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Development of Methodology for Generating Response Spectra for Decoupled Smallbore Piping

Bondesson, Karl (2014) In TVSM-5000 VSM820 20141
Structural Mechanics
Department of Construction Sciences
Abstract
In nuclear piping engineering, the response spectrum method of analysis is widely used to analyze piping systems. The matter of combining modal responses is of great interest.

Complications may occur with the response spectrum method for large systems. Examples are convergence issues and something called twin-mode effects that may overestimate the effects on the system. This master thesis investigates the possibility of separating small parts of piping systems, thus reducing the original system in size, and analyzing the separated systems independently by loading them with a modified response spectrum based around a dynamic amplification factor. The process of calculating the modified response spectrum is automated by the development of... (More)
In nuclear piping engineering, the response spectrum method of analysis is widely used to analyze piping systems. The matter of combining modal responses is of great interest.

Complications may occur with the response spectrum method for large systems. Examples are convergence issues and something called twin-mode effects that may overestimate the effects on the system. This master thesis investigates the possibility of separating small parts of piping systems, thus reducing the original system in size, and analyzing the separated systems independently by loading them with a modified response spectrum based around a dynamic amplification factor. The process of calculating the modified response spectrum is automated by the development of an application using Python.

The modeling of the piping systems is done in Pipestress, which is a commonly used computer software for design of pipes at nuclear power plants. Different modal combination methods and certain modeling issues are investigated and finally the stress in the original and the separated system is calculated and compared.

There is no experimental data to compare the results to, but the method of separating systems with a modified response spectrum shows some promise, even though further investigation is needed. (Less)
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author
Bondesson, Karl
supervisor
organization
course
VSM820 20141
year
type
H3 - Professional qualifications (4 Years - )
subject
publication/series
TVSM-5000
report number
TVSM-5201
ISSN
0281-6679
language
English
id
8893859
alternative location
http://www.byggmek.lth.se/english/publications/tvsm-5000-masters-dissertations/
date added to LUP
2016-10-21 15:20:08
date last changed
2016-10-21 15:20:08
@misc{8893859,
  abstract     = {In nuclear piping engineering, the response spectrum method of analysis is widely used to analyze piping systems. The matter of combining modal responses is of great interest.

Complications may occur with the response spectrum method for large systems. Examples are convergence issues and something called twin-mode effects that may overestimate the effects on the system. This master thesis investigates the possibility of separating small parts of piping systems, thus reducing the original system in size, and analyzing the separated systems independently by loading them with a modified response spectrum based around a dynamic amplification factor. The process of calculating the modified response spectrum is automated by the development of an application using Python.

The modeling of the piping systems is done in Pipestress, which is a commonly used computer software for design of pipes at nuclear power plants. Different modal combination methods and certain modeling issues are investigated and finally the stress in the original and the separated system is calculated and compared.

There is no experimental data to compare the results to, but the method of separating systems with a modified response spectrum shows some promise, even though further investigation is needed.},
  author       = {Bondesson, Karl},
  issn         = {0281-6679},
  language     = {eng},
  note         = {Student Paper},
  series       = {TVSM-5000},
  title        = {Development of Methodology for Generating Response Spectra for Decoupled Smallbore Piping},
  year         = {2014},
}