Monopoles - Current Design Issues

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2010 ASCE / SEI Structures Congress | Orlando, FLNon-Building Structures | May 15, 2010 | D. HawkinsDiscussion of Current Issues Related to Steel Telecommunications Monopole StructuresBase Plate and Flange Plate Connections▪ Base Plates Without Stiffeners▪ Base Plates With Gusset Plate Stiffeners▪ Flange to Shaft Connection Types:(a) “Socket” Type with fillet welds(b) “Tee” Joint Type with CJP Welds© Copyright 2010 by Paul J. Ford and Company, all rights reserved.24 of 37
2010 ASCE / SEI Structures Congress | Orlando, FLNon-Building Structures | May 15, 2010 | D. HawkinsDiscussion of Current Issues Related to Steel Telecommunications Monopole StructuresBase Plates Without StiffenersCurrent design methodologies assume linear elastic bending of the baseplate. Typically used with AISC-ASD with TIA-222-F working loads.TIA TR-14.7 Subcommittee researching new base plate design criteria:• Plastic yield line methods at limit states. Analogous to yield lines inconcrete slabs, uses balanced energy approach.• Uses AISC-LRFD with TIA-222-G factored loads.• Base plate is proportioned for minimum thickness to eliminate pryingforces on the bolts.• Plate ultimate capacity determined by plastic bending limits (FyZ).• Results indicate plate thickness should be at least equal to anchor roddiameter.• Preliminary FEA studies of unstiffened base plates show yield linedistribution of stress.© Copyright 2010 by Paul J. Ford and Company, all rights reserved.25 of 37
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Monopoles - Current Design Issues

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