‘3() 6))1) *)2: )28%0)2+-2))+ ’32’6)8) ‘)7 %2(‘) 28%6= %’- 6))(&= %’- ‘)). %’- ‘SQQMXXII)RZMVSRQIRXEP. These procedures shall be used in accordance mental Engineering Concrete Structures and Commentary (ACI with Chapter 21 of ACI )” (ACI. ▫Introduced service durability factors to be applied to factored load effects. ▫ NRCS TR 67 – no change. ACI Concrete Protection for Reinforcement.
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International Concrete Abstracts Portal
Among the subjects covered are: Calculate the effective weight of the impulsive component of the stored liquid Wi, and the convective component Wc using Fig. The profile of the response spectrum is defined by Sa, which is a function of the period of vibration and the mapped accelerations SS and S1 3550-06 described in Section R9.
Select an importance factor I from Table 4. In this model, Wi represents the resultant effect of the impulsive seismic pressures on the tank walls. References to much of the research data referred to in preparing the code are given for those who wish to study certain requirements in greater detail.
The radial shear attains its maximum value at points on the tank wall oriented zero and degrees 35-006 the ground motion and should be determined using cylindrical shell theory and the tank dimensions.
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For a tank with a height-to-diameter ratio of 1: This standard includes the effects of vertical acceleration; and The user should note the following general design methods 5. They are subject to uniquely different loadings, more severe exposure conditions, and more restrictive serviceability requirements than non-environmental building structures.
Log In Sign Up. Shopbop Designer Fashion Brands. Acci circular tanks, calculate the hoop stresses due to the impulsive and convective pressures and due to the vertical acceleration Section 6. I’d like to read this book on Kindle Don’t have a Kindle?
Factor I provides a means for the engineer to increase the factor of safety for the categories of structures described in Table 4. The impulsive pressures are not impulses in the usual sense but are associated with inertia forces produced by accelerations of the walls of the container and are directly proportional to these accelerations. See and discover other items: AmazonGlobal Ship Orders Internationally.
The forces Pi and Pc act independently and simultaneously on the tank. For liquid- retaining structures, however, the methods in Chapter 9 of this standard should be used. Where the approved standard defines acceptance criteria in terms of allowable stresses as opposed to strengthsthe design seismic forces obtained from 350-60 appendix shall be reduced by a factor of 1. You just usually need to refer to the same section to see what is the stricter acci. In such a case, Eq. This standard includes an effective mass coefficient, used in this standard, which represent some of the key applicable to the mass of the walls.
Such structures are used for conveying, storing, or treating liquid or other materials such as solid waste.
ACI Seismic Design of Liquid-Containing | Roy Quesada –
In a pseudostatic analysis, the resultant of the seismic component of the earth pressure shall be assumed to act at a point 0. Committee activities include the development of building codes and specifications; analysis of research and development results; presentation of construction and repair techniques; and education.
The force Pc fluctuates sinusoidally with a period of vibration that sci on the adi of the tank, and can be several seconds or longer. The differences between the UBC and the IBC seismic provisions as used in this Standard are primarily due to differences in the definition of design ground motions and the construction of the corresponding design response spectra as explained below.
Lucero Risto Protic Patrick J. The design of the wall-footing interface should take the radial shear into account.
/R Code Requirements for Environmental Engineering Concrete Structures and Commentary
On the other hand, for many engineers who are familiar with ACIof course this similarity is helpful. They include ancillary structures for dams, spill-ways, and channels. ACI and its members disclaim liability for damages of any kind, including any special, indirect, incidental, or consequential damages, including without limitation, lost revenues or lost profits, which may result from the use of this publication.
Establish the design depth of the stored liquid HLthe wall height Hw, and the tank length or diameter, L or D, respectively; 2.
The roof-to-wall joint is subject to earthquake shear from the horizontal acceleration of the roof. Overturning moments—Compute overturning moments for the lateral loads described above using the procedures of Section 4.
The resistance side of the seismic design, including load combinations and strength reduction factors, may be computed in accordance with the applicable provisions of UBC ICBO or ACIChapter 9; and 2. B-4with Cv representing the effective site-specific qci ground acceleration expressed as a fraction of the acceleration due to gravity qci.
Showing of 1 reviews. Compute the vertical distribution of the force components in accordance with Chapter 5; Stresses: Skip to main content. In the model, Wi is rigidly fastened to the tank walls at a height hi above the tank bottom, which corresponds to the location of the resultant impulsive acii Pi.