Indeterminate Structures and Stress

  • Thread starter G-reg
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Homework Statement


A tunnel of length L = 141 m, height H = 6.9 m high, and width 6.0 m (with a flat roof) is to be constructed at distance d = 60 m beneath the ground. The tunnel roof is to be supported entirely by square steel columns, each with a cross-sectional area of 960 cm2. The mass of 1.0 cm3 of the ground material is 2.8 g


What is the total weight of the ground material the columns must support?

I have attached the picture that goes with this problem; hopefully it works!


Homework Equations



Volume = L(w)(d) = (141m)(6m)(60m) = 50760m^3

1.0cm^3 = .01m^3

2.8g = .0028kg

Total weight = Volume * .0028kg * 9.8m/s^2




The Attempt at a Solution



Total weight = Volume * .0028kg * 9.8m/s^2

I know that this is wrong but I can't come up with anything else that makes sense and could use some help! Thank you in advance!
 

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