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Update061305

'Update061305'
AmericanLifelinesAlliance A public-private partnership to reduce risk to utility and transportation systems from natural hazards Guidelines for the Design of Buried Steel Pipe July 2001 (with addenda through February 2005) ?????????????????????????? A public-private partnership to reduce risk to utility and transportation systems from natural hazards ? ? ? ? ?????????????????????????? ????????????????????? ? ?????????? ? ? ????????????????????????????????? This report was written under contract to the American Lifelines Alliance, a public-private partnership between the Federal Emergency Management Agency (FEMA) and the American Society of Civil Engineers (ASCE). This report was reviewed by a team representing practicing engineers and academics. Guidelines for the Design of Buried Steel Pipe July 2001 i Acknowledgments The following people (with their affiliations) contributed to this report. G. A. Antaki, Co-chairman WSRC, Aiken, SC J. D. Hart, Co-chairman SSD, Inc., Reno, NV T. M. Adams Stevenson and Associates, Cleveland, OH C. Chern Bechtel, San Francisco, CA C. C. Costantino City College of New York, New York, NY R. W. Gailing Southern California Gas Co., Los Angeles, CA E. C. Goodling Parsons Energy however, because of the buoyancy of the soil in water, the actual total pressure load is: psfft ft lb ft ft lb Pv1294)10()100()33 . 0 1 ()10)( 4 . 62( 33 ?????? 3.5 Example 3 A 30-inch diameter pipe is jacked 10 feet underground into undisturbed medium clay with a total unit weight of 120 pounds per cubic foot. The cohesion coefficient c is estimated to be 500 psf. Check the vertical earth load pressure using Equations 3-1 and 3.3: 3 lb 120(10ft)1,200psf ft v P ?? ?? ?? ?? Guidelines for the Design of Buried Steel Pipe July 2001 Page 12 222 lblb10 ft12 inlb 12002(500)28000 30 in1 ftftftft vu P ???? ??? ?? ???? ???? Since the vertical earth load pressure must be greater than or equal to zero, there is no vertical earth load on the pipe. 3.6 Figure Figure 3.1-1 Soil Prism Above Pipe Guidelines for the Design of Buried Steel Pipe July 2001 Page 13 4.0 Surface Live Loads 4.1 Applied Loads In addition to supporting dead loads imposed by earth cover, buried pipes can also be exposed to superimposed concentrated or distributed live loads. Large concentrated loads, such as those caused by truck-wheel loads, railway car, locomotive loads, and aircraft loads at airports are of most practical interest. Depending on the requirements of the design specification, the live-load effect may be based on AASHTO HS-20 truck loads, Cooper E-80 railroad loads or a 180 kip airplane gear assembly load, as indicated in Table 4.1-1. The values of the live load pressure PP are given in psi and include an impact factor F’ = 1.5 to account for bumps and irregularities in the travel surface. Other impact factors are listed in Table 4.1-2. Note: Live-load depends on the depth of cover over the pipe and becomes negligible for HS-20 loads when the earth cover excee
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Update061305
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