A Study Of Structural Behaviour OF Rising Mains Due To Dynamic Loads

The mutual interaction between soil and structures is one of the important topics which have an effect on structures, whether they are hidden in the soil or above the soil surface. Among the structures hidden in the soil are the rising mains springing from lifting stations, whether they are water supply stations or sanitary pumping stations. One of the phenomena that have an effect on the rising mains is water hammering.The purpose of this thesis is to study the structural behavior of the rising mains under the influence of the dynamic loads resulting from water hammer in case of sudden cut-off of the electric current or stopping in pumps…. The effect of mutual interaction between the soil and the rising mains is also considered. In this thesis, different types of mains e.g. (R.C., D.I., and G.R.P.) were investigated. Diameters of mains were changed also (D=500, 1000, 1500 mm) and different types of the soil surrounding the mains (Es = 350, 1400, 3000 t/m2) were also investigated. A combination of all these variables was made to obtain different models (108 model) by fixing the soil burial depth and the value of the load above it. The amount of the dynamic load resulting from the water hammer was also changed, as measured by bar (P=6, 8, 10, 12 bar