repair of hydraulic steel structures

... 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

... 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 published for steel structural rivets, and superseded ASTM A141 and A195.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

... 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