Field research study of three-sided precast structures

三面预制结构现场调查研究

• 批准号: 537539-2018
• 负责人: ElNaggar, Hesham
• 金额: $ 2.1万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=699314
• 关键词: Field; research; study; three; sided

Culverts are used to convey water, utilities, or pedestrians through embankments and they are considered as a strategic part of the urban infrastructure for all societies. Three-sided culverts are gaining popularity as an alternative to box culverts owing to their advantages, including: quick installation; ease of construction; reduced cost compared to box culverts; and minimal impact on the aquatic environment. They are currently designed in accordance with common practice of reinforced concrete with assumed earth pressure distribution as box culverts, which leads to an overly conservative design. Therefore, this research aims to: understand the behavior of three sided culverts and the factors that affect their behavior, establish their actual loading conditions and develop special guidelines for their design based on full scale field measurements. Many factors are expected to influence the interaction of precast concrete three-sided structures with the surrounding soil, such as: culvert shape, structure stiffness, embedment depth, and foundation rigidity. These factors will affect the applied earth loads (vertical and lateral) as well as thrusts, shear forces and bending moments applied to the structural elements and consequently their design. It is expected the research will establish a robust, yet simplified design method for three sided culverts and examine the applicability and limitations of the current standard of practice design methods of three sided culverts.The findings from this research will result in reliable and cost effective design of three-sided culverts.The precast concrete products used in transportation in the USA amount to $2.0B (Freedonia Group, 2018) with the Canadian market is approximately $200M.

涵洞用于通过涵洞输送水、公用设施或行人， 被视为所有社会城市基础设施的战略组成部分。三面涵洞作为箱形涵洞的替代方案越来越受欢迎，因为它们具有以下优点：安装快速;易于施工;与箱形涵洞相比成本降低;对水生环境的影响最小。目前，它们是按照钢筋混凝土的惯例设计的，假定土压力分布为箱涵，这导致设计过于保守。因此，本研究旨在：了解三边涵洞的行为和影响其行为的因素，建立其实际荷载条件，并根据全尺寸现场测量制定其设计的特殊指南。许多因素预计会影响预制混凝土三面结构与周围土壤的相互作用，如：涵洞形状，结构刚度，埋深，和基础刚度。这些因素将影响所施加的土荷载（垂直和横向）以及施加到结构元件上的推力、剪切力和弯矩，从而影响其设计。本研究将建立一个可靠的、简化的三边涵洞设计方法，并检验现行三边涵洞实用设计方法标准的适用性和局限性。本研究的结果将产生可靠的、具有成本效益的三边涵洞设计。在美国，用于运输的预制混凝土产品价值20亿美元（Freedonia Group，2018）与加拿大市场的交易额约为2亿美元。