Engineering Commons^™

Use Of Mill Certficates To Establish Material Properties In Testing Of Colf-Formed Steel Compoenents, Tim Stauffer, Paul Mcentee

CCFSS Library (1939 - present)

Testing is often used to establish the available strength of cold-formed steel components. The evaluation of this test data requires adjustment based on the material properties of the tested components to account for values that exceed the minimum specified values. Currently, it is required that this adjustment be based on samples taken from the tested specimen or the flat sheet used to form the test specimen. However, in many cases it is not practical to obtain these samples. Instead, it is desired to permit an alternate that allows the use of mechanical properties reported by the steel supplier. The purpose …

Buckling Of Profiled Steel Diaphragms, Rao V. Nunna

CCFSS Library (1939 - present)

No abstract provided.

Product Technical Information, Steel Stud Manufacturers Association

CCFSS Library (1939 - present)

No abstract provided.

Siding Attachment To Cold-Formed Steel Walls Through Varying Layers Of Foam Insulation, Newport Ventures, Inc., Applied Residential Engineering Services

CCFSS Library (1939 - present)

When insulating an exterior wall, more and more codes are requiring continuous insulation on the exterior of the studs to reduce the effect of thermal bridging. As energy codes continue to become more stringent, the thickness of the continuous installation has increased. Although wood and steel are both impacted, the requirements generally are higher for steel framing.

A significant implementation challenge caused by increasingly higher levels of continuous insulation is the lack of specifications for the type of fastener and siding installation details that should be used when installing thicker levels of insulation. Thus, the engineer, architect, builder, and contractor …

Steel Sheet Sheathing Options For Cold-Formed Steel Framed Shear Wall Assemblies Providing Shear Resistance - Phase 2, Cheng Yu, Yujie Chen

CCFSS Library (1939 - present)

Monotonic and cyclic tests on cold-formed steel shear walls sheathed with steel sheets on one side were conducted to (1) verify the published nominal shear strength for 18-mil and 27-mil steel sheets; and (2) investigate the behavior of 6-ft. wide shear walls with multiple steel sheets. This project is the continuation of a completed project titled “Steel Sheet Sheathing Options for Cold-Formed Steel Framed Shear Wall Assemblies Providing Shear Resistance” by Yu (2007). This Phase 2 project confirms the discrepancy in the published nominal strength of 27-mil sheets discovered by the Phase 1 project, and proposes new values. The project …

Section Properties For Cellular Decks Subjected To Negative Bending, Gregory L. Snow, W. Samuel Easterling

CCFSS Library (1939 - present)

Cellular decks are formed by attaching cold-formed “hat-shaped” deck sections on top of cold-formed steel sheets. The attachment is typically made using resistance spot welds spaced at a specific interval. The void left underneath the deck flutes and above the steel sheet provides a convenient means for the distribution of wiring and data cables throughout building systems. The section properties of cellular decks subjected to positive bending can be determined using the provisions of Chapter B of the 2001 AISI Specification (AISI, 2001). However, the provisions of Chapter B do not apply to cellular decks subjected to negative bending unless …

Strength Of Arc-Spot Welds Made In Single And Multiple Steel Sheets, Gregory L. Snow, W. Samuel Easterling

CCFSS Library (1939 - present)

The objective of this research was to establish a relationship between arc spot weld shear strength and the arc time used to form the weld. Lap shear tests were performed on both 3/4 in. and 5/8 in. nominal diameter welds. Each weld was formed in one-, two-, or four-layers of sheet steel ranging from 22 gauge (0.028 in.) to 16 gauge (.057 in.). Three distinct time series were tested for each unique weld size, thickness of sheet steel and layer configuration. The first of these series were the full-time welds. The two remaining series, 2/3-time and 1/3-time welds, had arc …

Reinforcement Schemes For Cfs Joists Having Web Openings, K. S. Sivakumaran

CCFSS Library (1939 - present)

No abstract provided.

Steel Sheet Sheathing Options For Cfs Framed Shear Wall Aseemblies Providing Shear Resistance, Cheng Yu, Hitesh Vora, Tony Dainard, Pradeep Veetvkuri

CCFSS Library (1939 - present)

In cold-formed steel construction, stud walls covered with steel sheet sheathing is an available option to resist lateral loads such as those caused by wind and earthquakes. The current American Iron and Steel Institute (AISI) Standard for Cold-Formed Steel Framing - Lateral Design 2004 Edition provides nominal shear strength for a limited range of steel sheet sheathed shear wall configurations. This report presents a research project developed to add values for 0.030-in. and 0.033-in. steel sheet sheathed shear walls with 2:1 and 4:1 aspect ratios and 0.027-in. sheet steel shear walls with 2:1 aspect ratio and 6-in., 4-in., 3-in., and …

Testing And Evaluation Of Light Gauge Steel Frame / 9.5 Mm Csp Wood Panel Shear Walls, David Rokas

CCFSS Library (1939 - present)

The use of light gauge steel framing elements sheathed with wood plywood or oriented strand board are becoming more common in the construction of structural shear walls for low-rise platform frame structural systems in Canada. Canadian standards and codes do not currently outline design methods for this type of wall system. Therefore, research at McGill University is underway to help develop design parameters for seismic and wind loading that can be used in conjunction with the 2005 National Building Code of Canada for this type of shear wall system. The research is based on the monotonic and reversed cyclic testing …

Development Of Cost-Effective, Energy Efficient Steel Framing: Thermal Performance Of Slit-Web Steel Wall Studs, Nahb Research Center

CCFSS Library (1939 - present)

No abstract provided.

Development Of Cost-Effective, Energy Efficient Steel Framing: Structural Performance Of Slit-Web Steel Wall Studs, Nahb Research Center

CCFSS Library (1939 - present)

No abstract provided.

Steel Deck Institute Diaphragm Design Manual, Third Edition, Larry D. Luttrell

CCFSS Library (1939 - present)

No abstract provided.

Corrosion Of Galvanized Fasteners Used In Cold-Formed Steel Framing, American Iron And Steel Institute

CCFSS Library (1939 - present)

This research program investigated the potential for corrosion of galvanized fasteners used in cold-formed steel framing by exposing test samples to a variety of environmental conditions frequently found in Hawaii and elsewhere. The results of this research will aid in the evaluation of galvanized fasteners in various exposure conditions. Five field enclosures were constructed on the island of Oahu at coastal locations on both windward and leeward shores, and in the interior of the island. Each field enclosure represented various aspects of typical cold-formed steel construction and was equipped with a complete weather station. This report details the design, construction …

A Summary Of L-Header Designs Using The Aisi Header Design Standard, Dean Peyton

CCFSS Library (1939 - present)

No abstract provided.

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 …

Testing Of Steel L-Headers On Wood Walls, Nahb Research Center

CCFSS Library (1939 - present)

No abstract provided.

Metal Drywall Framing And Accessories, Dale Industries

CCFSS Library (1939 - present)

No abstract provided.

Light Gage Steel Framing, Dale Industries

CCFSS Library (1939 - present)

No abstract provided.

Investigation Of Inflection Points As Brace Points In Multi-Span Purlin Roof Systems, Michael R. Bryant, Thomas M. Murray

CCFSS Library (1939 - present)

No abstract provided.

Design Of Cold-Formed Steel Structural Members And Connections For Cyclic Loading (Fatigue), Roger A. Laboube, Wei-Wen Yu

CCFSS Library (1939 - present)

PREFACE Fatigue in a structural steel member or connection is the process of initiation and subsequent growth of a crack under the action of a cyclic or repetitive load. The fatigue process commonly occurs at a stress level less than the static failure condition. Although fatigue design guidelines have existed for hot-rolled steel structural members and connection, there have been no generally accepted design guidelines in the AISI Specification for addressing fatigue in a cold-formed steel member or connection. Therefore, the intent of the research reported herein was to develop general design rules for design of cold-formed steel members and …

Determination Of The Tensile And Shear Strengths Of Screws And The Effect Of Screw Patterns On Cold-Formed Steel Connections, Marc Allen Sokol, Roger A. Laboube, Wei-Wen Yu

CCFSS Library (1939 - present)

PREFACE This report summarizes two studies related to the design of cold-formed steel connections. The study topics included the creation of a test standard for determining the strength of a screw, and the determination of the strength of a screw connection. A standard test protocol does not exist for determining the strength of a screw. Today, manufacturers use test protocols developed for their products. Thus, there is no consistency in defining the structural performance of a screw. A test standard has been developed. The standard used as its model the American Society of Testing and Material's F 606, Standard Test …

Design Of Automotive Structural Components Using High Strength Sheet Steels Effect Of Strain Rate On Material Properties And The Structural Strength Of Cold-Formed Steel Members, Wei-Wen Yu

CCFSS Library (1939 - present)

PREFACE The research work on automotive components conducted at the University of Missouri-Rolla under the sponsorship of the American Iron and Steel Institute began in 1982. During the first six years, studies were made on the basis of static loading. Since May 1988, studies have been concentrated on the effect of strain rate on material properties and the structural strength of cold-formed steel members along with the behavior of hybrid members. The research findings for the period from 1988 through 1997 are summarized in this report. Special thanks are expressed to General Motors Corporation (Dr M. Y. Sheh, Mr. B. …

Design Of Automotive Structural Components Using High Strength Sheet Steels Transformed Section Method For The Calculation Of Yield Moment Of Cold-Formed Steel Hybrid Beams, Chi-Ling Pan, Wei-Wen Yu

CCFSS Library (1939 - present)

INTRODUCTION It has been recognized that material properties and stress-strain relationships of sheet steel can be influenced by the strain rate. Because the member strength is also influenced by dynamic loading, a large number of research projects were conducted for a variety of structural members under specified loading conditions during past three decades. In cold-formed steel design, local buckling is one of the major design features because of the use of large width-to-thickness ratios for compression elements. For the purpose of determining the load-carrying capacity of automotive components, the effective width approach has been used. In view of the fact …

Spacing Of Connections In Compression Elements For Cold-Formed Steel Members (Beams), Michael L. Jones, Roger A. Laboube, Wei-Wen Yu

CCFSS Library (1939 - present)

PREFACE The spacing of connectors in compression elements of built-up flexural members was evaluated both experimentally and analytically at the University ofMissouri-Rolla (UMR) under the sponsorship of the American Iron and Steel Institute. A computational model was developed for determining the bending capacity of single-fluted sections with cover plates that do not have edge stiffeners. The results of the investigation are presented and recommendations are made for design of single-flute cross sections having cover plates without edge stiffeners. Previous research developments by Yener, at Purdue University, and Luttrell, at the University of West Virginia, were compared to the UMR experimental …

Behavior Of Web Elements With Openings Subjected To Linearly Varying Shear, Matthew R. Eiler, Roger A. Laboube, Wei-Wen Yu

CCFSS Library (1939 - present)

PREFACE An experimental investigation of the shear buckling limit state was conducted on single web, cold-formed steel flexural members with web openings. The purpose of the investigation was to develop a better understanding of the behavior of web elements having a web opening, and to propose appropriate design recommendations based on the observed behavior. The present AlSI ASD and LRFD specifications do not contain design provisions for webs with openings, thus the findings of this study will aid in enhancing the shear design provisions. The test specimens, constructed from C-sections, were subjected to linearly varying shear resulting from the application …

Screw And Welded Connection Behavior Using Structural Grade 80 Of A653 Steel (A Preliminary Study), Exaud N. Koka, Wei-Wen Yu, Roger A. Laboube

CCFSS Library (1939 - present)

This Fourth Progress Report presents the results of 56 connection tests conducted at the University of Missouri-Rolla during February-April, 1997. The intent of this limited test program was to gain an understanding of the general behavior characteristics of connections in grade 80 steels. No attempt was made to develop an indepth understanding of the connection behavior, which would be necessary to propose complete or comprehensive design recommendations. The performance and behavior of screw and welded connections in low-ductility steel were studied by testing to failure 36 specimens using self-drilling screws, 16 welded connections using either transverse or longitudinal fillet welds, …

Strength Of Flexural Members Using Structural Grade 80 Of A653 Steel (Web Crippling Tests), Shaojie Wu, Wei-Wen Yu, Roger A. Laboube

CCFSS Library (1939 - present)

This Third Progress Report summarizes the web crippling tests of 148 specimens and evaluates the test results along with an additional 114 web crippling tests which were reported in 1986 as part of a project on Design of Automotive Structural Components Using High-Strength Sheet Steels. The 148 web crippling tests conducted in this program are the part of the overall project on Strength of Flexural Members Using the Structural Grade 80 of ASTM A653 Steel (former ASTM A446 Grade E Steel). The objectives of the ongoing project are to study the strength and structural performance of flexural members as affected …

Additional Shear Wall Values For Light Weight Steel Framing, American Iron And Steel Institute

CCFSS Library (1939 - present)

No abstract provided.

Design Of Automotive Structural Components Using High Strength Sheet Steels Mechanical Properties Of Materials (Aging Effect), Shaojie Wu, Chi-Ling Pan, Wei-Wen Yu

CCFSS Library (1939 - present)

INTRODUCTION It has been known for years that mechanical properties of thin sheet steels, such as yield strength, tensile strength, and ductility, are affected by aging (Chajes et al. 1963, Hertzberg 1989, Yu 1991). The aging effect on mechanical properties can be described as follows. For a virgin steel that is initially loaded in tension beyond its yield strength and into strain hardening state and then unloaded to zero stress, the yield and tensile strengths of the steel increase while the ductility of the steel decreases if the steel is reloaded in tension again after a period of time from …