外文翻譯——預(yù)應(yīng)力混凝土建筑-建筑結(jié)構(gòu)-展示頁(yè)
2025-05-27 05:26本頁(yè)面
【正文】 buildings. These advantages include the following: Structural strength。 Structure rigidity。 Mold ability, into desired forms and shapes。 Architectural treatment of surfaces。 Heat insulation。 Availability, through use of local materials and labor to a high degree. Most of the above are also properties of conventionally reinforced concrete. Presrressing, however, makes the structural system more effective by enabling elimination of the technical of difficulty, ., cracks that spoil the architectural treatment. Prestressing greatly enhance the structure efficiency and economy permitting longer spans and thinner elements. Above all, it gives to the architectengineer a freedom for variation and an ability to control behavior under service conditions. Although prestressed concrete construction involves essentially the same consideration and practices as for all structures, a number of special points require emphasis or elaboration. The construction engineer is involved in design only to a limited extent. First, he muse be able to furnish advice to the architect and engineer on what can he done. Because of his specialized knowledge of techniques relating to prestressed concrete construction, he supplies a very needed service to the architectengineer. Second, the construction engineer may be made contractually responsible for the working drawings。 for example, the design may indicate only the center of gravity of prestressing and the effective prestress force. The working drawing will have to translate this into tendons having finite physical properties and dimensions. If the center of gravity of prestressing is a parabolic path then, for pretensioning, and approximation by chords is required, with holddown points suitably located. The putation of prestress losses, form transfer stress to effective stress, must reflect the actual manufacturing and construction
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