A Load Combination Method for Seismic Design of Multi-Degree-of-Freedom Piping Systems With Friction Characteristics and Multiple Support Systems

2014 ◽  
Author(s):  
Akira Sone ◽  
Tatsuya Yamauchi ◽  
Arata Masuda
Keyword(s):  
Degree Of Freedom ◽  
Combination Method ◽  
Piping System ◽  
Theory Approach ◽  
Maximum Acceleration ◽  
Friction Characteristics ◽  
Load Combination ◽  
Combination Scheme ◽  
Piping Systems ◽  
Multiple Support

A load combination scheme for seismic response calculation of multi-degree-of-freedom (MDOF) piping systems with friction characteristics to multiple support excitations is presented. This scheme has an advantage, such that the “response reduction factor” due to friction is taken into account by use of a stationary random vibration theory approach. Using a simple and analytical 5DOF piping system with friction characteristics to two support excitations, combination law is supplied to various friction characteristics and the maximum responses of piping is calculated. From these calculation results, it is clear that the maximum acceleration responses of piping systems calculated by the proposed scheme are reasonable compared with those by the numerical simulations.

A Load Combination Method for Seismic Design of Multiple Supported Piping Systems With Friction Characteristics: Part 1—Generally Correlated Excitations

2011 ◽  
Author(s):  
Tatsuya Yamauchi ◽  
Kazumasa Tsuchikawa ◽  
Arata Masuda ◽  
Akira Sone
Keyword(s):  
Cross Correlation ◽  
Reduction Factor ◽  
Combination Method ◽  
Piping System ◽  
Theory Approach ◽  
Friction Characteristics ◽  
Response Reduction Factor ◽  
Load Combination ◽  
Piping Systems ◽  
The Cross

A load combination method for seismic response calculation of piping systems with friction characteristics to multiple support excitations is presented. This method has an advantage, such that the cross-correlation among support excitations and “response reduction factor” due to friction are taken into account by use of a stationary random vibration theory approach. Using a simple analytical SDOF piping system with friction characteristics to two support excitations, This method is supplied to various correlation cases of two support excitations and friction characteristics and the maximum responses of piping is calculated. From these calculation results, it is clear that the maximum acceleration responses of nonlinear piping systems can also depend on the cross-correlation among support excitations and can be reduced due to the friction effect. Finally, the conventional equation of the response reduction factor and the maximum response calculated by the proposed method are presented for practical use.

A Load Combination Method for Seismic Design of Multiple Supported Piping Systems With Friction Characteristics: Part 2—Correlated Excitations Considering Characteristics of Supports

2011 ◽  
Author(s):  
Tatsuya Yamauchi ◽  
Kazumasa Tsuchikawa ◽  
Atsushi Yokota ◽  
Arata Masuda ◽  
Akira Sone
Keyword(s):  
Reduction Factor ◽  
Combination Method ◽  
Response Analysis ◽  
Piping System ◽  
Theory Approach ◽  
Maximum Acceleration ◽  
Friction Characteristics ◽  
Response Reduction Factor ◽  
Piping Systems ◽  
Calculation Results

Seismic response analysis of piping systems with friction characteristics to multiple support excitations is presented. By this analysis, the maximum responses of piping system are calculated and “response reduction factor” due to friction are taken into account by use of a stationary random vibration theory approach. Using a simple analytical SDOF piping system with friction characteristics to two support excitations, This method is supplied to various support cases with two support excitations and friction characteristics and the maximum responses of piping is calculated. From these calculation results, it is clear that the maximum acceleration responses of nonlinear piping systems can be reduced due to the friction effect. Finally, the conventional equation of the response reduction factor and the maximum response calculated by the proposed method are presented for practical use.

A Load Combination Method for Aseismic Design of Multiple Supported Piping Systems

1989 ◽  
Vol 111 (1) ◽  
pp. 10-16 ◽  
Author(s):  
K. Suzuki ◽  
A. Sone
Keyword(s):  
Structural Model ◽  
Response Spectrum ◽  
Reduction Factor ◽  
Combination Method ◽  
Piping System ◽  
Response Reduction Factor ◽  
Load Combination ◽  
Combination Scheme ◽  
Piping Systems ◽  
Reduction Effect

A new load combination scheme for seismic response calculation of piping systems subjected to multiple support excitations is presented. This scheme has an advantage, such that the cross-correlation among support excitations are properly taken into account by use of a stationary random vibration approach. The authors also present the idea of generating a “multi-excitation floor response spectrum.” First, using a simple analytical SDOF piping system to two support excitations and a simple Z-shaped piping model for shaking test, the combination law is supplied to various correlation cases of two support excitations and the maximum responses of piping in a fundamental mode is calculated. Second, nonlinear characteristics such as gap and friction appearing between piping itself and supports are specifically investigated. The response effect due to these nonlinearities is evaluated by the results through the shaking test with a piping-support structural model, and the amount of response reduction effect is represented by “a response reduction factor β.”

Seismic Response Analysis of Multiple Supported Piping System Considering Friction Characteristics of Support

2011 ◽  
Author(s):  
Akira Sone ◽  
Kazumasa Tsuchikawa ◽  
Tatsuya Yamauchi ◽  
Arata Masuda
Keyword(s):  
Practical Method ◽  
Reduction Factor ◽  
Maximum Response ◽  
Response Analysis ◽  
Piping System ◽  
Petrochemical Plant ◽  
Maximum Acceleration ◽  
Friction Characteristics ◽  
Response Reduction Factor ◽  
Piping Systems

In this study, a practical method for obtaining the nonlinear seismic maximum response properties of multiple supported piping systems with friction characteristics in industrial plants such as the nuclear power plant and petrochemical plant is presented. In this method, the response reduction effects of friction are effectively considered. The method also facilitates the calculation of maximum nonlinear responses by using those of the linear piping-supporting system. By numerical simulations with a simple 2DOF model, the reduction effect of friction on the maximum acceleration responses of multiple supported piping systems are evaluated in terms of “response reduction factor”. After summarizing the characteristics of the response reduction factor obtained for various system parameters, a practical method for obtained this factor using the maximum linear response of piping system can be introduced. Finally, the maximum response calculated by the proposed method is presented for practical use.

A Test and Analysis of the Multiple Support Piping Systems

1989 ◽  
Vol 111 (3) ◽  
pp. 291-299 ◽  
Author(s):  
T. Chiba ◽  
R. Koyanagi ◽  
N. Ogawa ◽  
C. Minowa
Keyword(s):  
Large Scale ◽  
Response Spectrum ◽  
Steel Structures ◽  
Response Spectra ◽  
Piping System ◽  
Multiple Response ◽  
Actual Behavior ◽  
Test Results ◽  
Piping Systems ◽  
Multiple Support

One of the current topics in the seismic design of piping systems is the overall reliability of them in earthquake events. Actual piping systems are generally supported by independent structures such as vessels and steel structures. So, it is very important to clarify the behavior of actual piping systems during the seismic events. For this purpose, the analytical method of multiple excitation problems is a preferable approach to not only evaluate the actual behavior of the piping systems, but also improve the reliability of piping systems. To clarify the dynamic characteristics of the piping systems and to assess the computational methods in the linear system subjected to multiple support excitations, an experimental study using a realistic large-scale piping model has been conducted. The equations for the multiple excitation problem have been validated and the adequacy of the multiple response spectra method has been confirmed by the comparison of the test results with the analytical one. This paper reports the results focusing on the analytical methods of the multiple support piping system. It is noted that the multiple response spectrum method is efficient for the multiple excitation problems.

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