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8/20/2019 Lec01-02 - Structural System for Buildings
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STRUCTURAL SYSTEMS
FOR BUILDINGS
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Structure of a Building
The primary function of abuilding structure is to supportand transmit the building loadsand forces to the ground.
Photos courtesy Tilt-up Concrete Association
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System DescriptionA Framed Building is a structure whose weight is carried by the framework
instead of by load-bearing walls. The term includes modern metal and
reinforced concrete structures as well as timber-framed buildings.
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Characteristics of a Structure
• Strength
• Stability
• Economic Value
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Types of Structural Systems
•
• Load bearing structures
• Partial load bearing structures• Frame Structures
• Truss Frame Structures
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Structural Sub-System
• Made up of many smaller structural sub-systems that
work together to provide a strong, stable, and cost-
effective structure.
• Examples of these smaller structural sub-systems include:
o Roof
o
Wallso Floors
o Framing
o
Foundations
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Structural Sub-System
• Made up of many structural elements that work together
to provide a strong, stable, and cost-effective system.
• Basic structural elements include:
o Beam
o Column
o Truss
o Arch
o Dome
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Forces and Loads
• A force is any action that causes a change in the shape or
motion of an object.
• A load is a force that is supported by a structural element.
• The terms force and load are often used interchangeably.
SNOWWIND
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External forces or Loads
External forces or loads on a structures are determined after
finding the structural dimensions.
The loads define the type of structure to be constructed.
Once the structural form has been decided, the actual
design begins.
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Loads
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The design of structure starts with those
elements which are subjected first to the
primary loads.
For example, first the slabs are designed
then beams, then columns and then footing.
External Forces / Loads are specified in:
• General Building Codes
• Design Codes
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Types of Loads
• Dead Loads
• Live Loads
• Snow Loads
• Bridge Loads
• Wind Loads
• Earthquake Loads
• Hydrostatic and Soil Pressure
• Other Natural Loads
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Loads
Loads
Static LoadsDynamic
Loads
Loads
Dead Live
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Difference of
DYNAMIC ANALYSIS & NONLINEAR
ANALYSIS
Static Linear Analysis
Static Nonlinear Analysis
Dynamic Linear AnalysisDynamic Nonlinear Analysis
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Transmission of Loads
Gravity load resisting system
Lateral load resisting system
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Loads to Consider
• Dead Loads:
“Dead loads consist of the weights of the various
structural members and the weights of any objects that
are permanently attached to the structure.” (Hibbeler)
• Live Loads:
– Wind Loads
– Snow Loads
– Earthquake Loads – Other Loads:
• Blast Loads
• Variance in temperatures
• Uneven settling of soil
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Beam Columns
A structural member that is subjected to axial
compression and bending at the same time.
The moment is
subjected to column
from beams so it istermed as beam
column
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How can we identify supports and design them instructure?
Hinge supportRoller supportFix support(refer to board lectures for these topics)
Refer to board lecture
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3. Overview Structural Systems
A. Truss
B. Beam&Column, Rigid
Frame
C. Bearing wall
D. Floor Systems
E. Lateral Load Systems
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A. Truss
•Plane Truss
•Space Truss
2-D
3-D
Hinge joint
Comp.
Tens.
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B. Beam&Column
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Column
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C. Wall Bearing
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D. Floor Systems
•What is slab?
•How to consider?
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Factors for Design and Cons.
• Load… LL., DL., FL.
• Span
• Thickness
• Deflection and Vibration• Stiffness
• Methods….