Abstract
The recent technological advances on steel production process allowed introducing in construction market steel grades with significantly high yield strength. These new materials are known as High Strength Steel (HSS). The use of these steel grades offers economical and mechanical benefits compared with mild carbon steel (MCS). Consequently, their use is constantly increasing especially for seismic applications that are the rational field to exploit the high performance of HSS, by means of the “dual-steel” concept, which combines the HSS with MCS in order to provide overstrength to non-dissipative element and ductility to dissipative ones, thus controlling the global frame behaviour into a ductile overall failure mode. In this paper, a comprehensive parametric study devoted to investigate the seismic performance of Eurocode 8 compliant dual-steel chevron Dual-Concentrically Braced Frames (D-CBF) is presented and discussed. This structural typology is composed of two dissipative sub-systems acting in parallel, namely Moment Resisting Frames (MRFs) and Concentrically Braced Frames (CBFs). Static nonlinear pushover analyses were carried out in order to assess the seismic performance of the D-CBFs. The examined parameters cover both geometric and mechanical variables, as the type columns, span length, number of storeys and spectral shape. The analyses showed that the use of HSS in Eurocode 8 compliant D-CBFs is effective to avoid the damage in non-dissipative members. On the other hand, the use of HSS leads to design flexible members, especially for the braced-intercepted beams, resulting in poor performance of bracing members due to significant damage concentration. The economic evaluation shows that the use of HSS allows reducing the material consumptions and dropping the total constructional costs.
Highlights
The recent technological advances on steel production process allowed introducing in market steel grades with attractive properties like the increase of yield strength
The capacity curves from pushover analyses for both 1st Mode and Uniform patterns are shown in Figs. (7) and (8), where the axis of ordinates corresponds to base shear normalized with the design base shear, while the roof displacements are reported in abscissas
The frames located in soft soil are designed considering a larger base shear due to their design spectrum with large corner period Tc, resulting in stronger and stiffer structures than those designed for stiff soil
Summary
The recent technological advances on steel production process allowed introducing in market steel grades with attractive properties like the increase of yield strength. The S355 steel grade was considered as high strength steel (HSS) until forty years ago. Even though the steel market delivers larger prices for the HSS over MCS, the reduction of the material consumption due to higher yield strength may allow reducing the total costs of the construction. The increase in steel strength may guarantee advantages especially when it is applied in nondissipative structural members [2]. These members are designed to remain elastic during an earthquake and are responsible for the robustness of the structure and prevention of collapse, being characterised by high strength demands. Specific zones should allow the development of plastic deformations
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