Question: Example 2 A timber beam 1 0 0 m m wide by 1 5 0 m m deep is to be strengthened by two plates

Example

2

A timber beam

100 m m

wide by

150 m m

deep is to be strengthened by two plates

100 m m 12 m m

and

100 m m 6 m m .

The thicker plate is sealed to the top surface and thinner plate to the lower surface as shown in the figure. The maximum permissible stress in steel is

120

MPa& the value of modular ratio is

20 .

Calculate moment of resistance of strengthened section. Also calculate maximum stress in timber.

15

Example 2 A timber beam 1 0 0 m m wide by 1 5 0 m

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