top and closed at the base), Is 25 internal diameter of 3 m as shown in Figure 3(a). The tank is made by folding a flat structural steel S235 plate to form a cylinder by welding it along the longitudinal seam. The steel has a uniaxial yield strength of o, = 235 MPa. The tank is filled to the rim with water with densityp = 1000 kgm-3. Take factor of safety as 2. (1) If the thickness of the standpipe is t, calculate the maximum 40% von Mises equivalent stress in terms of t. Calculate the required thickness t if the weld is as strong as 30% (ii) the parent material assuming the material as well as the weld obey von Mises yield criterion.

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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3. A vertical steel thin-walled standpipe (i.e., a cylindrical tank open at the
top and closed at the base), is 25 m high and has a vertical axis and an
internal diameter of 3 m as shown in Figure 3(a). The tank is made by
folding a flat structural steel S235 plate to form a cylinder by welding it
along the longitudinal seam. The steel has a uniaxial yield strength of
O, = 235 MPa. The tank is filled to the rim with water with density p =
1000 kgm-3, Take factor of safety as 2.
(1)
If the thickness of the standpipe is t, calculate the maximum 40%
von Mises equivalent stress in terms of t.
(il) Calculate the required thickness t if the weld is as strong as 30%
the parent material assuming the material as well as the weld
obey von Mises yield criterion.
Ø3 m
Longitudinal
weld
25
Filler material
Base material
(a)
(b)
Figure 3: (a) Vertical steel standpipe with a longitudinal weld and
(b) Insufficiently filled weld
Transcribed Image Text:3. A vertical steel thin-walled standpipe (i.e., a cylindrical tank open at the top and closed at the base), is 25 m high and has a vertical axis and an internal diameter of 3 m as shown in Figure 3(a). The tank is made by folding a flat structural steel S235 plate to form a cylinder by welding it along the longitudinal seam. The steel has a uniaxial yield strength of O, = 235 MPa. The tank is filled to the rim with water with density p = 1000 kgm-3, Take factor of safety as 2. (1) If the thickness of the standpipe is t, calculate the maximum 40% von Mises equivalent stress in terms of t. (il) Calculate the required thickness t if the weld is as strong as 30% the parent material assuming the material as well as the weld obey von Mises yield criterion. Ø3 m Longitudinal weld 25 Filler material Base material (a) (b) Figure 3: (a) Vertical steel standpipe with a longitudinal weld and (b) Insufficiently filled weld
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