Calculation of monolithic rectangular water tanks taking into consideration cracks formation
Calculation of rectangular water tanks is usually performed without consideration of redistribution of stresses as a result of cracks formation in the walls,coating and bottom. As investigations have shown, this factor significantly affects the internal stresses and consumption of armature. The article describes the method of calculation taking into account redistribution of stresses connected with formation of cracks. The calculation was performed using a method of finite elements using the iterative approach on the software system «LIRA-CAD 2013». The first iteration refers to the tank work when it is not cracked. After performing of the static calculation there are identified the areas in the walls,covering and bottom where cracks were formed. For these fields clarification of the cross sections rigidity is performed calculated with consideration of the formed cracks. There is fulfilled a second calculation of the tank under a new distribution of rigidities. So the calculation is performed until the results of the calculation iterations are practically identical to the results of the previous iteration. There is given an example of the calculation which is performed for a monolithic rectangular tank of height 4,8 m.