1,721,048 research outputs found
Beam-to-column connections for steel-concrete composite moment resisting frame designed for S Ductility Class
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Identifying the joint mechanical parameters of a steel-concrete composite frame structure in undamaged and damaged states
No full textEnhanced seismic performance of non-standard bolted flange joints for petrochemical piping systems
No full textThis paper presents an experimental test campaign carried out on a number of seismically enhanced Bolted Flange Joints. In particular, two non-standard Bolted Flange Joints, comparatively thinner than standard ones, were designed and their performance was evaluated through several monotonic and cyclic tests. Experimental results exhibited a favourable performance of the examined joints under bending and axial loading and moderate internal pressure; a good capacity in terms of strength, ductility, energy dissipation and leakage was observed. A comparison between experimental results and Code-based design loads proved the usability of the proposed joints during and after OBE ground motions. Finally, a comparison between capacity and seismic demands of these joints adopted in a piping system of a realistic Case Study suggested their suitability for seismic applications as well as some building code deficiency with respect to response modification factor
Seismic behaviour of beam-to-column connections for steel-concrete composite moment resisting frames
No full textModem codes for building in seismic areas allow for designing high-ductility structures, without providing designers, however, detailed specifications or prescriptions for designing and building certain components. On, the other hand, steel-concrete composite structures, owing to their high capacity for prefabrication and rational use of the materials, seem able to provide high levels of performance in terms of ductility and dissipation energy, while at the same time containing construction costs. The present paper illustrates the methods that were adopted in order to design a partial strength beam-to-column joint in view of the construction of high-ductility moment-resisting frames, where inelastic phenomena occur precisely in beam-to-column joints and at the column bases
Soluzioni progettuali per strutture sismoresistenti composte acciaio-calcestruzzo ad elevata duttilità
No full textSeismic Performance of Bolted Flange Joints in Piping Systems for Oil and Gas Industries
No full textRecent seismic events showed a quite high vulnerability of industrial piping systems and components, where
damage ranges from simple failure of joints to failure of supporting structures. The performance of the whole
piping system strictly depends on the functionality of its individual components. Moreover, the behaviour of
bolted joints is complex and critical under seismic actions. Therefore, they need special attention and deep
investigation. In addition even for refinery industries, it is also important to know the leakage behaviour of
typical flanged joints. Currently, both American and European codes are available to design flanged joints under
static loading. Nonetheless, there is no code available to take into account seismic loading effects on these joints.
Along these lines, we intend to present in this paper the results of a test campaign on two different types of
flanged joints carried out at the University of Trento(Italy), by means of bending and axial loading, respectively.
Test results were favourable and were analysed and compared with: 1) the demand provided by piping systems
connected to a typical support structure, 2) allowable, yielding and ultimate design values provided by available
codes
PERFORMANCE-BASED ANALYSIS OF PETROCHEMICAL PIPING SYSTEMS LOCATED IN EARTHQUAKE-PRONE ZONES
No full textPiping systems represent a vital part of energy industries, e.g. petrochemical, oil & gas and chemical
plants, where they are often employed to transport dangerous goods like oil and gas. A single failure in
such systems may cause serious accidents both to the environment and human lives. During past
earthquakes, piping systems and their components suffered significant damages causing severe
consequences, as reported in several publications. Thus, seismic assessment/evaluation of these
structures has become an imperative for their proper design to safeguard them against seismic events.
Nevertheless, there exists an inadequacy of proper seismic analysis and design rules for petrochemical
piping systems, and designers have to follow seismic standards conceived for other structures such as
buildings and nuclear plants. Moreover, the modern performance-based design approach is still not
widely adopted for piping systems, where the allowable design method is the customary practice.
Along these lines, this paper presents a performance-based seismic analysis of petrochemical plants
through two case studies. Initially, main issues on seismic analysis and design of industrial piping
systems and components are addressed followed by a discussion on the selection of proper seismic
inputs. The current allowable stress and strain based seismic verification methods are presented
afterward. Then, nonlinear finite element analyses of two typical petrochemical piping systems under
modern design earthquake levels are presented. Finally, performance of these piping systems is
commented by comparing the maximum stress and strain levels -found from the analyses- with the
allowable design values that exhibited a favourable behaviour of the analysed systems under
earthquake limit state levels
Seismic design of beam-to-column connections for steel-concrete composite moment resisting frames
No full textModeling of the Cyclic Behaviour of Bolted T-stubs subjected to Variable Amplitude Loading
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