Behaviour of one-bay frame with strip foundation (under seismic loads)
During an earthquake, loading on one edge is higher thus creating higher soil stresses while at the same time the other edge is relieved. When the seismic forces shift direction the footings’ loading switches symmetrically. The deformations and stresses applied to the strip foundation are high and continuously alternating.
The footing behaves like a bilateral cantilever (fixed upon the strip foundation’s web). Its behaviour is similar to the behaviour of the spread footings therefore it requires reinforcement at its lower fiber, as shown at the figure below.
During an earthquake, loading on one edge is higher thus creating higher soil stresses while at the same time the other edge is relieved. When the seismic forces shift direction the footings’ loading switches symmetrically. The deformations and stresses applied to the strip foundation are high and continuously alternating.
The footing behaves like a bilateral cantilever (fixed upon the strip foundation’s web). Its behaviour is similar to the behaviour of the spread footings therefore it requires reinforcement at its lower fiber, as shown at the figure below.
The soil’s
reaction, loads the footing slab (the inverted T-beam’s flange) in an
upward direction. This causes deformations at the lower surface of the
footing which are carried by the reinforcement.
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