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The main roof truss of a resort is to be built using MGP12 grade seasoned radiata pine. The roof truss is shown in Figure 1.

The main roof truss of a resort is to be built using MGP12 grade seasoned radiata pine. The roof truss is shown in Figure 1.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Assessment Task 3 The main roof truss of a resort is to be built using MGP12 grade seasoned radiata pine. The roof truss is shown in Figure 1. The centre section of the bottom chord is subjected to a strength limit state tensile force of 10.2 kN due to permanent loads. The self-weight of the truss in addition to other roof furniture contributes to a strength limit state bending moment in the member of 0.32kNm. The nominal thickness of available timber for bottom chord is 35 mm. Commercially available depths are given in Table 1. Connections at the ends can be assumed to be through 2-M16 bolts, in 18 mm diameter holes for each bolt. Based on strength limit state, design the most economical depth for highlighted member to meet the design loads. Axial tension: factored permanent load =10.2kN Flexural: Factored permanent load = 0.32kNm Location: Melbourne, Victoria. Note that the lateral restraints are at the nodes only and due to diagonals and bracing between trusses. TABLE 1- Available depths unseasoned 50 75 seasoned 45 70 90 120 140 170 190 220 240 270 290 315 340 365 390 100 125 150 175 200 225 250 275 300 325 3.5m 350 375 Figure 1 400
Transcribed Image Text:Assessment Task 3 The main roof truss of a resort is to be built using MGP12 grade seasoned radiata pine. The roof truss is shown in Figure 1. The centre section of the bottom chord is subjected to a strength limit state tensile force of 10.2 kN due to permanent loads. The self-weight of the truss in addition to other roof furniture contributes to a strength limit state bending moment in the member of 0.32kNm. The nominal thickness of available timber for bottom chord is 35 mm. Commercially available depths are given in Table 1. Connections at the ends can be assumed to be through 2-M16 bolts, in 18 mm diameter holes for each bolt. Based on strength limit state, design the most economical depth for highlighted member to meet the design loads. Axial tension: factored permanent load =10.2kN Flexural: Factored permanent load = 0.32kNm Location: Melbourne, Victoria. Note that the lateral restraints are at the nodes only and due to diagonals and bracing between trusses. TABLE 1- Available depths unseasoned 50 75 seasoned 45 70 90 120 140 170 190 220 240 270 290 315 340 365 390 100 125 150 175 200 225 250 275 300 325 3.5m 350 375 Figure 1 400
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