000013188 001__ 13188
000013188 005__ 20161114160331.0
000013188 04107 $$aeng
000013188 046__ $$k2009-06-22
000013188 100__ $$aMpampatsikos, V.
000013188 24500 $$aAssessment of the equivalent viscous damping ratio for hybrid wall-to-foundation connections of precast wall panels

000013188 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013188 260__ $$bNational Technical University of Athens, 2009
000013188 506__ $$arestricted
000013188 520__ $$2eng$$aIn the last decade, efficient solutions based on the concept of “controlled rocking” (hybrid) behaviour have been proposed for both beam-column and wall-to-foundation connections of precast members. These systems show the benefits of minimizing the residual displacements (using unbonded post-tensioning tendons), limiting the damage to the connection interfaces (thanks to the rocking mechanism) and controlling the maximum displacements (through the introduction of dissipative devices). The direct displacement based design (DDBD) procedure appears as a suitable method to control the peculiar rocking behaviour of these systems. This procedure requires the determination of the structural properties at the design displacement. In particular, the correct assessment of the equivalent viscous damping ratio ξeq is fundamental to get reliable results. Nevertheless, few studies dealt with the definition of ξeq of “hybrid” systems, furnishing formulas valid only for limited cases. The shape of the hysteretic loops has been recognized to be function of the value of the parameter λ, defined as the ratio of the re-centring to the dissipative bending moments. This paper addresses the precast panel walls characterized by “hybrid” wall-to-foundation connections, with the following aims: i) realizing a reliable numerical model; ii) developing formulae and charts which allow a proper evaluation of the required amount of post-tensioned and mild steel as function of the design point and the chosen value of λ; iii) suggesting expressions and charts to assess correctly the value of ξeq as function of the ductility, through an extensive campaign of nonlinear quasi-static and dynamic analyses, for different values of λ.

000013188 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013188 653__ $$aHybrid precast wall panels, Re-centring capacity, Direct displacement based design, Equivalent viscous damping ratio. Abstract. In the last decade, efficient solutions based on the concept of “controlled rocking” (hybrid) behaviour have been proposed for both beam-column and wall-to-foundation connections of precast members. These systems show the benefits of minimizing the residual displacements (using unbonded post-tensioning tendons), limiting the damage to the connection interfaces (thanks to the rocking mechanism) and controlling the maximum displacements

000013188 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013188 720__ $$aMpampatsikos, V.$$iBolognini, D.$$iNascimbene, R.
000013188 8560_ $$ffischerc@itam.cas.cz
000013188 8564_ $$s1024388$$uhttps://invenio.itam.cas.cz/record/13188/files/CD254.pdf$$yOriginal version of the author's contribution as presented on CD, section: Soil-structure interaction.
000013188 962__ $$r13074
000013188 980__ $$aPAPER