Question 2 A simply supported wooden I-Beam with a 3.6m span supports a distributed load of intensity 4-1.5kN/m over its length as shown in Figure Q2.1 and the cross section of the same beam is shown in Figure Q2.2. The web of the beam is from Douglas-fir plywood and 10mm thick pine wood plate has been glucd as flanges. The modulus of clasticity of

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Question 2 A simply supported wooden I-Beam with a 3.6m span supports a distributed load of intensity 4-1.5kN/m over its length as shown in Figure Q2.1 and the cross section of the same beam is shown in Figure Q2.2. The web of the beam is from Douglas-fir plywood and 10mm thick pine wood plate has been glucd as flanges. The modulus of clasticity of plywood and pine are 11GPa and 8.3GPa respectively. a) Determine the second moment of are of the composite section [06 marks] b) Calculate the maximum bending stress in the plywood web and pine flanges [10 marks] c) What is the maximum allowable load for quer if the allowable stresses are 11MPa in flanges and 8MPa in web? [04 marks] 3.6 m Figure Q2.1 Beam Details Page 3 of 6 2 100mm 120min LOmmen 80mm Dom

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A simply supported wooden I-Beam with a

3.6 m

span supports a distributed load of intensity

q^{- I .5 k N / m}

over its length as shown in Figure Q2.1 and the cross section of the same beam is shown in Figure Q2.2. The web of the beam is from Douglas-fir plywood and

10 mm

thick pine wood plate has been glued as flanges. The modulus of elasticity of plywood and pine are IIGPa and 8.3GPa respectively. a) Determine the second moment of are of the composite section [06 marks] b) Calculate the maximum bending stress in the plywood web and pine flanges [10 marks] e) What is the maximum allowable lood for quer if the allowable stresses are

11 MPa

in Alanges and

8 MPa

in web? [04 marks]

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