1,847,931 research outputs found
Modelling delay and noise in arbitrarily coupled RC trees.
No full textClosed-form equations for second-order transfer functions of general arbitrarily coupled resistance-capacitance (RC) trees with multiple drivers are reported. The models allow precise delay and noise calculations for systems of coupled interconnects with guaranteed stability and represent the minimum complexity associated with this class of circuits. Their accuracy is extensively compared against other relevant models and is found to be better or comparable to more expensive models. All results are derived from a theoretical approach, and their physical basis is examined. The simplicity, accuracy, and generality of the models make them suitable for use in early signal integrity analyses of complex systems and incremental physical optimization
Behavior of RC beams patch repaired and strengthened with FRP composites : a numerical study
No full textIncludes bibliographical references.Reinforced concrete (RC) beams get deteriorated and become deficient mainly due to corrosion of steel reinforcements, poor maintenance and design, earthquakes and aging. Patch repair and structural strengthening using fiber reinforced polymers (FRP) have been increasingly adopted all over the world as an economical solution to upgrade the load carrying capacity of such beams. However, the failure modes of such repaired and strengthened RC beams are governed by brittle and sudden premature debonding which involves separation of external reinforcement; i.e. FRP and RC beam. Different researchers have used different approaches including experimental, analytical and numerical to investigate the behavior of patch repaired and FRP strengthened RC beams. It is noteworthy that there are no such numerical studies that investigated the effect of patch repair. In this study, a numerical investigation was carried out using the commercial finite elements analysis software ABAQUS with the aim of investigating the overall behavior of RC beams patch repaired and strengthened with FRP plates including the failure mechanisms
Seismic retrofitting of RC frames with RC infilling (SERFIN Project)
No full textThe effectiveness of seismic retrofitting of multi-storey multi-bay RC-frame buildings by converting selected bays into new walls through infilling with reinforced concrete (RC) was studied experimentally at the ELSA facility of the Joint Research Centre in Ispra (Italy). A fullscale model was tested with the pseudo-dynamic method and consisted of two four-storey (12m tall) three-bay (8.5 m long) parallel frames linked through 0.15 m slabs with the central bay (2.5 m) infilled with a RC wall. The frames were designed and detailed for gravity loads only and are typical of similar frames built in Cyprus in the 1970’s
Cyclic response of RC beam-column joints reinforced with plain bars: an experimental testing campaign
No full textExisting reinforced concrete (RC) buildings constructed until the mid-70’s, with plain reinforcing bars, are expected to behave poorly when subjected to earthquake actions. This paper describes an experimental program designed to investigate the influence of poor detailing on the cyclic behaviour of RC beam-column joint elements.
Cyclic tests were performed on five interior and five exterior full-scale beam-column joints with different detailing characteristics and reinforced with plain bars. An additional joint of each type was built with deformed bars for an evaluation of the influence of bond properties on the cyclic response of the structural element. The force-displacement global response, energy dissipation, equivalent damping and damage behaviour of the joints was investigated and the main results are presented and discussed. The experimental results indicate that the bond-slip mechanism has significantly influenced the cyclic response of the beam-column joints. The specimens built with plain bars showed lower energy dissipation, stiffness and equivalent damping
Closed form metrics to accurately model the response in general arbitrarily-coupled RC trees.
No full textClosed form expressions are presented for the first and second moment of the impulse response for arbitrarily-coupled RC trees with multiple drivers, and used to generate accurate second order estimations of the transfer function from any driver to the receiver. The superposition of the waveforms for all switching events allows precise delay and noise calculations for systems of coupled interconnects with different aggressor arrival times, with a minimum of computational complexity
Demo 18-28 RC Charging Curve
No full textWhen a resistor R and a capacitor C are connected in series across a voltage source the capacitor charges with a characteristic time called the time constant t, where t = RC. The time constant is shown for several values of R and C using an oscilloscope connected across the capacitor, using the RC board shown in Figure 1
Energy dissipation and equivalent damping of RC columns subjected to biaxial bending: an investigation based in experimental results
No full textThe cyclic behaviour of reinforced concrete columns have been object of many experimental studies in the
recent past years. However, the experimental studies on the biaxial response of RC columns are still limited. In
this paper are presented the main results of an experimental study of 24 full-scale rectangular building columns
tested for different loading paths under uniaxial and biaxial conditions. The experimental results are presented
and discussed in terms of global behaviour, particularly focusing on the stiffness and strength degradation due to
the increasing cyclic demand, and energy dissipation evolution. The equivalent viscous damping was estimated
based on the experimental results of the RC columns tested under biaxial loading and empirical expressions are proposed
Virtual-Platform-RC-FIAP
No full textThe virtual platform RC-FIAP is developed (initially focused on RC frames) to conceive and automatically analyze, design, and construct an inelastic model to perform non-linear static- and dynamic analysis. The core of the platform is OpenSeesPy, which extends the known capabilities of the OpenSees engine, by coupling it with Python, a language of simple programming structure, including graphical interface
- …
