Experimental Behavior and Mechanical Modeling of Dissipative T-Stub Connections

Abstract

In case of Moment Resisting Frame (MRFs), most recent version of Eurocode 8 allows dissipating the seismic input energy by means of the plastic engagement of beam-tocolumn joints provided that their dissipative characteristics under cyclic loads are demonstrated to be adequate. In previous works of the authors, design criteria able to detail beam-to-column joints so as to engage in plastic range different joint components have been pointed out. Furthermore, the accuracy of the design criteria\ud have been verified by means of an experimental program devoted to compare the dissipative characteristics of four real-scale beam-to-column joints designed to possess the same resistance but different dissipative characteristics.\ud In this paper, on the base of past research efforts' dealing with testing and modeling of isolated T-stubs and beam-to-column joints, an innovative approach is presented. As a consequence of a previous experimental program devoted to the comparison of the dissipative behavior of classical and dissipative T-stubs characterized by X-shaped flanges, an innovative double split tee joint fastening the beam to the column through X-shaped T-stubs is presented and its behavior under cyclic loads is experimentally\ud compared to that of a classical detail. Furthermore a design criterion able to obtain an X-shaped T-stub joint with same resistance and stiffness of a classical T-stub joint is presented and its accuracy is verified on the base of the obtained experimental results

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.…”

“…The solution obtained in the previous section, needs the evaluation of q lim1 , q lim2 , a 5 /L, a 8 /L and at least one between a 2 /L and a 3 /L.…”

“…For any given value of m db , by varying the non-dimensional parameter M p /qL 2 in the range between 1/16 and zero, which covers all the possible design situations, the values of a 2 , a 3 , a 5 and a 8 have been computed. Tables 1-6 for m db equal to 0.4, 0.5, 0.6, 0.7, 0.8, and 0.9 respectively.…”

“…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.…”

Numerical Analysis Of The T-stub Beam-to- Column Hysteretic Behavior Affected By Beam Height

“…As it have a strong bearing capacity, excellent ductility performance, does not need welding , environmental protection and fast during the construction process, the T-stub Semi-rigid beam-to-column connections have a good application prospect of promotion [4]. Therefore, many related research of bearing capacity and seismic performance for T-stub Semi-rigid connections carried out by international scholars [5][6][7].As a ordinary T-stub connection, the upper and lower flange of the beam connected to the column through connecting plate, and there is no connection on the beam web. Therefore, mechanical properties of the nodes directly connected with the size of the beam section height.…”