QUESTION 2

A continuous beam as shown in Figure Q2 is fixed support at A and roller supported at B,C

and D. Take the flexural rigidity, El is 50000 kNm². Using Moment Distribution Method.

a) Calculate the distribution factor (DF) of the beam. (CO2:PO2) (C3)

(5 marks)

b) The structure shown in Figure Q2 has experienced insufficient support condition due to

soil movement after several years in service. A forensic expert had identified the support

B settled by 20mm downward. Evaluate the member end forces of the structure, then

justify the condition of the beam, if the allowable increase of bending moment is limited

up to 50% from original condition. (CO2:PO2) (C5)

(17 marks)

A

25 kN/m

8m

B

*

100 kN

↓

><

2 m

6 m

C

→→K

Figure Q2

5.5 m

D

20 kN

3.5 m

E