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3,114 full-text articles. Page 6 of 88.

Sensor-Enhanced Analysis And Behavior Of Steel Beams In Fire, Genda Chen 2018 Missouri University of Science and Technology

Sensor-Enhanced Analysis And Behavior Of Steel Beams In Fire, Genda Chen

Genda Chen

Traditionally, strain data are difficult, if not impossible, to obtain from steel structures in fire due to their harsh environment and temperature measurements are limited to the locations of thermocouples. This paper presents high-temperature measurements using a Brillouin scattering based (distributed) fiber optic sensor and the application of the measured temperatures and material parameters recommended in building codes into the enhanced thermo-mechanical analysis of simply-supported steel beams subjected to combined thermal and loading effects. The distributed temperature sensor captures detailed, non-uniform temperature distributions that are compared locally with thermocouple measurements by less than 5% at a 95% confidence level. The ...


Quantification Of Uncertainties In Inline Inspection Data For Metal-Loss Corrosion On Energy Pipelines And Implications For Reliability Analysis, Tammeen Siraj 2018 The University of Western Ontario

Quantification Of Uncertainties In Inline Inspection Data For Metal-Loss Corrosion On Energy Pipelines And Implications For Reliability Analysis, Tammeen Siraj

Electronic Thesis and Dissertation Repository

One of the major threats to the oil and gas transmission pipeline integrity is metal-loss corrosion. Pipeline operators periodically inspect the size of the metal loss corrosion in a pipeline using in-line inspection (ILI) tools to avoid pipe failure which may lead to severe consequences. To predict pipe failure efficiently, reliability-based corrosion management program is gaining popularity as it effectively incorporates all the uncertainties involved in the pipe failure prediction. The focus of the research reported in this thesis is to investigate the unaddressed issues in the reliability-based corrosion assessment to assist in better predicting pipe failure.

First, a methodology ...


Investigation Of A Tractor-Tank Trailer Roadside Containment Barrier, Dean L. Whitfield 2018 University of Nebraska-Lincoln

Investigation Of A Tractor-Tank Trailer Roadside Containment Barrier, Dean L. Whitfield

Civil Engineering Theses, Dissertations, and Student Research

The objective of this research project was to develop a new, cost-effective, Manual for Assessing Safety Hardware (MASH) Test Level 6 (TL-6) barrier. A literature review on prior Test Level 5 and Test Level 6 barriers was conducted, and the cost of current TL-5 and TL-6 barriers was established. Existing and modified design procedures for roadside barrier were reviewed as well as current TL-6 design forces. A preliminary TL-6 truck model was developed in LS-DYNA. The minimum barrier height to contain a tractor-tank vehicle was determined to be 62 in. for a rigid, vertical-faced barrier through LS-DYNA computer simulation. New ...


Cementitious Sensors Exhibiting Stopbands In Acoustic Transmission Spectra, Shreya Vemuganti 2018 University of New Mexico, Albuquerque

Cementitious Sensors Exhibiting Stopbands In Acoustic Transmission Spectra, Shreya Vemuganti

Shared Knowledge Conference

Ultrasonic monitoring in cementitious materials is challenging due to the high degree of attenuation. In wellbore environments, monitoring becomes more challenging due to inaccessibility. Meta materials, also known as acoustic bandgap materials, exhibit an interesting feature of forbidding the propagation of elastic/sound waves and isolate vibration in a certain frequency band. Traditionally, acoustic bandgap materials are developed with inclusions such as tin, aluminum, gold, steel in a polymer matrix. In this study, we present the development of three-dimensional cementitious sensors capable of exhibiting stopbands in the acoustic transmission spectra using carbon nanotubes. Relatively wide stopbands were engineered using Floquet-Bloch ...


Sidelap And Structural Fastener Tests For Steel Deck Diaphragms, Y. Shi, S. Torabian, Benjamin W. Schafer, W. S. Easterling, M. R. Eatherton 2018 Missouri University of Science and Technology

Sidelap And Structural Fastener Tests For Steel Deck Diaphragms, Y. Shi, S. Torabian, Benjamin W. Schafer, W. S. Easterling, M. R. Eatherton

International Specialty Conference on Cold-Formed Steel Structures

Steel deck diaphragm systems, which are commonly used for roof construction in steel-framed buildings, consist of many parts such as corrugated steel deck sheets, sidelap fasteners between adjacent sheets, structural fasteners from the sheets to the supporting beams or joists, chord elements, and collectors. Load-deformation behavior of a steel deck diaphragm system is typically dominated by sidelap and structural fastener limit states. To understand and accurately model the behavior of steel deck diaphragm systems, it is therefore necessary to characterize the behavior of the individual fasteners. The effect of local geometry and detailing at these fasteners such as how the ...


Tensile Strength And Serviceability Of Cold-Formed Steel Clip Angles, Wenying Zhang, Zhishan Yan, Mahsa Mahdavian, Mohamad Yousof, Cheng Yu 2018 Missouri University of Science and Technology

Tensile Strength And Serviceability Of Cold-Formed Steel Clip Angles, Wenying Zhang, Zhishan Yan, Mahsa Mahdavian, Mohamad Yousof, Cheng Yu

International Specialty Conference on Cold-Formed Steel Structures

This paper reports the recent research findings of cold-formed steel clip angles in tension. The relevant experimental program and the proposed design methods are presented. The test program involved two phases of testing: Phase I of program focused on the pull-over strength of screw connections on the anchored leg of the clip angles, and Phase II of program concentrated on the tensile strength of the anchored leg of the clip angles within the service deflection limit. Design methods for predicting the pull-over strength as well as tensile strength within the serviceability deformation limit are proposed based on the test results ...


Strength Of Cold-Formed Steel Clip Angle In Combined Bending And Shear Loading, Cheng Yu, Zhishan Yan, Wenying Zhang 2018 Missouri University of Science and Technology

Strength Of Cold-Formed Steel Clip Angle In Combined Bending And Shear Loading, Cheng Yu, Zhishan Yan, Wenying Zhang

International Specialty Conference on Cold-Formed Steel Structures

Thin-walled cold-formed steel (CFS) clip angles have been commonly used for connecting CFS framing members or attaching CFS members to the major building structure. The implementation of clip angles involves consideration of ultimate strength for combined bending moments and shear forces. Therefore, a test program of CFS clip angle was recently conducted to investigate the behavior and strength of cold-formed steel clip angle subjected to combined bending moments and shear forces at different boundary conditions. The research included connection tests on clip angle. The testing method was adopted from the AISI S914 Test Standard for Joist Connectors Attached to Clod-Formed ...


Critical Design Criteria For Standard, Truncated, And Parallel Chords Cold-Formed Steel Trusses, Maelle van Thienen, Johannes Dimyadi, James B. P. Lim, G. Charles Clifton 2018 Missouri University of Science and Technology

Critical Design Criteria For Standard, Truncated, And Parallel Chords Cold-Formed Steel Trusses, Maelle Van Thienen, Johannes Dimyadi, James B. P. Lim, G. Charles Clifton

International Specialty Conference on Cold-Formed Steel Structures

The design of cold-formed steel trusses can be a very complicated and long repetitive process involving up to 28 load combinations added to serviceability checks depending on the design standards being used. This process is particularly tedious if a near optimal solution is required. Additionally, the risk of introducing human errors is usually quite high as it is a process often done by hand. FRAMECAD Structure is a niche software solution born from the desire to provide a complete solution for constructing with cold-formed steel by a company selling roll-forming machines. FRAMECAD Structure specialises on automating the calculations and design ...


Fire Resistance Of Cavity Insulated Light Gauge Steel Framed Walls, Anthony Deloge Ariyanayagam, Mahen Mahendran 2018 Missouri University of Science and Technology

Fire Resistance Of Cavity Insulated Light Gauge Steel Framed Walls, Anthony Deloge Ariyanayagam, Mahen Mahendran

International Specialty Conference on Cold-Formed Steel Structures

Light-gauge steel framed (LSF) wall systems are made of cold-formed steel studs and tracks and lined with gypsum plasterboards. They are mostly cavity insulated to provide acoustic and thermal performance. Cavity insulation delays the temperature rise across the wall as it restrains the heat transfer. This delays the ambient plasterboard surface temperature rise and thus improves the insulation failure time of LSF walls. However, LSF walls are also used as load bearing walls. Having cavity insulation causes the fire side temperatures to increase rapidly, resulting in a higher temperature gradient across the stud depth. This leads to higher thermal bowing ...


Stressed Skin Design Of Steel Sheeting Panels – Part 1: Shear Resistance And Flexibility Of Screw Lapped Joists, A. M. Wrzesien, James B. P. Lim, I. A. MacLeod, R. M. Lawson 2018 Missouri University of Science and Technology

Stressed Skin Design Of Steel Sheeting Panels – Part 1: Shear Resistance And Flexibility Of Screw Lapped Joists, A. M. Wrzesien, James B. P. Lim, I. A. Macleod, R. M. Lawson

International Specialty Conference on Cold-Formed Steel Structures

The shear resistance and flexibility of a steel roof diaphragm depend largely on shear resistance and slip flexibility of the single screw lap joint. In this paper, screw connections relevant to modern roof construction are investigated. The tests provided experimental values of shear/tearing resistance and joint flexibility of seam connections, cladding/purlin connections and purlin/rafter connections. The novel aspects of the experimental research include investigation of the behaviour of shear connections in 0.5mm thick sheeting and thick-to-thin connections in S550 high tensile steel. Overall, six series of tests were conducted and each test was repeated five times ...


Stressed Skin Design Of Steel Sheeting Panels – Part 2: Shear Panels With Sheeting Fixed On All 4 Sides, A. M. Wrzesien, James B. P. Lim, I. A. MacLeod, R. M. Lawson 2018 Missouri University of Science and Technology

Stressed Skin Design Of Steel Sheeting Panels – Part 2: Shear Panels With Sheeting Fixed On All 4 Sides, A. M. Wrzesien, James B. P. Lim, I. A. Macleod, R. M. Lawson

International Specialty Conference on Cold-Formed Steel Structures

In this paper, the strength and stiffness of different roof panels were investigated, in order to establish their ability to act as in-plane diaphragms for stressed skin design of cold-formed steel portal frames. A total of 6 roof panels, approximately 3 x 3m, were examined by testing with sheeting profiles fixed on 4 sides. A variety of sheeting profiles in two industry standard thicknesses of 0.5 and 0.7mm were tested, all using top-hat shaped purlins fixed with self-drilling, self-tapping screws. The experimental strength and stiffness of each panel were then compared against existing design methods. The Finite Element ...


Computational Modeling Of Joist-To-Ledger Connections In Cold-Formed Steel Diaphragms, Hernan Castaneda, M. Eng, Kara D. Peterson 2018 Missouri University of Science and Technology

Computational Modeling Of Joist-To-Ledger Connections In Cold-Formed Steel Diaphragms, Hernan Castaneda, M. Eng, Kara D. Peterson

International Specialty Conference on Cold-Formed Steel Structures

Cold-formed steel framed buildings can involve a range of options for framing systems, including balloon framing, platform framing, and ledger framing. Transfer of lateral forces from the diaphragms to the wall system (and ultimately to the ground) depends on the interactions within the wall-diaphragm connection, which is dependent on choice of framing system. In ledger framing, floor joists are hung from top of wall studs via a rim track (ledger) and clip angle connection. Recent experimental efforts at Johns Hopkins University studied the wall-diaphragm connection with the goal of quantifying its contribution to overall diaphragm response. Results from these experiments ...


Human-Structure Interaction In Cold-Formed Steel Floor Systems: An Analytical Perspective, Sigong Zhang, Lei Xu 2018 Missouri University of Science and Technology

Human-Structure Interaction In Cold-Formed Steel Floor Systems: An Analytical Perspective, Sigong Zhang, Lei Xu

International Specialty Conference on Cold-Formed Steel Structures

Designing cold-formed steel (CFS) floors to prevent annoying vibrations induced by human activities such as walking is still a challenge because human occupants not only generate impact loads but also behave as dynamical systems that interacting with structures. Such interaction, known as human-structure interaction (HSI), can be significant for lightweight floor systems particularly for the case when the mass of human occupants becomes comparable to those of the floors. The aim of this study was therefore to investigate the HSI in vibration of CFS floors subjected to human walking excitations by using the recently proposed damped plate-oscillator model to predict ...


Influence Of Gypsum Panels On The Response Of Cold-Formed Steel Framed Strap-Braced Walls, Sophie Lu, Colin A. Rogers 2018 Missouri University of Science and Technology

Influence Of Gypsum Panels On The Response Of Cold-Formed Steel Framed Strap-Braced Walls, Sophie Lu, Colin A. Rogers

International Specialty Conference on Cold-Formed Steel Structures

In cold-formed steel construction the steel frame is supplemented with either diagonal strap braces or structural sheathing panels (typically steel or wood) to provide overall stability to the structural system and to directly transfer lateral wind and seismic loads through to the foundation as per the design provisions found in AISI S240 (2015) and AISI S400 (2015). Gypsum panels are often specified to provide a fire-resistance rating for the CFS frame, as well as to ensure that adequate sound-proofing exists between adjacent rooms or building units. The engineer may choose to rely on this gypsum to provide additional lateral resistance ...


Web Crippling Behavior Of Cold-Formed Ferritic Stainless Steel Unlipped Channels Under Interior-One-Flange And End-One-Flange Loadings, Amir M. Yousefi, James B. P. Lim, G. Charles Clifton 2018 Missouri University of Science and Technology

Web Crippling Behavior Of Cold-Formed Ferritic Stainless Steel Unlipped Channels Under Interior-One-Flange And End-One-Flange Loadings, Amir M. Yousefi, James B. P. Lim, G. Charles Clifton

International Specialty Conference on Cold-Formed Steel Structures

The web crippling strength of cold-formed ferritic stainless steel unlipped channels subject to interior-one-flange and end-one-flange loading is considered in this paper. A total of 144 results are presented, comprising 36 laboratory and 108 numerical results. These results cover the cases of both flanges restrained and unrestrained to the load and reaction plates. Unlike other work in the literature, the numerical analysis in this paper uses nonlinear quasi-static finite element analysis with an implicit integration scheme, which has advantages over static and quasi-static with an explicit integration scheme analyses, particularly for post buckling predictions of unlipped channels subject to web ...


Shake Table Testing For Seismic Response Evaluation Of Cold-Formed Steel-Framed Nonstructural Architectural Components, Luigi Fiorino, Bianca Bucciero, Tatiana Pali, Ornella Iuorio, Raffaele Landolfo 2018 Missouri University of Science and Technology

Shake Table Testing For Seismic Response Evaluation Of Cold-Formed Steel-Framed Nonstructural Architectural Components, Luigi Fiorino, Bianca Bucciero, Tatiana Pali, Ornella Iuorio, Raffaele Landolfo

International Specialty Conference on Cold-Formed Steel Structures

The seismic response evaluation of cold-formed steel-framed nonstructural architectural components was investigated in an experimental campaign carried out within of the research study agreement between Knauf Gips KG and the Department of Structures for Engineering and Architecture of the University of Naples “Federico II”. The main objective of this research was to investigate the seismic performance of drywall nonstructural systems, i.e. cold-formed steel-framed indoor partition walls, outdoor façade walls and suspended ceilings. The present paper deals with the dynamic shake table tests. The tests were carried out on two different typologies of prototypes (Type 1 and Type 2) for ...


Numerical Simulation Of The Thermal And Mechanical Behavior Of Cold-Formed Steel Composite Floor Under Fire Conditions, Jixian Peng, Wei Chen, Jihong Ye, Zhengliu Wang 2018 Missouri University of Science and Technology

Numerical Simulation Of The Thermal And Mechanical Behavior Of Cold-Formed Steel Composite Floor Under Fire Conditions, Jixian Peng, Wei Chen, Jihong Ye, Zhengliu Wang

International Specialty Conference on Cold-Formed Steel Structures

Cold-formed steel (CFS) building structures are generally acknowledged as green and industrialized buildings, and the fire resistance behavior has become an important issue. Previous studies were mainly to investigate the fire performance of load-bearing CFS walls lined with different panels. Based on the finite element (FE) software package, ABAQUS, this paper presented a numerical simulation on a new CFS channel joist – ALC (autoclaved lightweight concrete) composite floor under fire conditions. Finally, the present numerical simulation of CFS composite floor in fire was compared with previous full-scaled fire experiments of such floors. The results showed that the temperature progression of the ...


Effect Of Connection Details On The Cyclic Behavior Of Nestable Screw Sidelaps, S. Torabian, H. Folk, Benjamin W. Schafer 2018 Missouri University of Science and Technology

Effect Of Connection Details On The Cyclic Behavior Of Nestable Screw Sidelaps, S. Torabian, H. Folk, Benjamin W. Schafer

International Specialty Conference on Cold-Formed Steel Structures

The connection strength and stiffness sensitivity of screwed sidelaps in nestable steel decks to screw installation details has been experimentally explored via cyclic testing. The cyclic behavior of sidelaps has been recently incorporated in the high fidelity modeling and seismic evaluation of the steel deck diaphragm in rigid wall - flexible diaphragm buildings, where “unzipping” a sidelap (loss of a significant number of sidelap connections along a deck edge) could significantly reduce the seismic performance of the whole diaphragm. A total of 24 monotonic and cyclic sidelap tests have been performed in the Thin-Walled Structures Laboratory at Johns Hopkins University. Two ...


Biaxial Bending Of Cold-Formed Steel Storage Rack Uprights – Part Ii: Design Methods, Nima Talebian, Benoit P. Gilbert, Cao Hung Pham, Hassan Karampour 2018 Missouri University of Science and Technology

Biaxial Bending Of Cold-Formed Steel Storage Rack Uprights – Part Ii: Design Methods, Nima Talebian, Benoit P. Gilbert, Cao Hung Pham, Hassan Karampour

International Specialty Conference on Cold-Formed Steel Structures

This paper uses the results from the parametric studies reported in the companion paper to verify the accuracy of different forms of published direct strength method (DSM) equations. They consist of the classical DSM equations and considering the inelastic reserve capacity into these equations, with and without an extended range of the cross-sectional slenderness. The verifications are made for local and distortional buckling modes. Results show that for all investigated buckling modes, the DSM results in better predictions when the inelastic reserve capacity is considered. The appropriate form of the DSM to predict the biaxial capacity of unperforated cold-formed steel ...


Biaxial Bending Of Cold-Formed Steel Storage Rack Uprights – Part I: Parametric Studies And Response, Nima Talebian, Benoit P. Gilbert, Cao Hung Pham, Romain Chariere, Hassan Karampour 2018 Missouri University of Science and Technology

Biaxial Bending Of Cold-Formed Steel Storage Rack Uprights – Part I: Parametric Studies And Response, Nima Talebian, Benoit P. Gilbert, Cao Hung Pham, Romain Chariere, Hassan Karampour

International Specialty Conference on Cold-Formed Steel Structures

This paper first introduces an advanced finite element model to determine the biaxial bending capacity of cold-formed steel storage rack upright sections. The model is found to accurately predict published experimental results with an average predicted to experimental capacity ratio of 1.02. Second, the validated model is used to run parametric studies and analyse the biaxial response of slender, semi-compact and compact unperforated storage rack upright cross-sections. Analyses are run for local and distortional buckling failure modes only. Ten and four different cross-sectional shapes are analysed for local and distortional buckling, respectively, and nine biaxial bending configurations are considered ...


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