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Articles 5521 - 5550 of 7869

Full-Text Articles in Civil and Environmental Engineering

Design Of C-Sections Against Deformational Lip Buckling, D. Buhagiar, J. C. Chapman, P. J. Dowling Oct 1992

Design Of C-Sections Against Deformational Lip Buckling, D. Buhagiar, J. C. Chapman, P. J. Dowling

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

Deformational lip buckling is one of the considerations affecting the choice of cross-section dimensions which were adopted for the C-sectlon chord members of a space frame system. No guidance on lip buckling of channel sections is given in the current British design specification. A method was therefore required for determining the lip buckling resistance of the members when subjected to axial compression or bending. A design procedure was formulated in which the lips are represented as a strut on an elastic foundation, the stiffness of which depends on the deformational stiffness of the section. The critical buckling stress and the …

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Local And Distortional Buckling Of Thin-Walled Beams, Reynaud Serrette, Teoman Pekoz Oct 1992

Local And Distortional Buckling Of Thin-Walled Beams, Reynaud Serrette, Teoman Pekoz

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

Recent research has characterized the behavior of panel beams with laterally unsupported compression flanges as either a complex local buckling mode or an overall buckling mode. Tests have shown that the behavior of the unsupported flange and web is similar to that of lateral buckling, except, rotation is enforced along the axis of the web and the tension flange--a behavior which may be described as distortional buckling. In the work described here, an analytical expression is presented for computing the elastic distortional buckling stress based on a model which treats the web and compression flange as an elastically restrained beam. …

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Tests On Full-Scale Roofing Systems, D. B. Moore Oct 1992

Tests On Full-Scale Roofing Systems, D. B. Moore

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

This report details an experimental investigation on three full-scale, cold-formed steel roofing systems. The test programme included both uniformly and variably distributed loadings representative of drifting snow. Comparisons between the performance of each roof subject to these distributions are made and recommendations for the design of roofs loaded with variably distributed loads are presented. Finally observations on the tests to failure are discussed.

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Contrasting Behaviour Of Thin Steel Roof Claddings Uder Simulated Cyclonic Wind Loading, Mahen Mahendran Oct 1992

Contrasting Behaviour Of Thin Steel Roof Claddings Uder Simulated Cyclonic Wind Loading, Mahen Mahendran

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

During an investigation on thin steel roof claddings under simulated cyclonic wind loading, it was found that trapezoidal roofing behaved quite differently to corrugated roofing due to the presence of overload cycles. This paper examines this contrasting behaviour of these two roofing profiles.

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On Design Of Profiled Sheets With Varying Cross Sections, Laszlo Horvath, Miklos Nemeti, Bela Veroci Oct 1992

On Design Of Profiled Sheets With Varying Cross Sections, Laszlo Horvath, Miklos Nemeti, Bela Veroci

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

A short review is given on the effective width concept and about its use for determining of the moment capacity of sheets. A modified method, taking into account the varying flexural rigidity along the spans, is described and illustrated on examples carried out on first -generation panels.

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Properties For Cellular Decks In Negative Bending, K. Balaji, Larry D. Luttrell Oct 1992

Properties For Cellular Decks In Negative Bending, K. Balaji, Larry D. Luttrell

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

Cellular roof and floor decks may be formed by attaching essentially flat sheets to a "hat-shapes" or to fluted profiles by spot welding along the contact lines. This leads to a closed cellular deck unit suitable for such purposes as in-floor power distribution or communication systems. In positive bending, or when the flat sheet is in tension and stable, cellular deck flexural properties can be determined following the American Iron and Steel Institute Cold Formed Steel Design Manual. When the flat sheet is in compression, its contribution is not described in the AISI Manual since it is not continuously connected …

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Composite Slabs Analyzed By Block Bending Test, Li An, Krister Cederwall Oct 1992

Composite Slabs Analyzed By Block Bending Test, Li An, Krister Cederwall

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

A new small-scale test, concrete block bending test, was carried out to determine the amount of shear stress and the slip distribution at the interface between the steel sheet and the concrete. The result was then used in the finite element analysis to predict the behaviour of composite slabs. Good agreement has been shown between the analytical results and measured results from the full-scale composite slabs.

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Repeated Point Loading Tests On Composite Slabs, Yoshimitsu Itoh, Kiyoshi Komori, Hiroshi Fujioka Oct 1992

Repeated Point Loading Tests On Composite Slabs, Yoshimitsu Itoh, Kiyoshi Komori, Hiroshi Fujioka

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

Single span and double span composite slab specimens were tested by subjecting them to concentrated repeated point loading. From the test results, it was found that the control of concrete cracks caused by the negative moment over the interior support is important in the latter case.

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Thermal Shielding Near Intermediate Supports Of Continuous Span Composite Slabs, Kees Both, Leen Twilt, Jan W. B. Stark Oct 1992

Thermal Shielding Near Intermediate Supports Of Continuous Span Composite Slabs, Kees Both, Leen Twilt, Jan W. B. Stark

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

At TNO Building and Construction Research, in close co-operation with the Eindhoven University of Technology, research is carried out on the behaviour of fire-exposed composite steel/concrete slabs, in the framework of a research project co-sponsored by the ECSC (European Community for Steel and Coal). The paper describes the state of the art of the research project.

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Design Of Channels Against Distortional Buckling, Y. B. Kwon, Gregory J. Hancock Oct 1992

Design Of Channels Against Distortional Buckling, Y. B. Kwon, Gregory J. Hancock

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

Thin-walled lip-stiffened channel columns composed of high strength steel may fail in a distortional mode involving movement of the lip stiffener perpendicular to the flange plate it supports. In this report, test results for a simple lipped channel section(CH1) and an intermediate stiffened channel section (CH2) of thickness of approximately 1.1 mm (0.043 in) and 550 MPa (79.8 ksi) steel and undergoing distortional or mixed local-distortional buckling failure are compared with different design methods. The design methods compared are Australian Standard AS1538, EC3 Partl/ Annexe A, the ECCS Recommendations and the AISI Specification. In addition, new methods based on a …

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Distortional Buckling Of Cold-Formed Steel Z-Section Columns, P. Charnvarnichborikarn, Dimos Polyzois Oct 1992

Distortional Buckling Of Cold-Formed Steel Z-Section Columns, P. Charnvarnichborikarn, Dimos Polyzois

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

Current North American guidelines for the design of cold-formed steel members consider the web of cold-formed steel sections under direct compression to be a fully stiffened element. This, however, may not be true if the flanges cannot provide sufficient restraint to the web. In this case, instability of the web element may cause distortional failure of the flange-edge stiffener component which may limit the load-carrying capacity of these sections with very little post-buckling strength being realized. In the present paper, the effect of web buckling on the load-carrying capacity of Z-sections with partially stiffened flanges is examined. The current design …

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Flexibly Connected Thin-Walled Space Frame Stability, Sundar Chandramouli, Shien T. Wang, George E. Blandford Oct 1992

Flexibly Connected Thin-Walled Space Frame Stability, Sundar Chandramouli, Shien T. Wang, George E. Blandford

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

The elastic stability of a cubic space frame composed of cold-formed steel members is studied for various bending and warping rigidities. A finite element technique is used to perform a parametric study of the elastic stability response of the flexibly connected frame. The results are compared with previously published observations for hot-rolled steel sections. The criterion used for deciding the significance of warping for hot-rolled sections is not found to be applicable to cold-formed sections.

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Shah Alam Sports Complex Design And Construction Of Unistrut Space-Frame Roof Structure, Khaldoun Mhaimeed, Sun Chien Hsiao Oct 1992

Shah Alam Sports Complex Design And Construction Of Unistrut Space-Frame Roof Structure, Khaldoun Mhaimeed, Sun Chien Hsiao

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

The Shah Alam Sports Complex is a $100-million multiuse sports facility in Selangor, Malysia. The main feature of this complex is a 72000-seat multisport stadium. Seating on both sides of the stadium will be covered by a pair of barrel-vaulted acrylic sky roofs. Each roof is structurally supported by a Unistrut Space-Frame which in tum is supported at three of its four edges with a free span of 931 feet (284 m). The frame is cantilevered from the back 226 feet (69 m) over the seats. In this paper, design philosophy to satisfy serviceability and ultimate limit states is discussed. …

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Some Applications Of Generalized Beam Theory, J. Michael Davies, Philip Leach Oct 1992

Some Applications Of Generalized Beam Theory, J. Michael Davies, Philip Leach

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

Generalised Beam Theory (GBT) has been developed by Professor R Schardt and his colleagues at the University of Darmstadt in Germany. The definitive reference at the present time is a recent German text(1) which describes the first-order theory. For the analysis of cold-formed sections, second-order theory may be required and this is less well documented. This paper will attempt to describe the principles involved and illustrate them by means of some practical examples. GBT unifies the conventional theories for the analysis of prismatic thin-walled structural members within a consistent notation. It then extends them into new territory. Conventional beam theory …

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Recent Developments In Cold Formed Steel, Robert W. Dannemann Oct 1992

Recent Developments In Cold Formed Steel, Robert W. Dannemann

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

During the last fifteen years the author has been working in the development of new products in cold formed steel, mainly in building applications. Cold formed steel makes possible practically an infinite variety of shapes, one for each need and function. This possibility is a continuous challenge for designers in finding, among many alternatives, the optimal solution for each problem. The author describes briefly a set of six proposals, which are either an already tested and proven product, or just its phase of design. As in any human doing, the author is conscious that these proposals may be accomplished and …

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The 1989 Edition Of The Canadian Cold Formed Steel Design Standard, R. M. Schuster Oct 1992

The 1989 Edition Of The Canadian Cold Formed Steel Design Standard, R. M. Schuster

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

This paper presents excerpts from the latest edition of the Canadian Standard for the design of cold formed steel structural members (CAN/CSA-SI36-M89). Considerable technical changes, reflecting the latest research developments, have been incorporated into this edition of the Standard. These changes are based on an increased understanding of the behaviour of cold formed steel structures, members, and elements and of cold formed steel as a structural material. Some of the more significant technical changes of the Standard are discussed in greater detail. Comparisons with the Standard's predecessor (CAN3-S136-M84), and whenever appropriate, with the 1986 AISI Specifications are also made.

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Axial Load Capacity Of Sheeted Cold-Formed C And Z Members, Neil J. Glaser, Richard C. Kaehler, James M. Fisher Oct 1992

Axial Load Capacity Of Sheeted Cold-Formed C And Z Members, Neil J. Glaser, Richard C. Kaehler, James M. Fisher

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

No abstract provided.

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Design Provisions For Cold-Formed Steel Column And Beam Columns, Committee On Specifications For The Design Of Cold-Formed Steel Structural Members Sep 1992

Design Provisions For Cold-Formed Steel Column And Beam Columns, Committee On Specifications For The Design Of Cold-Formed Steel Structural Members

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

No abstract provided.

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An Experimental Study Of Shear Wall Units, Atsuo Tanaka, Hiroshi Hasuda, Kazumi Sakae, Tutomu Tumori Aug 1992

An Experimental Study Of Shear Wall Units, Atsuo Tanaka, Hiroshi Hasuda, Kazumi Sakae, Tutomu Tumori

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

No abstract provided.

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Racking Performance Of Plasterboard-Clad Steel Stud Walls, B. Golledge, T. Clayton, G. Reardon Aug 1992

Racking Performance Of Plasterboard-Clad Steel Stud Walls, B. Golledge, T. Clayton, G. Reardon

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

It is recognised that structural design efficiency in domestic and similar structures can be improved when the composite behaviour and contribution of all materials in the permanent structure can be fully recognised in the structural design of the frame. The ability to achieve this Improvement is currently limited by the need 10 rely on empirical test results for standardised building elements when considering the composite behaviour of the entire structure. The existing test methodology for determining the shear strength of plasterboard lined steel stud walls leads to an excessively conservative design of the complete structure. Since the test configuration is …

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Test Of A Full Scale Roof Truss, Yao - Jie Guo, Shan-Feng Fang Aug 1992

Test Of A Full Scale Roof Truss, Yao - Jie Guo, Shan-Feng Fang

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

In order to obtain information of ultimate capacity and destructive characteristics of a roof truss, the test of a full scale roof truss was carried out based on the test results this article has analysed the destructive mechanism and presented the suggestions of improvement to design and fabrication.

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Down-Aisle Stability Of Rack Structures, J. Michael Davies Aug 1992

Down-Aisle Stability Of Rack Structures, J. Michael Davies

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

No abstract provided.

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Ccfss Technical Bulletin August 1992, Wei-Wen Yu Center For Cold-Formed Steel Structures Aug 1992

Ccfss Technical Bulletin August 1992, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Technical Bulletins (1993 - 2020)

No abstract provided.

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Ccfss News August 1992, Wei-Wen Yu Center For Cold-Formed Steel Structures Aug 1992

Ccfss News August 1992, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Newsletters (1999 - 2008)

No abstract provided.

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Shear Resistance Of Walls With Steel Studs, K. H. Klippstein, Thomas S. Tarpy Jr. Jun 1992

Shear Resistance Of Walls With Steel Studs, K. H. Klippstein, Thomas S. Tarpy Jr.

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

No abstract provided.

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Shear And Combined Bending And Shear Behavior Of Web Elements With Openings, Roger A. Laboube, Wei-Wen Yu, Ming-Yang Shan May 1992

Shear And Combined Bending And Shear Behavior Of Web Elements With Openings, Roger A. Laboube, Wei-Wen Yu, Ming-Yang Shan

CCFSS Library (1939 - present)

INTRODUCTION The purpose of this phase of the research project has been to investigate the behavior of a single web with web openings when subjected to either a constant shear force or a combined shear force and bending. The literature indicates that the main parameter that appears to effect the shear capacity is the ratio of web opening depth to web depth, a/h. Thus, the objective for this phase of the investigation was to experimentally determine the shear strength, and compare the tested shear strength with the computed shear strength as given by the AISI Specification for solid webs. The …

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Design Of Automotive Structural Components Using High Strength Sheet Steels Mechanical Properties Of Materials, Chi-Ling Pan, Wei-Wen Yu May 1992

Design Of Automotive Structural Components Using High Strength Sheet Steels Mechanical Properties Of Materials, Chi-Ling Pan, Wei-Wen Yu

CCFSS Library (1939 - present)

INTRODUCTION It is well known that the material properties of steels and the strengths of cold-formed steel members are affected by strain rate. Therefore, the research project sponsored by the American Iron and Steel Institute (AISI) at the University of MIssouri-Rolla during the period from January 1988 through December 1991 was concentrated on a study of the effect of strain rate on mechanical properties of sheet steels and the structural behavior and strength of cold-formed steel members subjected to dynamic loads. Because the previous UMR studies were limited only to the structural members such as stub columns and beams which …

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Stiffness Change Effects On Structure Control Systems, R. J. Falkenrath Apr 1992

Stiffness Change Effects On Structure Control Systems, R. J. Falkenrath

Opportunities for Undergraduate Research Experience Program (OURE)

This paper contains the results of a computer analysis performed on a two-dimensional model structure, in which the structure response was found under dynamic loading conditions. A structural dynamics program (BASIC) was modified to perform its analysis on a two-dimensional structure with a control system modelled into it. The modified program was then used to determine whether a change in the stiffness of the structure would cause the control algorithm to be ineffective for the structure. In light of the limited scope of the analysis (two-dimensional model with constant applied force on one story), the results indicate that a control …

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The Effect Of Flange Restraint On Web Crippling Strength, Bhavnesh H. Bhakta, Roger A. Laboube, Wei-Wen Yu Mar 1992

The Effect Of Flange Restraint On Web Crippling Strength, Bhavnesh H. Bhakta, Roger A. Laboube, Wei-Wen Yu

CCFSS Library (1939 - present)

PREFACE When considering the web crippling strength of a cold-formed steel member, the current edition of the AISI Specification for the Design of Cold-Formed Steel Structural Members does not distinguish between the behavior of a member having its flanges attached to a support member, and a member not attached to its support. To enhance the industry and design professional's understanding of web crippling, a pilot study was initiated at the University of Missouri-Rolla to explore the influence of flange attachment. The financial assistance for this research was provided by the Metal Building Manufacturers Association (MBMA) and the American Iron and …

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Test Methods For Mechanically Fastened Cold-Formed Steel Connections, Committee On Specifications For The Design Of Cold-Formed Steel Structural Members Feb 1992

Test Methods For Mechanically Fastened Cold-Formed Steel Connections, Committee On Specifications For The Design Of Cold-Formed Steel Structural Members

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

No abstract provided.

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