CADD PACKAGE FOR ANALYSIS AND DESIGN OF UNDERGROUND RC TANKS

Abstract

Computers are widely used in Civil Engineering designs as they can perform computational tasks of a magnitude far beyond the capability of any human. The problems of analysis and design of underground reinforced concrete tanks have been dealt in this dissertation. Primarily, the analysis and design of reinforced concrete underground tanks involve tedious calculations and numerous design charts and their interpolation. Any careless human error may result in fatal error. Therefore, a computer aided design would appear to be necessary. Underground tanks are used in water purification, sewage treatment and for storage of water reserve for fire fighting etc. The sides have been designed for both the cases, when tank is empty with earth pressure acting from out side and tank full with no earthfill surrounding it. A software 'RCTANK' is developed for design of various elements of underground tanks under different end conditions of wall with varying site conditions. Drafting of rectangular tank has also been done for sectional views. Static and dynamic pressures both can be dealt, with choice resting on user. Software offers great deal of flexibility in structural design and complies with relevant codal provisons, i.e. IS: 456-1978, IS: 1893-1984, IS: 3370-Part-I, II and IV. The package has been developed in FORTRAN 77 language using FORTRAN 77 and PLOT88 compilers for use on any IBM compatible computer. The package is made complete and effective by including drafting part which gives sectional views of elevation and plan of rectangular tank. The working of the software package has been illustrated by solving few design problems. (