CONDITION OF REINFORCED CONCRETE TANK CONSTRUCTIONS FOR STORING OIL AFTER LONG OPERATION

AbstractThe article presents problem of non-uniform foundation of structures in weak wet subsoil. The problem is illustrated with the case study of two-chamber-reinforced concrete water tank constructed in 1920s of 20th century, which cracked during construction. Under part of foundation, where the peat was found, the concrete piles were introduced.The results of five-year measurement of crack widths with crack gauges and geodesic measurements of vertical displacement of tank were presented. These results indicate that the tank is not stable and part of broken tank supported on piles is movable.On the basis of the presented data, the general conclusions concerning the non-uniform founding of tanks are formulated.

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Leakproofness of the reinforced concrete tank for water with a capacity of 45000 m3

MATEC Web of Conferences ◽

10.1051/matecconf/201928406006 ◽

2019 ◽

Vol 284 ◽

pp. 06006

Author(s):

Y. Minch Maciej ◽

Andrzej Kmita

Keyword(s):

Reinforced Concrete ◽

Technical Condition ◽

Clean Water ◽

Water Tank ◽

Reinforced Concrete Structure ◽

Expansion Joints ◽

Total Capacity ◽

Concrete Tank ◽

Financial Losses ◽

Level Analysis

The clean water tank discussed consists of four reinforced concrete tanks. The structure is symmetrical for each of the tank pairs, which consist of two storage tanks and two water transfer tanks for the water supply network. All chambers are technologically connected with each other. The tanks are partially recessed in the ground, monolithic, and completely roofed. The projection of chambers within external walls is 96 x 96 m = 9,216 m2. The total capacity of internal chambers and external chambers is about 45,000 m3. The clean water tank was made as a reinforced concrete structure, monolithic. The owner of the facility observed significant losses of stored water, which translated into large financial losses of the company. In order to determine the current technical condition of the reservoir and the causes of its leakage, a comprehensive, multi-level analysis was carried out in terms of strength, stability and durability of the structure. A few dozens of samples were taken at random, and the compressive strength of the concrete, modulus of longitudinal deformation and degree of carbonatization were evaluated. For the assessment of the technical condition of the expansion joints, boreholes were also drilled through them. On the basis of the results obtained from the tests, numerical analysis of the stress on the structure and its deformations was performed in order to select the most stressed areas as well as to assess expansion deformations as potential spots of the largest leaks. The results of the analysis were used to prepare the concept of sealing repairs of the tank chambers.

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Reinforced concrete tank walls and bridge abutments: Early-age behaviour, analytic approaches and numerical models

Engineering Structures ◽

10.1016/j.engstruct.2014.11.031 ◽

2015 ◽

Vol 84 ◽

pp. 233-251 ◽

Cited By ~ 23

Author(s):

Barbara Klemczak ◽

Agnieszka Knoppik-Wróbel

Keyword(s):

Reinforced Concrete ◽

Numerical Models ◽

Early Age ◽

Bridge Abutments ◽

Concrete Tank

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Concrete material characterization reinforced concrete tank structure Multi-Function Waste Tank Facility

10.2172/72878 ◽

1995 ◽

Author(s):

B.V. Winkel

Keyword(s):

Reinforced Concrete ◽

Material Characterization ◽

Concrete Material ◽

Concrete Tank

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Probability analysis of an embedded water tank

MATEC Web of Conferences ◽

10.1051/matecconf/202031000014 ◽

2020 ◽

Vol 310 ◽

pp. 00014

Author(s):

Katarína Tvrdá

Keyword(s):

Reinforced Concrete ◽

Probabilistic Method ◽

Limit State ◽

Probability Analysis ◽

Probabilistic Methods ◽

Water Tank ◽

Building Structures ◽

Load Pressure ◽

Concrete Tank ◽

Building Standards

The design of building structures must fulfil specific regulations, in our case, different building standards, among them Eurocodes. In addition to deterministic procedures in structural design, these standards also allow probabilistic procedures. The embedded tank loaded with soil and liquid is solved by the probability analysis using ANSYS, which contains several probabilistic methods. The reinforced concrete tank is solved by the RSM probabilistic method, which uses the well-known Monte-Carlo method in the background. Input parameters (material properties of soil and reinforced concrete, load - pressure from water, geometric data - change of both wall and tank bottom thickness) are entered into the calculation with certain aberrances allowed by standards in the construction and loading of structures. The results are also sets of probabilistic variables with a certain variance, as opposed to a deterministic calculation, where only one value results. These procedures, which use statistical methods, have been at the forefront in recent decades. At the end of the paper, some results of the analysis of embedded reinforced concrete water tank (deterministic and probabilistic procedure) in state of tank failure on the second limit state are presented.

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Concrete Tank Failure as the Result of Implementing Wrong Boundary Conditions for Wall Support—Case Study

Materials ◽

10.3390/ma14102474 ◽

2021 ◽

Vol 14 (10) ◽

pp. 2474

Author(s):

Łukasz Drobiec ◽

Jan Gierczak ◽

Rajmund Ignatowicz ◽

Piotr Kozioł ◽

Tomasz Nowak

Keyword(s):

Reinforced Concrete ◽

Boundary Conditions ◽

Sewage Treatment ◽

Sewage Treatment Plant ◽

Treatment Plant ◽

Small Error ◽

Concrete Wall ◽

Leak Testing ◽

Concrete Tank ◽

Non Destructive

Damage to large reinforced concrete structures is rarely due to design errors. Sometimes, however, a small error can lead to major damage and costly repairs. The article describes the damage, the results of non-destructive and destructive tests, the results of numerical calculations, and the method of repairing a reinforced concrete tank in a sewage treatment plant. The failure was caused by applying the wrong boundary conditions to the reinforced concrete wall support inside an existing biological reactor. During leak testing, one of the new walls cracked and was displaced, which resulted in the tank leaking. An inspection of wall damage and displacement was carried out on termination of the leak testing and while the tank was draining. The causes of the failure were determined based on the inventory information and numerical simulations. Both non-destructive tests of reinforcement and concrete and destructive tests of concrete were carried out. The concrete class of the foundation slab was determined based on a compression test of sample cores obtained from drilling. The aim of the non-destructive tests was to indicate the location and diameter of reinforcement in the damaged wall using electromagnetic and radar methods, as well as the location of internal defects using ultrasonic and radar methods. It was found out that the failure was a result of an incorrect determination of the anchoring length of the reinforcement. Based on the analysis, a plan to repair the damaged wall was formulated and then successfully implemented. In the article the authors proposed the IVD (identification-verification-design) scheme to make the design easier in similar cases.

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