Technical investigations: Bull.1. Trial load method of analyzing arch dams. Bull.2. Slab analogy experiments. Bull.3. Model tests of Boulder Dam. Bull.4. Stress studies for Boulder Dam. Bull.5. Penstock analysis and stiffener design. Bull.6. Model tests of arch and cantilever elements |
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... important . During recent years millions of dollars have been spent in mitigating the evils of silt deposition and in protecting the highly cultivated Imperial Valley lands from annual threats of inundation . The need for a ...
... important . During recent years millions of dollars have been spent in mitigating the evils of silt deposition and in protecting the highly cultivated Imperial Valley lands from annual threats of inundation . The need for a ...
Page 1
... Importance of supplemental effects 18 19 8 Temperature effects 9 Procedure TRIAL LOAD ANALYSES IN DAM DESIGN 10 Design considerations 2220 21 TRIAL LOAD CALCULATIONS 11 General methods 12 Notation 223 22 23 USE OF THE METHOD 13 Trial ...
... Importance of supplemental effects 18 19 8 Temperature effects 9 Procedure TRIAL LOAD ANALYSES IN DAM DESIGN 10 Design considerations 2220 21 TRIAL LOAD CALCULATIONS 11 General methods 12 Notation 223 22 23 USE OF THE METHOD 13 Trial ...
Page 16
... important in some of the older structures , is gradually becoming less important , due to recent researches in design of concrete mixes together with improvements continually being made in methods of manufacturing and placing concrete ...
... important in some of the older structures , is gradually becoming less important , due to recent researches in design of concrete mixes together with improvements continually being made in methods of manufacturing and placing concrete ...
Page 17
... important in either arch or cantilever elements . As regards assumption 11 , recent results of laboratory investigations indicate that , for stresses lower than those usually permitted in dam design , concrete flow is substantially ...
... important in either arch or cantilever elements . As regards assumption 11 , recent results of laboratory investigations indicate that , for stresses lower than those usually permitted in dam design , concrete flow is substantially ...
Page 18
... importance of the effects usually varying with the size and height of structure . Effects of including radial shear in calculating arch deflections were found particularly important in thick arches , as would naturally be expected , the ...
... importance of the effects usually varying with the size and height of structure . Effects of including radial shear in calculating arch deflections were found particularly important in thick arches , as would naturally be expected , the ...
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Common terms and phrases
analyzing angle angular movements applied arch abutment arch and cantilever arch center line arch constants arch dams arch elements arch load arch point B₁ B₂ bending bending moment Boulder Dam C₂ calculated cantilever elements center of gravity chapter circular arches concrete cos² CRACKED CANTILEVER curves D-terms D₁ deflections due deformations downstream face effects elastic elevation equations extrados fillet forces and moments formulas horizontal element horizontal plane horizontal section load constants M₂ modulus of elasticity nonsymmetrical Poisson's ratio radial deflections radial loads radial shear reservoir water Ro Raxis rotations shear stress sheet shown in figure sin² structure tangential deflections tangential shear Term 2ND Term Term IST Term thrust trial load analysis trial load method triangular loads trigonometric functions twist adjustment twist loads twisting moments uniform thickness UNIT ELEMENT unit loads unit radial upstream face values variable thickness arch voussoir ΕΙ ΦΑ Φι
Popular passages
Page 19 - The general effect of considering twist action is a decrease1 in radial deflections at practically all locations, a decrease in maximum arch stress, a decrease in cantilever stress at the downstream face of the dam, and an increase in cantilever stress at the upstream face of the dam.
Page 19 - ... changes in vertical sections cause negligible horizontal movements. Increases in temperature in the arch elements work against the water load and were neglected except for the case of minimum water level. Decreases in temperature in the arch elements work with the load and were included in the analysis. The maximum probable decrease in temperature below the temperature existing at the time of grouting the joints is the change which was included in the stress analysis. The vertical joints were...
Page 198 - Thus the maximum shearing stress acts on the plane bisecting the angle between the largest and smallest principal stresses and is equal to half the difference between these principal stresses. If we compute the normal stresses on these planes and designate them by...
Page 13 - ... each horizontal element ; and that the true division of load is the one which causes equal arch and cantilever deflections at all points in all arches and cantilevers, instead of at the crown cantilever only. Furthermore, the...
Page 142 - A nonsymmetrieal areh of uniform thiekness is eneountered only if it is desirable to have the erown of the arch coincide with the maximum cantilever section, or if abutment yielding conditions are different on the two sides of the canyon. Otherwise the crown is placed at the middle and the arch is analyzed as symmetrical. A nonsymmetrical arch will obviously have nonsymmetrical loads, requiring separate calculation of loads on both sides of the arch. The general computation forms with no omissions...
Page 141 - The advantage of this operation is that one set of arch constants can be used for the computation of these loads and the nonsymmetrical loads. In using computation forms for the analysis of nonsymmetrical triangular and concentrated loads on symmetrical arches, many computations are omitted. These are briefly listed as follows : Sheet 1. — All arch constants, trigonometric functions, coordinates, and abutment movement functions for the right side of the arch, because they are the same as on the...
Page 19 - The general result of considering tangential shear in trial load analyses is a decrease in radial deflections near the crown section, an increase in radial deflections near the abutments, and a slight increase in arch stresses at the abutments without appreciable stress changes at the crown. The importance of tangential shear effects varies primarily with the ratio of length of dam to height.
Page 29 - Water Pressures on Dams During Earthquakes," Trans. Am. Soc. CE, vol. 98, 1933, pp. 418-472.
Page 115 - The contribution of a voussoir to an arch constant at a point is the product of the multiplier for that voussoir, in terms of...