Case study CIE5130 - Design of cylindrical reservoirs

1 Introduction Aim of tiiis assignment is to study the design and execution aspects of storage structures in reinforced and prestressed concrete. Special attention is paid to the wall-to-base connection (case 1: sliding, case 2: monolithic; rigid) and the distribution offerees in the structure under different types of loading.

Case study CIE5130 - Case 1

2 Data of tPie reinforced reservoir Height of the wall Diameter Wall thickness Liquid head Tree board' Liquid density

H [ m ] D [ m ] hw > 220 mm HI [m] to be chosen YI = 10 kN/m^

case 2: r igid case 1: sUding

Materials: Reinforced concrete Steel Selfweight of the concrete

C28/35 B500 25 kN/m^

3 Reservoir in reinforced concrete

a. Determine the ring forces in the wall under hydrostatic load, expressed in the parameters H, D and Yi- Assume a 5//£///7g'wall-to-base connection.

b. Determine the required amount of horizontal reinforcement A^ per unit of height as a function of the volume of the reservoir. Assume that the height/diameter ratio of the reservoir is 1:5. Crack width limit: Wk < 0.1 mm.

NOTE: When you calculate required amount of reinforcement, you have to check whether the wall is in the stage of a not fully or a fully developed crack pattern. For the latter case you have to use an additional term in the crack width expression!

c. For which volume of the reservoir becomes a solution in reinforced concrete undesirable? Why? (Note: Consider the required distance/spacing between the reinforcing bars and the diameters of the reinforcing bars to be used)

d. Check whether the required crack width Wk = 0,1 mm is sufficiently stringent to ensure a liquid tight structure (with regard to self-healing: Use Lohmeyer's diagram)

e. |v|ake a drawing of the reservoir with a volume of 1500 m''. Present the detailing of the wall-to-base connection in case of both a sliding sné a /770/70//Z/7/Cconnection.

Note: The effect of a temperature gradient may be ignored

1