Behavior of Reinforced Cement Concrete Multistorey Building Under Blast Loading

Abstract

The blast explosion nearby and within the structures are the manmade activities caused due to terrorist activity or gas cylinder blast or quarry blasting. These cause the catastrophic damage to the building components. A critical study is presented in this report to estimate the blast loading and its dynamic effects on various component of MDOF structure. This study could be done analytically by developing the MATLAB codes for MDOF systems. The experimental investigation for structures under blast effect is much difficult and precise instrumentation are required, so this could not be examined in the current project study. However, the analytical findings of MATLAB program results for some standard cases are going to verify over the finite element software. Two models of MDOF fixed base system with and without blast loading is being considered for the study. The subsurface blast explosion is only being considered for the study over MATLAB, However the surface and subsurface blast explosion is being considered for the study of 3D building over FE software package. The positive impulsive triangular load is only being considered for the time history analysis. For the present study the material behavior is restricted to linear elastic only. The mathematical formulation of MDOF systems are solved by using New Mark Beta implicit step by step integration method. The entire study is focused on time domain form only. The structural output results are measured in terms of structural displacement, absolute acceleration, storey shear force and base shear. The analytical investigation is being carried out for the blast load parametric prediction. In the present study, the effective blast resistant technique for the protection of structural components could also been suggested.