CIV2235—STRUCTURAL MATERIALS
Week 7 Practice Class
Elastic and Plastic Section Properties;
and Masonry Materials
Part A - Elastic and Plastic Section Properties
Question 1 (50 marks)
For the Grade 300 box-section made of heavily welded plates shown in Figure 1, do the following:
a. Find the position of the centroid (neutral axis, N.A.) of the cross-section. (5 marks)
b. What is the second moment of area ("moment of inertia" I) of the section taken about the neutral axis? (5 marks)
c. Compute the elastic section modulus Z. (5 marks)
d. Find the location of the Equal Area Axis (y) of the section. (7.5 marks)
e. Calculate the plastic section modulus S of the section. (7.5 marks)
f. What is the shape factor (S/Z) of the section. (5 marks)
g. Using the table below determine the yield stress for the top flange, bottom flange and the web. (5 marks)
h. Calculate the maximum plastic moment capacity of the section. (10 marks)
Figure 1
Part B – Masonry Materials Technology
Question 2 (50 marks)
Sketch the following. Please label your sketch with the relevant details that distinguish each different masonry element type.
a. Solid and cored brick and hollow concrete masonry units illustrating the following features on each unit: face, frog, core, head, face shell, web, core and arris. (10 marks)
b. Buttress and Engaged Pier on a masonry wall. On your sketch, label each and explain the function of each. Describe the properties of the wall cross-section altered by each. What is the difference between a buttress and an engaged pier? (15 marks)
c. A section through an articulation joint. Using sketches illustrate where are they required and contrast with places they are not required. Reference the appropriate standard and clause(s) for articulation joints. (15 marks)
d. A section through a lintel over a window opening supporting a cavity wall. Show the DPC and how any moisture in the cavity is brought back outside the building. (10 Marks)