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RISS 인기검색어
- 검색키워드
- 저자 : Luís Calado (검색결과 3 건)
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Seismic design and assessment of steel-concrete frame structures with welded dissipative fuses
Luís Calado,Jorge M. Proença,João Sio 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.35 No.4
This research presents the design and numerical assessment of composite steel-concrete frame structures with welded dissipative fuses. The assessment has been carried out based on linear response spectrum, nonlinear static pushover and time history procedures. The analytical expressions which define the envelope of the nonlinear response of the dissipative fuses are first presented and calibrated against experimental results available in literature. The assessment is then carried out according to a design methodology proposed herein. Outcomes of the numerical assessment indicate that the use of welded dissipative fuses successfully limited damage within the replaceable parts. Furthermore, although structures with dissipative fuses present lower strength and, generally, lower displacement capacity, their displacement ductility and global dissipative performance are generally higher than conventional structures, especially when the structure with dissipative fuses presents a dissipative configuration adjusted to the bending moment distribution diagram calculated for the applied seismic action.
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Luís Calado,Jorge M. Proenca,Miguel Espinha,Carlo A. Castiglioni 국제구조공학회 2013 Steel and Composite Structures, An International J Vol.14 No.6
In recent years there has been increasing international interest about designing structures thatcost less to repair after they have been subjected to strong earthquakes. Considering this interest, aninnovative repairable fuse device has been developed for dissipative beam-to-column connections inmoment-resisting composite steel and concrete frames. The seismic performance of the device was assessedthrough an extensive experimental program comprising ten cyclic and two monotonic tests. These tests wereconducted on a single beam-to-column specimen with different fuse devices for each test. The devicesvaried in terms of the chosen geometric and mechanical parameters. The tests showed that the devices wereable to concentrate plasticity and to dissipate large amounts of energy through non-linear behavior.Numerical models were developed with Abaqus and simplified design models are also proposed.
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Jorge M. Proença,Luís Calado,Alper Kanyilmaz 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.46 No.2
The article describes the development of a novel dissipative bracing connection device (identified by the acronym DRBrC) for concentrically braced frames in steel and composite structures. The origins of the device trace back to the seminal work of Kelly, Skinner and Heine (1972), and, more directly related, to the PIN-INERD device, overcoming some of its limitations and greatly improving the replaceability characteristics. The connection device is composed of a rigid housing, connected to both the brace and the beam-column connection (or just the column), in which the axial force transfer is achieved by four-point bending of a dissipative pin. The experimental validation stages, presented in detail, consisted of a preliminary testing campaign, resulting in successive improvements of the original device design, followed by a systematic parametric testing campaign. That final campaign was devised to study the influence of the constituent materials (S235 and Stainless Steel, for the pin, and S355 and High Strength Steel, for the housing), of the geometry (four-point bending intermediate spans) and of the loading history (constant amplitude or increasing cyclic alternate). The main conclusions point to the most promising DRBrC device configurations, also presenting some suggestions in terms of the replaceability requirements.
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