Performance design criteria for concrete liquid containing structures

混凝土含液结构(CLCS)被认为是生命线结构，其使用具有 在最近几十年里变得普遍起来。与液体储罐相关的问题涉及许多基本参数。液体储罐的动力行为受流体与结构物以及沿其边界的土壤与结构物之间的相互作用所支配。另一方面，结构柔性、储罐结构和流体特性是分析储罐性能的重要因素。研究发现，柔性容器中的动水压力可以显著高于相应的刚性容器。目前，加拿大的设计标准没有直接涉及这类结构的结构设计，这导致了这类设施的设计不一致。此外，与这些结构的设计有关的许多问题仍未解决。越来越多的人认识到生命线设施的重要性，特别是CLCS的重要性，并认识到有必要大幅改进这类设施的设计。为了满足裂缝和渗漏控制的标准，这种结构的仔细设计和细部设计是必要的。近年来，申请人对CLCS的行为进行了广泛的分析和实验研究。结果表明，目前的设计方法并不能反映这类结构的真实性能。此外，对于这一重要的广泛类别的结构，设计标准之间也存在很大的不一致。这主要是由于对这些结构在静力和地震荷载下的行为缺乏了解。拟议研究的主要目标是通过分析和实验程序，为钢筋混凝土储罐制定合理的设计程序，以确保安全的防渗漏结构。本课程将探讨含液体结构物的水密性概念。典型罐壁的节段将受到双向静力载荷。分析研究将基于非线性有限元方法。在本研究中，将考虑各种尺寸的矩形和圆形储罐。其目的是为代码决策提供必要的输入。

Concrete liquid containing structures (CLCS) are considered as lifeline structures in which their use have become widespread in recent decades. Problems associated with liquid tanks involve many fundamental parameters. The dynamic behaviour of liquid tanks is governed by the interaction between fluid and structure as well as soil and structure along their boundaries. On the other hand, structural flexibility, tank configuration, and fluid properties are the factors which are of great importance in analyzing the tank behaviour. It has been found that hydrodynamic pressure in a flexible tank can be significantly higher than the corresponding rigid container. Currently, Canadian design standards do not directly address the structural design of these types of structures and this has led to inconsistency in design of such facilities. Also, many issues related to design of these structures have remained unresolved. There is a growing recognition of the importance of lifeline facilities and in particular CLCS and the need for substantial improvements in the design of such facilities. Careful design and detailing of such structures is necessary to meet the criteria for crack and leakage control. In recent years, the applicant has carried out extensive analytical and experimental studies on the behaviour of CLCS. The results have indicated that the current design approach do not represent the true behaviour of these types of structures. Also, there is a great deal of inconsistency among the design standards for this important broad class of structures. This is mainly due to the lack of understanding of the behaviour of these structures under static and seismic loading. The main objective 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. The concepts to water-tightness in liquid containing structures will be investigated. Segments from typical tank walls will be subjected to bi-axial static loading. The analytical study will be based on non-linear finite element method. Both rectangular and circular tanks of various dimensions will be considered in this study. It is intended to provide the necessary input for code decision making.