Towards a Rational Design Procedure for Concrete Liquid Containing Structures

走向混凝土含液结构的合理设计程序

• 批准号: RGPIN-2022-03823
• 负责人: kianoush, Reza
• 金额: $ 1.89万
• 依托单位: Ryerson University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=749370
• 关键词: Towards; Rational; Design; Procedure; Concrete

Liquid containing structures (LCS) as part of environmental engineering facilities are primarily used for water and sewage treatment plants and other industrial wastes. In Canada, they are normally constructed of reinforced concrete in the form of rectangular or circular configurations. These structures are considered as lifeline facilities that require careful design and detailing to meet serviceability requirements for crack and leakage control. There are currently few guidelines and standards available in North America for the design of LCS. Only recently, the Canadian Standards Association (CSA) has developed a Standards for the design of Wastewater Treatment Plants which is due to be published very soon. The American Concrete Institute (ACI Committee 350) has developed a code and commentary for concrete LCS. There is a great deal of inconsistency among different design guidelines and standards for this important broad class of structures. This is mainly due to the lack of understanding of the seismic behavior of these structures. In recent years, the applicant has carried out extensive analytical investigations on the behavior of concrete LCS. The results have indicated that the current design codes and standards do not represent the actual behavior of these types of structures. The main issues of concern are the relationship between the crack width and leakage for members subjected to flexure and/or direct tension, effects of temperature and shrinkage due to restraints on cracking in concrete slabs and walls as well as those issues related to seismic loading. One important issue is related to the response modification factor, R, used for determining the equivalent base shear because of earthquakes. As a result, full scale experiments are planned to be performed on wall-slab connections. A steel water pressure chamber will be installed at the connection of the wall-foundation to simulate the liquid-tank interaction and to enable the detection of possible leakage within the critical regions of the tank wall. Based on the above discussion, the main objectives of the proposed research study is to develop a rational design procedure, through analytical and experimental programs, for reinforced concrete tanks that assures a safe leak resistant structure. In the experimental program, specimens while under loads which include hydrostatic, and dynamic will be simultaneously subjected to liquid pressure and leakage tests. Based on the results of this study, a performance criterion based on serviceability requirements and the level of protection will be used to establish the R values. This project also includes analytical studies which will be based on non-linear finite element method. Also, analytical investigations on the seismic behavior of concrete elevated water tanks using the finite element method will be performed in this study. It is intended to provide the necessary input for code decision making.

作为环境工程设施的一部分，含有结构的液体（LC）主要用于水和污水处理厂以及其他工业废物。在加拿大，它们通常是由矩形或圆形构型形式的钢筋混凝土构造的。这些结构被认为是生命线设施，需要仔细设计和细节以满足破解和泄漏控制的可使用性要求。目前，北美几乎没有针对LCS设计的准则和标准。直到最近，加拿大标准协会（CSA）才制定了一项废水处理厂设计标准，该标准即将出版。美国混凝土研究所（ACI委员会350）已为混凝土LCS制定了守则和评论。在这种重要的广泛结构中，不同的设计指南和标准之间存在很大的不一致。这主要是由于缺乏对这些结构的地震行为的理解。 近年来，申请人对混凝土LC的行为进行了广泛的分析研究。结果表明，当前的设计代码和标准并不代表这些类型的结构的实际行为。关注的主要问题是裂纹宽度与弯曲和/或直接张力的成员的泄漏之间的关系，由于约束对混凝土板和墙壁开裂而引起的温度和收缩的影响以及与地震载荷有关的问题。一个重要的问题是与响应修饰因子R有关，用于确定由于地震而确定等效的基本剪切。结果，计划在壁板连接上进行全尺度实验。将在墙壁配置的连接处安装钢水压室，以模拟液体坦克的相互作用，并能够检测到储罐壁的关键区域内可能的泄漏。基于上述讨论，拟议的研究研究的主要目标是通过分析和实验计划制定合理的设计程序，以确保耐安全泄漏结构的钢筋混凝土储罐。在实验程序中，在包括静液压和动态的载荷下，标本将同时进行液压和泄漏测试。基于本研究的结果，将使用基于可维修性要求的性能标准和保护水平来建立R值。该项目还包括基于非线性有限元方法的分析研究。同样，在本研究中将对使用有限元方法进行混凝土升高水箱的地震行为进行分析研究。它旨在为代码决策提供必要的输入。