Seismic Design of Large R.C.C. Water Tank

Abstract

Nature is the best engineer as it holds thousands of tonnes of water in sky. Men, who build a structure for storage of this water, is called water tank. For earthquake analysis of R.C.C. water tank, the code IS: 1893 was published in 1984. In 2002, though the revised code is published, but in this code the criteria for earthquake analysis of water tank has not been included. In this dissertation work, an attempt has been made to analyze and design large R.C.C. water tank subjected to seismic as well as wind forces. Therefore, programs of the seismic and wind analysis and design of water tank with single container and twin containers are developed. The contents of this dissertation are divided into seven relatively independent chapters. Chapter 1 introduces the subject matter of this dissertation, and general features of liquid storage tanks. Shapes of containers in water tank are given. In Chapter 2 literature survey for liquid storage elevated water tank are presented. Survey for different shape of components for Intze tank and tank with Stacked container are presented. There are few case studies of water tank (Intze, Conical, Rectangle, Stacked container etc) presented in this chapter. Damages of water tank during past earthquake are presented. Chapter 3 shows guidelines for analysis and design of elevated water tank. Design criteria for different components of water tank are presented. Some codal provisions for water tank are presented in this chapter. In Chapter 4 program in C++ language is developed for analysis and design of elevated Intze tank with shaft staging. In this program, by giving the input data like capacity of tank, height of staging, SBC of soil, width of middle ring beam, zone for earthquake and colour scheme from IS: 875(part-iii)[7], it gives analysis and design of all components of Intze tank in output file. Both input/output files are given in this chapter. In Chapter 5 program in C++ language is developed for analysis and design of tank with Stacked containers with shaft type staging. In this program, by IV giving the input data like capacity of tank, height of staging, SBC of soil, thickness of ring girder for 1st/2nd container, thickness of bottom dome, zone for earthquake and colour scheme from IS: 875(part-iii)[7], it gives analysis and design of all components of Stacked containers in output file. Both input/output files are given in this chapter. In Chapter 6 comparison of reinforcing steel of Intze tank and tank with Stacked containers are given. Quantity of concrete, steel and shuttering area of Intze tank with different staging height and capacities are developed in this chapter. A quantity and cost comparison between Intze tank and tank with Stacked containers are presented in this chapter. The summary and conclusion of the entire study and recommendations for future work in this area are presented in Chapter 7.