Experimental analysis of innovative dissipative bolted double split tee beam‐to‐column connections

Abstract

The use of double split tee (DST) connections in seismic zones may represent an interesting solution from the technological point of view because of easy substitution of damaged components after destructive seismic events. But despite this significant advantage, partial‐strength DST connections have found limited application so far because their use requires that tee elements are characterized by high plastic deformation capacity to assure adequate energy dissipation. Therefore, in order to overcome the limitations to the energy dissipation capacity of traditional DST connections due to significant pinching of hysteresis loops and aiming at the development of a structural solution able to withstand severe seismic events without damage to members and connecting elements, this paper proposes two different innovative dissipative solutions for DST connections and investigates their performance by means of an experimental programme whose results are presented and discussed.

The Influence of Gravity Loads on the Seismic Design of RBS Connections

“…(3)(4)(5)(6)(7)(8)(9) it is evident that the range where "dog bones" can be located, assuring the protection of the beam-to-column connections, decreases as m db increases. In particular, for high values of m db the width of such range is so limited that it could be incompatible with the length of the weakened beam zone required for an appropriate spreading of plasticity.…”

“…For this reason experimental investigations on the cyclic response of partialstrength connections have gained new attention [2][3][4][5][6][7][8][9][10][11]. RBS connections can be considered a particular typology within the framework of partial-strength connections, because their flexural resistance is less than the one of the connected beam.…”

Eccentrically Braced Frames Designed for the Energy Dissipation Optimization

“…In addition, external plates have slotted holes also in vertical direction to allow vertical displacement due to vertical loads (Figure 4). Adopted bolts are high resistance class 8.8 while the friction material adopted (FREEDAM project) is sprayed aluminum that is able to exhibit a friction coefficient of about 0.5 [38]- [39]. …”

Numerical investigation on the effect of externally exerted loads on particular bolts forces in the multi-bolted flange joint

“…Z kolei podatność elementów łączonych coraz częściej wyznacza się za pomocą MES, przy czym na ogół stosuje się następujące modele: W przypadku łączenia pary elementów konstrukcji bardzo często wykorzystuje się połączenia wielośrubowe. Są one typowe dla struktur, w których przed rozpoczęciem ich eksploatacji wprowadza się napięcie wstępne śrub [3,6,17,31]. Siły w śrubach są przykładane według przyjętej kolejności napinania [9,12,16] oraz założonego sposobu napinania [1,32].…”