(b) The SDOF system with elasto-plastic resistance function as shown in Figure Q3(b), is subjected to a blast load with a peak of F KN and duration td seconds. Derive the expressions for the quasi-static and impulsive asymptotes of the Pressure-Impulse diagram as a function of the inelastic displacement ratio n, where n = Um/uy, for the SDOF system. (10 Marks) B Useful formula: Asin 0 + Bcos = √√A² + B² sin + tan A P (kN) Ро R (KN) Rm 0.36k Ry t (ms) u (m) td Uy Um Figure Q3(a) Figure Q3(b)

Structural Analysis
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Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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(b) The SDOF system with elasto-plastic resistance function as shown in
Figure Q3(b), is subjected to a blast load with a peak of F KN and duration
td seconds. Derive the expressions for the quasi-static and impulsive
asymptotes of the Pressure-Impulse diagram as a function of the inelastic
displacement ratio n, where n = Um/uy, for the SDOF system.
(10 Marks)
B
Useful formula: Asin 0 + Bcos = √√A² + B² sin + tan
A
P (kN)
Ро
R (KN)
Rm
0.36k
Ry
t (ms)
u (m)
td
Uy
Um
Figure Q3(a)
Figure Q3(b)
Transcribed Image Text:(b) The SDOF system with elasto-plastic resistance function as shown in Figure Q3(b), is subjected to a blast load with a peak of F KN and duration td seconds. Derive the expressions for the quasi-static and impulsive asymptotes of the Pressure-Impulse diagram as a function of the inelastic displacement ratio n, where n = Um/uy, for the SDOF system. (10 Marks) B Useful formula: Asin 0 + Bcos = √√A² + B² sin + tan A P (kN) Ро R (KN) Rm 0.36k Ry t (ms) u (m) td Uy Um Figure Q3(a) Figure Q3(b)
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