# 8-5 Conjugate-Beam method. 8-5 Conjugate-Beam method. 8-5 Conjugate-Beam method. 8-5 Conjugate-Beam method

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1 The basis for the method comes from the similarity of eqn.1 &. to eqn 8. & 8. To show this similarity, we can write these eqn as shown dv dx w d θ M dx d M w dx d v M dx Here the shear V compares with the slope θ, the moment M compares with the disp v & the external load w compares with the M/ diagram To make use of this comparison we will now consider a beam having the same length as the real beam but referred to as the conjugate beam, Fig 8. 1 Or intergrating Fig 8. V wdx M [ wdx]dx M θ dx M v dx dx 1

2 The conjugate beam is loaded with the M/ diagram derived from the load w on the real beam From the above comparisons, we can state theorems related to the conjugate beam Theorem 1 The slope at a point in the real beam is numerically equal to the shear at the corresponding point in the conjugate beam For e.g, as shown in Table 8., a pin or roller support at the end of the real beam provides zero disp. but the beam has a non-zero slope Consequently from Theorem 1 &, the conjugate beam must be supported by a pin or roller since this support has zero moment but has a shear or end reaction When the real beam is fixed supported, both beam has a free end since at this end there is zero shear & moment 5 7 Theorem The disp. of a point in the real beam is numerically equal to the moment at the corresponding point in the conjugate beam When drawing the conjugate beam, it is important that the shear & moment developed at the supports of the conjugate beam account for the corresponding slope & disp of the real beam at its supports Corresponding real & conjugate beam supports for other cases are listed in the table Table 8. 8

3 Example 8.1 Example solution Determine the slope & deflection at point B of the steel beam shown in Fig 8.(a) The reactions have been computed Take E 0GPa I 75(10 )mm The conjugate beam is shown in Fig 8.(b) The supports at A and B correspond to supports A and B on the real beam The M/ diagram is ve, so the distributed load acts downward, away from the beam Since θ B and B are to be determined, we must compute V B and M B in the conjugate beam, Fig 8.(c) 9 11 Example 8.1 Example solution Fig 8. + F y 50kNm V 50kNm θ B V 50kNm [00(10 ) kn / m ][75(10 )(10 1 ) m ] 0.00rad

4 Example solution With anticlockwise moments as + ve, M 50kNm (8.m) + M 08kNm B M 08kNm [00(10 ) kn / m ][75(10 )(10 1 ) m ] Example 8.1 Determine the max deflection of the steel beam shown in Fig 8.5(a) The reactions have been computed Take E 0GPa I 0(10 )mm 0.019m 1.9mm 1 15 Example solution Example 8.1 The ve signs indicate the slope of the beam is measured clockwise & the disp is downward, Fig 8.(d) Fig

5 Example solution Example solution The conjugate beam loaded with the M/ diagram is shown in Fig 8.5(b) Since M/ diagram is +ve, the distributed load acts upward The external reactions on the conjugate beam are determined first and are indicated on the free-body diagram in Fig 8.5(c) Max deflection of the real beam occurs at the point where the slope of the beam is zero Assuming this point acts within the region 0 x 9m from A we can isolate the section Using this value for x, the max deflection in the real beam corresponds to the moment M Hence, With anticlockwise moments as + ve, M 5 1 (.71) 1 (.71).71 (.71) + M ' Example solution Example solution Note that the peak of the distributed loading was determined from proportional triangles w / x (18/ ) / 9 V ' + Fy 5 1 x + x x.71m (0 x 9m) OK 01.kNm max M ' 01.kNm [00(10 ) kn / m ][0(10 ) mm (1m /(10 ) mm )] 0.018m 1.8mm The ve sign indicates the deflection is downward

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