Abstract As wastewater systems are reaching critical levels of aging and deterioration, simulation of realistic pipe behaviors is ever more needed to analyze and manage the associated risks. Developing such models is challenging, in part due to the complexity of aging and deterioration impacts on the structural and functional performance of pipes. This study investigates the impacts of a number of design and uncertain variables on the serviceability performance of concrete sewer pipes throughout their service life. This is facilitated by a high-fidelity three-dimensional Finite Element (FE) model of concrete sewer pipes, surrounding soil, and pavement layers in ANSYS platform. The FE model is capable of capturing nonlinear behaviors of concrete, soil, and pipe-soil interactions, in addition to simulating crack formation and crushing of concrete pipes. Corrosion impacts are simulated by sequentially removing concrete layers inside the pipe so that corrosion effects from previous years are taken into account. The influence of linear versus nonlinear assumptions for soil and pipe-soil interactions on the performance of the pipes especially crack width are investigated for cases where the models are subjected to external truckloads. Moreover, impacts of most common trench installations in terms of bedding, side-fill configuration, and soil properties are analyzed for the entire service life of the pipe. Results reveal that the soil surrounding the pipe needs to be modeled as a nonlinear material regardless of the soil grain size. It was observed that the error associated with modeling soil and soil-pipe interactions as linear increases as the pipe ages and the extent of corrosion increases. Results of this investigation can guide the development of reliable and computationally efficient numerical models for deteriorating underground concrete sewer pipes.

中文翻译：

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暴露于卡车装载和腐蚀恶化的埋地混凝土下水道的高保真计算研究

摘要 随着废水系统达到老化和恶化的临界水平，越来越需要模拟真实的管道行为来分析和管理相关风险。开发此类模型具有挑战性，部分原因是老化和劣化对管道结构和功能性能的影响的复杂性。本研究调查了许多设计和不确定变量对混凝土污水管在其整个使用寿命期间的适用性能的影响。ANSYS 平台中混凝土下水道、周围土壤和路面层的高保真三维有限元 (FE) 模型促进了这一点。有限元模型能够捕捉混凝土、土壤和管土相互作用的非线性行为，除了模拟混凝土管道的裂缝形成和破碎。通过依次去除管道内的混凝土层来模拟腐蚀影响，以便考虑前几年的腐蚀影响。在模型承受外部卡车载荷的情况下，研究了土壤和管道-土壤相互作用的线性与非线性假设对管道性能的影响，尤其是裂缝宽度。此外，在管道的整个使用寿命期间，分析了最常见的沟渠安装在垫层、边填结构和土壤特性方面的影响。结果表明，无论土壤颗粒大小如何，都需要将管道周围的土壤建模为非线性材料。据观察，随着管道老化和腐蚀程度的增加，与将土壤和土壤-管道相互作用建模为线性相关的误差会增加。这项调查的结果可以指导开发可靠且计算效率高的地下混凝土下水道恶化数值模型。