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Architectural Engineering

Missouri University of Science and Technology

Series

2003

Articles 1 - 10 of 10

Full-Text Articles in Architecture

Web Crippling And Combined Bending And Web Crippling Of Cold-Formed Steel Beam Headers, Sutton F. Stephens, Roger A. Laboube Dec 2003

Web Crippling And Combined Bending And Web Crippling Of Cold-Formed Steel Beam Headers, Sutton F. Stephens, Roger A. Laboube

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Beam headers are commonly used in walls framed with cold-formed steel studs to span openings in bearing walls. This paper presents the results of an experimental study conducted at the University of Missouri-Rolla to establish the web crippling strength of both box- and I-beam headers for an interior-one-flange (IOF) loading condition. the beam header specimens were tested as a system consisting of two C-sections together with top and bottom track sections. the header configuration used in this study are defined in the Standard for Cold-Formed Steel Framing, Header Design (2000). Tested as a system, it was found that the web …

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Characterizing Debris Clouds Created In Oblique Orbital Debris Particle Impact, D. Depczuk, William P. Schonberg Oct 2003

Characterizing Debris Clouds Created In Oblique Orbital Debris Particle Impact, D. Depczuk, William P. Schonberg

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The problem of pollution within Earth's orbital environment has gained considerable recognition over the past decades. Determining adequate passive protection schemes is an unending process that attempts to meet different objectives for widely varying types of missions. Significant amounts of resources have been expended toward development of numerical and analytical models that model the response of a variety of target systems under high-speed orbital debris impacts. the objective of the study whose results are presented herein was to improve upon an existing oblique hypervelocity impact model that characterizes the various secondary debris clouds created in such an impact. This was …

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Modeling And Control Of Vinyl Chloride In Drinking Water Distribution Systems, Michael Beardsley, Craig D. Adams Sep 2003

Modeling And Control Of Vinyl Chloride In Drinking Water Distribution Systems, Michael Beardsley, Craig D. Adams

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In water distribution systems containing PVC pipe manufactured in the "early era" (prior to 1977), vinyl chloride can leach into drinking water resulting in vinyl chloride concentrations exceeding the 2 μg·L-1 maximum contaminant level. Field testing of dead-end segments of water distribution systems consisting of early-era PVC pipe was conducted to examine their initial intrapipe vinyl chloride monomer (VCM) concentrations based on a Fickian-diffusion-Based leaching model. the experiments showed a wide range of VCM concentrations within early-era PVC pipe ranging from less than 50 to more than 600 mg·kg-1. based on the diffusion modeling approach, a protocol was designed that …

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North American Design Guidelines For Concrete Reinforcement And Strengthening Using Frp: Principles, Applications And Unresolved Issues, Antonio Nanni Sep 2003

North American Design Guidelines For Concrete Reinforcement And Strengthening Using Frp: Principles, Applications And Unresolved Issues, Antonio Nanni

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

This paper reports on the North American state-of-the-art in the use of FRP composites in concrete structures. for new construction, FRP bars have been used as the internal reinforcement in concrete members to replace conventional steel rebars for a host of reasons. the principles for design and construction have been established and proposed to industry by the American Concrete Institute (ACI). for repair and upgrade, strengthening of concrete members with externally bonded FRP laminates or near surface mounted (NSM) bars has received remarkable attention. the design and construction principles for use in practice are being finalized by ACI. on the …

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Field Assessment Of Unreinforced Masonry Walls Strengthened With Fiber Reinforced Polymer Laminates, J. Gustavo Tumialan, Nestore Galati, Antonio Nanni Aug 2003

Field Assessment Of Unreinforced Masonry Walls Strengthened With Fiber Reinforced Polymer Laminates, J. Gustavo Tumialan, Nestore Galati, Antonio Nanni

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Unreinforced masonry (URM) walls strengthened with composites were tested to failure at a decommissioned building in St. Louis, Missouri. the walls were subjected to out-of-plane loading. Previous work on URM as well as reinforced masonry walls strengthened with fiber reinforced polymer (FRP) laminates has shown remarkable increases in capacity and ductility. However, most of this research work has been conducted in the laboratory, where it is difficult to reproduce real field conditions. in this context, this experimental program offered a unique opportunity for performing field experimentation on URM walls strengthened FRP laminates showing that shear compression led to controlling the …

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Tensile Characterization Of Frp Rods For Reinforced Concrete Structures, F. Micelli, Antonio Nanni Jul 2003

Tensile Characterization Of Frp Rods For Reinforced Concrete Structures, F. Micelli, Antonio Nanni

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The application of FRP rods as an internal or external reinforcement in new or damaged concrete structures is based on the development of design equations that take into account the mechanical properties of FRP material systems. the measurement of mechanical characteristics of FRP requires a special anchoring and protocol, since it is well known that these characteristics depend on the direction and content of fibers. in this study, an effective tensile test method is described for the mechanical characterization of FRP rods. Twelve types of glass and carbon FRP specimens with different sizes and surface characteristics were tested to validate …

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Mass Transfer And Benzene Removal From Air Using Latex Rubber Tubing And A Hollow-Fiber Membrane Module, Mark W. Fitch, Jeffrey Neeman, Ellen England Mar 2003

Mass Transfer And Benzene Removal From Air Using Latex Rubber Tubing And A Hollow-Fiber Membrane Module, Mark W. Fitch, Jeffrey Neeman, Ellen England

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

A Dense-Phase Latex Rubber Tube and a Polyporous Propylene Hollow-Fiber Membrane Module (HFMM) Were Investigated for Control of Benzene-Contaminated Gas Streams. the Abiotic Mass Flux Observed through the Latex Tube Was 3.9-13 Mg/(Min·m2) for 150 Ppm of Benzene at Various Gas and Liquid Flow Rates, While a 100-Fold Lower Mass Flux Was Observed in the HFMM. after Seeding with an Aromatic-Degrading Culture Enriched from Activated Sludge, the Observed Removal Was 80% of 150 Ppm, Corresponding to a Mass Flux of 45 Mg/(Min·m2). the Observed Mass Flux through the HFMM during Biofiltration Also Rose, to 0.4 Mg/(Min·m2). Because the HFMM Had …

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Web Crippling Of Cold-Formed Steel Beams At End Supports, M. W. Holesapple, Roger A. Laboube Jan 2003

Web Crippling Of Cold-Formed Steel Beams At End Supports, M. W. Holesapple, Roger A. Laboube

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

This investigation focused on the effects of overhang length on the web crippling capacity of cold-formed steel members. the current design recommendations in North America do not provide for an increase in web crippling capacity for end-one-flange loading when an overhang is present beyond the end support. the test specimens used for the investigation were single web C-sections and Z-sections. the current design requirements for end-one-flange web crippling capacity were found to be conservative for overhang lengths ranging from 0.5 h to 1.5 h , where h is the web depth. However, the design practice that permits the application of …

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Remediation Of A Sinkhole Induced By Quarrying, Thomas J. Abkemeier, Richard Wesley Stephenson Jan 2003

Remediation Of A Sinkhole Induced By Quarrying, Thomas J. Abkemeier, Richard Wesley Stephenson

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

On the Morning of April 28, 1997, a Sinkhole Developed Beneath a Burlington Northern Santa Fe Railway Track. the Sinkhole Caused the Derailment of 22 Railroad Cars, Spilling Diesel Fuel from the Engines that Ignited, Resulting in a Fire and Injuries to Railroad Personnel. Railroad Personnel Filled the Sinkhole with About 500 Cubic Yards of Rock Fill, and Traffic Resumed While a Subsurface Study Was Carried Out. the Study Resulted in a Grouting Program Where 40 to 50 Cubic Yards of Grout Were Injected into the Subsurface. in August of 1999, the Track Subsided Again. a Second Investigation Conducted in …

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A Simplified Two Dimensional Soil Model For The New Madrid Seismic Zone, Wei Zheng, Ronaldo Luna Jan 2003

A Simplified Two Dimensional Soil Model For The New Madrid Seismic Zone, Wei Zheng, Ronaldo Luna

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The New Madrid Seismic Zone (NMSZ) is one of the most seismically susceptible areas in United States. Deep alluvial soil deposit of the Mississippi Embayment overlies the NMSZ, which remains a major uncertainty for site response analysis. based on the experiment data, a simple constitutive soil model is developed to take into account the influence of the effective confining pressure on the shear modulus degradation and the viscous damping development in soil, and also the shear strain and the plasticity index. This model is implemented into a two-dimensional finite element code in the time domain. the Rayleigh viscous damping scheme …

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