Seismic Performance Assessment and Probabilistic Repair Cost Analysis of Precast Conc

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Seismic Performance Assessment and Probabilistic Repair Cost Analysis of Precast Concrete Cladding Systems for Multistory Buildings

Author: Hunt, Jeffrey Patrick | Size: 10.1 MB | Format: PDF | Quality: Unspecified | Publisher: University of California, Berkeley | Year: 2010 | pages: 302

Analytical and experimental tests have shown that the seismic response of multistory moment-frame structures with precast concrete cladding in moderate to severe earthquakes is
significantly influenced by the cladding system. Moreover, considerable damage to the cladding system components from recent earthquakes has been reported. The cladding system can account for a significant portion of the initial cost of a building, often as much as 20%. However, inseismic analysis and design, engineers typically ignore the additional stiffness and damping thatthe cladding system may provide, which could prove to be beneficial or detrimental to the building’s seismic performance. Most of the efforts in nonlinear dynamic modeling focus on representing the behavior of structural elements and do not include the effects of non-structural elements such as cladding systems. The purpose of the research discussed in this dissertation is to study the effect that the cladding system has on the structural response of multistory buildings,
to develop analytical equations to estimate the seismic demands in the cladding connections, tocalculate the probability of failure of typical cladding connections, and to determine the postearthquakerepair costs and repair times of typical cladding systems. The nine-story LA SAC steel moment-frame building is selected as the study building,and a two-dimensional, nonlinear model is developed of the bare-frame structure in OpenSees.
The steel moment-resisting frame of the bare-frame structure is modeled using nonlinear force beam-column line elements capable of representing distributed plasticity along their length. The frame connections are reduced-beam section (RBS) moment connections, and their modeled cyclic moment-rotation behavior is based on experimental test results of the connection. Analytical models of three different precast cladding designs are applied to the bare-framestructure to study their effect on the building’s seismic response. The three cladding designs represent common systems used in regular multistory buildings in modern construction. The first
cladding design, cladding type C1, consists of alternating horizontal bands of spandrel panels (covering the exterior floor beams) and glazing. The spandrel panels extend the full width of the bay. The second cladding design, cladding type C2, consists of spandrel panels that extend the full height of the story with rectangular window openings “punched” into their surface. The third cladding design, cladding type C3, consists of the same spandrel panels as in type C1 with column cover panels spanning between adjacent spandrel panels. The force-deformation curves of the connections used in the model are obtained from experimental tests of push-pull

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