The foundations supporting two columns of a building are shown in Figure E9.16. An extensive so investigation was not carried out, and it was assumed in the design of the foundations that the clay lay had a uniform thickness of 1.2 m. Two years after construction the building settled, with a differenti settlement of 10 mm. Walls of the building began to crack. The doors have not jammed, but b measuring the out-of-vertical distance of the doors, it is estimated that they would become jammed the differential settlement exceeded 24 mm. A subsequent soil investigation showed that the thicknes of the clay layer was not uniform but varies, as shown in Figure E9.16. The owners would like to g an estimate of the expected total differential settlement and how long it will take before the doo. become jammed.
The foundations supporting two columns of a building are shown in Figure E9.16. An extensive so investigation was not carried out, and it was assumed in the design of the foundations that the clay lay had a uniform thickness of 1.2 m. Two years after construction the building settled, with a differenti settlement of 10 mm. Walls of the building began to crack. The doors have not jammed, but b measuring the out-of-vertical distance of the doors, it is estimated that they would become jammed the differential settlement exceeded 24 mm. A subsequent soil investigation showed that the thicknes of the clay layer was not uniform but varies, as shown in Figure E9.16. The owners would like to g an estimate of the expected total differential settlement and how long it will take before the doo. become jammed.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:The foundations supporting two columns of a building are shown in Figure E9.16. An extensive soil
investigation was not carried out, and it was assumed in the design of the foundations that the clay layer
had a uniform thickness of 1.2 m. Two years after construction the building settled, with a differential
settlement of 10 mm. Walls of the building began to crack. The doors have not jammed, but by
measuring the out-of-vertical distance of the doors, it is estimated that they would become jammed if
the differential settlement exceeded 24 mm. A subsequent soil investigation showed that the thickness
of the clay layer was not uniform but varies, as shown in Figure E9.16. The owners would like to get
an estimate of the expected total differential settlement and how long it will take before the doors
become jammed.
780 kN|
780 kN
Foundation A
Foundation B
1.5 m x 1.5 m
1.5 m x 1.5 m
Sand.
1.4 m
3 m
2.8 m
1.2 m
Clay, m, = 0.7 m²/MN
Gravel
FIGURE E9.16
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