repair of hydraulic steel structures

... Corps of Engineers® ENGINEERING AND DESIGN Inspection, Evaluation, and Repair of Hydraulic Steel Structures ENGINEER MANUAL AVAILABILITY Electronic copies of this and other U.S Army Corps of Engineers ... environment of hydraulic steel structures but is not likely to cause significant structural degradation (2) Localized corrosion is the type of corrosion most likely to affect hydraulic steel structures ... Institute of Steel Construction 1989 American Institute of Steel Construction 1989 “Allowable Stress Design Manual of Steel Construction,” 9th ed., Chicago, IL American Institute of Steel Construction

Ngày tải lên: 27/06/2014, 05:20

... AND REPAIR OF HYDRAULIC STEEL STRUCTURES 1. Purpose. This manual describes the inspection, evaluation, and repair of hydraulic steel structures, including preinspection identification of critical ... number of cycles corresponding to Sri Sri = magnitude of a stress range block f Repeated loading for hydraulic steel structures The general function of hydraulic steel structures ... environment of hydraulic steel structures but is not likely to cause significant structural degradation. (2) Localized corrosion is the type of corrosion most likely to affect hydraulic steel structures.

Ngày tải lên: 27/06/2014, 14:20

... AND REPAIR OF HYDRAULIC STEEL STRUCTURES 1. Purpose. This manual describes the inspection, evaluation, and repair of hydraulic steel structures, including preinspection identification of critical ... discoloration of the paint and [...]... hydraulic steel structures The general function of hydraulic steel structures is to dam and control the release of water Sources of repeated ... environment of hydraulic steel structures but is not likely to cause significant structural degradation. (2) Localized corrosion is the type of corrosion most likely to affect hydraulic steel structures.

Ngày tải lên: 27/06/2014, 17:20

... AND REPAIR OF HYDRAULIC STEEL STRUCTURES 1. Purpose. This manual describes the inspection, evaluation, and repair of hydraulic steel structures, including preinspection identification of critical ... Periodic inspection. .. hydraulic steel structures The general function of hydraulic steel structures is to dam and control the release of water Sources of repeated loading include ... environment of hydraulic steel structures but is not likely to cause significant structural degradation. (2) Localized corrosion is the type of corrosion most likely to affect hydraulic steel structures.

Ngày tải lên: 27/06/2014, 17:20

... AND REPAIR OF HYDRAULIC STEEL STRUCTURES 1. Purpose. This manual describes the inspection, evaluation, and repair of hydraulic steel structures, including preinspection identification of critical ... environment of hydraulic steel structures but is not likely to cause significant structural degradation. (2) Localized corrosion is the type of corrosion most likely to affect hydraulic steel structures. ... stability, and serviceability of hydraulic steel structures must be evaluated. The major degrading effects of corrosion on structural members are a loss of cross section, buildup of corrosion products

Ngày tải lên: 05/08/2014, 11:20

... especially true of welds on riveted structures, since the structural steels typically used in older structures are not characterized as steels for welding. A discussion of structural steels used ... (3) Three types of mechanically assisted corrosion are also possible in hydraulic steel structures. (a) Erosion corrosion is caused by removal of surface material by action of numerous individual ... a certain number of load cycles, the accumulated damage causes the initiation and propagation of a crack. Although the number of load cycles experienced by hydraulic steel structures does not,

Ngày tải lên: 05/08/2014, 11:20

... function of hydraulic steel structures is to dam and control the release of water. Sources of repeated loading include changes in load due to pool fluctuations, operation of the hydraulic steel ... fatigue problems in hydraulic steel structures probably due to the low magnitude of stress range for normal conditions. 2-4. Design Deficiencies Many existing hydraulic steel structures were ... the hydraulic steel structures. In addition, thick castings such as sector gears used for operating such structures as lock gates may be susceptible to brittle fracture. Hydraulic steel structures

Ngày tải lên: 05/08/2014, 11:20

... ponding may occur and the location of web drain holes should be determined prior to inspection. (4) Seals on hydraulic steel structures are common locations of corrosion damage. Seals are subject ... periodic inspection of hydraulic steel structures, if necessary. These methods, discussed in Chapter 4, include dye penetrant, magnetic particle, or eddy-current methods for inspection of cracks, and ... web-to-girder welds. (7) Previous cracks repaired by welding. Figure 3-6 shows an example of cracks redeveloped at weld repairs. (8) Locations of previous repairs or where damage has been reported.

Ngày tải lên: 05/08/2014, 11:20

... and location of inspected structures, date and time of inspection, type of inspection, inspection procedure, inspection equipment, inspector identity and qualifications, and a record of discontinuities ... discontinuity can be seen as a shadow of different photographic density from that of the image of the surrounding material. Evaluation of the radiograph is based on a comparison of these differences in ... determine the extent of corrosion. Any failure of the paint system should also be identified. (b) The extent of corrosion at crevice sites, particularly in riveted structures, should be

Ngày tải lên: 05/08/2014, 11:20

... Behavior of Steel Materials a. The operating service temperature of a steel structure has a significant effect on the fracture behavior of the steel. For low- and intermediate-strength steels, ... cross sections. For hardness tests of existing hydraulic steel structures, the weld reinforcement may or may not be removed. When it is removed, a local area of the reinforcement is ground smooth ... expansion of the fractured specimen and appearance of the fractured surfaces, can also be used to characterize the fracture toughness of the test material. The amount of expansion on each side of

Ngày tải lên: 05/08/2014, 11:20

... permission of Prentice- Hall, Inc., Englewood Cliffs, NJ) where K T = theoretical stress concentration factor, a N = half of the long dimension of the ellipse, b = half of the short dimension of ... analysis (Barsom and Rolfe 1987). The CTOD method is the recommended method of EPFM analysis for evaluating hydraulic steel structures. The recommended procedure for cases where the applied stress ... direction, and P = effective dimension of the distance between the edge of component and edge of crack in the through-thickness direction Figure 6-4. Resolution of a discontinuity (after British

Ngày tải lên: 05/08/2014, 11:20

... 10 scale) of the rate of fatigue crack growth per cycle of load da/dN versus the variation of the stress-intensity factor ∆K I . The parameter a denotes crack length, N the number of cycles, ... of the critical crack length (i.e., employ a factor of safety equal to at least 2.0). b. In determining the recommended action for a distressed hydraulic steel structure, the redundancy of ... superimposed on the applied cyclic stress (American Association of State Highway and Transportation Officials 1996; American Institute of Steel Construction 1994; EM 1110-2-2105). (5) Integrate

Ngày tải lên: 05/08/2014, 11:20

... structural integrity of the spillway gate must be evaluated. (a) Since an evaluation of the local buckling of the strut arms was conducted when it was first observed and the amount of buckling on ... significance of these new vibrations. The results of the field study revealed that vibrations of approximately five cycles per second or Hertz (Hz) were producing cyclic stresses of up to 55.2 ... fracture toughness. A review of the hypothetical design documents indicated that the gate had been fabricated from A36 steel. Since K Ic testing (ASTM E399) of mild steels at reasonable service

Ngày tải lên: 05/08/2014, 11:20

... for structural steel had markedly improved and standardized. d. Weldability of earlier steels. (1) A very good reference that discusses the weldability of steels, including steels that have ... published for steel structural rivets, and superseded ASTM A141 and A195. The later version of this specification (ASTM A502) covers three grades of steel rivets: general-purpose carbon steel rivets, ... the weldability of different steels. (2) For early steels, reference can be made to the first edition of the monograph (Stout and Doty 1953) which includes suggested (as of 1953) welding

Ngày tải lên: 05/08/2014, 11:20

... tension flange (3) Repair alternatives. The following repair alternatives were developed for the miter gate. The types of cracks found on this structure are common to hydraulic structures that ... out -of- plane forces due to connection rigidity, and the crack driving force is apparently due to the floor beam flexure. The prior repair, which consisted of drilling a hole at the end of the ... minimal flexure is imposed at the end of the floor beam. This would eliminate the driving force that causes the out -of- plane distortion of the angle. Although many repair details could be designed

Ngày tải lên: 05/08/2014, 11:20

... Institute of Steel Construction 1989 American Institute of Steel Construction. 1989. “Allowable Stress Design Manual of Steel Construction,” 9 th ed., Chicago, IL. American Institute of Steel ... Metallizing: Hydraulic Structures CWGS 09940 Painting: Hydraulic Structures American Association of State Highway and Transportation Officials 1996 American Association of State Highway ... vibration problem (similar to the discussion of repair of the trashrack bars in paragraph 8-6e). Figure 8-18. Bolted tee connection retrofit of fractured hand rail 8-23 EM 1110-2-6054

Ngày tải lên: 05/08/2014, 11:20

... AND REPAIR OF HYDRAULIC STEEL STRUCTURES 1. Purpose. This manual describes the inspection, evaluation, and repair of hydraulic steel structures, including preinspection identification of critical ... environment of hydraulic steel structures but is not likely to cause significant structural degradation. (2) Localized corrosion is the type of corrosion most likely to affect hydraulic steel structures. ... stability, and serviceability of hydraulic steel structures must be evaluated. The major degrading effects of corrosion on structural members are a loss of cross section, buildup of corrosion products

Ngày tải lên: 11/08/2014, 09:20

... function of hydraulic steel structures is to dam and control the release of water. Sources of repeated loading include changes in load due to pool fluctuations, operation of the hydraulic steel ... given type of hydraulic steel structure For example, the following are typical locations of high-tension stress areas common to such hydraulic steel structures as... which areas of the ... the hydraulic steel structures. In addition, thick castings such as sector gears used for operating such structures as lock gates may be susceptible to brittle fracture. Hydraulic steel structures

Ngày tải lên: 11/08/2014, 09:20

... and location of inspected structures, date and time of inspection, type of inspection, inspection procedure, inspection equipment, inspector identity and qualifications, and a record of discontinuities ... ponding may occur and the location of web drain holes should be determined prior to inspection. (4) Seals on hydraulic steel structures are common locations of corrosion damage. Seals are subject ... discontinuity can be seen as a shadow of different photographic density from that of the image of the surrounding material. Evaluation of the radiograph is based on a comparison of these differences in photographic...

Ngày tải lên: 19/01/2014, 23:20

... AND REPAIR OF HYDRAULIC STEEL STRUCTURES 1. Purpose. This manual describes the inspection, evaluation, and repair of hydraulic steel structures, including preinspection identification of critical ... = number of cycles corresponding to S ri S ri = magnitude of a stress range block f. Repeated loading for hydraulic steel structures. The general function of hydraulic steel structures ... high-stress areas for a given type of hydraulic steel structure. For example, the following are typical locations of high-tension stress areas common to such hydraulic steel structures as roller, tainter,...

Ngày tải lên: 19/01/2014, 23:20