
	Trending ▼ ICSE CBSE 10th ISC CBSE 12th CTET GATE UGC NET Vestibulares ResFinder

Structural Design - III (April 2010)

5 pages, 15 questions, 0 questions with responses, 0 total responses,

	pune_eng	+Fave Message
	Profile Timeline Uploads Q & A

Home > pune_eng >

Instantly get Model Answers to questions on this ResPaper. Try now!
NEW ResPaper Exclusive!

Formatting page ...

Total No. of Questions : 8] P1299 [Total No. of Pages : 5 [3764] - 104 B.E. (Civil) STRUCTURAL DESIGN - III (2003 Course) Time : 4 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer Q.1 or Q2, Q.3 or Q4 in Section - I. 2) Answer Q.5 or Q6, Q.7 or Q8 in Section - II. 3) Answers to the two sections should be written in separate books. 4) Figures to the right indicate full marks. 5) Use of Is 1343, IS 456, IS 3370 & non programmable calculator is allowed. 6) Neat diagrams must be drawn wherever necessary. 7) Assume any other data if necessary & mention it at the starting of the answer. 8) Mere reproduction from IS code as answer, will not be given full credit. 9) Assume any other data if required. SECTION - I Q1) a) Explain in brief : [8] i) ii) b) Lumped mass system in building frames. Single degree freedom. A post tensioned prestressed concrete beam section has top flange 550 150, web 150 550 and bottom flange 350 350 mm, is simply supported over a effective span of 16 m and carries a super imposed load of 12 kN/m over entire span. Calculate extreme fiber stresses in concrete at midspan at initial and final stage. Initial prestressing force is 1060 kN at eccentricity 450 mm at midspan and zero at support. Take loss ratio as 0.85 and unit weight concrete as 25 kN/m3. [17] OR P.T.O. Q2) a) A mild steel plate of cross section 10 mm 60 mm, of length 1100 mm is supporting a load of 160 N through a spring having stiffness K = 100 N/mm as shown in fig(1). Calculate the natural frequency of the system if modulus of elasticity of mild steel is 200 Gpa. [8] b) A post tensioned prestressed concrete beam section has top flange 500 150, web 125 600 and bottom flange 360 300 mm, is simply supported over a effective span of 16 m. The beam is prestressed with 4 No. of 12/5 Freyssinet parabolic cables with their c.g. at 120 mm from extreme bottom fiber, stressed one at a time from only one end to 900 Mpa. Calculate total loss of prestress at the age of 120 days, if k = 0.0026/m length of cable, slip of anchorage = 2 mm, Cc = 2.0, = 0.3, Es = 2 105 Mpa, concrete grade = M40, Creep and relaxation of steel = 2% of initial prestress. [17] Q3) Design a post tensioned prestressed concrete rectangular or I section beam for flexure to carry a live load of 13.6 kN/m over entire simply supported span of 14 m with M45 grade of concrete and Freyssinet cables of 12/5 (fy = 1750 Mpa) or 12/7 (fy = 1500 Mpa), including the design of end block. Draw sketches showing cable profiles and end block reinforcement details. Check fiber stresses in concrete and deflection. [25] OR Q4) a) b) State remedial measures to be taken to reduce losses in continuous PSC beams. A post tensioned prestressed concrete continuous beam ABC of cross section 250 840 mm as shown in fig(2) is prestressed with initial prestressing force of 1500 kN. The loads shown are exclusive of dead load. Locate centerline of thrust under prestress plus dead load also & [3764]-104 2 make it concordant stating the shift of cable at salient points find the stresses in concrete at extreme fibers at intermediate support take loss ratio of 0.85, AD = DB = BE = EC = 8m. The eccentricities at A & C = 0, at D & E = 220 mm (downwards), at B = 150 mm (upwards). [25] SECTION - II Q5) a) Write detailed note on Horizontal forces on building and their calculation. [8] b) Analyze a rigid jointed frame shown in fig(3) by cantilever method for lateral loads. Flexural rigidity for all members is same. Analyze beam DEF using proper substitute frame, if it is subjected to vertical ultimate live & dead load incl. of its self wt. intensities of 12 kN/m & 15 kN/m on DE and 15 kN/m & 18 kN/m on EF respectively. Calculate max. span moment for span EF and support moment at E. Design section for combined effect of vertical and horizontal loads. Adopt 15% redistribution of moments for vertical load moments Use M20, Fe415. [17] [3764]-104 3 OR Q6) a) b) Write detailed note on substitute frame method. [8] Analyze a rigid jointed frame shown in fig(4) by portal method for lateral loads. Flexural rigidity for all members is same. Analyze beam GHI using proper substitute frame, if it is subjected to vertical ultimate live & dead load incl. of its self wt. intensities of 13 kN/m & 16 kN/m on GH and 18 kN/m & 20 kN/m on HI respectively. Calculate max. span moment for span HI and support moment at H. Design section for combined effect of vertical and horizontal Loads. Adopt 10% redistribution of moments for vertical load moments Use M20, Fe500 [17] Q7) a) Write detailed note on situation and necessity of combined footing.[5] b) Design circular reinforced concrete tank resting on ground to store 5 lakh liters of water the top of tank is open take the safe bearing capacity of the supporting strata as 220 kN/m2 Design the wall and bottom slab of the tank using IS code. Draw all details of reinforcements Use M20, Fe500. [20] OR [3764]-104 4 Q8) Design a L shaped retaining wall for two layered leveled backfill for the following data Upper layer, height = 2.4 m, = 30 , = 18 kN/m3 Lower layer, height = 3m, = 31 , = 19 kN/m3 Safe bearing capacity of the underlying strata = 180 kN/m2, The coefficient friction between the base slab and the underlying strata = 0.55. Draw lateral pressure diagram and details of reinforcement of stem and base showing curtailment if any Use M20, Fe415. [25] vvvv [3764]-104 5

Formatting page ...

Additional Info : April 2010 Examination - Structural Design - III (2003 Course)
Tags : Pune, Engineering, University of Pune, Engineering question papers, Pune University, April 2010, Pune, Engineering, University of Pune, Engineering question papers, Pune University, previous year question papers, question papers, india, model question paper, pune university paper pattern, pune university syllabus, old question papers

pune_eng chat

Horizontal lines at:
Guest Horizontal lines at:
AutoRM Data:
Box geometries: