t BSCS/BTCE22

IV Semester B.TECH Examination, Jan/Feb 2014STRUCTURAL ANALYSIS

Time: 3 Hours Max. Marks: 75

GROUP A: Answer any three questions. (euestion No. 1 is computsory)Q'1 Find the strain energy stored due to bending of a steel prismatic bar of crosssection 100mm x 150mm deep and T lglg acting as a cant,ever supporting pload of 20KN at free end. Take E:200KN7mm^i. (05)Q.2 A beam simply supported at theend_hu, u rp* l. tt is sub.jected it equar andopposite end couples Mo. Find the slope at ihe ends and central a.ni.tiorr.lro;Q'3 A single riveted butt joint is to be prorid.d for connecting two plates 1Ommthick with 2}mmdiameter rivets. suggest the,necessary pitch and theefficiency of the joint. Take fs : 100 ,i/mmn2, fu= so Nl-- ^2, ft: r50N/mm^2.Q'4 A hollow circular column 2m long has one of its end fixed and the other.#o'free and has to support an axial load of 500KN. Th. intemal diarneterls 0.gtimes the external diameter. Allowing u a"tor oi.ur*y of 4 calculate theexternar and the thickness of metar .use Rankinesrs formula. (10)Q'5 A cantilever of.length I is propped at free end. The cantilever carries auniformiv distributed loadof wper unit run. Find bil;;;;"fruu"#,r,.

level of the fixed end the level oith" prop -uJu" fixed so that the lo;d maybe equally shared by the supports. -rzrvs ev urqL Lrrs ru.l

(r0)

GRouP B: Answer any three questions. (euestion No. 6 is compursory) '|

Q'6 A propped cantilever of length I is subjected to a couple M at a section distantll4 fromthe propped end. Find the vertical reaction at the prop and thebending moment at the fixed end. r

Q'7 A coluirn timber section 150; x 20pmm is 6m long both ends being o*#.t)Find the safe load for the column. use Eulers's formula and allow a factor of^ safety of 3. Take E = 17500N/mm62Q'8 A fixed b"rl of span o* "*i., two points of 150KN and 240N u, aiuun.!l.0)@ 2M and 4m from Gft end .Find the

"nd rno,,"rt* pino also the maximuil"""'

Q'9 A mild steel tube !m long, 30mm interial diameter and 4mm thick is used as astrut with both ends fixed. Find the collapsing louJuy Euler,s formula. Take E:2.1x 1065 N/mm^2.Q.10 A tension member of a truss consists of two angles gOmm x gmm.If two

(10)

angles are welded on either side of a-gur."t ptui" ut it . ioi* ;;G tt e";oint. ,Axial tension in the member is 220KN.Permissible shea, in the welds :102.5N/mm^2. Use 6mm.Fillet welds.

v'ver ,r ,rw vvvrlr. - (10)

GROUP C: AII euestions are Compulsory. ,

lI

Q'11 Fill in the branks (Each question carries 2 marks)(i) Riveted joiltg are mainly of two types, LaO and butt joint.(ii) A beam which is providld with more than twotupports is called a Gtnhnv-ac"r b-e.a.a(iii) A fixed beam is beaming whose end support, u;"',.,;ir;hffi;

",rd;i*.,remain JA-,., ,

!11) ro=!{gffi metrrod is used for determining deflection of a load.(v) The -_* for girder is resisted ."tir.ty"uy tt

" web and the shear stress ,

intemity innifo; A. ;;'-"

Q.12 Multipre choice question. (Each question carries 2 marks)(i) The Euler's formula for column is valid for r

(a) Zerc Slendemess Ratios1p)Zar ge Slenderness Ratio

(c) Small Slenderness Ratio(d) Alt of these

(ii) T$_size of rivet is expressed by _4i6) Len*h of shank

,tbfDiameter of shank(c) Type of Head(d) all of these

(iii) Junction between the(a) Lap Joint(b) Bun Joint

o.ref rinet(d) Shearjoint

flange and web of the beam is known as

(iv)fl:T,,lYjl.,:3lg*- wide and t0Tl thick, A rivet of nominal diameter18mm is driv-en. The sectional area"f th.;i;;(a) 1800 mm2(b) 2805mm2

luftzo *m,' 1d13242mm2(v) which are the following is not a compression member

(a) Strut(b) Tie(c) Rafter

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Q.13 True or false (Each question carries 1 marks)(i) The column

|avi.ns very large slendemess ratio fails in elastic buckling. /(iD If a beam is fixed ut uoit, "ni

iii, calred a built in, or fixed beam. t.(iii) A fillet weld stressed in lontitrair,at shear is k"il as side fillet weld. r(iv) The effective length is the .ffirt.a rgngth of the column. F(v) Bearing fa,ure oia rivet o.".r^ when thi .ivet is-crushed by the prate.f

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