Numerical Analysis of Corrugated Steel Pipes Rehabilitated Using Cementitious Liner**

波纹钢管广泛应用于涵洞工程。磨损和腐蚀现在是CSP劣化的常见原因。由于其易于使用和成本低，水泥喷射衬里被用于修复CSP涵洞的结构强度和水力性能。然而，修复CSP的性能还没有得到充分的研究，现有的标准缺乏设计指南，包括喷涂衬里。此外，这些标准未能适当考虑超载/车辆荷载，而超载/车辆荷载可能是修复管道系统的大部分需求的来源。研究人员已经使用全尺寸测试来研究内衬有喷涂水泥内衬的圆形钢管的性能，并且已经提出了用于选择足以确保圆形CSP内的喷涂内衬的足够强度的内衬厚度的设计方法。然而，建议的设计方法尚未扩展到包括非循环污水管。因此，拟议的研究的主要目标将是进行建模/分析恶化CSP的各种几何形状的非圆形截面在不同的负载和现场条件下，以分析管道和内衬的性能和响应。通过对失效管道和修复管道的分析，揭示了喷涂内衬如何有助于提高CSP的承载能力和使用载荷响应。根据研究结果，将提出一个设计程序，用于修复非圆形管道使用水泥喷涂衬里。拟议的研究将建立喷涂内衬的设计指南和所需内衬厚度的计算，并更好地了解这种修复技术如何提高管道强度和预期寿命。这些进步代表了合作伙伴公司的巨大竞争优势，因此他们可以为客户提供更具成本效益的康复选择。与传统的管道更换相比，市政和省级基础设施业主可以节省30%至60%的修复成本，每年在加拿大节省数百万美元。

Corrugated steel pipes (CSPs) are widely used to construct culverts. Abrasion and corrosion are now common causes of CSP deterioration. Owing to its ease of use and low cost, cementitious spray lining is being employed to rehabilitate CSP culverts in terms of both structural strength and hydraulic performance. However, the performance of rehabilitated CSP has not been adequately studied and existing standards lack design guidelines encompassing spray lining. Moreover, these standards fail to properly account for overburden/vehicle loads which can be the source of most of the demand on the rehabilitated pipe system. Researchers have used full scale testing to investigate the performance of circular steel pipes lined with sprayed cementitious liners, and have proposed design methods for selecting the liner thickness sufficient to ensure adequate strength of the sprayed liner within a circular CSP. However, the proposed design methods have not yet been extended to include non-circular sewers. Hence, the main goal of the proposed research would be to conduct modeling/analysis of deteriorated CSP of various geometries with non-circular cross-sections under different loading and field conditions in order to analyze pipe and liner performance and response. The analysis of both deteriorated and rehabilitated pipes can reveal how the sprayed liner will contribute to enhancing the load bearing capacity and service load response of the CSP. Based on the findings, a design procedure for rehabilitation of non-circular pipes using cementitious spray lining will be proposed. The proposed research will establish design guidelines for spray-on liners and the calculations for required liner thickness, and better understanding of how this rehabilitation technique improves pipe strength and life expectancy. These advances represents a substantial competitive advantage for the partner company, so they can offer their clients more cost-effective rehabilitation options. Municipal and provincial infrastructure owners can save from 30% to 60% of rehabilitation costs compared to conventional pipe replacement, saving millions of dollars on an annual basis across Canada.****