Barbara Pfeffer

Bio: Barbara Pfeffer is an academic researcher. The author has contributed to research in topics: Seismic analysis & Work (physics). The author has an hindex of 1, co-authored 1 publications receiving 304 citations.

Seismic Design Of Reinforced Concrete And Masonry Buildings

Abstract: Thank you very much for downloading seismic design of reinforced concrete and masonry buildings. As you may know, people have look hundreds times for their chosen novels like this seismic design of reinforced concrete and masonry buildings, but end up in harmful downloads. Rather than reading a good book with a cup of coffee in the afternoon, instead they cope with some infectious virus inside their laptop.

dignity of work

Abstract: This seminal text demystifies the terminology of working in the fashion industry today, providing definitions of processes, techniques, features, and even some historical terms that you need to know. The dictionary now includes coverage of sustainability, smart materials, new technologies and processes. This book has been reorganized in a purely alphabetical order for easy reference. Lavishly illustrated with over 800 illustrations capturing the styles and details of fashion, this reference work is a must have for students, designers, fashion merchandisers, historians, and fashion enthusiasts.

Understanding Poor Seismic Performance of Concrete Walls and Design Implications

Abstract: The 2010–2011 Canterbury earthquakes in New Zealand revealed (1) improved structural response resulting from historical design advancements, (2) poor structural performance due to previously identi...

Seismic Fragility Assessment of Concrete Bridge Pier Reinforced with Superelastic Shape Memory Alloy

Abstract: In an attempt to reduce permanent displacement and damage, a hybrid reinforced concrete (RC) bridge pier configuration is considered in the present study. The plastic hinge region of the bridge pie...

Advances in theory of plastic mechanism control: closed form solution for MR‐Frames

Abstract: Summary In this paper new advances in the application of ‘Theory of Plastic Mechanism Control’ (TPMC) are presented. TPMC is aimed at the design of structures assuring a collapse mechanism of global type. The theory has been developed in the nineties with reference to moment-resisting frames (MRFs) and progressively extended to all the main structural typologies commonly adopted as seismic-resistant structural systems. In particular, the outcome of the theory is the sum of the plastic moments of the columns required, at each storey, to prevent undesired failure modes, i.e. partial mechanisms and soft-storey mechanisms. The theory is used to provide the design conditions to be satisfied, in the form of a set of inequalities where the unknowns are constituted by the column plastic moments. This set of inequalities was originally solved by means of an algorithm requiring an iterative procedure. The advances presented in this paper are constituted by the identification of a ‘closed form solution’ and by the use of TPMC in a more systematic design approach. This result is very important, because the practical application of TPMC can now be carried out even with very simple hand calculations. The practical application of TPMC is herein presented with reference to the design of a multi-storey frame whose pattern of yielding is validated by means of both push-over analysis and incremental dynamic analyses. Copyright © 2014 John Wiley & Sons, Ltd.

Seismic resilience of concrete structures under corrosion

Abstract: Summary A probabilistic approach to lifetime assessment of seismic resilience of deteriorating concrete structures is presented. The effects of environmental damage on the seismic performance are evaluated by means of a methodology for lifetime assessment of concrete structures in aggressive environment under uncertainty. The time-variant seismic capacity associated with different limit states, from damage limitation up to collapse, is assumed as functionality indicator. The role of the deterioration process on seismic resilience is then investigated over the structural lifetime by evaluating the post-event residual functionality and recovery of the deteriorating system as a function of the time of occurrence of the seismic event. The proposed approach is applied to a three-story concrete frame building and a four-span continuous concrete bridge under corrosion. The results show the combined effects of structural deterioration and seismic damage on the time-variant system functionality and resilience and indicate the importance of a multi-hazard life-cycle-oriented approach to seismic design of resilient structure and infrastructure systems. Copyright © 2015 John Wiley & Sons, Ltd.

Seismic reliability-based ductility demand evaluation for inelastic base-isolated structures with friction pendulum devices

Abstract: The aim of this work is to propose seismic reliability-based relationships between the strength reduction factors and the displacement ductility demand of nonlinear structural systems equipped with friction pendulum isolators (FPS) depending on the structural properties. The isolated structures are described by employing an equivalent 2dof model characterized by a perfectly elastoplastic rule to account for the inelastic response of the superstructure, whereas, the FPS behavior is described by a velocity-dependent model. An extensive parametric study is carried out encompassing a wide range of elastic and inelastic building properties, different seismic intensity levels and considering the friction coefficient as a random variable. Defined a set of natural seismic records and scaled to the seismic intensity corresponding to life safety limit state for L'Aquila site (Italy) according to NTC08, the inelastic characteristics of the superstructures are designed as the ratio between the average elastic responses and increasing strength reduction factors. Incremental dynamic analyses (IDAs) are developed to evaluate the seismic fragility curves of both the inelastic superstructure and the isolation level assuming different values of the corresponding limit states. Integrating the fragility curves with the seismic hazard curves related to L'Aquila site (Italy), the reliability curves of the equivalent inelastic base-isolated structural systems, with a design life of 50 years, are derived proposing seismic reliability-based regression expressions between the displacement ductility demand and the strength reduction factors for the superstructure as well as seismic reliability-based design (SRBD) abacuses useful to define the FPS properties.