6926475982

Kraftwerk Union AG. Offenbach. W. Germany. Siemens Res. Dev. Repts.. 12 (6). pp 395-401 (1983) 8 figs, 4 tables (In German)

K«y Word*. Piping systems. Supports. Seismic excitatk>n, Crash rasaarch (aircraft)

Raalistic tett* of detailed modeled piping element* and systam tection* yielded by raaeon of nonlinaar synem behavłor, a high degree of conteryatitm oompared with linaar alastic anaiytit. The peak* of streu and strain calcu-latad with uaual analytical mathods wara withgtood without loss of structural integrrty. in n>ite of axcaading tha alastic ranga of materiał behevior by far. Tha pracakulatad anchor loads wara considarably high ar than tha ioadt m aa su rad. Thaaa. in turn, wara highar than tha edmittibie anchor ioad*. but no failore of tha pipa aupport "ccurrad.

84-1757

A Comparative Study of Combination Methods Uaed in Reaponae Spectrum Amdyaia of Nu elear Piping Systems

S. Gupta, D.P. Jhaveri, 0. Kustu. and J.A. Blume URS/John A. Blume & Associates, Engineers. San Francisco, CA 94105, J. Pressure Vessel Tech., Trans. ASME.J06 (1), pp 25-31 (Feb 1984) 3 figs. 7 tables. 9 refs

Key Word*: Piping system*, Nuclaar raactors, Saismic re-sponaa

Tha diffarant mathods of combining rasponsas for lndividual moda* and directions for rasponsa spectrum analysis of nuclaar piping system* ara avaluatad. For tha purposaof tha study. dynamie rasponsas of 20 typical piping systems using nina diffarant combination mathods ara systematkallv com-pared.

Dynamie teits wara conductad involving notched sactionsof 4-in. (10-cm) stainless Steel and lnconal-600 pipa. Tha specimen was a four-point bending baam with and massas sizad to give an alastic first-mode frequency naar that of typical field-installed piping system* (15 Hz). Specimen* wara loaded using sinewave axcitation at this first moda natura! frequency. Specimen rasponsa was compered to pradictions from an etastic-plastic dynamie analysis prtvi-ousły davalopad on this program. Specimen loads at failura wara also oompared to those pradictad from a net section collapsa failura criterion.

84-1759

Modli Antłysis Incłuded in the Struć tu rai Dynamicil Analysis of Large-bore Piping Systems (Modalanalyae im Rahmen des dynamiachen Nachweises Hfr grosae Rohrfeitiuigen)

H.-J. Wehling, W. Schuz. W. Schrader, and F. Zerr-mayr

Kraftwerk Union AG, Erlangen. W. Germany. Siemens Res. Dev. Repts., 12.(6), pp 379-385 (1983) 14 figs, 4 tables. 1 ref (In German)

Kev Words: Piping systems, Modal analysis, Finite element tachniqua, Computer program*. Nuclaar Power plant*

Fimte-eJement-computer program* ara usad to precaiculate tha dynamie behavior of large-bore piping systems. Computer input is checked by random comparison of the result* of computational and experimental modal analysis. Racantly forcad vibration test* wara carriad out at aavaral nuclaar powar stations. Maximum tuba dimansions wara up to 600 mm O.D.. 80 m in langth, 100 t in weight. Computad and ampirical aiganwiluas agreed wali.

DUCTS

84-1758

Dynamie Tests of Cracked Pipę Components

D A. Hale. J.D. Heald.and S R. Sharma General Electric Co., Nuclear Energy Business Opera-tions. San Jose, CA 95125. J. Pressure Vessel Tech.. Trans. ASME.K&d). pp 37-46 (Feb 1984) 22 figs, 2 refs

Key Words: Pipas (tubas), Cracked media, Steel. Oyrtamic tests

84-1760

Dynamie Characteristica of a Jet Engine Test Faciity Air Supply

M.L. Ross

Air Force Inst. of Tech., Wright-Patterson AFB, OH, Rept. No. AFIT/GAE/AA/83D-20. 154 pp (Dec 1983)

AD-A136 910

Kay Words: Ducts, Jat engines. Test facilitias

Dynamie re*x>nse of a scala modal of a test facility air supply ducting was datarminad axparimantally over a fra-

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