Abstract
Lifetime service of Reinforced Concrete (RC) structures is of major interest. It depends on the action of the superstructure and the response of soil contact at the same time. Therefore, it is necessary to consider the soil-structure interaction in the safety analysis of the RC structures to ensure reliable and economical design. In this paper, a finite element model of soil-structure interaction is developed. This model addresses the effect of long-term soil deformations on the structural safety of RC structures. It is also applied to real RC structures where soil-structure interaction is considered in the function of time. The modeling of the mechanical analysis of the soil-structure system is implemented as a one-dimensional model of a spring element to simulate a real case of RC continuous beams. The finite element method is used in this model to address the nonlinear time behavior of the soil and to calculate the consolidation settlement at the support-sections and the bending moment of RC structures girders. Numerical simulation tests with different loading services were performed on three types of soft soils with several compressibility parameters. This is done for homogeneous and heterogeneous soils. The finite element model of soil-structure interaction provides a practical approach to show and to quantify; (1) the importance of the variability of the compressibility parameters, and (2) the heterogeneity soil behavior in the safety RC structures assessment. It also shows a significant impact of soil-structure interaction, especially with nonlinear soil behavior versus the time on the design rules of redundant RC structures. Doi: 10.28991/cej-2020-03091618 Full Text: PDF
Highlights
The process of monitoring Reinforced Concrete (RC) structures in service that includes inspections, specific measurements damages and evaluations of existing structures, is targeting the safety of the structure while begin in use
The verification of the settlement is an integral part of the process of the design of a shallow foundation of RC bridges, because it is well known that the settlement criteria is more critical than the bearing capacity in the design of shallow foundations
Before applying the design procedures at Serviceability Limit States (SLS) of RC bridges considering the creep behaviour of the over-consolidated soil, a test consists of simulating the contact between the soil and the foundation by elements of linear and nonlinear elastic support is done
Summary
The process of monitoring RC structures in service that includes inspections, specific measurements damages and evaluations of existing structures, is targeting the safety of the structure while begin in use. This implies that for a given stress state, a relationship that expresses the evolution of the deformation of the soil over time is needed This constraint on contact plays a more important role in the study of soil-structure interaction, especially in soft soils behavior. A new finite element model for soil-structure interaction is developed to calculate the consolidation settlement, and the bending moment in the foundation of an RC structure. This model is considering the influence of the long-term soil deformations of soft soils.
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