why it was an important and one from the requirements to install movement joints when designing a water storage tank? .. whats happened if we don't install???
When one designs a concrete water storage tank, it's essential to install movement joints to control the movement due to variation of temperature, shrinkage and hydration temperature drop etc.
Thanks Mohannad H. Al-Sherrawi ......... You are right.. But does your answer include all types of storage tank (Above and under ground)... ? you know under ground storage tank has almost constant temperature variation...
In designing water storage tanks, movement joints can be installed in parallel with steel reinforcement. To control the movement of concrete due to seasonal variation of temperature, hydration temperature drop and shrinkage etc. two principal methods in design are used: to design closely spaced steel reinforcement to shorten the spacing of cracks, thereby reducing the crack width of cracks; or to introduce movement joints to allow a portion of movement to occur in the joints. For water-retaining structure like pumping stations, the crack width requirement is even more stringent in which 0.2mm for severe and very severe exposure is specified in BS 8007. It turns out to a difficult problem to designers who may choose to design a heavy reinforced structure. Obviously, a better choice other than provision of bulky reinforcement is to allow contraction movement by using the method of movement joints together with sufficient amount of reinforcement. For instance, service reservoirs in Water Supplies Department comprise grids of movement joints like expansion joints and contraction joints.
I think it is prefers to do so to avoid environmental impacts, vibrations and extension of bases due to heat, air masses and earthquakes
In the design of water storage tanks, joints of motion can be installed to control concrete movement due to seasonal temperature change, low water temperature, shrinkage, etc. The use of movement joints to allow part of the movement occurs in the joints to avoid the occurrence of different cracks.
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