Shrinkage and Creep in Indeterminate Structures


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Title: Shrinkage and Creep in Indeterminate Structures

Author(s): Kin Leung Lai and Robert F. Warner

Publication: Special Publication

Volume: 55


Appears on pages(s): 305-320

Keywords: computer deflection; girders; distribution; moment Pr s ; ograms; continuous beams; creep properties; oad balancing methods; loads (fources); memen reinforced concrete; t

Date: 8/1/1978

An analytic study was made of the effects of creep andshrinkage in lightly loaded continuous girders and frames by means of computer programs which were developed to simulate the timevarying behavior of a structure under sustained variable loading. Variations in the internal moments with time were found to be very large, a 50 percent increase or decrease in the maximum moment being not unusual. Concrete shrinkage was found to have a much more important effect on long-term moment redistribution than creep. The quantity and distribution of reinforcement also had a critical effect, both on moment redistribution and long-term deflection.