Experimental analysis on cyclic performance of concrete columns with TempCore or Dual-Phase steel reinforcement
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Experimental analysis on cyclic performance of concrete columns with TempCore or Dual‑Phase steel reinforcement Silvia Caprili1 · Giuseppe Chellini1 · Francesca Mattei1 · Federico Romis1 · Walter Salvatore1 Received: 13 January 2020 / Accepted: 16 September 2020 © Springer Nature B.V. 2020
Abstract The present paper shows the results of an experimental test campaign on RC base column joints realized using three different typologies of steel reinforcing bars. Traditional TempCore®B450C rebars were adopted in comparison with enhanced ones with DualPhase microstructure. The interest in the use of such kind of reinforcing grade comes from its improved performance in terms of durability in presence of aggressive environmental conditions, being able to provide a lower decrease of the deformation capacity, with residual values higher respect to minimum imposed by current standards. Being characterized by the typical undefined yielding stress–strain behaviour, Dual-Phase steel reinforcing bars need an accurate characterization to be used. In the present work experimental tests on RC-DP sub-structures were performed to assess their structural performance in presence of cyclic/seismic loading conditions, comparing results with traditional RC-TempCore® structures’ behaviour. Keywords Steel reinforcing · Deformation capacity · Dual-phase steel · Experimental test · Cyclic behaviour · Base column joint
1 Introduction Reinforced concrete (RC) buildings represent a large slice of the modern construction heritage, widely developed starting from the first decades of the twentieth century and progressively diffused during the second world war’s reconstruction phase thanks to their versatility, cheapness compared to other structural typologies, easiness and speed in realization. Indeed, the introduction of reinforcements in constructions dated back even before, with systems patented by Melan and Hennebique in the 1890s immediately become of common use around the world for relevant structures like bridges. First RC buildings adopted smooth reinforcing steel bars, characterized by good levels of strength and deformation but affected by problems of relative slip between the bars and the surrounding concrete. The ‘old’ rebars were mainly plain round (or eventually square) section of ‘mild’ steel, * Silvia Caprili [email protected] 1
Department of Civil and Industrial Engineering, University of Pisa, Pisa, Italy
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Vol.:(0123456789)
Bulletin of Earthquake Engineering
with low yielding strength (around 230 MPa). Over the years, strength levels progressively increased in parallel to modification of the metallurgical and chemical characteristics, providing materials with improved performance (Munter and Lume 2018), resulting in yielding strength around the ones foreseen by current standards (400–600 MPa) with the typical ribbed surface. Several studies developed with the aim of investigating the effective structural performance of old RC constructions: the main objective was to compare the behaviour of such buildin
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