Overall Analysis Of Pipe Racks In Industrial System

More and more pipe racks in industrial system in 1950s and 1960s approach or exceed their useful life, some are seriously damaged for environmental impact. At the same time, production requirements cause multifarious arrangement, mixture of old and new and different stent structure types in the same section. At present there is no corresponding specification and guidance for detection and evaluation for pipe racks. According to using status and characters of pipe racks,combing existing standards, the paper formulates scientific and reasonable scheme to do the seismic appraiser and reliability evaluation, providing basis for reinforcement and transformation.In design and calculation of pipe racks in industrial system, mostly design methods based on structure are taken, which consider pipe racks exert no effect on stiffness and property of pipelines, to design and calculate regarding it as load applied to pipe racks. Such a design method has great difference with actual stress of pipe racks , and it is more practical to calculate integer structure taking interaction of pipe racks and pipelines into consideration. This paper does research on pipe racks from the aspects of reliability evaluation,bearing capacity calculation and analysis of overall seismic performance.(1)According to the existing regulations and potential safety hazard of pipe racks, the paper puts forward reasonable scheme for reliability evaluation of pipe racks in industrial system.(2)For independent pipe racks, it calculates models based on structure and overall model of nonstructural components. Through the bearing capacity calculation, compares the differences of two results, analyzes the causes and influence factors of differences.(3)It makes overall models for unit of pipe racks, and does anti-seismic calculation by equivalent base shear method,response spectrum method and time history method. For Software SAP2000 can simulate interaction of pipe racks and pipelines much conveniently and reasonably, it calculates whole modeling of pipe racks and pipelines by Software SAP2000 in this paper, compares and analyzes influences of pipelines to overall capacity and seismic performance of pipe racks.