PRECAST CONCRETE Materials, Manufacture, Properties and Usage

PRECAST CONCRETE Materials, Manufacture, Properties and Usage

The adoption of the limit-state philosophy as the basis of current
codes of practice for the design of concrete structures expresses
the conviction that this philosophy is capable of leading to safer
and more economical design solutions. After all, designing a
structural concrete member to its ultimate limit state requires the
assessment of the load-carrying capacity of the member and this
provides a clearer indication of the margin of safety against
collapse. At the same time, the high internal stresses which
develop at the ultimate limit state result in a reduction of both the
size of the member cross-section and the amount of reinforcement
required to sustain internal actions. (Admittedly, the
latter economy and, of course, safety itself are dependent on the
actual factor of safety adopted; nevertheless, the more accurate
estimate of the true failure load provides an opportunity to reduce
the uncertainties reflected in the factor of safety in comparison
with, say, elastic design calculations.)

The design of a structural concrete member for ultimate strength
requires the availability of methodologies capable of yielding
realistic predictions of the member’s ultimate characteristics,
such as, for example, flexural capacity, shear capacity, ductility,
etc. The efficiency of the resulting design solutions, therefore, is
clearly dependent, to a large extent, on the ability of the
methodology used to assess accurately these characteristics.


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