Effect of the Sliding of Stacked Live Loads on the Seismic Response of Structures

Authors

  • Surya Prakash Challagulla BITS-Pilani
  • Chandu Parimi BITS-Pilani
  • P. K. Thiruvikraman BITS-Pilani

DOI:

https://doi.org/10.4186/ej.2020.24.4.97

Keywords:

Primary structure, secondary bodies, coulomb friction, stacked loads, sliding

Abstract

Dynamic interaction between sliding live loads and the structure they act on is significant in the seismic analysis and design of the structure. The problem becomes more complex when the live loads are in the form of stacks. This paper presents a numerical model to simulate the dynamic interaction between a primary structure (PS) and a set of stacked bodies lying on it. Individual bodies in the stack were termed as secondary bodies (SBs) in this study. The lowest SB in the stack interacts with the structure through friction. Similar frictional forces also exist between different levels of the stack. This numerical model was verified with a Finite Element model. A parametric study was performed on the seismic response by varying the dynamic properties of the structure and SBs. The energy dissipation is found to be significant due to sliding within the stack. A novel methodology is proposed to calculate a modified structural period (Tnew) of the structure to use in its design. It was found that the Tnew varies significantly with the structural period, mass ratios, and coefficients of friction. Finally, design equations are proposed to calculate the Tnew . Two Indian seismic hazard levels were considered for this study.

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Author Biographies

Surya Prakash Challagulla
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Department of Civil Engineering, BITS-Pilani, Hyderabad 500078, India

Chandu Parimi
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Department of Civil Engineering, BITS-Pilani, Hyderabad 500078, India

P. K. Thiruvikraman
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Department of Physics, BITS-Pilani, Hyderabad 500078, India

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Published In
Vol 24 No 4, Jul 31, 2020
How to Cite
[1]
S. P. Challagulla, C. Parimi, and P. K. Thiruvikraman, “Effect of the Sliding of Stacked Live Loads on the Seismic Response of Structures”, Eng. J., vol. 24, no. 4, pp. 97-110, Jul. 2020.
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