stress under raft 2

[swelm]

hello

we have raft foundation it is has stress 25 kg/cm2 for 30% of the whole area the allowable stress under the raft as per soil report is 25kg/cm2 i need to increase the area of the raft
but the structural engineer for the contractor refuse and he ask to take average stress under the raft

he ask to take (max stress+ min stress /2) but i doubt on that

we use ACI and ubc

regards

 

[swelm]

DEAR ENG'R HOKIE66;

sorry for being so late in respond this is the resualt which i get form safe programm.we check the load more than
10 times.

i think the stress is very high because the core at the edge of footing and we have settelment joint beside the core so we can not incease the raft dimenion

thanks for your interesting.