Truss Analysis and Design Report Assignment

Assignment Task

Assessment Description

In this test, apply the relevant concepts covered in this course. In the first question, design different members of a truss, and in the second question determine loads, bending moments, shear forces and deflections in a building structure. Where relevant, reference the relevant Australian Standard Loading Codes AS1170 and ASI Design Capacity Tables for Structural Steel.

Questions

1. Use Figure 1, a pin jointed steel truss with bolted connections and the values presented in Tables 1 and 2, as well as your mathematical thinking and reasoning to respond to the following questions.

a) Ignoring the self‐weight of the members, determine the support reactions.

b) Ignoring the self‐weight of the members, determine the force in the three members AB, AC and DE. 

c) Design members AB, AC and DE.  Use Equal Angle (EA) Sections for members in Tension and assume the member is bolted with 1 Hole in Leg.  Use Square Hollow Sections (SHS) for members in Compression.  For zero‐force members use SHS 65x65x1.6.

d) Determine the stress, strain and elongation/shortening of member AB (Assume Esteel = 200,000 MPa)

e) Design the bolts for the connections on members AB, AC and DE. Use the same “Grade:8.8” bolt size for all connections.  That is, whatever bolt size is selected on one member, needs to be used on the other two members.

f) The steel price is $16 per kg, and the bolt price is provided in Table 2. Determine the total cost of the material to build members AB, AC and DE.  

2. A simple 6 storey building is to be constructed in Adelaide. Use the details provided in Figure 2, Figure 3, and Table 3 to respond to the following questions.

a) Calculate the dead load and live load per area of the floor.  The floor dead load consists of the floor weight plus a superimposed dead load for the wall partitions.

b) In the second floor beams, determine the maximum moment and maximum shear for beams A4‐B4 and B4‐C4 due to live load only.  Also, in no more than 50 words, compare and discuss the maximum moment and shear of the two beams.

c) Calculate the deflection of beams A4‐B4 and B4‐C4 in the Second floor due to the dead load only if a cross section of 310 UB 40.4 is used.  Also, in no more than 50 words, compare and discuss the deflection of the two beams. 

d) In no more than 100 words, explain why I‐shaped sections are usually used for beam members and also explain which part of an I‐shaped section resists shear and which part resists moment.

e) Column  

• Determine the force in columns A2 and B2 at the First Floor and Second Floor, due to dead load only

• In no more than words, Compare and discuss the loads of the edge (A2) and internal (B2) column.  Also, in no more than words, compare and discuss the loads of these columns in the Second and First floor. 

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