| To predict possible impacts of creep and shrinkage on continuous composite beams during long-term service, the analysis is conducted for the secondary internal forces of creep and shrinkage based on the basic principle of force method and the creep constitutive equation of concrete, considering different status of creep and shrinkage characteristics of concrete in adjacent span, span and load of two-span continuous composite beams. The results show that, without considering shrinkage effect, the secondary bending moment of creep at the middle support is 0 when the creep characteristics of concrete or span of the adjacent span of the two-span continuous composite beams is the same. And the secondary bending moment of creep varies with time when the creep characteristics and span of the adjacent span are different, or the creep characteristics of the adjacent span and loading methods are different. When the shrinkage effect is taken into account, the secondary bending moments of shrinkage are generated in all cases. The change degree of the secondary bending moment of the support is related to the difference of creep coefficient, the difference of aging coefficient, span difference and load difference of the two spans. The redistribution of internal force shifts from the side with greater creep to the side with smaller creep. The greater the difference of creep characteristics between the two spans, the higher the redistribution value and the greater the secondary bending moment of creep. And vice versa, when the difference of creep characteristics between the two spans tends to be minimal, the creep secondary internal force of the support tends to be 0. The secondary bending moment of the support is affected by the stress redistribution inside the section, and is related to the creep coefficient and aging coefficient of concrete and redistribution coefficient. The proposed analytic method can be used to analyze the internal forces of the continuous composite beam under the dual coupling of the section and the structure, and the parameters of the formula can be compiled into a table, which is convenient for engineering application. |
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