ASHRAE Journal - September 2022 - 52
BUILDING SCIENCES
COLUMN
Joseph W. Lstiburek
I Feel the Earth Move Under My Feet*
Carole King Does
Foundations
BY JOSEPH W. LSTIBUREK, PH.D., P.ENG., FELLOW ASHRAE
To state the obvious, earthquakes are a major threat to the structural integrity of
homes. New and existing homes need to be connected to foundations to withstand
seismic activity. Structural engineers have this pretty much figured out. The following
discussion is not intended to address the structural engineering issues beyond a
superficial manner. The intent is to add water management and thermal management
to the structural engineering. The structural engineering has precedence-it
has priority. I have said many, many times that when I make a mistake, someone gets
wet-boo-hoo. When a structural engineer makes a mistake, someone can die.†
The water management and thermal management
should be complementary to the seismic design
approach and seismic retrofit approach rather than be
incompatible.
One key to earthquake resistance is to control and transfer
lateral loads ( " sheer " ) caused by ground movement to
foundations and the ground. This typically involves:
* Providing wall-to-floor diaphragm anchors;
* Providing floor diaphragm-to-foundation anchors;
* Providing building bracing.
*The song does not have anything to do with earthquakes. The
phrase originally comes from Ernest Hemingway and his 1940
work " For Whom the Bell Tolls. " I am pretty sure when structural
engineers look at foundations done correctly they " feel their heart
start to tremble. "
†Consult a licensed engineer to develop the detailed approach for
homes to withstand seismic activity. The seismic design can occur
in conjunction with water management and thermal management
where the approaches are complementary rather than incompatible.
52
ASHRAE
JOURNAL ashrae.o rg
S E PTEM B E R 2022
The basis of water management and thermal management
is to provide environmental separation:
* Install a water control layer (rain and groundwater);
* Install an air control layer;
* Install a vapor control layer; and
* Install a thermal control layer.
Seismic Design Approach
The significant damage to buildings during earthquakes
is caused by lateral movements. These lateral
loads ( " sheer " ) due to ground movement need to be
transferred to the ground. We are going to focus on
building-to-foundation connections.
Building-to-Foundation Connection
Figure 1 illustrates three foundation types typically found
Joseph W. Lstiburek, Ph.D., P.Eng., is a principal of Building Science Corporation in
Westford, Mass. Visit www.buildingscience.com.
http://www.buildingscience.com
https://ashrae.org/
ASHRAE Journal - September 2022
Table of Contents for the Digital Edition of ASHRAE Journal - September 2022
Contents
ASHRAE Journal - September 2022 - Intro
ASHRAE Journal - September 2022 - Cover1
ASHRAE Journal - September 2022 - Cover2
ASHRAE Journal - September 2022 - 1
ASHRAE Journal - September 2022 - Contents
ASHRAE Journal - September 2022 - 3
ASHRAE Journal - September 2022 - 4
ASHRAE Journal - September 2022 - 5
ASHRAE Journal - September 2022 - 6
ASHRAE Journal - September 2022 - 7
ASHRAE Journal - September 2022 - 8
ASHRAE Journal - September 2022 - 9
ASHRAE Journal - September 2022 - 10
ASHRAE Journal - September 2022 - 11
ASHRAE Journal - September 2022 - 12
ASHRAE Journal - September 2022 - 13
ASHRAE Journal - September 2022 - 14
ASHRAE Journal - September 2022 - 15
ASHRAE Journal - September 2022 - 16
ASHRAE Journal - September 2022 - 17
ASHRAE Journal - September 2022 - 18
ASHRAE Journal - September 2022 - 19
ASHRAE Journal - September 2022 - 20
ASHRAE Journal - September 2022 - 21
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ASHRAE Journal - September 2022 - Cover3
ASHRAE Journal - September 2022 - Cover4
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