Buy ASME STS Steel Stacks from SAI Global. ASME STS-1– (Revision of ASME STS-1–). Steel Stacks. AN AMERICAN NATIONAL STANDARD. Three Park Avenue • New York, NY Revision: Edition, ; Published Date: January ; Status: Active, Most Current; Document Language: English; Published By: ASME International.
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Are you an Engineering professional? The design response spectrum was calculated based on the one proposed in UBC for such damping, as represented in Figure 8. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Finally, the response spectrum analysis results based on the first 7 modes and on an SRSS combination are presented in Table 16, and colour maps of the stresses are shown in Figures 9 sts-1-0211 10 for the two chimney conditions, NTNC and TC, considering independently combinations of the seismic forces along X and Y directions with forces along direction Z.
Finally, it is noticed that the Scruton number Sc, defined as. Thank you for helping keep Eng-Tips Forums free from inappropriate posts. Close this window and log in.
ASME STS Steel Stacks – Google Books
Design loads and the methodology of analysis were defined according to the ASCE code. However, for the purpose of comparison, the loads determined according to the static force procedure have been calculated and are summarised in Table 13 considering the first two modes in each direction.
Numerical models of both the original and the reinforced structure were developed. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.
Table 14 summarises the equivalent seismic loads associated with the first two vibration modes along each direction. Having this aspect into consideration, static equivalent forces were calculated according to defined in the ASME-STS code, in order to check the amplitudes of vibration and stresses. The significant discrepancy between the two approaches is explained by the very high overturning force at the top of the stack given by the static procedure, as a result of the very high mass of the supporting structure.
For the other horizontal direction this TMD is not required as the vortex shedding critical velocity Students Click Here Join Us! These simplifications allowed for easier result handling and maintained intact the principal horizontal actions resistant structural schemes. The results of a complementary verification of the sensitivity of the chimney to vortex shedding are summarised in Table 8, following the methodology proposed in the ASME STS specification.
The Architecture, Engineering and Construction AEC industry is constantly looking for process improvements to better manage potential project delays and costs.
Design of stacks Aliaga: The seismic response was then calculated for the un-corroded ste-1-2011 at normal temperature and the heated corroded chimney.
A comparison between the base shear and bending moments calculated on the basis of the static procedure and of the response spectrum analysis is presented in Table 15, considering a response factor R of 2. By joining you are opting in to receive e-mail. The very high calculated amplitudes of vibration and stresses motivated the option to implement a tuned mass damper TMD tuned to the direction Y most flexible direction.
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Design of stacks
The stack design was based on the following codes: These forces and moments were in both cases calculated by combination of the forces in correspondence with the two mode contributions along each direction using the square root of the sum of squares SRSS. I don’t have that standard. Such issues are the result of project complexity, size, uniqueness and regulation, as well as the need for virtual team collaboration.
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Design of stacks – Modalyse
It’s easy to join and it’s free. Detailed colour maps of stresses in the lower part of the stack for the heated and corroded condition are further represented sts–12011 Figure 11 to illustrate the small amplitudes observed adme that part of the chimney.
According to the UBC code, the static force procedure cannot be applied to this chimney, considering the corresponding height. The Eng-Tips staff will check this out and take appropriate action. Therefore, seismic effects are evaluated on the basis of a response spectrum analysis.
Join your peers on the Internet’s largest technical engineering professional community. As expected, the response spectrum method leads to a lower response than the static procedure. Design response spectrum according to UBC and parameters from Table But the “12” factor suggests that maybe d is supposed to be in inches rather than sts-1-20111
Given the fundamental frequencies of the chimney, this structure is assumed as rigid for the purpose of wind assessment and therefore a static analysis was conducted based on the application of equivalent static loads. Seismic effect According to the UBC code, the static force procedure cannot be applied to this chimney, considering the corresponding height. Red Flag This Post Please let us know here why this post is inappropriate. Click Here to join Eng-Tips and talk with other members! Table 4 systematises structural data, namely dimensions, mass and damping ratio defined according to the ASME STS specificationforce coefficients and importance factor.
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