scope:

The recommendations supplement the general requirements for reinforced concrete and prestressed concrete design and construction given in AC1 318-99, AC1 350-01, and AC1 301. Design and construction recommendations cover the following elements or components of circularwrapped prestressed concrete structures:

I. Floors

Reinforced concrete

II. Floor-wall connections

Hinged;

Fixed;

Partially fixed;

Unrestrained; and

Changing restraint.

III. Walls 

Cast-in-place concrete walls with steel diaphragms or vertical prestressing;

Shotcrete walls with steel diaphragms; and

Precast concrete wails with steel diaphragms.

IV. Wall-roof connections 

Hinged;

Fixed;

Partially fixed; and

Unrestrained.

V. Roofs 

Concrete dome roofs with prestressed dome ring, constructed with cast-in-place concrete, shotcrete, or precast concrete; and

Flat concrete roofs.

VI. Wall and dome ring prestressing systems

Circumferential prestressing using wrapped wire or strand systems; and

Vertical prestressing using single or multiple highstrength strands, bars, or wires.

Objective

 This report provides guidance for individuals responsible for the design and construction of circular prestressed concrete structures by recommending practices used in successful structures.