Reaction of Fluctuate Embankment Fill on RCC Box type Cross Drain

摘要

The cross drain (CD) structure near to upcoming over bridge is falling under upcoming approaches and structure is loaded due to additional fill. The aim of this paper is to compare the overburden effect (up to 6m) on the CD by using two dimensional analysis in STAAD_Pro_V8i and excel spreadsheet. Thirteen models of 1.5m × 1.5m size of CD are analyzed and study the effect of an overburden on the axial and shear force, safe bearing capacity (SBC), sagging and moments and steel requirement. All stability check as per Indian Road Congress standard are satisfied. It is seen that the uniform 0.2m thickens is required for all component of CD up to 6m overburden. Also found that the required quantity of steel is about 77 kg/m~3 for no cushion, 50 to 76 kg/m~3 for the cushion of 0.5 m to 5.5 m and 80 kg/m~3 at 6 m cushion to resist all the induced forces and moments. It is observed that the requirement of SBC at a 0 m and 6 m cushion are 70 kN/m~2 to 150 kN/m~2 respectively. It is noted that, if a height of the cushion is an increase about a 1m then live load distributed over the large area and which caused a reduction in mid span moment at certain extent. However, more than 1m depth, caused more mid span moment due to superimposed load. It is finally concluded that an effect of depth of the cushion is governing after 5m. That means no cushion case is performed as same there who have 5m depth of the cushion in identical SBC.