Seismic response of Cfs strap-braced stud walls: Experimental investigation

Abstract

Strap-braced stud walls.2 HIGHLIGHTS  The seismic behaviour of CFS strap-braced walls is evaluated by experimental investigation. The global inelastic response of a wide range of X-braced walls is discussed. The local behaviour is investigated by tests on material and connection systems. The behaviour factor provided by AISI S213 are confirmed by the experimental tests. The capacity design rules of Eurocodes are also reliable for the CFS structures. ABSTRACTThe development of light weight steel structures in seismic area as Italy requires the upgrading of National Codes. To this end, in the last years a theoretical and experimental study was undertaken at the University of Naples within the Italian research project RELUIS-DPC 2010-2013. The study focused on "all-steel design" solutions and investigated the seismic behaviour of strap-braced stud walls. Three typical wall configurations were defined according to both elastic and dissipative design criteria for three different seismic scenarios. The lateral in-plane inelastic behaviour of these systems was evaluated by twelve tests performed on full-scale Cold-formed strap-braced stud wall specimens with dimensions 2400 x 2700 m subjected to monotonic and reversed cyclic loading protocols. The experimental campaign was completed with seventeen tests on materials, eight shear tests on elementary steel connections and twenty-eight shear tests on strap-framing connection systems. This paper provides the main outcomes of the experimental investigation. Furthermore, the design prescriptions, with particular reference to the behaviour factor and the capacity design rules for these systems, have been proved on the basis of experimental results.

Seismic response of Cfs strap-braced stud walls: Theoretical study

“…In particular, the stiffness for Simpson's hold-down similar to those used for the tested wall prototypes are in the range between 15 and 38 kN/mm. The stiffness of the anchorage system used in the wall specimen tested in the presented research has been evaluated on the basis of the up-lift displacements measured during the tests, and the obtained value is about 20 kN/mm [22].…”

“…For connections, also Equation (21) has been satisfied. All geometrical dimensions and materials of the wall components designed for the investigated walls are presented in companion paper [22].…”

“…Based on the results of the critical analysis, the design hypotheses have been defined for the development of the design of case study buildings (Section 5), from which the wall configurations tested in experimental phase have been selected. The results of the experimental phase of the research are widely described and illustrated in the companion paper [22].…”

11.01: Shaking table tests on cold‐formed steel building sheathed with gypsum panels

“…Finally, Schafer et al [5] tested a full-scale two-story 15.2 m × 7.0 m (plan dimensions) × 5.8 m (high) CFS-framed building under a series of dynamic excitations during different phases of construction. In past years, extensive studies were carried out at University of Naples "Federico II" in order to better understand seismic performance of CFS buildings (Fiorino et al [6,7], Iuorio et al [8][9][10] and Macillo et al [11]). More recently, the University of Naples was involved in the research project named "Energy Efficient LIghtweight-Sustainable-SAfe-Steel Construction" (Project acronym: ELISSA), which was funded by European Commission under the Seven Framework Programme (www.elissaproject.eu).…”

Seismic capacity-based design of narrow strap-braced cold-formed steel walls

“…Fiorino et al [17] did develop a design method for oriented strand board (OSB) sheathed shear walls, which was implemented in Italy; this method however, is not applicable for strap-braced walls. Macillo et al [18] have established links with the existing Eurocode 1998-1-1 [15] for hot-rolled steel cross-braced frames and that of the cold-formed steel strap-braced walls tested by Iuorio et al [19] and others. This Eurocode 1998-1-1 standard contains provisions for traditional hot-rolled steel concentrically braced frames with X diagonals, including tensiononly configurations.…”