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SUMMARY:Unbonded post-tensioned shear walls as low-damage structural syste
 m
DTSTART:20190107T113000
DTEND:20190107T121500
DTSTAMP:20260929T041132Z
UID:31fb40d6070dba62dfd3c316c04a59ea0cec7d95a17afe25115d97a7
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Dr. Pedro Silva (George Washington University)\nThe rese
 arch project discussed in this seminar proposes to address a grand challen
 ge in structural engineering\, which is the development of structural syst
 ems for use in resisting extreme hazards with minimum or no damage. Addres
 sing this challenge will result in the design of the built infrastructure 
 and in specific buildings that meet performance metrics towards achieving 
 immediate occupancy and minimum economic losses after an extreme event\, s
 uch as earthquakes. In past decades\, research on un-bonded post-tensioned
  (UBPT) shear walls as lateral load resisting systems has certainly proven
  effective in achieving this goal\, yet the following technical issues per
 sist: concrete crushing at the wall toes\, yielding of tendons\, wall walk
 ing\, and energy dissipation from ductile connectors that must be replaced
  and can lead to permanent deformations after an extreme hazard. This rese
 arch proposes a transformative structural wall system for buildings that w
 hile performing damage free when resisting lateral loads surpasses many of
  the limiting issues still prevalent in UBPT systems. While similar to UBP
 T\, in the system currently under investigation\, the shear wall footing i
 nterface consists of a curved surface. This profile allows the wall to sli
 de along the bottom-curved surface without separation from the foundation\
 , and lateral deformations are accommodated through a pendulum-type motion
 . According to this system\, lateral resistance is achieved by a combined 
 friction mechanism along the curved surface and the vertical UBPT cables. 
 The post-tensioning cables also assist in restoring the system to its init
 ial configuration. The result is a technology related to the design of dam
 age-free structural systems\, and a new way of thinking about leveraging s
 ystem geometry and deformations for enhanced resilient and sustainable des
 ign of buildings. This research will promote new design concepts that harn
 ess deformations for optimal performance rather than performance objective
 s set to target material limit states. In this seminar\, preliminary outco
 mes of the research are discussed that set towards a new design philosophy
  envisioned to be unrestricted by traditional material failure limit state
 s.\n\nBio: Dr. Pedro Silva is an Associate Professor in the Department of 
 Civil and Environmental Engineering at the George Washington University. H
 is main research interests are the development of innovative procedures fo
 r the design of civil structures to resist man made as well as natural haz
 ards. Dr. Silva has over 20 years of experience in the design and experime
 ntation of large-scale projects targeted an investigating new/retrofit des
 ign concepts for bridge and building structures. Dr. Silva is a voting mem
 ber of the ACI Committees 440\, where he developed specification language 
 for the ACI 440-2 Chapter on Seismic Strengthening.  Currently\, this is 
 the first code of practice worldwide for the design of Seismic Strengtheni
 ng of Concrete Buildings Using FRP Composites. Currently Dr. Silva researc
 h group completed the development of numerical tools for practitioners and
  researchers to use in the assessment/design of reinforced concrete (RC) s
 lender bridge columns using new state of the art seismic design practice. 
 Products of this research include new models for plastic hinge length rela
 tions and numerical procedures used in defining stability indexes that: (1
 ) stipulate threshold limits for neglecting P-D effects\, and (2) define a
  collapse-prevention criterion.
LOCATION:GC C2 413 https://plan.epfl.ch/?room=GCC2413
STATUS:CONFIRMED
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