Aci-350.3-06.pdf -

One of the most important concepts in ACI 350.3-06 is the division of the liquid‑induced seismic forces into two components: and convective (sloshing). This separation is based on the hydrodynamic model developed by G.W. Housner and later refined by researchers such as Veletsos and Shivakumar.

Rectangular tanks on grade must be checked for uplift and sliding. Circular tanks—often prestressed—require special anchorage design. The -06 edition provides load combinations specific to concrete tanks, which differ from ASCE 7 because they include the fluid self-weight as a variable load, not a dead load.

ACI 350.3 has evolved significantly over the years. The seismic design provisions of the previous (1989) edition of ACI 350 were very limited in scope—only five paragraphs in Section 2.9.4. The ACI Committee 350 decided to expand on Chapter 21 of ACI 318 to provide a set of thorough and comprehensive procedures for the seismic analysis and design of all types of liquid-containing environmental concrete structures.

Nevertheless, if your project permit was issued before 2015, the reviewing authority likely expects compliance with the -06 edition. Always check the adopted building code of your jurisdiction. ACI-350.3-06.pdf

ACI 350.3-06 applies to liquid-containing concrete structures that are subject to seismic forces, including:

ACI 350.3-06 represents a significant milestone in the seismic design of liquid-containing concrete structures. Before its development, engineers relied on fragmented guidance from building codes that weren't designed for tanks or on industry-specific standards that only covered certain tank types. ACI 350.3-06 unified the approach, covering —rectangular and circular, reinforced and prestressed—in a single, practical document. While superseded by the 2020 edition, the 2006 version laid the foundation for modern seismic design of environmental engineering structures and remains a valuable reference for legacy projects. For any engineer involved in designing water tanks, reservoirs, or any liquid-containing concrete structure in seismically active regions, ACI 350.3-06 (or its current version) is an indispensable resource.

This paper presents a step-by-step seismic analysis of a reinforced concrete rectangular water tank, following the provisions of ACI 350.3-06. The structure is located in Seismic Design Category D. Impulsive and convective (sloshing) components of hydrodynamic pressure are computed. Results are compared with general finite element modeling. The analysis demonstrates that ACI 350.3-06 provides a practical yet conservative method for determining seismic forces on tank walls and base shear. One of the most important concepts in ACI 350

Finite element model results: base shear = 428 kN (difference ~3.7%, within acceptable engineering margin).

ACI 350.3-06 provides critical requirements for the seismic design of liquid-containing concrete structures, focusing on unique fluid dynamics like impulsive and convective forces to ensure structural integrity and watertightness during earthquakes. It establishes essential guidelines for dynamic modeling, necessary freeboard for sloshing, and ensures the resilience of vital water infrastructure. For more technical details, you can find the full document and related updates at the American Concrete Institute (ACI) website.

ACI 350.3-06 is applicable to a wide range of reinforced concrete structures, including: Rectangular tanks on grade must be checked for

The document assumes that the structure is located in a seismic design category (SDC) B or higher, as defined by the International Building Code (IBC) or the American Society of Civil Engineers (ASCE) 7-10 standard.

ACI 350.3-06, "Seismic Design of Liquid-Containing Concrete Structures," provides essential procedures for calculating dynamic liquid forces on concrete containment structures during seismic events. It distinguishes between impulsive and convective (sloshing) forces, ensuring the structural integrity of environmental engineering infrastructure. You can review a related presentation of the standard on Scribd . Seismic Design for ACI 350.3-06 Structures | PDF - Scribd