Abstract
The present study investigates the performance of steel structures plagued with plan irregularities subjected to underground blast-induced excitations. The building plan irregularity is considered by comparing the structural performance of various geometrical shape buildings, namely square, rectangle, L shape and C shape. The blast load is calculated by considering constant blast charge weight and varying the standoff distance. The study installs resilient control systems, namely fluid viscous dampers and X-plate dampers within the selected eleven storey steel buildings. An analytical approach is adopted to investigate the efficiency of passive control techniques with the help of finite element programme. A parametric study is also carried to determine the most efficient damper properties and damper type in improving the performance of steel buildings. Three damper placement techniques are also evaluated such as zig–zag pattern, alternate floor damper placement and dampers at all locations to optimize the number of dampers in achieving the maximum reduction in structural responses. The study concludes that the fluid viscous and X-plate dampers yield a maximum reduction in top storey peak displacement at a standoff distance of 400 m in the range 58% and 88%, respectively. The study also reports that the viscous damper and X-Plates prove to be an efficient passive control technique for irregular shaped steel buildings as compared to regular shaped buildings.
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Abbreviations
- \(\ddot{{\varvec{x}}}\) g :
-
Blast-induced ground acceleration
- v :
-
Peak particle velocity
- t a :
-
Time of arrival
- R :
-
Standoff distance
- c :
-
Wave propagation velocity of soil
- f c :
-
Uniaxial compression strength of rock particles
- SD:
-
Scaled distance
- Q :
-
Charge mass
- F :
-
Damping force
- C :
-
Damping coefficient
- V :
-
Velocity of piston
- α :
-
Damping exponent
- A 1, A 2, A 3, A 4, A 5 :
-
Type of group A dampers
- B 1, B 2, B 3, B 4, B 5 :
-
Type of group B dampers
- E :
-
Modulus of elasticity
- σ y :
-
Yield Stress
- H :
-
Strain hardening rate
- t :
-
Thickness of X-plate damper
- b :
-
Breadth of triangular portion (X-plate damper)
- a :
-
Height of triangular portion (X-plate damper)
- n :
-
Yielding exponent
- k d :
-
Effective stiffness of XPD
- E y :
-
Yield force of XPD
- q :
-
Yielding displacement in XPD
- FVD:
-
Fluid viscous damper
- XPD:
-
X-plate damper
- RCC:
-
Reinforced cement concrete
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Raikar, R.G., Kangda, M.Z. Effect of plan irregularity on the performance of steel buildings subjected to blast-induced vibrations. Innov. Infrastruct. Solut. 8, 77 (2023). https://doi.org/10.1007/s41062-023-01034-8
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DOI: https://doi.org/10.1007/s41062-023-01034-8