Fully prestressed concrete members are defined by a section entirely in compression at the serviceability limit state. True or false?

Question

Fully prestressed concrete members are defined by a section entirely in compression at the serviceability limit state.  True or false?

BlackTom AI · Accepted Answer

The question asks about the defining characteristic of fully prestressed concrete members at the serviceability limit state.

Option 1: True. This statement aligns with the conventional definition of a fully prestressed member, where the prestressing forces are designed so that, under service loads, the entire cross-section remains in compression (no tensile stress anywhere in the section). This ensures that cracking due to service loads is avoided and the member behaves more like a continuous, fully bonded compressive member.

Option 2: False. This would be incorrect because if a member were not entirely in compression under service loads, some portion of the section would experience tension, which contradicts the defining feature of a fully prestressed member. In prestressed concrete design, achieving a state with no tension at service is a key goal (at least under the typical bending and load scenarios considered); claiming that full compression is not required would misstate the fundamental concept.

To further clarify, in a partially prestressed member, there may be zones in the cross-section that remain or become tensile under service loads, whereas in a fully prestressed member, the tendon forces are chosen to ensure that the resulting stress distribution keeps the entire section compressed within the serviceability limit state. This distinction is essential for distinguishing fully prestressed members from simply prestressed or non-prestressed members.

In summary, the idea that a fully prestressed concrete member has its entire cross-section in compression at service conditions is the standard definition and is what the statement asserts.

STRCTENG 303 Quiz No 6

Fully prestressed concrete members are defined by a section entirely in compression at the serviceability limit state. True or false?

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