Thursday, December 18, 2014

Characteristic of strength of materials

Two (2) type specimen (RA & RB) was subjected to tension in accordance with the MS 146:2006 provisions by using universal testing machine. The results of the tensile tests indicating the yield stress and ultimate stress is shown in Table 1 below.

Table 1: Table 2: Average Value for  Yield Stress and Ultimate Stress
Sample Designation
Yield Stress (N/mm2)
Ultimate Stress (N/mm2)
RA
518.18 ± 7.12
585.64 ± 4.32
RB
432.16 ± 5.32
570.08 ± 3.12

i)         Given fk = fm -1.86s. Calculated the characteristic of strength for those concrete rebar steel.
ii)   Given the minimum provisions of MS 146:2006 - Specification for Carbon steel bars for the reinforcement of concrete is as Table 2 below. Determine the safety of those samples as reinforcement steel bar. 

Table 2: The minimum provision of MS 146: 2006
Standard
Characteristic Strength (N/mm2)
Ultimate/Yield Strength Ratio
MS 146:2006
460
1.05


Answer
====================== 

i)   Given fk = fm -1.86s
      Characteristic of strength for RA sample è fk = 518.18 – 1.86(7.12) = 504.94
      Characteristic of strength for RB sample è fk = 432.16 – 1.86(5.32) = 422.26


ii)   Characteristic of strength for RA sample è = 504.94 (above the code) = Safe #
       Characteristic of strength for RB sample è = 422.26 (below the code) = Unsafe #

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