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

波纹钢管广泛应用于涵洞的施工。磨损和腐蚀现在是CSP恶化的常见原因。水泥喷射衬砌由于使用方便、造价低，目前正被用于CSP涵洞的结构强度和水力性能的修复。然而，修复后的CSP的性能还没有得到充分的研究，现有的标准缺乏包括喷塑衬里的设计指南。此外，这些标准没有适当地考虑到覆盖/车辆负荷，这可能是修复后的管道系统的大部分需求的来源。研究人员利用全尺寸试验研究了涂有水泥基衬里的圆形钢管的性能，并提出了选择衬里厚度的设计方法，以确保圆形CSP内喷涂衬里的足够强度。不过，建议的设计方法尚未扩展至包括非圆形污水渠。因此，拟议研究的主要目标将是在不同的载荷和现场条件下对不同几何形状的非圆形截面劣化CSP进行建模/分析，以分析管道和衬砌的性能和响应。对破损和修复后的管道进行分析，可以揭示喷涂衬里将如何有助于提高CSP的承载能力和使用荷载响应。在此基础上，提出了非圆管水泥基喷衬加固的设计方法。拟议的研究将建立喷涂衬里的设计指南和所需衬里厚度的计算，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。这些进步对合作伙伴公司来说是一个实质性的竞争优势，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所有者可以节省30%到60%的修复成本，整个加拿大每年节省数百万美元。*

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.****