The Experts below are selected from a list of 9432 Experts worldwide ranked by ideXlab platform
Paul Nicholso - One of the best experts on this subject based on the ideXlab platform.
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mathematical analysis and flux based radius of influence for radon voc vapor intrusion mitigation systems
Science of The Total Environment, 2020Co-Authors: Todd Mcalary, William Wertz, Darius Mali, Paul NicholsoAbstract:Abstract Volatile organic compounds (VOCs) and radon progeny pose potential health risks to occupants of certain buildings via subsurface vapor intrusion (VI) to indoor air. VI mitigation is usually performed using systems that extract gas from below the building, and the system performance is typically evaluated by measuring the distribution of applied vacuum below the Floor. This article provides a new approach to assessing the radius of influence (ROI) for subSlab venting systems based on mass flux instead of static vacuum distribution and includes an analyses of 121 pneumatic tests performed at 65 different suction points in 16 different buildings. The mathematical model represents a two-layer system with horizontal radial flow through transmissive material below the Floor Slab and vertical flow through discontinuities in the Floor Slab (which is simplified to approximate an equivalent porous medium). The analysis includes comparisons of the flux-based ROI to values calculated using the two-layer model for 1) vacuum, 2) velocity, and 3) travel time, which may be useful as alternative performance metrics for mitigation systems.
Todd Mcalary - One of the best experts on this subject based on the ideXlab platform.
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mathematical analysis and flux based radius of influence for radon voc vapor intrusion mitigation systems
Science of The Total Environment, 2020Co-Authors: Todd Mcalary, William Wertz, Darius Mali, Paul NicholsoAbstract:Abstract Volatile organic compounds (VOCs) and radon progeny pose potential health risks to occupants of certain buildings via subsurface vapor intrusion (VI) to indoor air. VI mitigation is usually performed using systems that extract gas from below the building, and the system performance is typically evaluated by measuring the distribution of applied vacuum below the Floor. This article provides a new approach to assessing the radius of influence (ROI) for subSlab venting systems based on mass flux instead of static vacuum distribution and includes an analyses of 121 pneumatic tests performed at 65 different suction points in 16 different buildings. The mathematical model represents a two-layer system with horizontal radial flow through transmissive material below the Floor Slab and vertical flow through discontinuities in the Floor Slab (which is simplified to approximate an equivalent porous medium). The analysis includes comparisons of the flux-based ROI to values calculated using the two-layer model for 1) vacuum, 2) velocity, and 3) travel time, which may be useful as alternative performance metrics for mitigation systems.
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Mathematical analysis and flux-based radius of influence for radon/VOC vapor intrusion mitigation systems.
Science of The Total Environment, 2020Co-Authors: Todd Mcalary, William Wertz, Darius Mali, Paul NicholsonAbstract:Abstract Volatile organic compounds (VOCs) and radon progeny pose potential health risks to occupants of certain buildings via subsurface vapor intrusion (VI) to indoor air. VI mitigation is usually performed using systems that extract gas from below the building, and the system performance is typically evaluated by measuring the distribution of applied vacuum below the Floor. This article provides a new approach to assessing the radius of influence (ROI) for subSlab venting systems based on mass flux instead of static vacuum distribution and includes an analyses of 121 pneumatic tests performed at 65 different suction points in 16 different buildings. The mathematical model represents a two-layer system with horizontal radial flow through transmissive material below the Floor Slab and vertical flow through discontinuities in the Floor Slab (which is simplified to approximate an equivalent porous medium). The analysis includes comparisons of the flux-based ROI to values calculated using the two-layer model for 1) vacuum, 2) velocity, and 3) travel time, which may be useful as alternative performance metrics for mitigation systems.
William Wertz - One of the best experts on this subject based on the ideXlab platform.
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mathematical analysis and flux based radius of influence for radon voc vapor intrusion mitigation systems
Science of The Total Environment, 2020Co-Authors: Todd Mcalary, William Wertz, Darius Mali, Paul NicholsoAbstract:Abstract Volatile organic compounds (VOCs) and radon progeny pose potential health risks to occupants of certain buildings via subsurface vapor intrusion (VI) to indoor air. VI mitigation is usually performed using systems that extract gas from below the building, and the system performance is typically evaluated by measuring the distribution of applied vacuum below the Floor. This article provides a new approach to assessing the radius of influence (ROI) for subSlab venting systems based on mass flux instead of static vacuum distribution and includes an analyses of 121 pneumatic tests performed at 65 different suction points in 16 different buildings. The mathematical model represents a two-layer system with horizontal radial flow through transmissive material below the Floor Slab and vertical flow through discontinuities in the Floor Slab (which is simplified to approximate an equivalent porous medium). The analysis includes comparisons of the flux-based ROI to values calculated using the two-layer model for 1) vacuum, 2) velocity, and 3) travel time, which may be useful as alternative performance metrics for mitigation systems.
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Mathematical analysis and flux-based radius of influence for radon/VOC vapor intrusion mitigation systems.
Science of The Total Environment, 2020Co-Authors: Todd Mcalary, William Wertz, Darius Mali, Paul NicholsonAbstract:Abstract Volatile organic compounds (VOCs) and radon progeny pose potential health risks to occupants of certain buildings via subsurface vapor intrusion (VI) to indoor air. VI mitigation is usually performed using systems that extract gas from below the building, and the system performance is typically evaluated by measuring the distribution of applied vacuum below the Floor. This article provides a new approach to assessing the radius of influence (ROI) for subSlab venting systems based on mass flux instead of static vacuum distribution and includes an analyses of 121 pneumatic tests performed at 65 different suction points in 16 different buildings. The mathematical model represents a two-layer system with horizontal radial flow through transmissive material below the Floor Slab and vertical flow through discontinuities in the Floor Slab (which is simplified to approximate an equivalent porous medium). The analysis includes comparisons of the flux-based ROI to values calculated using the two-layer model for 1) vacuum, 2) velocity, and 3) travel time, which may be useful as alternative performance metrics for mitigation systems.
Darius Mali - One of the best experts on this subject based on the ideXlab platform.
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mathematical analysis and flux based radius of influence for radon voc vapor intrusion mitigation systems
Science of The Total Environment, 2020Co-Authors: Todd Mcalary, William Wertz, Darius Mali, Paul NicholsoAbstract:Abstract Volatile organic compounds (VOCs) and radon progeny pose potential health risks to occupants of certain buildings via subsurface vapor intrusion (VI) to indoor air. VI mitigation is usually performed using systems that extract gas from below the building, and the system performance is typically evaluated by measuring the distribution of applied vacuum below the Floor. This article provides a new approach to assessing the radius of influence (ROI) for subSlab venting systems based on mass flux instead of static vacuum distribution and includes an analyses of 121 pneumatic tests performed at 65 different suction points in 16 different buildings. The mathematical model represents a two-layer system with horizontal radial flow through transmissive material below the Floor Slab and vertical flow through discontinuities in the Floor Slab (which is simplified to approximate an equivalent porous medium). The analysis includes comparisons of the flux-based ROI to values calculated using the two-layer model for 1) vacuum, 2) velocity, and 3) travel time, which may be useful as alternative performance metrics for mitigation systems.
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Mathematical analysis and flux-based radius of influence for radon/VOC vapor intrusion mitigation systems.
Science of The Total Environment, 2020Co-Authors: Todd Mcalary, William Wertz, Darius Mali, Paul NicholsonAbstract:Abstract Volatile organic compounds (VOCs) and radon progeny pose potential health risks to occupants of certain buildings via subsurface vapor intrusion (VI) to indoor air. VI mitigation is usually performed using systems that extract gas from below the building, and the system performance is typically evaluated by measuring the distribution of applied vacuum below the Floor. This article provides a new approach to assessing the radius of influence (ROI) for subSlab venting systems based on mass flux instead of static vacuum distribution and includes an analyses of 121 pneumatic tests performed at 65 different suction points in 16 different buildings. The mathematical model represents a two-layer system with horizontal radial flow through transmissive material below the Floor Slab and vertical flow through discontinuities in the Floor Slab (which is simplified to approximate an equivalent porous medium). The analysis includes comparisons of the flux-based ROI to values calculated using the two-layer model for 1) vacuum, 2) velocity, and 3) travel time, which may be useful as alternative performance metrics for mitigation systems.
Andrei M. Reinhorn - One of the best experts on this subject based on the ideXlab platform.
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seismic response of rc buildings with inelastic Floor diaphragms
Journal of Structural Engineering-asce, 1991Co-Authors: Sashi K. Kunnath, Nader Panahshahi, Andrei M. ReinhornAbstract:The in-plane flexibility of Floor-Slab systems has been observed to influence the seismic response of many types of reinforced concrete buildings. The assumption of rigid Floor diaphragms is often used to simplify engineering analyses without significant loss in the accuracy of seismic response prediction for most buildings. However, for certain classes of structures, such as long and narrow buildings (especially with dual-braced lateral load-resisting systems), and buildings with horizontal (T- or L-shaped) or vertical (setbacks or cross-walls) offsets, the effect of diaphragm flexibility cannot be disregarded. Moreover, if the Floor Slab panels experience cracking or yielding due to pronounced in-plane distortions, the seismic response of the entire building system may be significantly altered. This paper presents a simplified macromodeling scheme to incorporate the effect of inelastic Floor flexibility in the seismic response analysis of RC buildings. The Slab model includes effects of both in-plane flexure and shear. The inelastic behavior of diaphragms is emphasized through a study of narrow rectangular buildings with end walls. The study shows that the in-plane deflections of Floor Slabs impose a larger demand on strength and ductility of flexible frames than predicted values using the assumption of rigid or elastic Slabs. These demands may in turn lead to a failure of the gravity-load supporting system. A quantitative estimate of this effect is presented in terms of the Floor aspect ratios.