Reshoring a Multistory Concrete Frame -a Practical Approach


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Title: Reshoring a Multistory Concrete Frame -a Practical Approach

Author(s): W.. Thomas Scott

Publication: Special Publication

Volume: 90


Appears on pages(s): 131-156

Keywords: columns (supports); computer programs; concrete construction; concrete slabs; flat concrete plates; framing systems; high-rise buildings; loads (forces); reinforced concrete shoring; structural analysis

Date: 4/1/1986

As the speed of construction of concrete frame structures has increased and the sophistication of design has improved, there has been an increased need for a more thorough understanding as to the way construction loads are disbursed into the structure. During the 60's and 70's, several designers and researchers proposed methods of analyzing the loads in multistory structures during construction. A computer program employing one of these methods has been developed. In the 1982 PCA conference the author used the results of this proqram to show how the number of levels of equipment, cycle time, and attained concrete strength affected the number of levels of reshores required. This paper describes in detail the process used to calculate the reshorinq requirements for a 35 story flat plate structure built using a three day construction cycle. The discussion includes the practical implications of providing reshorinq for a mild steel structure. The hand calculation procedure presented parallels the computer program and is sufficiently detailed to provide the reader a practical procedure that can be used on the next project.