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Articles 3871 - 3900 of 7866

Full-Text Articles in Civil and Environmental Engineering

Vertical Shear Wave Velocity Profiles Generated From Spectral Analysis Of Surface Waves: Field Examples, Neil Lennart Anderson, Genda Chen, Siasi Kociu, Ronaldo Luna, Thanop Thitimakorn, Alexi A. Malovichko, D. Malovichko, D. Shylakov Apr 2003

Vertical Shear Wave Velocity Profiles Generated From Spectral Analysis Of Surface Waves: Field Examples, Neil Lennart Anderson, Genda Chen, Siasi Kociu, Ronaldo Luna, Thanop Thitimakorn, Alexi A. Malovichko, D. Malovichko, D. Shylakov

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Surface wave (Rayleigh wave) seismic data were acquired at six separate bridge sites in southeast Missouri. Each acquired surface wave data set was processed (spectral analysis of surface waves; SASW) and transformed into a site-specific vertical shear-wave velocity profile (SASW shear-wave velocity profile). The SASW shear-wave velocity profiles generated for each bridge site were compared to other geotechnical data including seismic cone penetrometer shear-wave velocity profiles, cross-borehole shear-wave velocity profiles, and borehole lithology logs. The geotechnical data presented herein indicate the SASW shear-wave velocity profiles correlate well with subsurface lithology logs and available cross-borehole shear-wave velocity control. More specifically, clays, …

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Utilisation Of Bagasse Fly Ash And Carbon Waste From Fertiliser Plant For Treatment Of Pyridine And 3-Picoline Bearing Wastewater, Indra Deo Mall, Sanjay Tewari, Nripendra Singh, Indra Mani Mishra Mar 2003

Utilisation Of Bagasse Fly Ash And Carbon Waste From Fertiliser Plant For Treatment Of Pyridine And 3-Picoline Bearing Wastewater, Indra Deo Mall, Sanjay Tewari, Nripendra Singh, Indra Mani Mishra

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The present work explores the possibility of utilizing sugarcane bagasse fly ash and carbon waste obtained from sugar mills and nitrogenous fertilizer plants, respectively for the removal of pyridine and 3-picoline from waste water. The adsorbing capacity of both adsorbents has been compared with that of activated carbon. Batch studies were conducted to see the effect of contact time, adsorbent dose, initial concentration and pH on the removal of pyridine and 3-picoline. Equilibrium data were fitted with Langmuir and Freundlich isotherms. Adsorptive capacities were found to be in the order: activated carbon > carbon waste > bagasse fly ash. Adsorption was found …

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Studies On The Use Of Carbon Waste Generated From Fertiliser Plant In Waste Water Treatment, Indra Deo Mall, Sanjay Tewari, Nripendra Singh Mar 2003

Studies On The Use Of Carbon Waste Generated From Fertiliser Plant In Waste Water Treatment, Indra Deo Mall, Sanjay Tewari, Nripendra Singh

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Carbon waste generated from fertiliser plant has been used for adsorption studies for the removal of chromium, zinc and nickel and COD from industrial effluent from phenol formaldehyde plant, polyester plant, sugar plant. Removal to the extent of 91.40, 86.8, 93.8 percent was achieved at the initial concentration of 10 mg/1 for Cr(VI), Ni(TI) and Zn(II) respectively using carbon waste as adsorbent Removal of these metals were found to be in order of Zn(II) > Cr(VI) > Ni(II). In a multi cationic solution containing these three metals, Cr(VI) adsorbed preferentially over Ni(II) and Zn(II). COD removal of 67.51%, and 86.4 % was …

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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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Cold-Formed Steel Top Load Bearing Tracks, Nahb Research Center, Inc. Mar 2003

Cold-Formed Steel Top Load Bearing Tracks, Nahb Research Center, Inc.

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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Ccfss Technical Bulletin February 2003, Wei-Wen Yu Center For Cold-Formed Steel Structures Feb 2003

Ccfss Technical Bulletin February 2003, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Technical Bulletins (1993 - 2020)

No abstract provided.

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Ccfss News February 2003, Wei-Wen Yu Center For Cold-Formed Steel Structures Feb 2003

Ccfss News February 2003, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Newsletters (1999 - 2008)

No abstract provided.

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Hybrid Wood And Steel Sole Plate Connection Walls To Floors Testing Report, Nahb Research Center, Inc. Feb 2003

Hybrid Wood And Steel Sole Plate Connection Walls To Floors Testing Report, Nahb Research Center, Inc.

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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Testing Of Steel Single L-Headers, Nahb Research Center, Inc. Feb 2003

Testing Of Steel Single L-Headers, Nahb Research Center, Inc.

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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Testing Of Steel Single L-Headers, Nahb Research Center Feb 2003

Testing Of Steel Single L-Headers, Nahb Research Center

CCFSS Library (1939 - present)

The purpose of this test report is to substantiate a more cost-competitive alternative to “box beam” and “back-to-back” headers by expanding upon the Lheader testing program that was previously conducted at the NAHB Research Center, Inc. Previous testing of double L-shaped headers indicated that these headers could be a viable alternative to the existing box-beam or back-to-back headers in lightly loaded applications. The higher capacity of the previously tested L-headers was mainly due to the fact that there is an added benefit from the top track that may be neglected in the design process. However, the application of these previous …

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Statistical Analysis Of Structural Plate Mechanical Properties, Somchat Suwan, Lance Manuel, Karl H. Frank Jan 2003

Statistical Analysis Of Structural Plate Mechanical Properties, Somchat Suwan, Lance Manuel, Karl H. Frank

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

The purpose of this research is to survey the mechanical properties of A572 and A588 plates produced in North America. The study focuses on three aspects: chemical properties, tensile properties, and toughness properties. Results from this study can be of benefit to specification-writing bodies and other users interested in the variability of mechanical properties of A572 and A588 plates. The results can also help update present databases on plate properties that do not include modern production techniques and new mills and producers.--Introduction.

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Estimating The Response Of Cold-Formed Steel Frame Shear Walls, American Iron And Steel Institute Jan 2003

Estimating The Response Of Cold-Formed Steel Frame Shear Walls, American Iron And Steel Institute

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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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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The Strength Of Stiffened Cfs Floor Joist Assemblies With Offset Loading, S. R. Fox Jan 2003

The Strength Of Stiffened Cfs Floor Joist Assemblies With Offset Loading, S. R. Fox

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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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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How To Establish Successful Cooperative Student Learning Centers For Stem Courses, Ronald James Bieniek, Douglas R. Carroll, Cesar Mendoza, Oran Allan Pringle, Ekkehard Sinn, Kai-Tak Wan, Donald C. Wunsch Jan 2003

How To Establish Successful Cooperative Student Learning Centers For Stem Courses, Ronald James Bieniek, Douglas R. Carroll, Cesar Mendoza, Oran Allan Pringle, Ekkehard Sinn, Kai-Tak Wan, Donald C. Wunsch

Physics Faculty Research & Creative Works

Students learn more if they are actively involved in the learning process, particularly in a cooperative manner. Several UMR faculty have operated course-based learning centers (LCs) as part of the campus-wide Learning Enhancement Across Disciplines (LEAD) Program of student learning assistance and enhancement. LCs are designed to assist large numbers of students in a cost- and time-efficient manner that promotes student engagement without requiring undue amounts of faculty time. Course instructors spend time in the open learning environment of the LC, in lieu of office hours, guiding students to master course material and skills in their evolution from novice to …

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Rapid Measurement Of Indoor Mass-Transfer Coefficients, Glenn Morrison, Zhao Ping, Deborah J. Wiseman, Maneerat Ongwandee, Hong Chang, Julie Portman, Shekhar Regmi Jan 2003

Rapid Measurement Of Indoor Mass-Transfer Coefficients, Glenn Morrison, Zhao Ping, Deborah J. Wiseman, Maneerat Ongwandee, Hong Chang, Julie Portman, Shekhar Regmi

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Indoor air pollutant concentrations can be influenced by how rapidly species are transported to and from surfaces. Consequently, a greater understanding of indoor transport phenomena to surfaces improves estimates of human exposure to indoor air pollutants. Here, we introduce two methods of rapidly and directly measuring species fluxes at indoor surfaces, allowing us to evaluate the transport-limited deposition velocity, vt (a mass-transfer coefficient). The deposition velocity sensor (DeVS) method employs a small microbalance coated with a pure hydrocarbon, preferably octadecane. We quantify flux (or evaporation rate) of the hydrocarbon into a room by observing the rate of mass loss …

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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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Interactive Learning Tools: Animating Statics, Nancy Hubing, David B. Oglesby, Timothy A. Philpot, Vikas Yellamraju, Richard H. Hall, Ralph E. Flori Dec 2002

Interactive Learning Tools: Animating Statics, Nancy Hubing, David B. Oglesby, Timothy A. Philpot, Vikas Yellamraju, Richard H. Hall, Ralph E. Flori

Business and Information Technology Faculty Research & Creative Works

Computer-Based Modules for Engineering Instruction Must Be Concise, Flexible, Educational and Engaging in Order to Effectively Supplement Traditional Classroom Teaching Tools. a Computer Example that Takes More Time Than a Chalkboard Presentation is Not Likely to Be Useful in Today's Engineering Classroom. Flexible Navigation is Necessary So that the Instructor Can Quickly and Easily Respond to Student Questions. Useful Modules Must Also Improve Problem-Solving Skills or Clarify Troublesome Concepts in Order to Be Considered Worthy of Inclusion in the Limited Class Time Available. Finally, and Perhaps Most Importantly, Effective Computer-Based Modules Must Meet the Challenge of Holding the Student's Attention. …

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Strengthening Of Short Shear Span Reinforced Concrete T Joists With Fiber-Reinforced Plasic Composites, Francesco Micelli, Raghu H. Annaiah, Antonio Nanni Nov 2002

Strengthening Of Short Shear Span Reinforced Concrete T Joists With Fiber-Reinforced Plasic Composites, Francesco Micelli, Raghu H. Annaiah, Antonio Nanni

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In this work, the results of an experimental study conducted in a 1964-vintage building are presented. Twelve reinforced concrete (RC) T-joists strengthened with fiber-reinforced plastic (FRP) composites were loaded until failure in a short shear span configuration. Different strengthening schemes, including different FRP materials and a new FRP anchorage system, were adopted in order to compare the performance of the different installations. Carbon FRP and aramid FRP sheets in an epoxy matrix were bonded to the RC joists using the wet layup technique. All of the joists were loaded close to one end support and showed similar cracking patterns at …

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Strengthening And Load Testing Of Three Bridges In Boone County, Missouri, S. Schiebel, R. Parretti, Antonio Nanni, M. Huck Nov 2002

Strengthening And Load Testing Of Three Bridges In Boone County, Missouri, S. Schiebel, R. Parretti, Antonio Nanni, M. Huck

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Three bridges in Boone County, Missouri - Brown School Road, Coats Lane, and Creasy Springs Bridges - were selected for strengthening with carbon-fiber-reinforced polymer laminates in both shear and flexure. The objective of the rehabilitation program was to remove the 15-ton load posting that had been imposed on each of the bridges. To verify the results of the upgrade, load tests were performed before and after strengthening on two of the bridges - Brown School Road and Coats Lane Bridges. This paper presents the procedures followed in the design, installation, and load testing of the bridges. A recommendation regarding the …

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Review Of Stabilization Of Clays And Expansive Soils In Pavements And Lightly Loaded Structures - History, Practice, And Future, Thomas M. Petry, Dallas N. Little Nov 2002

Review Of Stabilization Of Clays And Expansive Soils In Pavements And Lightly Loaded Structures - History, Practice, And Future, Thomas M. Petry, Dallas N. Little

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Expansive clay soils-those that change significantly in volume with changes in water content-are the cause of distortions to structures that cost taxpayers several billion dollars annually in the United States. Much has been learned about their behavior over the past 60 years, and relatively successful methods have been developed to modify and stabilize them. This paper reviews some of the key advances developed over the past 60 years in improving our understanding of the nature and methods of modifying and stabilizing expansive clay soils. The state of the practice in stabilization is presented, and practical and research needs to help …

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Structural Behaviour Of Self-Piercing Riveted Connections In Steel Framed Housing, Stephen Moss, Mahen Mahendran Oct 2002

Structural Behaviour Of Self-Piercing Riveted Connections In Steel Framed Housing, Stephen Moss, Mahen Mahendran

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

Self-piercing riveting involves the joining of two or more plates by using a rivet to pierce and clinch in a single operation. There is a distinct lack of information regarding the use of self-piercing riveted connections in cold-formed steel frames. Experimental research is being undertaken to investigate the structural behaviour of self-piercing riveted connections used in steel framed housing. To date, testing has been carried out on 0.75 mm to 1.15 mm G300 steels to determine the primary failure modes for self-piercing riveted connections and also to assess the applicability of standard single point lap shear tests to actual house …

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Seismic Performance Of Wall-Stud Shear Walls, Ludovic A. Fulop, Dan Dubina Oct 2002

Seismic Performance Of Wall-Stud Shear Walls, Ludovic A. Fulop, Dan Dubina

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

The ever-increasing need for housing generated the search for new and innovative building methods to increase speed, efficiency and enhance quality, one direction being the use of light steel profiles as load bearing elements and different materials for cladding. Wind and seismic behavior of these structures is influenced by the hysteretic characteristics of the shear wall panels. In this paper a review of actual research in the field and results of a full-scale shear test program on wall panels are presented. Based on tests, a numerical equivalent model for hysteretic behavior of wall panels working in shear was built to …

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Stiffened Elements With Multiple Intermediate Stiffeners And Edge Stiffened Elements With Intermediate Stiffeners, Benjamin W. Schafer Oct 2002

Stiffened Elements With Multiple Intermediate Stiffeners And Edge Stiffened Elements With Intermediate Stiffeners, Benjamin W. Schafer

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

Section B5 of the AISI Specification, covering stiffened elements with multiple intermediate stiffeners and edge stiffened elements with intermediate stiffeners, has been entirely replaced in the latest edition of the Cold-Formed Steel Specification (NAS 2001). The new design rules are based primarily on the work of Schafer and Pekoz (1998); however, subsequent to that work and prior to adoption by AISI, additional work was also completed. For elements with multiple intermediate stiffeners consideration of weblflange interaction was added. The resulting expressions are shown to agree well with both experimental and numerical data. New provisions for edge stiffened elements with intermediate …

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Gbt-Based Distortional Buckling Formulae For Thin-Walled Channel Columns And Beams, Nuno Silvestre, Dinar Camotim Oct 2002

Gbt-Based Distortional Buckling Formulae For Thin-Walled Channel Columns And Beams, Nuno Silvestre, Dinar Camotim

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

After a brief outline of the Generalized Beam Theory (GBT) fundamentals and linear stability analysis procedure, the main concepts and steps involved in the derivation of GBT -based fully analytical formulae are described and discussed. Such formulae provide distortional bifurcation stress estimates in cold-formed steel channel columns and beams with arbitrary sloping single-lip edge stiffeners and pinned/free-to-warp or fixed/warping-free end sections. The application of the proposed formulae is illustrated in detail and, in order to assess their accuracy and validity, results concerning several specific channel columns and beams are presented. In particular, the GBT-based analytical estimates are compared with exact …

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Structural Behavior Of Bolted Connections In Cold-Formed Steel Members, Emphasizing The Shear Lag Effect, Carlos Henrique Maiola, Maximiliano Malite, Jorge Munaiar Neto, Roberto Martins Goncalves Oct 2002

Structural Behavior Of Bolted Connections In Cold-Formed Steel Members, Emphasizing The Shear Lag Effect, Carlos Henrique Maiola, Maximiliano Malite, Jorge Munaiar Neto, Roberto Martins Goncalves

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

Light-gage steel structures constituted mainly of cold-formed steel members have been widely employed in a variety metal construction in Brazil and many countries. The reduced thicknesses this elements making connection designing difficult due the occurrence of the local effects that generally govern these designs in thin elements. This paper presents and discusses the results of a experimental investigation of bolted connections in cold-formed angles (either equal or unequal legs) and channel members (1.55 to 3.75mm thickness), and an evaluation of the structural behavior of the connections with identification of the corresponding failure modes, with emphasis on the tensile capacity of …

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Testing Of Bolted Cold-Formed Steel Connections In Bearing (With And Without Washers), J. A. Wallace, R. M. Schuster Oct 2002

Testing Of Bolted Cold-Formed Steel Connections In Bearing (With And Without Washers), J. A. Wallace, R. M. Schuster

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

Presently there are two cold-formed steel structural design documents in North America, i.e., in the USA, the Specification for the Design of Cold-Formed Steel Structural Members, published by the American Iron and Steel Institute (AISI 1996) and in Canada, the Standard for Cold-formed Steel Structural Members, published by the Canadian Standards Association (CSA 1994). The bearing strength of bolted connections is treated differently in these two design documents. The North American Specification for the Design of Cold-formed Steel Structural Members (NAS 2001) contains a new approach for bearing of bolted connections. This approach is similar to the current S136 Standard …

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Ultimate Failure Behaviour Of Second-Generation Sheeting Subjected To Combined Bending Moment And Concentrated Load, M. Kaspers, H. H. Snijder, Monique Bakker, H. Hofmeyer Oct 2002

Ultimate Failure Behaviour Of Second-Generation Sheeting Subjected To Combined Bending Moment And Concentrated Load, M. Kaspers, H. H. Snijder, Monique Bakker, H. Hofmeyer

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

Second-generation sheeting is widely used for cladding and roof construction. At interior supports, it is subjected to combined bending moment and concentrated load. Unfortunately, design rules for this loading are complicated and do not provide insight in the sheeting's failure behaviour. This means there is a need for a new, insight providing design rule. For first-generation sheeting, a similar problem did exist. The Technische Universiteit Eindhoven (TUE) carried out three research projects [Bakk92a,Vaes95a,Hofm00a] that provided insight in the first-generation sheeting behaviour and resulted in a new, insight providing design rule. The TUE now uses the strategy of these three research …

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Behaviour Of Cold-Formed Thin-Walled Steel Short Columns With Service Holes At Elevated Temperatures, M. Feng, Y. C. Wang, J. Michael Davies Oct 2002

Behaviour Of Cold-Formed Thin-Walled Steel Short Columns With Service Holes At Elevated Temperatures, M. Feng, Y. C. Wang, J. Michael Davies

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

This paper presents the results of an experimental and numerical investigation into the axial strength of cold-formed thin-walled lipped channel sections with service holes under ambient and uniform high temperature conditions. Short columns of two different thickness with service holes under different temperatures have been tested, and analysed by using a variety of design methods and a commercial finite element program ABAQUS (1998). Three design methods (the British Standard BS5950 Part 5 (1987), Eurocode 3 Part 1.3 (CEN 1996) and the American Specification AISI (1996)) have been used in this paper. In the finite element analysis, both geometrical and material …

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