Koujirou ABE
Effect of drying shrinkage on the time-dependent deformation of reinforced concrete member
Takumi SIMOMURA
1.Prediction of the introduction of time-dependent deformation and stress under constant load and Loss of prestress and cracks and Prediction of crack width, it is important in the design of reinforced concrete structures.
2.Prediction is difficult because the interaction effect of material properties in a complex time-dependent deformation of concrete and rebar.
3.Prediction model is necessary to take this into account.
4.In this study, we sustained loading test.Drying conditions drying the upper half and drying the lower half and non-drying and all-drying.
5.To consider Tensile stress and compressive stress and the drying effect on the deformation.
6.Analyzed, were compared.
7.Examination item is elastic deformation and tensile stiffness degradation due to cracking and drying shrinkage and basic creep and Tensile stiffness of concrete after cracking and creep adhesion affect the bending deformation.
8.Be explained time-dependent deformation at a constant load after the occurrence of cracks in bending. Deflection of the RAD is the largest.
It is due to the influence of tensile stiffness degradation due to drying shrinkage and the underside of the increase of deflection due to shrinkage of the upper surface drying.
9.Be explained the moment when the deformation in loading before cracking. RLD and RAD is the moment a large amount of elastic deformation.
It is due to the influence of tensile stiffness degradation due to drying shrinkage.
10.Be explained time-dependent deformation at a constant load in before the occurrence of cracks.
Basic creep strain due to creep can be confirmed from the RAS.However, the basic creep is very small.
11.Therefore, the basic creep before the occurrence of cracks is assumed to be negligible in this study.
12.In the analysis, that take into account the elastic deformation and tensile stiffness degradation due to drying shrinkage and drying shrinkage.
Make a comparison with the experimental result.
13.Be explained time-dependent deformation at a constant load after the occurrence of cracks in bending.RAD is the largest changes over time.
14.Be explained the moment when the deformation in loading before cracking. The moment elastic deformation of the RAD and RLD is greater.
15.However, since they do not have to take into account basic creep and Tensile stiffness of concrete after cracking and creep adhesion, the actual deformation can not be reproduced.
16.In the future, it is necessary to perform analysis based on these.
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