Posts Tagged Structure
Inertial Forces in a Structure
Posted by Architect in Earthquake Engineering on June 15, 2010
An earthquake causes shaking of ground. So a building resting on it will experience motion at its base. From Newton’s first law of motion, even though the base of the building moves with the ground, the roof has a tendency to stay in its original position. But since the walls and columns are connected to it, they drag the roof along with them.
Inertial Forces in a Structure
This is much like the situation that you are faced with when the bus you are standing in suddenly starts, your feet move with the bus, but your upper body tends to stay back making you fall backwards!
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Horizontal and Vertical Shaking of a Structure
Posted by Architect in Earthquake Engineering on June 15, 2010
Earthquake cause shaking of ground in all three directions – along the two horizontal directions (X and Y, say), and the vertical direction (Z, say). Also during the earthquake, the ground shakes randomly back and forth (- and +) along each of this X, Y and Z directions.
Horizontal and Vertical Shaking
Flow of Inertia Forces to Foundations
Posted by Architect in Earthquake Engineering on June 15, 2010
Flow of Inertia Forces to Foundation
Under horizontal shaking of ground, horizontal inertia forces are generated at a level of the mass of the structure (usually situated at the floor levels). These lateral inertia forces are transferred by the floor slab to the walls or the columns, to the foundations, and finally to the soil system underneath. So, each of this structural elements (floor slabs, walls, columns, and foundations) and the connections between them must be designed to safely transfer these inertia forces through them.
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