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The Architecture, Engineering and Construction AEC industry is constantly looking for process improvements to better manage potential project delays and costs. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Design response spectrum according to UBC and parameters from Table Register now while it’s still free! Close this window and log in. Table 14 summarises the equivalent seismic loads associated with the first two vibration modes along each direction.
These simplifications allowed for easier result handling and maintained intact the principal horizontal actions resistant structural schemes. As expected, the response spectrum method leads to a lower response than the static procedure.
Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. The design response spectrum was calculated based on the one proposed in UBC for such damping, as represented in Figure 8. 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 and 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.
Students Click Here Join Us! Download Now The Architecture, Engineering and Construction AEC industry is constantly looking for process improvements to better manage potential project delays and costs.
Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. 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. For the stts-1-2011 horizontal direction this TMD is not required as the vortex shedding critical velocity It’s easy to join and it’s free.
The seismic response was then calculated for the un-corroded chimney at normal temperature and the heated corroded chimney. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
ASME STS Steel Stacks – Google Books
Therefore, seismic sts-11-2011 are evaluated on the basis of a response spectrum analysis. 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. 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.
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Design of stacks
Are you an Engineering professional? 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. Join your peers on the Internet’s largest technical engineering professional community.
Few production environments have the luxury of ordering new equipment to replace existing machines on their shop floor. Table 4 systematises structural data, namely dimensions, mass and damping ratio defined according to the ASME STS specificationforce coefficients and importance factor.
Detailed colour maps of stresses in the lower part of the stack for the heated and corroded condition are further represented in Figure 11 to illustrate the small amplitudes observed in that part of the 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. Finally, it is as,e that the Scruton number Sc, defined as. I don’t have that standard. Design of stacks Aliaga: Resources Few production environments have the luxury of ordering new equipment to replace existing machines on their shop floor.
Red Flag This Post Please let us know here why this post is inappropriate. 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.
Given the fundamental frequencies sys-1-2011 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.
But the “12” factor suggests that maybe d is supposed to be in inches rather than feet?
ASME STS -1 QUESTION – Structural engineering other technical topics – Eng-Tips
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. 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.
Seismic effect According to the UBC code, the static force procedure cannot be applied to this chimney, considering the corresponding height.
Design sts–2011 and the methodology of analysis were defined according to the ASCE code. Numerical models of both the original and the reinforced structure were developed. The stack design was based on the following codes: