Design Of Radial Gate and Its Piers

Abstract

One of the Prime necessity of a Water Storage Scheme is the amount of water it can store and its flexibility in handling the instantaneous fluctuation of water during high floods. Such schemes are, therefore, supplemented with Gates. Gates not only increase the water storing capacities of Dams but also help in releasing excess water in the times of high floods thus saving the total Dam structure from failure. This Project deals with analysis, design, and detailing of radial gates subjected to water loads. The Programming is carried out in C++ language for the analysis and design of Radial gate. The design of radial gate mainly involves design of skin plate, horizontal girders, radial arms and trunnion. The design is carried out for FRL and then sections obtained are checked for HFL, Hydrodynamics Pressure etc. with increase in permissible stresses by 33% as per the provision of BIS.The Program gives output in terms of section sizes and stresses they carry. Greater care has to taken in deciding the location of horizontal girder so that they carry almost equal horizontal forces, thus resulting into economical design of girder. Radial Arms are designed as compression members and the bracing are designed for carrying 2.5% loads on the arms carry. This is also done in C++ language. The radial arm, in turn, transfers the loads to trunnion girder via trunnion bracket. It is basically a design of steel connection and same is carried out in Excel, using welding application. The second part of design consists of design of Pier and its footing, that carry loads from Gates. Apart from this, Pier carries live loads, weight of bridge and hoisting platform. Pier is generally found critical in transverse direction, when one adjoining gate is closed and other is kept open. Pier is designed for biaxial eccentricity. Steel Reinforcement is designed along the periphery of the pier to take care of stresses at crest level. This is also done in MS Excel, in this project. As Pier is tightly supported at crest level, till foundation level, by spillway, it is designed as footing subjected to uniaxial eccentricity along the length of the pier. The bearing capacity of the soil underneath is assumed as 30t/m2. Various parametric studies, along with case study, are carried out to check the authencity of program prepared. Results are also checked with results of STAAD PRO. Thus this program would be a helping hand in taking preliminary decisions and accordingly, it will help in carrying out design speedily, accurately and economically.