Precast concrete, steel-braced, hybrid pipe rack structures

Vaquero, Sebastián F.; Correa, Damián R.; Wolkomirski, Sergio F.
October 2013
PCI Journal;Fall2013, Vol. 58 Issue 4, p55
Academic Journal
The construction of a pipe rack in an operating petroleum refinery located in a high seismic zone in Argentina presents singular issues related to its construction and structural typology. In this particular case the structure was required to be made of precast reinforced concrete, as requested by the client to facilitate its construction, minimize on-site work, and comply with the applicable Argentinean regulatory requirements. In addition, the lack of bracing in the cross section was required to allow for maintenance of the pipes. To comply with the boundary conditions, it was proposed to use precast reinforced concrete moment frames with a single cast-in-place concrete connection as the transverse load-resisting system, longitudinal precast reinforced concrete beams as shear keys, and steel bracing as the longitudinal load-resisting system. The connections comply with the requirements of the seismic code, taking into account the erection tolerances and minimizing on-site concrete work as well as working at heights. This paper explains the calculation methodology and presents the results of the erection of the precast concrete frames.


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