July 29, 2019

Damping modification factor for elastic floor spectra

By: Ricardo Medina, Hamidreza Anajafi

Nonstructural components (NSCs) housed in building structures are subject to semi-narrow band excitations generated via filtering of the ground motion by the supporting building. NSC design forces are generally provided based on adopting a 5% NSC...

July 16, 2019

Three Technologies to Watch in Fire, Life Safety

Many new fire and life safety technologies and innovations remain notable, and they may yet achieve greater use and application in the future. It is possible that some or all of them have achieved greater use in a specific market. There are...

July 1, 2019

Revisiting Earthquake Lessons - Non-ductile Concrete

The Richter magnitude 6.7 San Fernando Earthquake occurred on the morning of February 9, 1971 in the San Fernando Valley north of the city of Los Angeles. Also known as the Sylmar Earthquake, it caused 65 deaths, 2500 injuries and an estimated $...

June 20, 2019

Opposites Attract

Engineers and architects often encounter conditions where dissimilar metals are in contact. When these situations arise, it is appropriate to consider the corrosion susceptibility of the materials. Although the term corrosion can be broadly...

June 7, 2019

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

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

A probabilistic methodology to investigate pinching failure of pressurized water reactor (PWR) spent nuclear fuel (SNF) rod cladding is presented. The considered accident scenario is a 9-m SNF transportation cask drop after long-term SNF dry...

June 3, 2019

Common Smoke Control Approaches in High-rise Buildings

Although the rationale for providing redundant automatic systems to manage smoke movement in tall buildings where manual fire suppression activities cannot be easily undertaken is clear, it is less clear why there is so much...

May 28, 2019

Understanding Unitized Facade Systems and Mega Panel Applications

Prefabricated building enclosure systems can help project teams streamline construction schedules, reduce construction costs, and improve assembly quality.
May 20, 2019

Undercut and Grouted Anchors as Post-Installed Shear Reinforcement

By: Anthony Dondrea, Oguzhan Bayrak

Research and experience has shown that given specific loading scenarios and reinforcement configurations, reinforced concrete members may experience nonductile shear failures that can occur in sudden and brittle modes, often leading to structural...

May 10, 2019

Performance and Policy Related to Aluminum Culverts in Wisconsin

Current Wisconsin Department of Transportation policy severely limits the use of aluminum drainage structures (pipe and box culverts) based on the observation of pitting corrosion from deicing salts that led to the failure of an aluminum culvert...

April 10, 2019

Development of a New-Generation High-Strength Post-Tensioned Anchor Bar

By: Jared Brewe, Neal Anderson

The new signature, steel arch bridge for I-74 over the Mississippi River is connected to the abutments by high-strength, post-tensioned anchorage bars. To achieve a design 100-yr service life for the anchorage bars in an exposed condition, a...