For beam shown in Fig. 12.78, an influences line diagram is shown in Fig. This refers to shear force at section XX
163. The beam shown in Fig. 12.81 carries loads of 20 kN and 40 kN at points 'X'
and 'Y' respectively and produces a deflection of 6 mm at point Z
To produce deflections of 8mm and 5 mm at 'X' and 'Y' respectively, the load
required at Z would be 60 kN
A portal frame is shown in Fig. For EI constant, the deflected shape of the
frame will be as in
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false
d) A is false but R is true
Assertion A : When the system of loads shown in Fig. crosses a simple span
of any length, the absolute maximum bending moment occurs at the mid-span
when the middle load stays at mid-span
Reason R : The resultant load of the system coincides with the middle load
166. Assertion A : The concept of strain energy can be used to analyse a statically
Reason R : There is a direct relationship between strain energy of a structure and
the slopes and deflection caused in it.
167. Assertion A : In the analysis of rigid frames, the usual practice is to consider
the strain energy due to flexure only.
Reason R : The strain energies due to axial and shear forces are usually quite
small compared to that of flexure.
168. Assertion A : Whether it is maximum BM at a section or absolute maximum BM, the moving UDL should cover the entire span of a simple beam if span is less than load length.
Reason R : Whether it is maximum BM at a section or absolute maximum BM, the moving UDL should be divided by the section in the same ratio in which the
section divides the span, if the span is greater than load length.
169.Assertion A : Influence Line Diagram (ILD) for S.F. at the fixed end of a
cantilever and SFD due to unit load at the free end are same.
Reason R : ILD for BM at the fixed endof a cantilever and BMD due to unit load
at the free end are same. c
170.Assertion A : When a single load crosses a simple span of any length, the shear
force under the load to the right for all spans is constant, so long as the load
maintains the1 same all ratio (see figure
Reason R : When the load maintains the same all ratio in all spans, the reaction at
the right hand support remains the same a