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J.A.L. Waddell — INDEX — Bridge Engineering |

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## EEads Bridge, St. Louis, 25, 27, 620, 621 estimate of cost of, 1351-1353 Earning capacity, reports on, 1574 Earth, dams, 973 embankments, 1865 resistance, experiments on, 966 thrust, 1034 weight of, 96 East Dart Bridge, 5 East Omaha Bridge, 694, 607, 1174 driving piles for, 1016 piers, 1027 righting of, 1073 protection, 1063 temporary layout for, 1073 Eccentric loads, base plates and shoes, 304-309 pile groups, Eqs. 24 and 26, page 300 rivet groups, 298-301 stresses in anchor bolts from, 304-309 Eccentricity at joint, effect of, 205 Eccentricity of chord pins, effect of, 340 Eccentricity of track, effect of, 132 Economic comparisons, arches and girders in reinforced-concrete construction, 1205 bascules and vertical lifts, 1208 cantilever and suspension bridges, 1206, 1207 designs, 1182 steel and reinforced-concrete bridges, 1205 wooden and reinforced-concrete floors, 1205 Economic criterion, 1189 Economic depths, cantilever bridges, 589 stiffening trusses, 655 Economic lengths, anchor-arms, 1199 anchor-spans, 1200 panels, 1187 reinforced-concrete trestles, 1191 spans, 1187 suspended span, 1198 Economic questions, minor, 1192 Economic span lengths, reinforced-concrete trestles, 1327 steel railway trestles, 1259 Economics, alloy steels in bridgework, 79, 80 approaches to bridges, 1193 arches, 636, 1191 as affecting layout, 1217 bridge repairs, 1525 cable rise, 656 cantilever bridges, 1198 cantilevers, 570, 580, 581, 585, 591 column spacing, 1194 elevated railroads, 1189 erection considerations, 1201, 1204 half-through plate-girder spans, 410 I-beam spans, railway, 410 medium steel, 1200 movable spans, 1208 plate girders, 1184, 1185 plate-girder spans, railway, 409, 410 reinforced-concrete bents for steel trestles, 1205 reinforced-concrete bridges, 1189 silicon steel, 89 simple trusses and cantilevers compared, 1200 standard and least expensive sections, 1201 superstructure design, 1182 swing spans and bascules, 1208 swings and vertical lifts, 1208 trestles, 1189 trusses with parallel chords, 1183 trusses with polygonal top chords, 1184 vanadium steel bridges, 86 Economy in bridge design, , 1182 Economy in designing combined bridges, 344 Economy, study of 1629 Eddies, 962 Edges, sheared, 1780 Effective bearing areas, 1658 Effective depths, 1640 Effective lengths, 1639 reinforced-concrete structures, 960 Efficiency, functional, 1162 Efficiency of two-angle sections, 293 Egyptian bridges, 9 Ejection of fine material from caissons, 999 Elastic arch, 11 theory of, 15 Elastic limit, 265 Elasticity (coefficients of) for concrete and stone, 959 Electric, brakes, 1705 cables, 1795 furnace at South Chicago, Illinois, 77 Worcester, Massachusetts, 77 lights, 1177 motors, 1702, 1703 alternating-current, 1793, 1794 direct-current, 1793 operation, movable bridges, 1702-1708 power wiring and electric cables, 1795 process for steel, 76 steel rails, 77 steel, status of, 78 Electric railway bridges, live loads for, 107 Electric railway tracks, superelevation for, 134 Electric railway trestles, weights of metal in, 1269 Electric siren, 1801 Electrical equipment, 1792 Electrical operation of draw bridges, 679 Electro-metallurgical process of manufacturing steel, 72 Elevated railroads, 548-567, 1685 anchorages for, 551 columns, types of, 552 crimping of web stiffening-angles for, 552 depths of girders for, 558 details of, 560-563, 1683, 1684 distance between expansion points in, 552 economic span lengths of, 551, 567 economics of, 1189 elevators for, 549 escalators for, 549 expansion girders for, 563 expansion pockets for, 565, 566 faults in existing, 553-557 girders, types of, 552 latest improvements in, 559 layouts for, 1372 live loads for, 550 locations of platforms on, 549 paper on by author, 549 pedestal caps for, 551 pedestals for, 562 rapid transit on, 548 stations for, 549 superelevation on curves in, 552 Elevations, 1471 tops of pier bases, 1051 Elevator, hydraulic, 992 Elevators for elevated railroads, 549 Ellet, Charles, 21 Ellipse of elasticity, method of arch design, 863 Elliptical ribs for reinforced-concrete arches, 872 Embankments, earth, 1865 pavement and curbs on, 1837 Emphasizing functions of parts of structures, 1154 Employees, duties of, 1630 insurance of, 1609 retaining of, 1609 selection of, 1608 treatment of, 1607 Encasing of metal in concrete, 769 Encasing pile heads, 968 Encountering obstacles, 1860 End bearings. End bracing frames, 394 End cross-frames in viaducts, 338 End details, plate-girder spans, 441-447, 464, 467, 1670 connection angles, end, 444-446 setting to exact position, 444 stiffeners over bearings, 446, 447, 1670 through railway spans, 464, 467 End floor-beams, 293, 1641, 1642 connections, 399 End lifts for swing-spans, 695, 1717 machinery for, 1724 End post, bending on, 1660 sections for, 492, 498, 1675, 1681 End shears, plate-girders, calculation of, 412, 414, 416 Endorsement of assistants, 1627 Engine service, 1754 Engineer, definition of, 1886 Engineering, contracts, 1557 ethics, 1619 fees on bridgework, 1601 Engineering of construction, 1466 "Engineering Specifications and Contracts," 1557 Engineer's field office, 1768 Engines, gasoline, 1708, 1802 Enlargement, future, as affecting layout, 1215 Enlarging pier bases, 971 Ensink, J., 634 Entering connections, 335 Equalizers, 693, 1719 levers and pins, 1792 Equalizing stresses due to curvature, 146 Equilibrium of soils, 1010 Equipment, core drilling, 1098 erection, 1507 field engineer, 1488, 1489 machinery, 1708 power, 1702-1708 wash borings, 1094 Equity, 1589 Equivalent total first cost, 1182 Equivalent uniform live loads, diagrams for, 105, 106, 111-116, 166 floor-beams, 168 stringers, 166 trusses, 168 Erasures in contracts, 1570 Erection, affecting economics, 1204 arches, 618 barges for, 1849 cantilever method of, 31, 1503, 1504 City Waterway Bridge at Tacoma, 1075 considerations as affecting layout, 1216 designing for, 334 economics in, 1201 equipment, 1507 evolution of methods, 31 expenses, 1365, 1366 falsework, 1501 floatation method, 34, 1503, 1510 floating barges for, 1076 gallows frames for, 1512 launching, 1506 methods of, 1501 organization for, 1506, 1507 rolling lift bridges, 335 shelves, 330 specifications for, 1741 starting of, 335 steel, 1848 suspension bridges, 1506 Ericson, John, 716 Erosion of banks, 1059 effect of wave action on, 1059 Errors, connections, correction of, 1849 final position of piers, allowance for, 987 limits of, in structural steel, 1784 Escalators for elevated railroads, 549 Essential elements of contracts, 1558, 1559 Essential elements of plate-girders, 411 Estimates ( caution concerning, 1369 checking of, 1361 engineer of a bridge manufacturing company, 1364, 1365 final, 1483 guaranteeing, 1624 kinds made by consulting bridge engineers, 1362 liberality in, 1360 list of expenses for preparing, 1349 monthly, 1479-1483, 1489 railway profiles, as basis, 1361 requisites for preparing, 1348 time for completion, 1363 weights of metal, 279 Ethics, bridge engineering, 1619, 1621, 1622 code of, 1631 Ethiopian bridges, 9 Etruscan bridges, 7
Euboea Bridge, 6 Euphrates River Bridge, 9 European and American practice compared, 1181 Evidence of experience, 1878 Evolution, American bridge designing, 29 bridge engineering, 1 erection, 31 materials for bridges, 16 Examination of bridges, 1514 Examples of application of curves of bridge weights, 1292 Excavation, 1859 caissons and piers, 1000, 1001 cost of, 1354 inspection of, 1448 Excluder pigment, 765 Expansion, 275, 1067, 1644 concrete structures, 212 gap bar for rails, 356 girders in reinforced-concrete bridges, 937 lateral system, 1067 plates for floors, 374, 1836 pockets, 546, 1685 retaining walls, 1037 trestles, location of, 539 rollers for truss spans, 1679 Expedients, definition of, 1065 Expedients in designing and construction, 1065 Expense items, bridge project, 1349 erection, 1365, 1366 estimates of an engineer of a bridge manufacturing company, 1364, 1365 substructure construction, 1366, 1367 Experience, evidence of, 1878 Experiments on earth resistance, 966 Expert bridge engineer, 39 Expert services, 1627 Expert testimony, 1624 Extension plates, tables for, 310 Extensometer, 122 Extra cost of wide plates, 327 Extras, 1565 Eye-bars, 1785 heads, 1683 Mayarí steel, 70 tests of, 1775 |