Low yield metal shear panels as an alternative for the seismic upgrading of concrete structures

Mistakidis, E.S.; Matteis, Gianfranco De; Formisano, Antonio

doi:10.1016/j.advengsoft.2006.08.043

Cited by 29 publications

(22 citation statements)

References 4 publications

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“…According to the procedure detailed in [13] and based on the 'equal displacements' simplifying assumption, the initial stiffness for the retrofitted structure is defined starting from the knowledge of the corresponding period, leading to the following relationship:…”

Section: The Proposed Proceduresmentioning

confidence: 99%

An innovative methodology for seismic retrofitting of existing RC buildings by metal shear panels

Matteis

Formisano

Mazzolani

2008

Earthq Engng Struct Dyn

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SUMMARYIn the present paper, the seismic upgrading of existing reinforced concrete (RC) structures by means of steel and pure aluminium shear panels is examined. After a preliminary experimental evaluation of the performance of the bare RC structure, a design approach based on the capacity spectrum method has been developed according to the procedure provided in the ATC 40 American guidelines. First, the geometrical configuration of the applied shear panels has been defined according to simplified analytical relationships, while appropriate steel members have been designed to allow the insertion of shear panels in the existing RC structure. Then, complex finite element models have been implemented in order to check the reliability of the proposed design procedure. Also, a numerical evaluation of the global response of the upgraded structure has been processed aiming at evaluating the interaction between the RC structure and the metal devices. Finally, the effectiveness of the applied shear panels has been proven by means of full-scale experimental tests, which confirmed the significant improvement of the RC structure performance, in terms of strength, stiffness and deformation capacity.

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Section: The Proposed Proceduresmentioning

confidence: 99%

An innovative methodology for seismic retrofitting of existing RC buildings by metal shear panels

Matteis

Formisano

Mazzolani

2008

Earthq Engng Struct Dyn

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“…Once the structural deficiencies have been determined, a preliminary retrofitting design can be developed [7]. In particular, after the determination of the displacement level required to the original structure under the design earthquake and the spectral displacement target for the reinforced structure, the shear panel characteristics able to absolve this task can be defined [8,9]. In order to define the actual geometry of shear panels to be adopted, a sophisticated finite element model has been implemented by means of the ABAQUS v. 6.4 non linear numerical code [10], it being described in detail in [11].…”

Section: The Retrofitting Designmentioning

confidence: 99%

Seismic Upgrading of Existing Rc Buildings by Slender Steel Shear Panels: A Full-Scale Experimental Investigation

Formisano¹,

Matteis²,

Panico³

et al. 2008

Volume 4 Number 1

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ABSTRACT:In the present paper the seismic upgrading of an existing RC structure by using slender steel shear panels is examined. Based on a preliminarily experimental evaluation of the performance of the bare RC structure, an ad hoc design procedure has been developed in the framework of the performance based design methodology. The applied device, whose configuration has been defined also according to both simplified and refined numerical analyses, is able to significantly enhance both the strength and the stiffness of the primary structure. It has been installed within a reaction steel frame, positioned into the bare RC structure, which is composed by members designed in order to remain in elastic regimen under the tension field action developed by plates. Since the original RC module was not able to withstand significant values of horizontal forces, the reinforcing of both the first level beam and the foundation beam by means of coupled channel steel profiles and threaded bars has been done. Finally, in order to assess the reliability of the proposed intervention, a full scale cyclic experimental test has been performed on the upgraded structure, confirming the effectiveness of the adopted technique as well as the validity of the proposed design procedure.Keywords: Slender steel shear panels, seismic upgrading, GLD building, experimental test, tension field mechanism, plate buckling INTRODUCTIONIn the framework of new seismic design approaches for upgrading existing reinforced concrete buildings, the development of innovative intervention techniques, based on either the reinforcement of existing structural elements or the introduction of new resisting systems, the metal-based technology approach can be considered very profitable [1]. Such a technique is founded on the energy dissipation capacity of special metallic devices able to achieve or improve the structural safety of the original structure under seismic actions.Within this category, the solution based on using metal shear panels can result particularly effective, due to the limited weight, the reduced volume obstruction, the easy insertion and the meaningful structural contribution offered by the applied devices in terms of strength, stiffness and ductility. In addition, it is important to observe that the self-weight of steel panels is rather low, if compared with the one of a reinforced concrete shear wall, determining in this way a reduction of gravitational loads and therefore of seismic actions transmitted to the foundation.Nowadays, metal shear panels adopted in seismic applications can be subdivided in two main behavioural classes: 1) the so-called "compact" panels, mainly made of low strength metallic materials (LYS steel or pure aluminium) and properly stiffened in order to avoid elastic shear buckling phenomena, which have been recently proposed for high steel buildings and also for reinforcement of RC buildings [2]; 2) the "slender" shear panels, made of thin steel plates, which have been widely studied and applied both in North America and ...

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“…These are usually �-Al 5 FeSi, �-Al(FeMn)Si, Al 9 Mn 3 Si and Mg 2 Si, either as single constituents or as complex eutectic clusters [13,14]. During the homogenisation process, phases such as Mg 2 Si dissolve, or transform and change their shape, e.g. needles of �-Al 5 FeSi change into spheres of �-Al(FeMn) Si phase.…”

Section: Introductionmentioning

confidence: 99%

“…After casting, the microstructure is not suitable for extrusion and has an inhomogeneous chemical composition, �-Al dendrites with various phases at the borders or in the interdendritic areas. These are usually �-Al 5 FeSi, �-Al(FeMn)Si, Al 9 Mn 3 Si and Mg 2 Si, either as single constituents or as complex eutectic clusters [13,14]. During the homogenisation process, phases such as Mg 2 Si dissolve, or transform and change their shape, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The use of aluminium alloys (AAs) in the construction and transportation industries has increased in the past decade because of the increasing demand for lightweight constructions and fuel-efficient vehicles [1,2]. AAs have lower density and medium strength, but compared with construction steels, they have a higher ratio of yield strength to density.…”

Section: Introductionmentioning

confidence: 99%

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Influence of cooling mode in relation to casting and extrusion parameters on mechanical properties of AA6082

Malej

Terčelj

Peruš

et al. 2017

Materials and Geoenvironment

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In this study, conditional average estimator neural networks (CAE NNs) were used for an analysis of the common influences of the cooling mode in relation to the ram speed, extrusion ratio, casting speed and casting temperature on the yield strength and the elongation of an extruded profile made from aluminium alloy (AA)6082. The obtained results from the analysis revealed very complex relationships between these parameters. In order to maximise the values for the yield strength and the elongation, the values for the ram speed, extrusion ratio, casting speed and casting temperature should be optimised in relation to the mode of cooling.Key words: AA6082, intermetallic phases, hot extrusion, mechanical properties, neural networks Izvleček V tem delu smo uporabili CAE (ang. conditional average estimator, slo. cenilka pogojnega povprečja) nevronske mreže za analizo skupnega vpliva načina ohlajanja v povezavi s hitrostjo bata, iztiskalnim razmerjem, hitrostjo ulivanja in temperaturo ulivanja na mejo tečenja in raztezek iztiskanega profila iz aluminijeve zlitine 6082. Dobljeni rezultati iz analize so pokazali kompleksen vpliv parametrov na mejo tečenja in raztezek. Da lahko izboljšamo vrednosti meje tečenja in raztezka, moramo vrednosti za hitrost bata, iztiskalnega razmerja, hitrosti ulivanja in temperature ulivanja optimizirati v povezavi z načinom ohlajanja.Ključne besede: AA6082, intermetalne faze, vroče izstiskavanje, mehanske lastnosti, nevronske mreže

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Low yield metal shear panels as an alternative for the seismic upgrading of concrete structures

Cited by 29 publications

References 4 publications

An innovative methodology for seismic retrofitting of existing RC buildings by metal shear panels

An innovative methodology for seismic retrofitting of existing RC buildings by metal shear panels

Seismic Upgrading of Existing Rc Buildings by Slender Steel Shear Panels: A Full-Scale Experimental Investigation

Influence of cooling mode in relation to casting and extrusion parameters on mechanical properties of AA6082

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