ASEP Continuing Education Summit 2012 invites you to a lecture on:
What: CEL-04: Design
of Structural Steel Members using LRFD
When: June 9, 2012
Time: 11:00 – 12:30
Where: La Breza
Hotel, QC
Who: Resource
Speaker – Alfredo B. Juinio, Jr., F.ASEP
About the Lecture:
The main objective of structural engineering
design is to produce a safe and economical structure that will serve its
intended purpose. Safety in this context
is primarily provided by ensuring that the structure’s strength is sufficient
to resist the maximum load actions that may act during the life of the structure. However, the determination of
strength of the structure and values of the loads are at best only
estimates. Because of uncertainties in
the strength and load actions, design specifications generally prescribe a
generally accepted design methodology to ensure that the probability of the
strength being less than the load actions is small.
Historically, the Working Stress Design
Method (WSD) was the most prevalent. In
the past few decades, this has been supplanted by the Load and Resistance
Factor Design (LRFD) Method. In the
current National Code of the Philippines (NSCP 2010 Volume I, Buildings, Towers
and other Vertical Structures, 6th Edition), the provisions of the
2005 specifications of the American Institute of Steel Construction, Inc (AISC)
were adopted for Chapter 5 on Structural Steel.
These specifications prescribe the use of the LRFD and the Allowable
Strength Design (ASD) Methods.
The lecture will cover discussions on
uncertainties in the determination of strengths and load actions, margin of
safety, load factors and load combinations, strength reduction factors, and the
concept of limit states. Limit states
are conditions beyond which the structure or structural component ceases to
fulfill its intended function. Aside
from the use of partial factors for loads and strength, as opposed to a single
factor of safety in the WSD, the adoption of the limit state design philosophy
into the LRFD is probably the most important improvement of the LRFD. A qualitative overview of the limit states
and codal provisions for structural steel members in tension, compression and
flexure shall also be presented.
About the Lecturer:
Alfredo B. Juinio Jr., FASEP, is a Professor, Institute of Civil Engineering of the University of the
Philippines Diliman.
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