ABSTRACT
This research, therefore, pursued this third option, by investigating potential deep section shapes. Profiles chosen were those which could be formed by reshaping a common existing profile. This clearly minimises the cost of additional rollers if the profile is factory produced. Alternatively, on-site equipment could be devised to modify the existing profile immediately prior to installation. This latter method permits more economic transportation to site since the existing reentrant profile can be nested compactly. PROFILE CHOICE & MANUFACTURE The profile types investigated are illustrated in Figure 2. The most common reentrant profile was used as a basis, as it had significant advantages over existing trapezoidal profiles when re-formed into a deeper profile. It provides better adhesion between the sheet and the concrete, and gives better shear-bond characteristics. The underside of the sheets include slots into which wedges may be fixed, providing an excellent means of supporting service ducts. A trapezoidal profile, however, would give significant problems with vertical separation of the concrete from the sheet in bending.
