Once expansion joint locations and sizes have been

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Once expansion joint locations and sizes have been determined, accommodations must be made for the move- ment. Basically, there are two ways to accommodate movement. One way is to provide support members such as columns on both sides of the expansion joint as shown in Figure 16. In essence, the structure on each side of the expansion joint is treated as a separate structure, free to move independently of the other side. The other approach is to make provisions for movement by allowing some of the structure to slide relative to the other while still supported on a common support. This is typically accomplished by creating a seated slide-bearing detail that is supported directly on either a column or a beam as shown in Figure 17. This alternate type of expansion joint is generally used when double columns cannot be accommodated, or where double columns in an exposed posi- tion of the building would be undesirable. Regardless of what type expansion/contraction system is used, it cannot be overemphasized that freedom of movement must be incorporated throughout all of the building systems. Again provisions must be made for all components that cross the expansion joint. EXPANSION CONTRACTION CONTRACTION EXPANSION 200 feet 200 feet 200 feet EXPANSION CONTRACTION MOVEMENT JOINTS Figure 15. Diagram of building expansion example 200 ft 200 ft 200 ft EXPANSION EXPANSION EXPANSION CONTRACTION CONTRACTION CONTRACTION MOVEMENT JOINTS
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PAGE 19 SYSTEMS Figure 16. Double-column movement connection Figure 17. Seated slide-bearing connection Movement Joint Completely separate structures able to move independently of each other. Columns may share common footing. Connection with long horizontal slots and finger tight bolts. Seated connection with slide bearing pad and finger tight bolts. Beam Stiffener Movement Joint
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SYSTEMS PAGE 20 FLOOR VIBRATION Movement of floors caused by occupant activities can present a serious serviceability problem if not properly con- sidered and prevented by the design of the structural system. Humans are very sensitive vibration sensors - verti- cal floor movement of as little as forty thousandths of an inch can be very annoying. Post-construction repairs of floors that vibrate are always very expensive, and sometimes cannot be done because of occupancy limitations. This reinforces the necessity of addressing potential vibration problems in the original design. The response of individuals to floor motion depends on the environment, occupant age, and location. People are more sensitive in quiet environments, such as a residence or quiet office, as compared to a busy shopping mall. The elderly are more sensitive than young adults, and sensitivity appears to increase when sitting as com- pared to standing or reclining.
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  • Fall '19
  • Structural steel

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