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Displaying 76 - 100 of 205

Activities and Lessons Learned from ACI Committee 133 - Disaster Reconnaissance

September 13, 2020
Author(s)
Lucas A. Laughery, Aishwarya Y. Puranam, Christopher Segura, Anahid A. Behrouzi
ACI Committee 133 Disaster Reconnaissance was established with the mission of reporting on the effects of major disasters on reinforced concrete (RC) structures. ACI 133 members monitor natural and manmade disasters worldwide to identify events that affect

Loading Protocols and Backbone Curves: U.S. and Japan Perspectives

September 13, 2020
Author(s)
Bruce F. Maison, Kazuhiko Kasai, Matthew Speicher
With the gaining popularity of performance-based engineering, it is essential to have reliable estimates of component (e.g., steel beam or column) performance under actual earthquake loading demands. In the United States, a component backbone curve

Seismic Stability Assessment of Steel Moment Frames and Implications for Design

September 13, 2020
Author(s)
Larry Fahnestock, Shitao Shi, Matthew Speicher
Although it is clear that a building must be capable of carrying gravity loads while developing large inelastic deformations and associated lateral displacements during a large earthquake, achieving this performance objective in day-to-day practice still

Low global-warming-potential refrigerant CH2F2 (R-32): Integration of a radiation heat loss correction method to accurately determine experimental flame speed metrics

August 22, 2020
Author(s)
Gregory T. Linteris, Raik Hesse, Lukas Berger, Michael Hegetschweiler, Heinz Pitsch, Joachim Beeckmann
Due to their high global warming potential (GWP), hydrofluorocarbon refrigerants (HFCs) are systematically being phased out. Replacements with low GWP exist, but give rise to safety hazards as they are found to be mildly flammable. The assessment of the

Measurements and Modeling of Spherical CH2F2-Air Flames

July 27, 2020
Author(s)
Michael J. Hegetschweiler, John L. Pagliaro, Lukas Berger, Raik Hesse, Joachim Beeckmann, Heinz Pitsch, Gregory T. Linteris
The burning velocity of mixtures of the refrigerant R-32 (CH2F2) with air over a range of equivalence ratios are studied via spherically expanding flames SEFs in a large, optically accessible spherical chamber at constant pressure. Shadowgraph images from

Flammable Refrigerant Safety

April 22, 2020
Author(s)
Gregory T. Linteris, Peter Sunderland
Most refrigerants currently in use have relatively high Global Warming Potential (GWP). For example, the GWPs of R-134a and R-410a are 1300 and 2088. Leaks to the atmosphere are common – typically about 10% of the total charge annually. This has motivated

Effects of Stretch and Radiation on the Laminar Burning Velocity of R-32-Air Flames

March 4, 2020
Author(s)
Michael Hegetschweiler, John Pagliaro, Lukas Berger, Raik Hesse, Joachim Beeckmann, Heinz Pitsch, Gregory T. Linteris
Experiments are performed for outwardly propagating spherical flames of R-32/air mixtures at constant pressure. A high-speed video camera captures shadowgraph images from which the flame radius as a function of time is extracted. Direct numerical

Historical Review of the Metered Section Area for Guarded Hot Plates

December 31, 2019
Author(s)
Robert R. Zarr, Stacy M. Bruss, David McElroy
Results of an extensive literature review and investigation of the metered section area for the guarded-hot-plate method, standardized as ASTM C177, Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means

Social and Economic Components of Resilient Multi-Hazard Building Design

October 3, 2019
Author(s)
Katherine Johnson, Juan Fung, Siamak Sattar, Christopher Segura, Therese P. McAllister, Steven McCabe
In 2017, U.S. damages from natural hazard events exceeded $300B, suggesting that current targets for building performance do not sufficiently mitigate loss. The significant costs borne by individuals, insurers, and government do not include impacts from