ANSI TIA-222-G-3-2014 Structural Standards for Steel Antenna Towers and Antenna Supporting Structures- Addendum 3 (Addendum to TIA-222-G).pdf

1、 TIA-222-G-3 (Addendum to TIA-222-G) December 2014Structural Standards for Steel Antenna Towers and Antenna Supporting Structures- Addendum 3 ANSI/TIA-222-G-3-2014 APPROVED: DECEMBER 15, 2014 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminat

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23、TIA WITHOUT SUCH LIMITATIONS. ANSI/TIA-222-G Addendum 3 1 Tubular Pole Base Plates TABLE OF CONTENTS OBJECTIVE 3 SCOPE 3 1.0 GENERAL 3 1.1 Design Criteria 3 1.2 Definitions 4 1.3 Abbreviations 4 1.4 Symbols and Notations 4 1.5 Anchor Rods 5 1.6 Base Plate Thickness 5 1.7 Yield Strength 5 1.8 Center

24、Opening for Butt Welded Base Plates 5 1.9 Strength Resistance Factors 6 2.0 ANCHOR ROD FORCE 6 3.0 BASE PLATE BENDING 6 3.1 External Base Plates 7 3.2 Internal Base Plates 7 4.0 BASE PLATE SHEAR 8 4.1 External Base Plates 8 4.2 Internal Base Plates 8 5.0 SOCKETED CONNECTIONS 8 6.0 BUTT WELDED CONNEC

25、TIONS 9 7.0 BASE PLATE ANCHOR ROD HOLES 9 8.0 GROUTED BASE PLATES 9 REFERENCE TABLES AND FIGURES 10 ANSI/TIA-222-G Addendum 3 ANNEX A: REFERENCES (INFORMATIVE) 13 Note: Informative annexes contain additional information that are not considered part of the standard. ANSI/TIA-222-G Addendum 3 3Tubular

26、 Pole Base Plates OBJECTIVE The objective of this Addendum is to provide recognized literature intended to be used in conjunction with the ANSI/TIA-222-G Standard, “Structural Standard for Antenna Supporting Structures and Antennas” (TIA) for the design and analysis of tubular pole base plates. This

27、 Addendum provides supplementary requirements that pertain specifically to the unique characteristics of tubular pole base plates. The intent of this Addendum is to provide a method of design and analysis for rigid base plate behavior without the use of stiffeners resulting in insignificant anchor r

28、od bending and insignificant secondary pole wall bending stresses under factored reactions from limit state strength loading conditions. It is not the intent of this Addendum to prevent the use of other methods developed in accordance with TIA load and resistance factors. Although this Addendum is i

29、ntended for tubular pole base plates, the provisions for determining plate thickness requirements for bending and shear may be extended to flange plates used for flanged tubular and solid round leg splices for latticed structures. Other provisions in this Addendum are specifically intended to only a

30、pply to tubular pole base plates. SCOPE This Addendum is intended to apply to base plates conforming to all of the following: 1. Tubular steel poles with round cross sections or polygonal cross sections with 6 or more sides. 2. Socketed and butt welded base plate connections. 3. Round uniform thickn

31、ess base plates. 4. Base plates without stiffeners. 5. Base plates with round center openings with galvanizing drainage or vent holes or slots. 6. Base plates supported on leveling nuts. 7. Base plates with or without the use of grout. 8. Anchor rods equally spaced about an external or internal bolt

32、 circle. 9. A minimum of 8 anchor rods. 10. Holes for anchor rods fabricated without slots to a free edge. 1.0 GENERAL 1.1 Design Criteria Tubular pole base plates shall be in conformance with the requirements of TIA and the additional supplementary requirements of this Addendum. Base plates conform

33、ing to the requirements of this Addendum shall be considered rigid. The design and analysis criteria for non-rigid base plates shall be based on rational design methods that account for the use of stiffeners or for the additional anchor rod stresses and secondary pole wall stresses resulting from ba

34、se plate bending. ANSI/TIA-222-G Addendum 3 4Notes: 1) The method for determining base plate bending strength is based on yield line theory assuming both transverse and radial yield lines and assumes the use of ductile steel capable of yielding and redistributing stress to form yield lines under a l

35、imit state strength loading condition. Rigidity is addressed by restricting the geometry of the base plate and anchor rods, by limiting the effective widths of the transverse and radial yield lines and by limiting the design yield strength of the base plate. Base plate shear strength is required to

36、match the design tensile bending strength of the pole wall. 2) The required base plate bending strength is based on the required anchor rod forces to resist the applied reactions from the pole. Anchor rod forces are determined by assuming an equivalent steel ring with a diameter equal to the anchor

37、rod bolt circle in conjunction with a correction factor based on the number of anchor rods. Anchor rod forces may be determined based on a plastic distribution of forces when the anchor rods are fully developed into the foundation. 1.2 Definitions External base plate: a base plate with a bolt circle

38、 external to the pole cross section. Internal base plate: a base plate with a bolt circle internal to the pole cross section. Pole diameter: outside diameter of a round cross section pole or the outside flat-to-flat dimension of a polygonal cross section pole. 1.3 Abbreviations TIA Telecommunication

39、s Industry Association Standard ANSI/TIA-222-G 1.4 Symbols and Notations Beff= total effective base plate width resisting bending; Ber= effective base plate width resisting bending from radial bend lines; Bet= effective base plate width resisting bending from transverse bend line; DBC= anchor rod bo

40、lt circle diameter; Dce= effective base plate center opening diameter; De= effective pole outside diameter; Di= effective pole inside diameter; DOD = base plate outside diameter; Doe= effective base plate outside diameter; DOP= base plate center opening diameter; DT= outside diameter of a round cros

41、s section pole, outside flat-to-flat dimension of a polygonal cross section pole; Fyf= base plate design yield strength; Fyp= pole design yield strength; Mu= pole resultant overturning moment reaction due to factored loads on anchor rod group; Pu= maximum anchor rod axial force due to factored pole

42、reactions on anchor rod group; Ru= pole vertical reaction due to factored loads on anchor rod group; ANSI/TIA-222-G Addendum 3 5ds= the diameter of a hole or the length of a slot used for galvanizing drainage or venting; n = number of anchor rods; nc= anchor rod force correction factor; tTP= base pl

43、ate thickness; tT= pole wall thickness; w1= outside fillet weld horizontal leg dimension; w2= inside fillet weld horizontal leg dimension; x = effective moment arm of anchor rod force; = governing angle defining effective base plate width resisting bending; 1= half-angle between radial lines extendi

44、ng from pole centerline through midpoints between adjacent anchor rods; 2= angle defining limiting effective base plate width based on plate thickness; 3= angle defining limiting effective base plate width based on distance between anchor rod bolt circle and effective pole outside diameter; b= stren

45、gth resistance factor for base plate yielding due to bending; v= strength resistance factor for base plate yielding due to shear. 1.5 Anchor Rods The distance between the anchor rod bolt circle and the effective pole diameter shall not exceed three times the base plate thickness for rigid base plate

46、 behavior. The limitation on anchor rod bolt circle diameter may be expressed by the following equations: For external base plates: DBC DT+ w1+ 6(tTP) For internal base plates: DBC DT- 2(tT) - w2- 6(tTP) Anchor rods shall be on a symmetrical circular pattern. A minimum of 8 anchor rods shall be util

47、ized. The minimum anchor rod nominal diameter shall be 0.75 inches 19 mm. The spacing between anchor rods measured circumferentially along the bolt circle shall not exceed 6 times the base plate thickness but in no case shall the spacing exceed 15 inches 381 mm. 1.6 Base Plate Thickness Base plates

48、shall satisfy the thickness requirements for plate bending and shear outlined in Sections 3.0 and 4.0. Base plate thickness shall not be less than the anchor rod diameter for anchor rods with required minimum guaranteed yield strengths exceeding 75 ksi 520 MPa and for lower strength anchor rods, not

49、 less than the anchor rod diameter minus 0.25 inches 6 mm. 1.7 Yield Strength The design yield strength of the base plate, Fyf, shall equal the published guaranteed minimum yield strength of the base plate material but shall not exceed 60 ksi 415 MPa. 1.8 Center Opening for Butt Welded Base Plates ANSI/TIA-222-G Addendum 3 6The minimum center opening diameter shall be equal to 50% of the pole diameter for proper galvanizin