Extra emphasis and detail on 1C would be appreciated An innovation in structural

Question

Extra emphasis and detail on 1C would be appreciated

An innovation in structural engineering is the Concrete Filled Double Skinned lube (CFDST). A CFDST consists of a hollow section placed inside another larger hollow-section, and the space in between filled with concrete. The inside of the inner tube is not filled. Once filled, the CFDST acts compositely. It can be assumed that E_concrete = 30 GPa and E_concrete = 200 GPa and that both materials behave linear elastically. Consider the CFDST shown below. The outer tube has outer diameter 100 mm and thickness 5 mm, and the inner tube has outer diameter 50 mm and thickness 2.5 mm. The member is used as a column, 4 m in length, and is subjected to an axial compression. The design engineer wants to ensure that the stress in the concrete does not exceed f_concrete, max = 45 MPa. a) At what value of axial compression force does the concrete reach its maximum - permissible stress of 45 MPa? b) For the value of load calculated in part (a) above, give the following: i) Steel strain ii) Steel stress iii) Concrete strain iv) Concrete stress v) Total axial shortening c) The inner tube is now filled with concrete. Assuming that the same load as calculated in (a) above is applied, would the following increase or decrease (compared to the original case)? Explain your answers. i) Steel strain ii) Steel stress iii) Concrete strain iv) Concrete stress v) % of the overall load carried by the concrete vi) % of the overall load carried by the steel vii) Total axial shortening

Explanation / Answer

CONCLUSION:-

a)AXIAL COMPRESSION FORCE

i.e,

P=25446.9 kN

b)

ALL REQUIRED VALUE WHICH OVER TO BE CALCULATED ARE IN ABOVE IMAGES.

c)

ALL REQUIRED VALUE WHICH OVER TO BE CALCULATED ARE IN ABOVE IMAGES.

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