Calculating and designing Lateral Force Resistance Systems (LFRS) for Wind and Earthquake Forces in Light Frame Construction
George E. Thomas, PE
Course Outline
This course provides
methods for evaluating the lateral resistance of individual subassemblies of
the LFRS (i.e., shear walls and diaphragms) and the response of the whole building
to lateral loads (i.e., load distribution). Traditional design approaches as
well as innovative methods, such as the perforated shear wall design method,
are integrated within this course. While the code approved methods have generally
"worked," there is considerable opportunity for improvement and optimization.
The information and design examples presented at the end of this course provide
a useful guide and resource that supplement existing building code provisions.
Also, this course fosters a better understanding of the role of analysis versus
judgment and in promoting a more efficient design.
This course includes
a multiple choice quiz at the end, which
is designed to enhance the understanding of the course materials.
Learning Objective
At
the conclusion of this course, the student will:
- Gain an understanding
of Lateral Force Resistance Systems (LFRS);
- Have an understanding
of LFRS design steps and terminology;
- Know how to
apply the design of shear walls and diaphragms in light frame construction;
- The importance
of providing the proper design in LFRS;
- How hold down
restraints react to various loads;
- How to provide
adequate sizing to LFRS components used in light frame construction;
- How building
characteristic's effect the design of shear walls in light frame constructed;
- How to apply
adjustment factors to framing members and components;
- How to evaluate
overturning forces in a shear wall;
- Have an understanding
of load combinations for light frame construction;
- Have an understanding
of shear wall stiffness and drift;
- Have an understanding
of shear transfer in LFRS;
- Have an understanding
of overturning restraints of shear walls;
- Have an understanding
of unit shear values in wood structural panels, Portland cement stucco, gypsum
wallboard, and other materials;
- Have an understanding
of wood let-in braces and metal-braces for light frame construction;
- Have an understanding
of whole house approach in LFRS design;
- How to provide
adjustment factors to LFRS design values;
- How various
equations are applied to determine LFRS,
- How to deal
with components when considering LFRS;
- How to deal
with variation in materials in lateral force resistance systems;
- Identify structural
elements of a shear wall;
- Identify structural
elements of a shear wall collector;
- Identify structural
elements of a Horizontal Diaphragm; and
- Increase an
understanding of hold-down restraint and their basic analytic concepts.
Intended
Audience
Architects, Engineers,
Residential Designers, and Builders
Benefit to Attendees
The information
gained from this course will allow for the engineer to design Lateral Force
Resistance Systems (LFRS) to wind and earthquake forces for light frame construction
and residential structures.
Course
Introduction
This course
will address the design of wood structural systems and construction materials
commonly used in Lateral Force Resistance Systems (LFRS). The course focuses
on structural design that specifies standard dimension lumber and structural
wood panels (i.e., plywood and oriented strand board sheathing, etc.). Design
of the lateral force resisting system (i.e., shearwalls and diaphragms) is approached
from a system design perspective. Many elements of light frame construction
work together as a system to resist lateral and axial forces imposed on the
above-grade structure and transfer them to the foundation. Within the context
of simple engineering approaches familiar to engineers, system-based design
principles are addressed in this course.
Course Content
In this lesson, you are required to download
and study the following course content in PDF format:
Calculating
and designing Lateral Force Resistance Systems (LFRS) for Wind and Earthquake
Forces in Light Frame Construction
Please click on
the above underlined hypertext to view, download or print the document for your
study. Because of the large file size, we recommend that you first save the
file to your computer by right clicking the mouse and choosing "Save Target
As ...", and then open the file in Adobe Acrobat Reader. If you still experience
any difficulty in downloading or opening this file, you may need to close some
applications or reboot your computer to free up some memory.
Course Summary
In summary this
course was developed to help facilitate and advance efficient design of Lateral
Force Resistance Systems (LFRS)used in light frame construction and residential
housing whether built in conformance with prescriptive (i.e., "conventional")
practices or specially engineered in part or whole. The desired effect of the
information presented is to continue to improve the value of engineers in terms
of economy in construction and performance.
Quiz
Once
you finish studying the
above course content,
you need to
take a quiz
to obtain the PDH credits.
DISCLAIMER: The materials
contained in the online course are not intended as a representation or warranty
on the part of PDH Center or any other person/organization named herein. The materials
are for general information only. They are not a substitute for competent professional
advice. Application of this information to a specific project should be reviewed
by a registered architect and/or professional engineer/surveyor. Anyone making
use of the information set forth herein does so at their own risk and assumes
any and all resulting liability arising therefrom.