ANALYSIS AND DESIGN OF A SHELTER SUBJECTED TO BLAST LOADING

Abstract

The objective of this thesis is to carry out analysis and design of an above ground close rectangular shelter sub-jected to conventional above ground explosion. The structure consists of a series of steel frame supporting the outer ehell of roof and wall slab. The variation of the blast parameters have been studied and the design blast parameters have been found out from the data available for 1 tonne of explosive using scaling laws. An average loading has been considered for design of roof slab and wall slab. The load transmitted by roof and wall slabs to roof girder and column has been idealized considering the dynamic reaction of roof and wall slab. The dynamic analysis of each element has been carried out by first trans-forming it into an equivalent single degree of freedom system. The dynamic analysis and design have been carried out by using the charted solution availablefor number of standard load—time functions. The numerical integration has been found necessary for the analysis of the roof girder and the frame. Except the roof girder, connections and foundation, each element of the structure have been allowed to deform in the plastic range considering a ductility factor of 5. The limit state method has been used for the design of R.C.C. members and the design criteria given by the 1S4991-1968, IS:456-1978 and IS:800--1984 has been followed in the design.