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Displaying 1 - 25 of 205

State of the Art and Research Needs in Design for Tornadoes: Structural Engineering Institute Workshop Report

September 30, 2024
Author(s)
Donald Scott, Jennifer Goupil, Shane Crawford, Alex Griffin, Cherylyn Henry, Marc Levitan, Franklin Lombardo, John van de Lindt, Peter Vickery
The Structural Engineering Institute (SEI) has a long history of working with NIST and other federal partners to improve ASCE/SEI 7 Minimum Design Loads and Associated Criterial for Buildings and Other Structures, the national loading standard. Following

Workshop on Decarbonization: A Gap Analysis of LCA Standards for Industry

September 20, 2024
Author(s)
Noah Last, Joshua D. Kneifel, Amy Costello, Catherine Houska, Katherine Morris
ASTM International's committee on sustainability (E60), in collaboration with the National Institute of Standards and Technology (NIST), hosted the virtual "Workshop on Decarbonization: A Gap Analysis of LCA Standards for Industry" on October 10-11, 2023

Construction Quality and Assurance for Functional Recovery Design

September 6, 2024
Author(s)
Jakub Valigura, Dustin Cook, Siamak Sattar
As part of the ACI 374A Subcommittee on Design of Reinforced Concrete Structure for Functional Recovery, the authors held six expert panel discussions with experts in various aspects of building design and construction. The goal of the discussions was to

Database-assisted-design facilitating performance-based tall building design

July 17, 2024
Author(s)
Daniel Rhee, Sophie Sisson, Brian Carman, Mehedy Mashnad, DongHun Yeo
In recent years, wind design, particularly for high-rise buildings, has seen a paradigm shift from a code-based descriptive method to a more specific performance-objective-based design. This new approach, known as the Performance-Based Wind Design (PBWD)

Functional Recovery in Modern Reinforced Concrete Buildings

July 5, 2024
Author(s)
Dustin Cook, ABBIE LIEL, Amir Safiey
In the field of structural engineering, functional recovery is a new, but non-standardized building design objective intended to improve a building's capacity to maintain or rapidly restore basic intended functions after a hazard event, such as an

Building Seismic Stability - Code Provisions vs. Inelastic Behavior

June 30, 2024
Author(s)
Larry Fahnestock, Shitao Shi, Matthew Speicher
In a building, seismic stability is provided when the internal restoring forces resist the effective earthquake forces plus the destabilizing effects of gravity that arise when the building displaces laterally. Although this concept can be succinctly

Lessons from the 2023 Southeast Turkiye Earthquakes: A Study on Damaged RC Buildings Considering the Hassan Index

June 30, 2024
Author(s)
Cemalettin Donmez, Jeff Dowgala, Meltem Eryilmaz-Yildirim, Muhammet Fethi Gullu, Lissette Iturburu, Fahri Baran Koroglu, Remy Lesquesne, Baki Ozturk, Santiago Pujol, Julian Rincon, Chungwook Sim, Matthew Speicher
A survey was conducted across 10 cities in Southeast Türkiye to classify damage in 242 reinforced concrete (RC) buildings constructed in the last 15 years, ranging from 2 to 16 stories. The 'robustness' of these buildings was quantified using ratios of

Tornado Wind Speed Maps for Building Design: Research and Development of Tornado Risk Assessment Methodology

October 2, 2023
Author(s)
Lawrence A. Twisdale, Sudhan S. Banik, Lauren A. Mudd, Marshall Hardy, Shahriar Quayyum, Fangqian Liu, Melissa K. Faletra, Peter J. Vickery, Marc Levitan, Long Phan
The first-ever engineering-derived tornado wind speed maps have been produced for the contiguous United States. Using multi-variate statistical analysis of 11 tornado and physiographic variables, we developed 9 broad tornado climatology regions. We

A DNS study of the impact of gravity on spherically expanding laminar premixed flames

September 25, 2023
Author(s)
Lukas Berger, Raik Hesse, Michael Hegetschweiler, Antonio Attili, Konstantin Kleinheinz, Joachim Beeckmann, Gregory T. Linteris, Heinz Pitsch
Determining laminar flame speeds from spherical flame experiments is dicult for low flame speeds, when the flame shapes quickly become non-spherical due to the influence of gravity. Direct Numerical Simulations (DNS) of spherically expanding laminar

A Microgravity Flame Speed Study on Refrigerant Mixtures of 2,3,3,3-Tetrafluoropropene (R1234yf) and Difluoromethane (R32)

September 25, 2023
Author(s)
Raik Hesse, Roman Glaznev, Christian Schwenzer, Valeri I. Babushok, Gregory T. Linteris, Heinz Pitsch, Joachim Beeckmann
Today's hydrofluorocarbon (HFC) refrigerants are designed to have a low global warming potential (GWP), resulting in fast atmospheric decomposition and increased reactivity. This causes them to be mildly flammable. The laminar flame speed SL,u ranks

Data Reduction Considerations for Spherical Constant Volume Flames of R32(CH2F2) with Air

September 25, 2023
Author(s)
Michael Hegetschweiler, Lukas Berger, Raik Hesse, Joachim Beeckmann, Chaimae Bariki, Heinz Pitsch, Gregory T. Linteris
The present work explores data reduction techniques for the measurement of the laminar burning velocities of R32(CH2F2)-air using a constant volume combustion device in which the pressure-time history is the only measured parameter. To allow clear

Elucidating the challenges in extracting ultra-slow flame speeds in a closed vessel - A CH2F2 microgravity case study using optical and pressure-rise data

September 25, 2023
Author(s)
Raik Hesse, Chaimae Bariki, Michael Hegetschweiler, Gregory T. Linteris, Heinz Pitsch, Joachim Beeckmann
Refrigerants with a low global warming potential (GWP) possess mild flammability. Hence, a fundamental understanding of their combustion characteristics is required to assess their fire-hazardous potential. The laminar burning velocity is one fundamental

Simultaneous Particle Image Velocimetry and Schlieren Measurements of Slow-burning Flames

September 25, 2023
Author(s)
Christian Schwenzer, Raik Hesse, Roman Glaznev, Valeri I. Babushok, Gregory T. Linteris, Heinz Pitsch, Joachim Beeckmann
The measurement of laminar flame speed is an essential factor in determining the reactivity, exothermicity, and diffusivity of a combustible mixture. In this study, the Schlieren method and Particle Image Velocimetry (PIV) were utilized simultaneously to
Displaying 1 - 25 of 205