Methods of implementing PVRC proposed piping damping for structural computer codes

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5730345

Ware, A G; Gorman, V W; Arendts, J G

A task group of the Pressure Vessel Research Committee of the Welding Research Council has recommended that structural damping for seismic analyses of piping systems be modified from the present constant damping to allow higher damping values at low response frequencies. This paper evaluates the implementation of this proposed change, which makes damping frequency dependent, on typical structural computer codes. For response spectrum analyses and time-history modal superposition analyses, the most commonly used seismic techniques, the proposed changes can be easily carried out and only a minimal amount of effort is required. Appropriate methods are described in this paper. For the time-history direct integration method of solution, choosing the appropriate Rayleigh constants in order to avoid excessive over- or underconservatism in damping values will be difficult. However, this type of solution method is rarely used in seismic structural analyses. This problem is not unique to the proposed PVRC damping, and approximating the PVRC damping curve would be no more difficult than approximating the constant damping specified in Regulatory Guide 1.61.

• Research Organization: Idaho National Engineering Lab., Idaho Falls (USA)
• DOE Contract Number: AC07-76ID01570
• OSTI ID: 5730345
• Report Number(s): EGG-M-01585; CONF-850670-6; ON: TI85008004
• Country of Publication: United States
• Language: English

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