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Performance Based Seismic Design of Skyscrapers
Presentation · June 2019
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Ahmed A. Abdou El-Abbasy
Jazan University
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Performance Based Seismic
Design of Skyscrapers
Ahmed El-Abbasy
Professor and Consultant of Concrete Structures
Jazan University
Egypt’s First Skyscraper Conference
19 -20 June 2019
Performance Based Seismic Design
• Conjunction of the design, construction and
maintenance procedures necessary to reach,
through engineering means, predictable
performances for multiple design objectives.
• Its purpose is to minimize the economic losses
after a seismic event during the useful life of the
structures.
Performance Based Seismic Design
• Is it really new? NO
• Is it really good? YES
Evolution of Tall Buildings in the Western Unites States
► The moment distribution method is a
structural analysis method for statically
indeterminate beams and frames developed
by Hardy Cross. It was published in 1930
in an ASCE journal. From the 1930s until
computers began to be widely used in the
design and analysis of structures, the
moment distribution method was the most
widely practiced method.
Construction Statistics in United States
Then, skyscrapers are a fraction of the total constructions in USA
Background
• PBSD is not a new concept, however, with the
current procedures of seismic design it is not
possible to guarantee that the objectives of the
design philosophy are satisfied.
• The application of the PBSD implies the use of
methods and tools which emphasize a precise
characterization of the structures and lead to
predictions using a level of technology higher than
that currently used.
• The Computational Mechanics group of the Institute
of Engineering at UNAM has developed various
procedures for the evaluation and design of
structures using the philosophy of PBSD.
Needs
• Procedures for the PBSD of structures validated
with realistic performance indexes which
guarantee for a given design level a better
control of the performance objectives.
• Till now the design philosophy and the theoretical
basis which regulate the PBSD of structure have
been established. However, more work on the
development of the procedures to implement the
PBSD is required.
Performance Based Seismic Design
Seismic performance level.
Expression the maximum acceptable damage in a structure
subjected to earthquake action.
Seismic design level.
Seismic demand representing the hazard of a site where
the structure would be located.
Seismic design objectives.
Union of a performance level and a level of seismic design.
Performance Level
Fully Collapse
Life safety
operational Operational prevention
Seismic Design Level Frequent (43 years)
50% in 30 years
Ocassional (72 years)
50% in 50 years
Rare (475 years)
10% in 50 years
Very Rare (970 years)
10% en 100 years
Tall Buildings Guidelines
SEA Los Angeles Region TBI
TBI Tall Buildings Initiative
TBI is the most popular guidelines for Performance-Based Seismic Design
of Tall Buildings all over the world
Definition of Performance-Based Engineering
Design for the achievement of specified results rather than
adherence to particular technologies or prescribed means.
Performance Objectives
K and p are the
most commonly
selected
performance
objectives
Performance Objectives
IO: Immediate Occupancy
LS: Life Safety
CP: Collapse Prevention
Performance Objectives
Acceptance Criteria Component Tests
PBD was used, first, for seismic rehabilitation
Then, PBD was used for design of new buildings
In PBD procedure, nonlinear analysis must be performed
Serviceability Code level design
Check with exceptions
Stability Check
• Durability, moisture and fire resistance
indicate.
f = resistance factor by ACI or AISC
exceed the expected strength
Thank you
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