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# 1st Semester M Tech Structural Engineering (Dec-2013) Question Papers

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### 1st Semester M Tech Structural Engineering (Dec-2013) Question Papers

1. 1. USN L -tl (, 12CSE14 t First Semester M.Tech. Degree Examination, Dec. 20l3lJan.2Ol4 Structural Dynamics Max. Marks:100 Time: 3 hrs. Note: Answer any FIVEfull questions. -....J.^.*J-.-.-,..-*-.*-.*1 ,,,,,,,,,a1 C) o b. g E OJ 2 a. C) ox What is damping? What are the methods to evaluate damping? Explain any one *"lJP* (10 Marks) d,) b. -, A spring mass system has spring stiffness of 'K'N/mm and mass 'W' N:,It has natural 'W" and the natural lequency of vibration of 12 Hz. An extra 20 N mass is coupled to (10 Marks) frequency reduces by ZHz. Find 'K' and 'W'. Obtain the expression for the response of a damped SDOF system subjected to initial (14 Marks) conditions. Discuss the three cases of damping. A spring mass system kr and mr has a natural frequency fr calculate the values of kz, which is another spring which when connected to kt in parallel,increases the frequency by 30 % . (06 Marks) de 6 -^t troo cd+ i: !: OO (.) OE 3 a. b. Derive an expression for undamped forced vibratioh:of SDOF subjected to harmonic force. A machine of w: 90 kN is supforted on springs of k : 6.35 x 1011 N/mm, subjected to an exciting force of 500 kN w: 60 radls, assuming 20Yo of dampng find : steady dx force U() 4 a. boi -6 a3 b. cc 3(, 'Ca (10 Marks) - - state amplitude transmitted to foundation. (10 Marks) Derive the expression for Duhamel's integral for the response of SDOF system subjected to (12 Marks) arbitrary excitation. Obtain the response of undamped and damped SDOF system subjected to a suddenly applied (08 Marks) constant force of magnitude F6. OE io so. o.. (.)j a-- Bu 4 l.E C'- +rels F( Y) !o >,: 50coo o= o. [: I , Fo Fig. Qa(b) I, For the shear building, compute the natural frequencies and mode r< T -C I o o shapes, plot the mode shapes and prove their orthogonally. Refer Fig. Q5. Givenm:12800kg, (20 Marks) EI :20.000 kN/m2. z o ,Z'oF '*Y 1 I L T t- Fig. Qs
2. 2. 12CSE14 6 For a three storeyed shear building shown in Fig. Q6 write the equation of motion, determine the three natural frequencies, mode shapes arid plot them. Combined stiffness each floor: k. t)2 : t{) j,! Tffi,, **lr Qvnl l *',', =,i1# 7 of I n:)t/ r l{'n I I )L ltt J Fig. e6 \$ ,*li' ;r "" bf Derive the differeii bl equation of motion for free flexura{flb?htion of the simply supported beam. Sketch ttre fiisi=tlrree mode i-,,,,r*,,,, -"*-iq 'X shapes. ,i (20 Marks) r*,n :,,-,::ri d. JtrIsIIllU instruments a. Seismic ulstIuIIIgIlLS b. Rayleigh's method d/ 1 1 t i1 .,,' ,,,,," .,,,. - - *[*" qfu "*r 1 ." ils ,:i" ,! ' "ll, ,/ q. *rrt ,t 2 of2
3. 3. 12CSE153 USN First Semester M.Tech. Degree Examination, Dec. 20l3lJan.2Ol4 Repair and Rehabilitation of Structures " ''"'t""' . '"" Time: 3 hrs. Max. Marks: 100 Note: Answer ony FIVEfull questions. o o (.) L q () 1 a. Wiat are the defects normally observed in concrete structures? Discuss briefly their remedies. (10 Marks) !,,,. b. Whailts.,salphate attack? Explain about the causes and effects of sulphate attack. ito tvtartrs; o E9 2a. (10 Marks) (10 Marks) b. ,Ih -.o ool troa .E or (o+ ,rI o :1u otr 3() 3 a. b. Explain assessment procedure for evaluating damages in structures. (10 Marks) Name the various testing system used in the assessment of distressed concrete structures. (10 Marks) o2 Discuss about the evolution of diff,e?eMyfes of cracks. Explain the various factors, whieh affect the permeability of concrete. a= oc) o0c 5a. -6 N+ E|d b. -a oi3 p.a o.v oj o= A'E b. :9.9 /. Y,, ooo tr olJ (J= po tr> 7 ,.,,, d' b. =0 oVL o o z (10 Marks) (10 Marks) Explain in detail, the inspection for evaluating a fire damaged structure. Write notesio'' i) Ferro,,,cement ii) :Sulphur infiltrated concrete. Eiplain briefly advance techniques for repair. . l... . . ",,, . ...... ..::: ..::::: ,'.t,,,,. ,, (10 Marks) (10 Marks) Explain the safety precaution prior to dismantling and during dismantling. (10 Marks) Explain the various stages involved-in the repair of crackb, using epoxy injection technique. (10 Marks) -^ -; (10 Marks) Explain the maintenance procedures required fo. irrifaing to keep the building serviceable. ::, :. 6a. (10 Marks) :::',, eti a. b. c. d. Write short notes on : Corrosion mapping test Concrete chemicals for repair Surface preparation Advanced demolition techniques. (20 Marks)
4. 4. l 12CSE11 USN First Semester M.Tech. Degree Examination, Dec. 20l3lJan.2014 Gomputational Structural Mechanics .:,,;,, Time: 3 hrs. d o o q Max. Markr:,100 Note: 1. Answer any FIVEfull questions. 2. Missing data, tf any, may be suitobly ossumgd. ,::,,,,"' "' 1 a. b. ..i ' ,,, ,., , "ii (05 Marks) flexibility. Explaih the static indeterminacy and kinetic indeterminacy of the,,,1,t1'uctur., *nn Expl,,qin..the concept of stiffness and 0) 6 c. (.) ! 6s 2 a. !,. Jh Name and eapl,4in the strain energy concepts in structural analysis, iififio.,ll; (07 Marks) Develop flexibility and stiffness matrices for a cantilever beam with two degree of freedom, Shown in Fig. Q2(a). (10 Marks) troo .=N d+ noo Y() otr ts -E() 6- a2 Generate the a= for the given o() Fie. Q2(a) flexibility and stiffness r.natrices for the cantilever frame shown in Fig. Q2(b) co-ordinates. (10 Marks) (s(B .o: .G -r? d) or= a.A . o.e oj o= Fie. Q2(b) AE GE !o 5.v >'! bo" cao 'o= 3 .. Determine the displacements ., ir using flexibility method. lr< J ..i o o z (! L o 5 t<r.t Q3, :.,.,(20,Marks) lLklln) AE F> ot of the joints of the structure for the frame sholm in Fig. 1 r,,. "1.. ri;'"; -B c m o,5L n. ,a' 1=I" t' hnt J. Fig. Q3 .t'!,t' o,5 o "5"qs"x
5. 5. 12CSE11 Analyse the continuous beam shown in Fig. Q4 by flexibility method. Draw BMD and SFD. (20 Marks) Arn t- 2p FNl") -: lLq ----*-- l2rr ---J- EA l2-r4 I C6Y1l+oM'b* Fig. Qa . " ':.. .i,ii 5. Analyse the pin jointed truss shown in Fig. Q5 b flexibility method and find the"rftries in all r, the members. Assume E:200 GPa. , (20 Marks) ,,, 3*'u ;, T Y * ,,,,:.; 6a. b. I- "L 3rn ;hr,' Explain: i) local axes ,, :, ii) global axes . (04 Marks) Analyse the continuous beam shown'in Fig. Q6(b) by stiffness method. Draw BMD and SFD. (t6 Marks) F-.-.--_ 2-! _____*.- 6"rr ____{ Brrt Fig. Q61b) Analyse the frame shown in Fig. Q7 by displacement transiormation matrix. nt I'O :: (20 Marks) C ::::: Fig. Q7 Briefly discuss about band width consideration. (04 Marks) Analyse the truss shown in Fig. Q8(b) by stiffness method and determine the displacements at joint 1 and the forces in members given A : 10 cm2 and E : 30,000 kN/cm2-. (16 Marks) ffqr "T r 2om t ' Askil Fig. Q8(b) {<***{< krt