EVALUATION OF RIGID BODY SLIDING ANALYSIS FOR MODULAR STEEL STRUCTURES SUBJECTED TO BLAST LOADING

Year 2019, Volume: 20 Issue: 4, 413 - 426, 30.12.2019

Bülent Erkmen Bilal Balcı

https://doi.org/10.18038/estubtda.500973

Abstract

Blast resistant modular steel (BRMS) buildings
are prefabricated cost-effective and explosion-proof structures used to shelter
personal near hazardous-material handling or storage facilities, in facilities
handling high-pressure processes, and within designed blast zones in mining,
petrochemical, and military industries. Typically, BRMS buildings are designed
to be fixed (anchored) to their foundation. However, this design approach can
result in very large anchorage and foundation reactions, which result in very
large and high-cost foundations. Therefore, an alternative foundation approach
which minimize foundation reactions and known as unanchored or free-to-slide
foundation has recently attracted much attention for BRMS buildings. In this
study, dynamic behavior of a typical BRMS building under blast loading with
unanchored foundation was determined using 3D nonlinear dynamic finite element
and a simplified numerical analysis method. The developed numerical analysis
method is based on nonlinear numerical integration scheme, and it was verified
using the finite element results. Applicability of the proposed numerical
analysis method was evaluated using finite element results for a typical
unachored BRMS building subjected to blast loads. Several values of coefficient
of friction between the foundation and BRMS building were considered. The
computed building sliding, horizontal velocity, acceleration, and horizontal
foundation reaction histories were used to evaluate applicability of the
proposed numerical method. The overall results show that the proposed simple
numerical analysis method based on rigid-body dynamics is suitable to predict
building sliding and sliding velocity, but unconservative in terms of
foundation vertical reaction and horizontal acceleration.

Keywords

Blast, Numerical Integration, Modular Steel Building, Sliding foundation

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