Elastic behavior is caused by applied loads, whereas plastic behavior can occur both below and above yield stresse rate of creep is determined by the concrete's composition as well as the surrounding factors.
Concrete multi-story buildings, like steel multi-story buildings, can be made out of portal frames, braced frames, or diaphragms with concrete core walls for lateral stability.
However, lateral stability has numerous requirements for multi-story buildings:
- When constructing floors with in-situ reinforced concrete, stiff horizontal diaphragms must be used with core walls. Lift shafts or the surrounding walls of stairs can have concrete core walls (with a minimum thickness of 200mm for steel reinforcement placement and concreting).
- Unless transfer structures are used, bracing should be used throughout the height of the building.
The shear center should be located where the resultant of overturning forces is located.
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