Differential Settlement of two adjacent structures
Differential Settlement of two adjacent structures
(OP)
As per the enclosed sketch
I am working on steel moment frame structure resting on clay soil attached attached to concrete tower resting on rock
Both structures will be based on shallow isolated footing with no tie beams.
The soil report provided allowable bearing to be 125 kpa
The report mentioned that the maximum differential settlement under the maximum allowable pressure is expected to be 25mm with is within the limits of angular deflection limit as per the code.
I have also calculated the maximum separation joint based on lateral load analysis for the two structures to be 1" As per NBCC seismic separation requirement.
I am also considering to size the footing to have approximate nearby bearing pressure between interior and perimeter footings.
I am concerned to hear you opinions and thoughts on this case as it is new to me, Also is there any precautions I should be looking into?
Thank you,
I am working on steel moment frame structure resting on clay soil attached attached to concrete tower resting on rock
Both structures will be based on shallow isolated footing with no tie beams.
The soil report provided allowable bearing to be 125 kpa
The report mentioned that the maximum differential settlement under the maximum allowable pressure is expected to be 25mm with is within the limits of angular deflection limit as per the code.
I have also calculated the maximum separation joint based on lateral load analysis for the two structures to be 1" As per NBCC seismic separation requirement.
I am also considering to size the footing to have approximate nearby bearing pressure between interior and perimeter footings.
I am concerned to hear you opinions and thoughts on this case as it is new to me, Also is there any precautions I should be looking into?
Thank you,






RE: Differential Settlement of two adjacent structures
An old paper by BK Hough provided relationships between N value and some of the values used for these settlement analyses.
ASCE SM 4, # "Compressibilit5y as the Basis for Soil Bearing Value". August 1959 His value C=1+e/Cc called Bearing Capacity Index
RE: Differential Settlement of two adjacent structures
why is this case specific load calculation would be needed if the footings have similar pressure
Generally in clay the increase of least width of footing will decrease the bearing capacity?
As the report mention maximum least width to be 6 m and beyond that the bearing capacity will be reduced and geotech should be consulted
RE: Differential Settlement of two adjacent structures
RE: Differential Settlement of two adjacent structures
Is there any other consideration in this case I should account for ?