Conference Publication Details
Mandatory Fields
Broderick, BM; Goggins, J; Elghazouli, AY; Beg, D; Hunt, A; Salawdeh, S; Mongabure, P
2nd European conference on earthquake engineering and seismology (2ECEES)
Shake table testing of concentrically braced steel frames with various gusset plate designs
Optional Fields
Earthquake engineering Steel Structures Connections Gusset plates Design Structural engineering Shake table testing Real time monitoring
Istanbul, Turkey
This paper describes a set of shake table tests investigating the ultimate behaviour of concentrically braced frames (CBFs) with hollow section bracing members and gusset plate connections. Twelve separate experiments were performed on the Azalee seismic testing facility at CEA Saclay, France. The project (entitled BRACED) was carried out as part of the EC FP7 project SERIES (Seismic Engineering Research Infrastructures for European Synergies). The experimental programme was designed to validate empirical models for brace ductility capacity and to assess the influence of gusset plate detailing on brace and frame performance under realistic inelastic dynamic seismic response conditions. The properties of the brace members and gusset plate connections were varied between experiments to examine a range of feasible properties and to investigate the influence of conventional and improved design details on frame response. The brace-gusset plate specimens possessed a range of properties covering the feasible ranges of the following parameters: non-dimensional brace slenderness, λnom; brace cross-section slenderness, b/t; and gusset plate balance factor, βww. All specimens were tested under uniaxial seismic excitation using the same earthquake record scaled to three different levels: (i) low- level with elastic response, (ii) medium-level with brace buckling and yielding, and (iii) high-level with brace fracture. A wide range of response variables were measured in each test, including table and response accelerations and displacements, brace elongation and axial force, and strains in the brace member and gusset plate. Measured brace displacement ductility capacities varied between 2.9 and 12.0, with a mean value of 7.5. The variation between the values identified in each test is attributed to the main test specimen parameters: member slenderness, cross-section slenderness, connection type and gusset plate detailing.
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