Computation of Surface Wave Parameters and Peak Particle Velocity

Abstract

In recent times, the rise in terrorist activities has underscored the critical need for designing structures with blast resistance capabilities. However, many Indian codes currently in place do not adequately address the issue of blast loads. This knowledge gap poses a significant challenge to engineers who must ensure the safety and security of structures against such threats. In light of this, the objective of this study is to provide an educational resource to bridge this gap by exploring various methods for calculating blast loads on structures. This paper delves into the subject matter, discussing different methodologies and approaches for estimating blast loads on structures, with a specific focus on the Unified Facilities Criteria (UFC) guidelines. To illustrate the practical application, a numerical example is presented, demonstrating the computation of blast loads on structures using the UFC guidelines. Notably, the results reveal that the surface blast load exhibits an exponential variation along the front wall of the structure. Furthermore, the study introduces the concept of peak particle velocity (PPV) as a parameter for identifying the threshold vibration level that would cause no structural damage. The methodology suggested by the United States Bureau of Mines (USBM) is adopted to calculate the PPV and the corresponding results are presented. By providing insights into blast load computation and the determination of safe vibration levels, this study contributes to enhancing the understanding and preparedness of engineers when it comes to designing structures that can withstand and mitigate the destructive effects of blasts.