SURCHARGE PRESSURE ON BACK OF BRIDGE ABUTMENTS

Abstract

Indian toad Congress has specified certain equivalent height of surcharge of earth for calcu.atiofl of moment at the base of ab.. utments due to live load on its back which have been recom ended for use in this country. These curves of equivalent. surcharge ieigiits are based on tho $,prior's Equati+cns The author has reviôuoI the literaturo on the affect of tone. oentrated surface loads due to whools on a retaining tail., Particular rnentionis made of conventional theories Sp filer's toot, Stockholm tests and toots conducted by' P.t . Rom, Inspito of. the above test ro. suits, the lack of sufficient porimontal data is striking in this field* It has been observed that the present specifications are not on rational basis and toed modit cation. The author has prepared the curves for total vertical ; pressure, Its point of application, total horizontal pressure and its point of application for various heights of a' tment and various types of 1. 4 °standard vehicles. The mods.. fled pang er'e formula has been used for calculations.