust are generally nuisance concerns, demolition, vibrations, excavation, and dewatering can cause structural damage to...

October 22, 2019

Identifying Waterfront Design Solutions for Urban Resilience

Located in harsh marine environments, coastal and waterfront developments require special attention to improve resilience over the project’s design life. Material selection, siting questions, protective coatings, waterproofing detailing, and drainage are all important considerations for the design team.
October 21, 2019

Building Enclosure Design of Exterior Soffits

Commercial building designs have long incorporated exterior soffits, better known outside of the building design and construction industry as the underside of any projecting building feature. Aside from soffits at the eave or rake edges of a...

October 17, 2019

Using Computer Automation to Simplify Seismic Evaluation of Existing Buildings

By: Kevin Moore, Pearl Ranchal, Ayush Singhania

Several commercially available software packages automate the structural design process for new buildings, allowing engineers to deliver projects with unparalleled efficiency. These software packages contain structural engineering standards (e.g...

October 17, 2019

San Francisco Nonductile Concrete Buildings Part I: Building Inventory

By: Keith Palmer, Pearl Ranchal, Kari Klaboe, Duke Crestfield, Stephen Kadysiewski, Laurence Kornfield, Robert Kraus

Over the years, there has been much focus within California on seismically vulnerable building types, with the ultimate goal being to reduce life safety risks, improve community resiliency, or achieve a balance of both objectives. In San...

October 17, 2019

Existing Buildings and the “10% Rule”: Survey Results, Opinions, and Recommendations

By: Kevin OConnell, Russell McLellan, Daniel Zepeda, Garrett Hagen, Jonathan Buckalew, Ali Sumer

Additions, alterations, and voluntary seismic improvements to existing buildings can be challenging to implement in California. Our 2018 paper presented this issue and surveyed engineers throughout the state to determine if there is uniformity in...

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