Limit states behaviour and modeling of deep corrugated steel box culverts

金属涵洞结构的强度和刚度取决于金属和土壤成分的复合特性。虽然已经进行了大量的工作，以了解在正常工作负载（地球和车辆负载预期在服务）的负载分配的性质，很少有人知道在LOAC水平接近崩溃的行为，如何不同的组成部分的复合系统达到其强度极限，以及如何重新分配负载从组件在危难中的其他仍然有储备能力。由于不可能进行使这些结构失效的实验，因此不可能观察到这种非线性响应并在计算机上自信地对其进行建模。因此，目前的金属涵洞强度理论假设，倒塌时构件之间的荷载分担与使用荷载时的荷载分担相同。此外，加拿大制造的深波纹金属箱涵是一种重要的涵洞类型，迄今为止尚未包括在计算机建模研究中，该研究构成了当前加拿大和美国涵洞设计实践的基础。使用皇后区的新设施进行大规模实验室实验，这将允许观察涵洞坍塌前的非线性行为（包括荷载重新分布）; B.深入研究波纹金属箱涵，为其开发计算机模型，并使用这些新的计算机模型来探索一系列涵洞几何形状和掩埋条件;以及c.为加拿大和美国涵洞设计标准中使用的金属箱形涵洞开发简化分析模型。2试验的计算机模拟将包括线性和非线性、二维和三维分析。这些模型将允许对传统的掩埋条件进行计算机研究，也将用于研究金属箱涵对异常荷载条件的耐受性（例如，与不良施工实践有关）。该项目将培养一名硕士生和一名博士生。

The strength and stiffness of metal culvert structures depends on the composite behaviour of both the metal and soil components. While considerable work has been performed to understand the nature of load-sharing at normal operating loads (the earth and vehicle loads expected in service), little is known about behaviour at loac levels approaching collapse, how the different components of the composite system reach their strength limits, and how loads are redistributed from components in distress to others that still have reserve capacity. Since it has not been possible to conduct experiments that bring these structures to failure, it has not been possible to observe this nonlinear response and model it confidently on the computer. Current theories of metal culvert strength therefore assume that load sharing between the components at collapse is identical to load sharing at service loads. Furthermore, deeply corrugated metal box culverts manufactured in Canada are an important culvert type that has not been included in the computer modeling studies performed to date, which form the basis of current Canadian and US culvert design practice.The objectives of the project are to: a. conduct large scale laboratory experiments using a new facility at Queen's, which will permit observations of nonlinear behaviour (including load redistribution) up to culvert collapse; b. study deeply corrugated metal box culverts, develop computer models for them, and use those new computer models to explore a range of culvert geometries and burial conditions; and c. develop simplified analysis models for metal box culverts for use in Canadian and US culvert design standards.Computer modeling of the experiments will include linear and nonlinear, two dimensional and three dimensional analyses. The models will permit computer studies of conventional burial conditions, and will also be used to study the tolerance of metal box culverts to unusual loading conditions (associated with poor construction practice, for example). The project will train one MSc student and one PhD student.