The article “Concrete California Style,” in the June issue is a very interesting study on placing reinforcing steel in concrete. A similar article, “Solving Reinforcement Problems” (for building concrete frames in high seismic zones), was published in September 1983. This article mentions the placing techniques used (all rebar) resulted in an eight day pouring cycle per floor. It seems we took this to a higher level 23 years ago by using welded wire reinforcement (WWR) for column ties and beam stirrups on the Pacific Park Plaza project in the San Francisco area, where 23,000 square feet of floor per lift was completed every seven working days. Normally the placement of reinforcement determines the speed of the project. In this case it was recycling the placement of the flying forms that controlled the project speed.
— Bob Richardson R.C.
Richardson & Assoc.
Sun Lakes, Ariz.
Bob Richardson makes an excellent point. We have been discussing WWR used for confinement reinforcing in column ties and shear reinforcement in beams and girders for a long time. Bob has been involved on many building projects using new factors in seismic design—there is more interest in WWR for these applications. In the bridge world, we see where beam and girders, primarily precast/prestressed members have WWR rather than rebars for shear reinforcing. It would be nice to recognize WWR for even a greater time and material savings in both building and bridge projects.
— Roy Reiterman
Welded Wire Reinforcement Institute