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Study of Shear Lag Effect in Continuous Concrete Box Beam Erected Span by Span Taking into Account of Creeping Effect
Pages: 53-57
Year: Issue:  4
Journal: World Bridges

Keyword:  continuous beam bridgebox beamcreepshear lag effectconstruction span by spansecondary stressstudy;
Abstract: To examine the influence of creep on the shear lag effect of concrete box beam bridge constructed span by span,the calculation formula of the concrete creep secondary internal force of a two-span continuous beam erected span by span taking into consideration of the shear lag effect was established,based on the energy variational method and concrete creeping theory.And a cast-in-situ concrete box beam bridge erected span by span with span arrangement of 30m+30m was cited as an example in the calculation.The results of the study show that for the continuous beam bridge erected span by span experiencing systematic transformation during the process of construction,the creep secondary internal force caused the increase of hogging moment,but the reduction of the positive bending moment.However,when the creeping effect was considered,the shear lag effect in the cross section showed the sign of abating.In the sample structure of the calculation,the maximum shear lag coefficient in the hogging moment zone of the bearings deceases by 20.26%,while the shear lag coefficient in the positive bending moment zone in the midspan increases by 2.1%.
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