Tag Archive for Tag: Steel

Tag: Steel Detection of ruptures in pre-stressing steel

Radiography, time domain reflectometry (TDR) and magnetic methods are in principle suitable for detecting corrosion of steel tendons. In practice, radiography is normally too expensive and requires access to both sides of the prestressed member. The TDR method also fails to detect some tendons because their proximity means they are connected electrically with one another,84 but it works very well with

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Tag: Steel Corrosion testing of prestressing steel Historical development

The technological development of prestressing steels was accompanied by research to establish parameters and test methods for susceptibility to H-SCC. Early prestressed concrete structures mostly used hot rolled steel rods with a yield stress around 600 N/mm2 and a tensile strength of 900 N/mm2. This steel quality, St 600/900, does not differ much from St 835/1030 used today, except that

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Tag: Steel Production, dimensions and types of delivery of prestressing steel

The yield strength (0.2% proof stress) of prestressing steels should be high to make their use effective and economical. Depending on the product type, different treatments can be used to increase the strength. Prestressing steels of up to 16mm diameter are produced in wire rolling mills, wound into coils and used as wires or stranded wires. Diameters between 16 and

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Tag: Steel Types and metallurgical characteristics of prestressing steel

Requirements and properties Prestressing steels10 are used in prestressed concrete elements which are under tensile stresses due to their dead weight and service loads.11 The prestressing applied should prevent or permit only to a limited extent (partial prestressing) tensile stresses occurring within the concrete. Prestressing steels are subjected to static stresses on which dynamic components are sometimes superimposed. The steels

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Tag: Steel Rusting of steel

Metallic corrosion processes in general, and the rusting of steel in particular, are by nature electrochemical. They therefore require an electrolyte, generally an aqueous solution that enables coupled anodic and cathodic reactions to occur, allowing the ions formed to migrate between the anodic and cathodic sites on the metal surface. This mechanism, which involves the transference of ions through the

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Tag: Steel Classification of steel elements in compression

Because of local buckling, the ability of a steel flange or web to resist compression depends on its slenderness, represent by its breadth/thickness ration. In design to Eurocode 4, as in Eurocode 3, each flange or web in compression is placed in one of four classes. The highest (least slender) class is Class 1(plastic). The class of a cross-section of a composite beam

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Tag: Steel Methods of analysis and design

The purpose of this section is to provide a preview of the principal methods of analysis used in this volume, and to show that most of them are straightforward applications of methods in common use for steel or for concrete structures. The steel designer will be familiar with the elementary elastic theory of bending, and the simple plastic theory in which the

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Tag: Steel Composite beams and slabs

The design of structures for buildings and bridges is mainly concerned with the provision and support of load-bearing horizontal surfaces. Except in long-span bridges, these floors or decks are usually made of reinforced concrete, for no other material has a better combination of low cost, high strength, and resistance to corrosion, abrasion, and fire. The economical span for a reinforced concrete slab is

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Tag: Steel Steel Roof Deck

Various types of steel roof deck are available and may be classified in accordance with recommendations of the Steel Deck Institute (SDI). All types consist of long, narrow sections with longitudinal ribs at least 11⁄2 in deep and spaced about 6 in on centers (Fig. 8.14). Other rib dimensions are shown in Fig. 8.14a to c for some standard styles.   Types of Steel

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Tag: Steel Field-Painting Steel

There is some question as to justification for protecting steelwork embedded in masonry or in contact with exterior masonry walls built according to good workmanship standards but not impervious to moisture. For example, in many instances, the masonry backing for a 4-in brick wall is omitted to make way for column flanges. Very definitely, a 4-in wall will not prevent penetration of water. In

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