Effects of Support Settlement in Concrete Members

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Title: Effects of Support Settlement in Concrete Members

Author(s): M. K. Tadros,A. Yousef, and Y. S Joo

Publication: Special Publication

Volume: 117

Issue:

Appears on pages(s): 185-214

Keywords: beams (supports); bridges (structures); computer programs; cracking (fracturing); creep properties; settlement (structural); shrinkage; stiffness; strains; stresses; structural analysis; Structural Research

Date: 10/1/1989

Abstract:
Deals primarily with statically indeterminate beams where settlement of the supports can produce stresses. A method of estimating the effects of support settlement is presented. The method accounts for the fact that soil consolidation and the corresponding support settlement often develop over an extended period of time. The method also demonstrates that creep of concrete can reduce the ultimate settlement-induced stresses in uncracked members by as much as 60 percent of the elastic values. Furthermore, flexural cracking of concrete results in reduction of the member stiffness. This corresponds to further relief of the settlement-induced stresses. Field studies on the effects of settlement in several bridges are presented. The relationship between the amount of settlement and its structural effects is illustrated.