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Earthquake Engineering (Elective II) (April 2010)

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Total No. of Questions : 12] P1304 [Total No. of Pages :3 [3764] - 113 B.E. (Civil) EARTHQUAKE ENGINEERING (2003 Course) (Elective - II) Time : 3 Hours] [Max. Marks:100 Instructions to the candidates: 1) Solve Q.No. 1 or Q.No. 2, Q.No. 3 or Q.No. 4, Q.No. 5 or Q.No. 6 from section I and Q.No. 7 or Q.No. 8, Q.No. 9 or Q.No. 10, Q.No. 11 or Q.No. 12 from section II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Your answers will be valued as a whole. 6) Use of logarithmic tables, slide rule and nonprogrammable electronic pocket calculator is allowed. 7) Assume suitable data, if necessary. 8) Use of latest IS codes. 9) All formulae used, numerical values substituted and answers at intermediate steps should be shown clearly. SECTION - I Q1) a) b) Q2) a) b) Q3) a) b) c) Name the major plates of earth and explain the Plate Tectonic Theory.[6] What is intensity of earthquake? Describe Modified Mercalli Earthquake Intensity Scale and Magnitude of earthquake. [10] OR State the causes of earthquake and describe the nature of earthquake motion. [6] Classify and describe with suitable sketches different types of waves generated by an earthquake and their effects on structure. [10] Obtain expressions for dynamic amplification factor (DAF) for un-damped SDOF system subjected to harmonic loading. Also state when the displacement will remain in phase with applied load? [6] What is logarithmic decrement? Prove that logarithmic decrement = 2 for very small values of . [6] In a free vibration test on single storey RC structure following observations are recorded[6] P.T.O. i) Lateral force = 36,000 kg. ii) Initial horizontal displacement = 50.8 mm. iii) Time required for 4 complete cycles = 2 sec. iv) Amplitude at the end of 4 complete cycles = 25.4 mm. Compute 1) damping ratio, 2) natural period of un-damped vibrations. OR Q4) a) b) c) For a single degree damped free vibration system, derive the expressions for damped frequency and critical damping. [6] Explain Transient and Steady State Vibrations. [6] A roof of one storey building has a mass of 1500 kg. All columns supporting roof together offer lateral stiffness of 20,000 N/m. The viscous damping coefficient is 500N/m/s. Calculate undamped natural frequency, damped frequency and period. [6] Q5) Obtain natural frequency of vibrations and mode shapes. Write equations of motion considering the building to be shear building with EI for each column [16] 4.5 x 106 N/ m2. Refer Figure 5.1. OR Q6) Calculate the normal frequency and mode shapes of a three storey building having equal floor masses and uniform stiffness of columns in each storey. The building consists of one bay only. [16] SECTION - II Q7) Single bay two storey portal frames are used for a building. Height of columns in each storey is 5.0 m and the span of beams is 8m. The frames are spaced at 5m c/c along length of the building. Calculate the lateral forces induced at each beam level due to an Earthquake force acting along the direction of beams. The building is in Zone IV. Each floor has a total Dead load of 5kN/m2 and is to carry an Imposed load of 3 kN/m2. Assume other data as required. [18] [3764]-113 2 OR Q8) Design a shear wall in an RCC portal frame. The wall is 5m long and 4.5m in height. It is to resist an axial load of 7000 kN, a shear of 2500 kN and a moment of 4000 kNm. design all details for the wall. Assume suitable other data as required. [18] Q9) Design an isolated column footing subjected to an axial load of 2000 kN and a moment of 100 kNm. along the longer side. Assume column section 400 mm by 600 mm. Use concrete of M25 grade and reinforcement of grade Fe 415. Take SBC of foundation strata as 250 kN/m2. Assume all other suitable data as required. [16] OR Q10)At a column beam junction at 3rd floor level has columns from 3rd to 4th storey of size 300 mm x 500 mm. connected to a beam of width 300mm and total dept of 800mm. Calculate the moment capacity of the joint and give all details of ductile provision according to IS code 13920. Take concrete of M25 grade and main reinforcement of Fe 415 grade. Assume suitable other data as required. [16] Q11)a) Give details of expected damages by Earthquake in structures with i) Soft storey ii) Floating columns iii) b) Building frames without shear panels. iv) Unsymmetric plan. [8] Dampening percentage for a building frame and its consequences in seismic Analysis. Explain how variations in dampening can be accounted for. [8] OR Q12)Write short notes on : a) Base isolation. b) Retrofitting for bridges. c) Retrofitting for masonry houses. d) Tuned mass dampeners. kbkb [3764]-113 3 [16]

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Additional Info : April 2010 Examination - Earthquake Engineering (Elective II) (2003 Course)
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