1,721,101 research outputs found
Recent advances in the technologies of connection for panel structures: Design and cost analysis of different solutions with X-shaped dissipative connectors
No full textRecent advances in the technologies of connection for panel structures: development of an hysteretic damper for industrial buildings
No full textBackground: The most recent seismic events occurred in Italy have highlighted some of the drawbacks of precast concrete industrial buildings and especially those related to the connecting systems traditionally employed to fasten the cladding panels to the internal framing. In fact, in many cases, the out-of-plane collapse of the external walls has been observed due to the problems related to the poor behaviour exhibited under cyclic loads by the connectors used to join the panels to the perimeter beams.
Objective: In light of these outcomes, in this work, the possibility to improve the traditional structural details of industrial buildings by proposing the adoption of a dual system composed by the internal pendular columns and the external walls is examined.
Method: It is provided to substitute the joints classically adopted at the top of the walls with a connection able to work as a slider with vertical axis and to insert at the bottom of the walls two or more hysteretic dampers recently patented at the Italian Patent Office after revision of the European Patent Office (EPO). With this approach, with respect to the classical design philosophy, due to the participation of the cladding panels, the structure is stiffened, obtaining an improved due to the additional source of energy dissipation represented by the dampers located at the base of the walls.
Results and Conclusion: The effectiveness of the suggested approach is verified by evaluating the results of pushover analysis carried out on a building designed following the proposed approach
A Theoretical Model for Predicting the Rotational Capacity of Steel Base Joints
No full textThe last version of Eurocode 8 has opened the door to the design of Moment Resisting steel Frames (MRFs)
promoting the dissipation of the seismic input energy in the joints. Within this framework, in order to provide
the basic tools for the prediction of the main parameters characterizing the monotonic and cyclic behaviour of
joints, in the last two decades, many experimental and theoretical studies have been carried out. As a result of
this effort, in EC3 the formulations for predicting stiffness and resistance of common joint typologies have
been codified. Despite this, dealing with the rotation capacity of base joints, there is still a lack of knowledge.
In order to overcomethe knowledge gap surrounding the evaluation of the plastic rotation capacity of base joints,
in this paper the development of amathematicalmodel able to evaluate the ductility supply of exposed base plate
joints is presented. Within the framework of the component method, a mechanical approach for predicting the
rotational capacity of base plate joints is set up starting from the definition of the ductility supply of the single
joint components. Furthermore, the proposed mechanical model is validated by means of the comparison with
three full scale experimental tests carried out at the University of Salerno
Design of X-shaped double split tee joints accounting for moment–shear interaction
No full textDealing with steel moment resisting frames (MRFs), the latest version of Eurocode 8 allows us to dissipate the seismic input energy in connections provided that their characteristics under cyclic loads are certified by means of experimental testing. Within the beam-to-column joint typologies to be used in seismic resistant steel frames, the double split tee joint (DST) represents an interesting solution due to its easy fabrication and repair after a destructive seismic event. Nevertheless, the cyclic behavior of this joint typology is usually characterized by pinching and strength degradation phenomena due to the plastic engagement of the rectangular T-stubs which compromises the use of DST joints as dissipative elements. Within this framework, in this paper, in order to improve the hysteretic behavior of this connection typology, a new type of dissipative DST joint is presented. In particular, the proposed dissipative T-stub is designed substituting the rectangular T-stubs with the so-called Xshaped T-stubs, whose flange plates are cut into an hourglass shape similar to that of ADAS dampers. In particular, in the paper, a model that is able to predict the resistance of the proposed X-shaped T-stubs accounting for moment–shear interaction is developed and rules for designing the optimum shape of dissipative DST joints are proposed. Finally, the results of an experimental activity on real scale joints are presented aiming to verify the reliability of the proposed design approach and to compare the cyclic behavior of classical and X-shaped DST joints evidencing the benefits provided by the proposed dissipative joint
A Theoretical Approach for the Prediction of the Rotational Capacity of Steel Column Base Joints
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Experimental Analysis on the Cyclic Response of Beam to Column Joints: State-of-the-Art at Salerno University
No full textAiming to provide a contribution to the codification of design rules for dissipative joints to be applied to MRFs, in last five years, a comprehensive experimental and analytical work dealing with the cyclic behaviour of beam-to-column joints has been developed by the research group of the University of Salerno. In particular, the activity has regarded the study of both classical and innovative typologies characterized by the same initial stiffness and resistance but by different hysteretic behaviours due to the different source of energy dissipation supply imposed in the design process. In this paper, the main results of such a study, performed at the laboratory of materials and structures of the University of Salerno, are reported in order to provide an overview on the main mechanisms involved in the energy dissipation of partial-strength connections. A particular attention is given to the design issues by presenting the procedures aimed at providing to the joints adequate characteristics in terms of stiffness, resistance and ductility supply by hierarchically controlling the behaviour of the single joint components. Furthermore, the results of tested joints (classical and innovative) are compared in terms of hysteretic behaviour and energy dissipation supply in order to point out the advantages of the different connecting systems
Cyclic Behavior and Modeling of a Dissipative Connector for CrossLaminated Timber Panel Buildings
No full textThis article aims to propose an innovative type of angle to be used in substitution of the hold-down in cross-laminated timber (CLT) panel buildings. The new connection, called XL-stub, applies a concept similar to the classical ADAS (added stiffness and damping) device. In order to characterize the force-displacement response under cyclic loads of the proposed XL-stub, an experimental campaign is presented. Successively, the effectiveness of the proposed angle is proved by analyzing the non–linear response under seismic loads of a single wall alternatively equipped with hold-downs or the XL-stub
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