Movable Bridges, Volume 2

Front Cover
J. Wiley & Sons, Incorporated, 1927 - Bridges, Movable
 

Contents

Resistance to turning a swing span with equal arms against a wind of know velocity
14
Resistance to turning a swing span with unequal arms against a wind of known velocity
16
Relations of velocity time and space
17
Application of Arts 2 5 and 7 to an actual swing span
19
Application of Arts 3 5 and 7 to an actual swing span
27
Summation of the results from Arts 8 and 9
30
Minimum time for raising or lowering a verticallift span a given distance with a given horsepower
32
Application of Art 11 to a verticallift span
34
CHAPTER III
40
ARTICLE PAGE 3 Turning machinery for a highway swing span
42
Middletown Bridge N Y N H H R R 46 1
46
Kinzie StreetKinnickinnic center and rimbearing draw bridge
55
Turning machinery of a modern center and rimbearing swing span
59
Chicago Type bascule bridge Operating machinery
62
Strauss bascule bridges
69
Verticallift bridges
77
CHAPTER IV
78
Bearing metals General
79
Cast iron
80
Bronze
81
White bearing metals
82
Antimonylead alloys
84
Antimonyzinctin alloy
85
The physical properties and strengths of metals and alloys
86
CHAPTER V
90
Highpressure bearings
91
Examples of highpressure bearings
94
Turning resistance of swing bridges
95
Machinery resistances for use in design
98
Motors and engines
99
Torque of a directcurrent electric motor
100
Torque of alternatingcurrent motors
102
Torque of a gasoline engine
103
Torque of a steam engine
105
Torque for manpower
106
CHAPTER VI
107
CHAPTER VII
112
Materials and general proportions of shafts
113
Torsional moments and deflections
114
Combined bending and torsional moments
115
Horsepower transmitted by shafts
116
Hollow shafts
117
Steelshaft charts
118
Impact and fatigue
120
Allowances for running fits of shafts
125
Application of Art 14 to shafts
128
Couplings
129
Doublecone vise couplings
131
Keys
132
CHAPTER VIII
135
Location of bearings
136
Bearings
138
Lubrication of bearings
141
Pivot bearings
142
Collar bearings
143
Roller bearings
144
General note
145
CHAPTER IX
146
Strength of spurgear teeth
147
Strength of bevelgear teeth
149
Unit stresses
150
Values of y
152
Grants Odontograph
154
Proportions of gear teeth
158
Arms of gear wheels
164
Theory of screws and nuts
178
Theory of Acme screws
179
Friction of screws and nuts
180
CHAPTER X
182
Overhanging cranks
183
Helical springs
184
CHAPTER XI
187
Stresses
188
Design in detail
190
Material and manufacture
193
CHAPTER XII
195
Construction
196
Bending stresses
197
Ultimate strength of wire ropes when bent around sheaves
199
Elongation of wire ropes
204
Lubrication of wire ropes
205
CHAPTER XIII
206
Kinetic energy dissipated by brakes
207
Brake blocks and linings
208
Types of brakes
210
Singleblock brakes
211
Doubleblock brakes
215
Simple band brakes
218
Compound and differential band brakes
221
Friction of bands
223
Band or block brakes with Vshaped groove in the brake wheel
224
Comparison of the efficiency of brakes
226
CHAPTER XIV
227
Spheres with thick walls
229
Hydraulic stuffing box
230
Hydraulic gland with cup packing
231
Friction of hydraulic plunger packing
233
Packing for hydraulic pipejoints
236
Loss of hydraulic pressure in straight pipes
238
Loss of hydraulic pressure in 90 bends
239
Loss of hydraulic pressure at entrance orifices
240
Limits of the applicability of Arts 11 to 14
241
APPENDIX A SPECIFICATIONS FOR MOVABLE BRIDGES SECTION 1 General design
245
Details of design
247
Operating Machinery details of design
250
Sheaves wire ropes and attachments
253
Power equipment
256
Loads and stresses
262
Unit stresses
267
Materials
273
SECTION PAGE 9 Workmanship
275
Erection
278
Index
279
APPENDIX B SHEAVES LOADED BY ROPES UNDER TENSION ARTICLE 1 Theory
284
Example
285
Stresses in the arms and rim of a counterweight sheave
286
Forced fits of hubs on trunnions or shafts
291
APPENDIX C
294
Mensuration
306
Centroids
313
Centers of gravity
317
Elements of lines
320
Elements of sections
321
Polar elements of sections
329
Elements of solids
331
Polar elements of solids
333
Miscellaneous data
334
INDEX
337
Copyright

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Page 74 - AMERICAN SOCIETY FOR TESTING MATERIALS EXTRACT FROM CHARTER 1. The name of the proposed corporation is the "American Society for Testing Materials." 2. The corporation is formed for the promotion of knowledge of the materials of engineering, and the standardization of specifications and the methods of testing.
Page 248 - Art. 508, two others shall be selected and attached to another piece of rope and the test repeated...
Page v - Club (students interested in writing) ; student branches of the national engineering societies, the American Society of Civil Engineers, American Society of Mechanical Engineers, American Institute of Electrical Engineers; American Institute of Mining and Metallurgical Engineers; Social Science Club; Italian Club; Chess Club.
Page 255 - Members subject to alternate stresses of tension and compression, due to the combination of dead, live, impact and centrifugal stresses shall be proportioned for the kind of stress requiring the larger section. If the alternate stresses occur in succession during one passage of the live load, each shall be increased by 50 per cent of the smaller. The connections of such members shall be proportioned for the sum of the net alternate stresses not so increased.
Page 302 - V=% volume of hemisphere of same base and perpendicular height Frustum of Pyramid or Cone, Right and Regular, Parallel Ends S =(sum of perimeter of base. P, and top, p) x...
Page 255 - Combined Stresses. — Members subject to both axial and bending stresses shall be proportioned so that the combined fiber stresses will not exceed the allowed axial stress.
Page 255 - Members subject to both axial and bending stresses (including bending due to floor beam deflection) shall be proportioned so that the combined fiber stresses will not exceed the allowed axial stress. In members continuous over panel points, only three-fourths of the bending stress computed as for simple beams shall be added to the axial stress.
Page 299 - Ellipse: Long diameter x short diameter x 0.78540 Parabola : Base x % perpendicular height. Irregular plane surface. Divide any plane surface A, B, C, D, along a line...
Page 242 - C concrete shall be made of 1 part of cement, 3 parts of sand and 6 parts of broken stone or gravel. Broken stone for Class C concrete shall be the run of the crusher that will pass through a screen with circular openings...
Page 250 - In the engine room, there shall be a steel water tank of sufficient capacity, a duplex steam boiler feed pump, and an injector for each boiler, with necessary pipes and connections for feeding boilers separately or together. Steam water lifters with necessary strainers, flexible hose, and piping to lift the water from the river into the tank shall be provided where the river water is fit for boiler use.

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