ASTM B790-16(R2021) pdf free download

ASTM B790-16(R2021) pdf free download.Standard Practice for Structural Design of Corrugated Aluminum Pipe, Pipe- Arches, and Arches for Culverts, Storm Sewers, and Other Buried Conduits
1. Scope
1.1 This practice is intended for the structural design of corrugated aluminum pipe and pipe-arches, and aluminum structural plate pipe, pipe-arches, and arches for use as culverts and storm sewers and other buried conduits. This practice is for pipe installed in a trench or embankment and subjected to highway, railroad, and aircraft loadings. It must be recognized that a buried corrugated aluminum pipe is a composite struc- ture made up of the aluminum ring and the soil envelope, and both elements play a vital part in the structural design of this type of structure. 1.2 Corrugated aluminum pipe and pipe-arches shall be of annular fabrication using riveted seams, or of helical fabrica- tion having a continuous lockseam. 1.3 Structural plate pipe, pipe-arches, and arches are fabri- cated in separate plates that when assembled at the job site by bolting form the required shape. 1.4 This practice is applicable to design in inch-pound units as Specification B790 or in SI units as Specification B790M. Inch-pound units and SI units are not necessarily equivalent. SI units are shown in brackets in the text for clarity, but they are the applicable values when the design is done in accordance with Specification B790M. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.6 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions ofTerms Specific to This Standard: 3.1.1 arch, n—a pipe shape that is supported on footings and does not have a full metal invert. 3.1.2 bedding, n—the earth or other material on which the pipe is laid consist of a thin layer of important material on top of the in-situ foundation. 3.1.3 haunch, n—the portion of the pipe cross section between the maximum horizontal dimension and the top of the bedding. 3.1.4 invert, n—the lowest portion of the pipe cross section; also, the bottom portion of the pipe. 3.1.5 pipe, n—a conduit having a full circular shape or, in a general contex, all structure shapes covered by this practice. 3.1.6 pipe-arch, n—a pipe shape consisting of an approxi- mate semicircular top portion, small radius corners, and large radius invert. 3.1.7 long span structures, n—special shapes of any size having a crown or side radius greater than 13.0 ft [4000 mm]. Metal box culverts (rise/span ≤ 0.3) are not considered long- span structures and are discussed in Specification B864/ B864M.
5. Basis of Design
5.1 The recommendations presented herein, represent gen- erally accepted design practice. The design engineer shall, however, determine that these recommendations meet particu- lar project needs. 5.2 This practice is not applicable for long-span structures. Such structures require additional design considerations for both the pipe and the soil envelope. The design of long-span structures is described in the AASHTO LRFD Bridge Design Specification. 5.3 Structures designed to this standard shall meet the requirements of this standard.
6.2.2.3 Live Loads Under Aircraft Runways—Because of the many different wheel configurations and weights, live load pressures for aircraft vary. Such pressures must be determined for the specific aircraft for which the installation is designed; see the FAA publication “Airport Drainage.” 6.2.3 Impact Loads—Loads caused by the impact ofmoving traffic are important only at low heights of cover. Their effects have been included in live load pressures in 6.2.2.