4) The utility has decided to build a transformer pad at the same site as the previous question. The pad is to be 3 m wide by 5 m long, bearing directly at the ground surface with a uniform pressure of 250 kPa. a) Calculate the vertical stress increase at points A (center), B (corner), and C (edge) as shown below (hint: use superposition) to a depth of 15 m. B В - 3 m L-5m b) Calculate the vertical stress increase at point A using the 2:1 approximation given below. Compare the results to those obtained using the more rigorous method. c) Assume the pad to be a strip footing with the same width, and calculate the vertical stress increase at point A. d) From the calculated stress distributions above for both the rectangular and strip footing assumption, at what depth is the distributed stress equal to 10% of the surface pressure?
4) The utility has decided to build a transformer pad at the same site as the previous question. The pad is to be 3 m wide by 5 m long, bearing directly at the ground surface with a uniform pressure of 250 kPa. a) Calculate the vertical stress increase at points A (center), B (corner), and C (edge) as shown below (hint: use superposition) to a depth of 15 m. B В - 3 m L-5m b) Calculate the vertical stress increase at point A using the 2:1 approximation given below. Compare the results to those obtained using the more rigorous method. c) Assume the pad to be a strip footing with the same width, and calculate the vertical stress increase at point A. d) From the calculated stress distributions above for both the rectangular and strip footing assumption, at what depth is the distributed stress equal to 10% of the surface pressure?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
Transcribed Image Text:4) The utility has decided to build a transformer pad at the same site as the previous
question. The pad is to be 3 m wide by 5 m long, bearing directly at the ground surface
with a uniform pressure of 250 kPa.
a) Calculate the vertical stress increase at points A (center), B (corner), and C (edge)
as shown below (hint: use superposition) to a depth of 15 m.
B
В - 3 m
L- 5m
b) Calculate the vertical stress increase at point A using the 2:1 approximation given
below. Compare the results to those obtained using the more rigorous method.
c) Assume the pad to be a strip footing with the same width, and calculate the vertical
stress increase at point A.
d) From the calculated stress distributions above for both the rectangular and strip
footing assumption, at what depth is the distributed stress equal to 10% of the
surface pressure?
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