Limit states behaviour and modeling of deep corrugated steel box culverts

深波纹钢箱涵的极限状态行为与建模

• 批准号: 350003-2006
• 负责人: Moore, Ian
• 金额: $ 1.48万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2008
• 资助国家: 加拿大
• 起止时间: 2008-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=401970
• 关键词: Limit; states; behaviour; modeling; deep

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.

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，在加拿大制造的深波纹金属箱涵是一种重要的涵洞类型，尚未包括在迄今为止进行的计算机建模研究中，这些研究构成了当前加拿大和美国涵洞设计实践的基础。