Browsing by Author "Zareian, Farzin"

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    Cyclic behavior and design methodology of exposed base plates with extended anchor bolts
    (2022) Torres-Rodas, Pablo; Medalla, Miguel; Zareian, Farzin; Lopez-Garcia, Diego
    This paper investigates the behavior of a ductile detail of exposed base plates. This detail consists of a base plate anchored to the concrete foundation through bolts extended to a steel chair configuration. The intention is to concentrate plastic strains mainly in the extended region of the anchor bolts, forcing the other connection components to remain elastic. The scientific background of this research consists of a series of sophisticated nonlinear finite element models subjected to a cyclic load protocol in the presence of an axial compressive force. The models were validated against an experimental test reported in the literature. Forces within the connection components, stresses, strain distributions, and deformation modes were examined. A total of sixteen three-dimensional nonlinear models were created using the ABAQUS simulation platform. The models were sepa-rated into two groups: the first consists of models with dimensions similar to the specimens tested in recent experimental programs reported in the past, while the second group simulates connections representative of mid-rise industrial frames. Building on the insights gained from the simulations of the first group, a methodology is proposed to design these column base connections. This suggested methodology is validated with the second group of simulations. Results indicate that the studied configuration detail presents some advantages compared with the traditional detail presented in Design Guide 1. For instance, plastic strains are developed almost exclusively in the anchor rods, and no damage is expected at the remaining components. Another essential characteristic is the exposed stretch length, with which it is possible to achieve a target design rotation without significant strain concentrations in the anchor rods. This characteristic facilitates post-earthquake inspections and repairs, and damage is virtually eliminated in the first story.
  • Thumbnail Image
    Item
    Reconnaissance Report of Chilean Industrial Facilities Affected by the 2010 Chile Offshore Bio-Bio Earthquake
    (EARTHQUAKE ENGINEERING RESEARCH INST, 2012) Zareian, Farzin; Aguirre, Carlos; Felipe Beltran, Juan; Cruz, Ernesto; Herrera, Ricardo; Leon, Roberto; Millan, Arturo; Verdugo, Alejandro
    This paper summarizes findings of an EERI reconnaissance team and a group of Chilean experts on damage to industrial facilities caused by the 27 February 2010 Offshore Bio-Bio Earthquake and ensuing tsunami. Chile's industry as a whole was severely affected when major industrial plants such as paper mills, wood mills, thermoelectric power plants, and oil and gas refineries were shut down following the earthquake either in response to the damage sustained or to maintain structural and environmental safety. Damage resulted primarily from ground shaking; however, it was exacerbated by the ensuing tsunami in coastal areas. Important industrial sectors, such as the wine industry and fishing, pulp and paper industries, suffered severely. Observed damage was primarily due to inadequate anchorage of equipment, differential movements between adjacent supports of piping and equipment, foundation displacements, and failure of nonstructural elements and equipment. [DOI: 10.1193/1.4000049]
  • Thumbnail Image
    Item
    Seismic characterization of steel special moment frames subjected to megathrust earthquakes
    (2020) Medalla, Miguel; López García, Diego; Zareian, Farzin