Tag Archive for Tag: Spacing

Tag: Spacing Air entrainment Effective use

Parameters of relevance in the production of serviceable concrete are: air content, spacing, specific surface, allowance for strength loss and interaction with cementitious materials. Before discussing these aspects in more detail, it must be noted that air entrainment does not enhance the performance of concrete made with aggregates susceptible to significant deterioration in freeze-thaw conditions (American Concrete Institute, 1994). Air

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Tag: Spacing Characteristics of Plate-Girder Stringer Bridges

For simple or continuous spans exceeding about 85 ft, plate girders may be the most economical type of construction. Used as stringers instead of rolled beams, they may be economical even for long spans (350 ft or more). Design of such bridges closely resembles that for bridges with rolled-beam stringers (Arts. 12.1 and 12.2). Important exceptions are noted in this and following articles. The

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Tag: Spacing Characteristics of Beam Bridges

Rolled wide-flange shapes generally are the most economical type of construction for shortspan bridges. The beams usually are used as stringers, set, at regular intervals, parallel to the direction of traffic, between piers or abutments (Fig. 12.1). A concrete deck, cast on the top flange, provides lateral support against buckling. Diaphragms between the beams offer additional bracing and also distribute loads laterally to the

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