Seismic design and performance of composite frames

Abstract

In this study, the seismic design and performance of composite steel-concrete frames are studied. The new Eurocode 4 and Eurocode 8, which are in a preliminary stage at the moment, are employed for the design of six composite steel-concrete frames. The deficiencies of the codes and the clauses that cause difficulties to the designer are discussed. The inelastic static pushover analysis is employed for obtaining the response of the frames and the overstrength factors. The evaluation of the response modification factor takes place by performing incremental time-history analysis up to the satisfaction of the yield and collapse limit states in order to investigate the conservatism of the code. The last purpose of this study is to investigate if elastically designed structures can behave in a dissipative mode.

Seismic performance of a 3D full‐scale high‐ductile steel–concrete composite moment‐resisting frame—Part II: Test results and analytical validation

“…The design of the prototype and test structures is described in the companion paper [1]. In particular, the design base shear per frame was equal to 0.167 augmented to take into account the accidental torsion = 1.15 [4], Such high levels of overstrength are not unusual in moment-resisting frame structures [22,23] and the dependable portion of these values could be used in seismic design. Lateral overstrength up to the first significant yielding can be attributed to: (i) the partial safety factors adopted in design; (ii) the interstorey drift limits enforced to satisfy the SLS; (iii) the design constraints provided by non-seismic actions like gravity loads on columns; (iv) the difference between nominal strength and measured strength of materials; (v) the use of discrete standard dimensions of steel section profiles, and (vi) neglecting the beam-to-column joint flexibility in the calculation of the design moments for joints.…”

The seismic performance of a semi-rigid composite joint with a double-sided extended end-plate. Part I: Experimental research

“…The project also allowed typical details for bolted beam-to-column joints. Since then, additional tests have been performed to assess the advantages provided by composite structures, in terms of the plastic capacity and increased strength and stiffness [5][6][7][8]. A large * Corresponding author.…”

Dynamic response of composite frames with different shear connection degree

“…The seismic responses of the steel frames were evaluated and compared in terms of maximum interstory drift and maximum top lateral displacements. Thermou et al [6] tested numerically six composite frames designed according to the provisions of Eurocodes 4 and 8. Again, full shear connection and fully restrained joints were assumed.…”