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Seismic Tank Design Concepts E-Course Part III Solutions

Explore solutions for seismic design of tanks, including base shear coefficients calculation. Understand key factors affecting seismic forces and coefficients. Improve your seismic design knowledge.

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Seismic Tank Design Concepts E-Course Part III Solutions

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  1. Solution 2 Date of assignment: 20January Date of solution: ?? January E-Course on seismic design of tanks

  2. Part II: True/ False • Identify the following statements as True or False 2.1) Seismic force depends on mass of structure. True 2.2) In IS 1893(Part 1):2002, there are five seismic zones. False There are four zones, numbered from II to V. 2.3) In IBC 2003,response modification factor for buildings with good ductility is lower than that for elevated tanks on frame type staging False For a building with good ductility, response modification factor, R = 8.0 as against, R = 3.0 for elevated tanks on frame staging E-Course on Seismic Design of Tanks / January 2006

  3. Part II: True/ False (contd…) 2.4) In IS 1893:1984,performance factor, K for buildings with Good ductility is more than that for elevated tanks False Performance factor, K is same (K = 1.0), for a building with good ductility and elevated tanks. 2.5) Importance factor for tanks is higher than for buildings. True 2.6) Damping of structure does not affect base shear coefficient. False See Table 3 of IS 1893(Part 1):2002 and Fig. 2 of IS 1893:1984 E-Course on Seismic Design of Tanks / January 2006

  4. Part II: True/ False (contd…) 2.7) In IS 1893(Part 1):2002, base shear coefficient depends on type of foundation. False In IS 1893(Part 1):2002, base shear coefficient does not depend on type of foundation. Rather, in IS 1893:1984, it use to depend on type of foundation. E-Course on Seismic Design of Tanks / January 2006

  5. Part III: Solutions 2.1)As per IS 1893:1984, obtain base shear coefficient for following structures using response spectrum method (Fo = 0.4,  = 1.0; consider 5% damping) 1) A building with good ductility and time period of 1.1 sec. 2) A building with low ductility and time period of 1.1 sec. 3) An elevated tank with time period of 1.1 sec. Solution: In response spectrum method, base shear coefficient is expressed as: Ah = KIFoSa/g for buildings Ah = IFoSa/g for elevated tanks We have, Fo = 0.4,  = 1.0 E-Course on Seismic Design of Tanks / January 2006

  6. Part III: Solutions All three structures have time period of 1.1 sec and damping of 5%, and hence, from Figure 2 of IS 1893:1984, Sa/g = 0.1 • For building with good ductility: K = 1.0, I = 1.0 Ah = KIFoSa/g = 1.0 x 1.0 x 1.0 x 0.4 x 0.1 = 0.04 • For building low good ductility: K = 1.6, I = 1.0 Ah = KIFoSa/g = 1.6 x 1.0 x 1.0 x 0.4 x 0.1 = 0.064 • For elevated tank: I = 1.5 Ah = IFoSa/g = 1.0 x 1.5 x 0.4 x 0.1 = 0.06 E-Course on Seismic Design of Tanks / January 2006

  7. Part III: Solutions 2.2) For following elevated tanks, obtain base shear coefficient as per IS 1893:1984 (Fo = 0.4,  = 1.0) 1) Time period = 0.5 sec; damping of 0%, 2% and 5% 2) Time period = 1.4 sec; damping of 0%, 2% and 5% Solution: Base shear coefficient for tank is: Ah = IFoSa/g We have, Fo = 0.4,  = 1.0 and Importance factor, I = 1.5 Values of Sa/g are to be obtained from Fig. 2 of IS 1893:1984 E-Course on Seismic Design of Tanks / January 2006

  8. Part III: Solutions Note the effect of damping on base shear coefficient E-Course on Seismic Design of Tanks / January 2006

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