ICE - Institution of Civil Engineers - Virtual Library

Coulomb's analysis of soil thrust J. Heyman, FSA, FICE, FEng j Coulomb's famous memoir was published 1,2 it was not the rst over 200 years ago: time that thrust against a retaining wall had been calculated, but Coulomb's analysis laid the foundations of the modern science of soil mechanics. Indeed, the work foreshadows in a remarkable way some of the ndings of modern plasticity theory. However, soil was treated by Coulomb as a single-phase material, having two physical parameters cohesion and friction: 3 Terzaghi's introduction of a third variable pore water pressure radically altered theories of geotechnical engineering...

'' The Problem of the Thrust Bearing." By HENRY THORNTON NEWIBIGIN, AsSoc. M. Inst. C.E. TEE ordinary pivot or collar thrust bearing is well known t o be rery ineficient as compared with an oil-lubricated journal bearing. It has a much higher frictional loss,, combined with a lower carryingcapacity. The object of this Paper is to show how this difference is to be accounted for and how it may be overcome. The journal bearing in its simplest form is merely a round shaft revolving in a cylindrical support...

Procceding~.] DISCUSSION ON THE THRUST BEARING. 247 Discussion. The CHAIRMAN, moving a vote of thankstotheAuthor, in Thechairman remarked that The Institution was much indebted to him for having brought before it a difficult and complex problem, and for having shown to what extent he and others had solved it by their researches and experiments. H e hoped that those who had carried out similar experiments would give the members the benefit of their experience. Mr. W. H. ELLIS shared the Chairman's view that The InstitutionMr. Ellis...

Proceedings.] DISCUSSION ON THE THRUST BEARING. 257 t o 11", due to the The Author. correct pivoting of the block. The blocks were tested by means of a thermometer inthe blocks themselves-that was, a hole was drilled in the block so that the actual temperature was obtained as near the face as possible. The bearing was running a t 1,750 revolutions per minute, and the load on the blocks was 500 lbs. per square inch. The explanation of a block pivoted in front of the theoretical point working a t all was probably that the rise in temperature in the oil-film passing under theblock reduced its viscosity and thereby its ability to support the trailing edge...

350 G . H. DARWIN` ON THRUST OF MASS OF SAND. [Selected (Paper No. 1904.) " On the Horizontal Thrust of a Mass of Sand." By GEORGE HOWARD DARWIN, M.A., F.R.S., Formerly Fellow of Trinity College, Cambridge. 1. ACCOUNT EXPERIMENTS. ov THEpressure of loose earth against revetment-walls is asubject which is frequently being brought in a practical manner under the notice of engineers. A considerable number of theoretical investigations have been published by Coulomb, Rankine, LBvy, Boussinesq, and others, on this subject, but it appears that there is a singular deficiency of experimental data for testing the accuracy of the results of theory...

168 HILL ox THRUST OF FLUID-PRESSURE IN BEND-PIPES.[Selected (Paper No. 2724.) The Resultant Thrust of Fluid-Pressure in Bend-Pipes." By EIEXEST PRESCOT Assoc. M. Inst. C.E. HILL, THEordinary methodfor ascertaining the magnitude and direction of the force tending to drive off abend on a line of pipe subjectedto internal fluid-pressure isbytheconstruction of a diagram of forces-the resultant force in the straight on either pipe side of the bend being equal to the area A of the pipe, multiplied by the intensity p of the fluid-pressure, and acting axially ; the resultant of these two forces is A X p X 2 sin -, where 8 is the 2 angle subtended by the bend...

Paper No. 6724 ADESIGN CHARTFORRECTANGULARREINFORCEDCONCRETEMEMBERSSUBJECT TO MOMENT AND THRUST bY Reginald George Robertson, M.A., M.I.C.E. Professor of Civil Engineering, University of Cape Town Not for discussion ALLreinforced-concrete frames contain members subject to moment and thrust, which seldom require equal reinforcing in each face. 2. The B.S. Code of Practice No. 114gives the principleswhich govern the design of rectangular members, but deals only with members reinforced equally in each face. 3. The equations for any amount of reinforcing steel in each face are as follows : Let X be depth of stress block as a ratio of cfl...

SELECTED ENGINEERING PAPERS. BEING ORIGINAL COMMUNICATIONS TO BE ORDERED PUBLISHED WITHOUT BY THE COUNCIL DISCUSSION. No. 133. THE GRAPHICAL DETERMINATION OF EXPANSION THRUSTS AND STRESSES IN STEAM PIPES," " BY EDGAR BASIL COCKS, B.E., Assoo. M. INST.C.E. EDITED BY I. H. J E F F C O T T , Sc.D., B.A.I., Assoc. M. IXST.C.E., SECRETBRY. LONDON: VutIisteb &p Z~JE IEnstitution, GREAT GEORGE STREET, WESTMINSTER, 1932...

272 GAUDAILD OK THRUST OF A IIASS OF SAND. [Selected (Paper No. 1934.) 'L Note on ]Mr. G. H. Darwin's Paper On the Horizontal " Thrust of a Mass of Sand.' (Translated by F. G . DELANO.) By Prof. JULES GAUDARD, Lausanne. of referred to a new and interesting consideration in what he terms the "historical element," that is to say, the mode in which the molecules of the earthy mass aregrouped. His experiments lead him to conclude that the slipping of soils comports itself according to the older theory of Coulomb and of Poncelet, rather than to that of RankineandBoussinesq; that is to say, that instead of a continuous deformation of the entire mass, local cracks occur which break off a series of prisms, each of which falls by itself almost intact...