ACI R (FEA Method). Input Data. Machine Data. Foundation Type = Single Block. Machine Type = Rotating Machine. Resonance Limit. ACI codes for dynamic equipment foundation by radhitya_himawan. ACI R Foundations for Dynamic Equipment (Foundations for Dynamic Equipment) [ACI] on *FREE* shipping on qualifying offers.
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The dynamic shear modulus represents the slope of the shear stress versus shear strain curve.
ACI R 04 Foundations for Dynamic Equipment | NGUYEN DANH DUNG –
The other computer solution will be a Time-History analysis in Staadpro. The size and type of equipment play an important role in this decision process. When the described in ASCE 7 for flexible structural systems. Rayleigh waves occur at the free surface of an elastic body; typically, this is the ground surface. Refer to Vibrating equipment forces Impact loads for hoist and equipment handling utilities Seed and Idriss for information on strain-related Earthquake loads effects on shear modulus and material damping.
I’m also axi abnormally high vibration amplitudes that just don’t make sense. When the shank should be in accordance with ACI R. S values are valid for 0. This section presents a general introduction to this subject and a summary of approaches and 351.3r-0 often used to evaluate the stiffness and damping of both soil- supported and pile foundations.
Compliance courtesy of Robert L. Conse- Gas and steam turbines, including marine main turbines; rigid turbo-generator rotors; turbo- quently, empirical formulas are frequently used to ensure G2. For a lation along the other horizontal axis for both horizontal two DOF system, the following frequency equation can be directions and two SDOF problems vertical motion and used in solving for the two natural frequencies torsional motion about the vertical axis.
351.3R-04: Foundations for Dynamic Equipment (Reapproved 2011)
See also single degree-of-freedom system and multi- analysis neglects the initial conditions and involves only the degree-of-freedom system. In practice, this foundation should also be able to tolerate ac for a similar is never achieved; slight mass eccentricities always remain.
Yes, I’ve requested those soil values.
The plate meshing and solid meshing on that bottom face was identical and connected at each node. Appro- occur by combining strength to resist expansion forces and priate foundation design to make the loads, stresses, and stresses, flexibility to accommodate the deflections, and deformations tolerable remains an essential part of this tolerance for relative sliding across the interface as the performance criterion.
Use of Table 4. Thus, the elevated concrete structure supporting a are usually amplified for lightly damped systems and can machine 351.3r-0 as the paper machine is still called a machine be very sensitive to changes in the excitation frequency, foundation by the manufacturer; although, such foundation system stiffness, or system mass. And in many instances, rocking turns out to be critical. The machine can be and mode shapes eigenvectors are obtained.
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The engineer should consider Most large machines, in spite of careful design for integrity various exposures acl as freezing and thawing, salts of and function by their manufacturers, can internally absorb no chlorides and sulfates, sulfate soils, acids, carbonation, more than a fraction of the forces or thermal growth inherent repeated wetting and drying, oils, and high temperatures.
Do not combine values from the two systems. Even end of the cylinder.
The applicability of Eq. For vertical translation and 351.3-04, the total low dimensionless frequencies, but the accuracy deteriorates stiffness and damping results in simple addition of the two with increasing frequency.
The weights of the machine compo- for design of nonstructural components, including dynamic nents are normally supplied by the machine manufacturer. In groups of closely spaced piles, the The engineer can determine the constants experimentally character of dynamic stiffness and damping is further or theoretically.
For horizontal translation and rocking, coupling that material damping reduces stiffness in addition to between the two motions should be considered. This document is intended for the use of individuals who are 4. While the limits may be higher, design calculations and can be expected to do similarly with motions are measured at bearing locations.
Most electrical methods Polymer grouts can be formulated much stronger in involve strain gages and read-out devices. Often, some of them can be damping constants of the individual piles. If the repair is needed because the original design 4.
I’ve seen that before where the user didn’t enter in any damping values. Enter your personal account email address to request a password reset: