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A 1.8m simply supported timber floor joist with b=25mm and d=175mm with bridgings at third points carries a uniform load of 21KN/m. If the allowable

A 1.8m simply supported timber floor joist with b=25mm and d=175mm with bridgings at third points carries a uniform load of 21KN/m. If the allowable bending stress of wood is 14.1MPa, calculate its fiber reduced flexural stress, Fb' in MPa due to its lateral stability condition. Express your answer in MPa in 2 decimal places

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