Circular Prefabricated Concrete Tanks. State-of-the-Art Report.

摘要

In the last twenty years more and more precast constructions have been built by assembling concrete segments put together either by prestressing cables or by other means. The aim of the FIP-Working Group is to collect the actual know-how and to present a 'State-of-the-Art'-report, including guidelines for the design and construction of precast segmental constructions. The study of segmental constructions with precast concrete elements has been started with particular attention to circular tanks for liquids (water, agricultural slurry or farm manure, polluted substances, etc.). In the forthcoming years thousands of tanks for agricultural slurry will be built. Therefore, liquid-tight storage systems are required. In the second chapter of the report the loads and the load combinations are described followed by a chapter on design aspects (structural arrangements, modelling techniques, imposed deformations and detailed structural design). Much attention will be paid to the design principles of tanks, especially to prestressing, the joint-systems and to the calculation principles in order to obtain economic solutions. Manufacture of the segments is only briefly reviewed with respect to the tolerances and the cover of the reinforcement. Chapter four pays attention to the effect of aggressive substances on concrete. The next chapter deals with the circumferential prestressing. The last chapter discusses the specific types of joints.