ANSI TIA-222-G-1-2007 Structural Standards for Steel Antenna Towers and Antenna Supporting Structures - Addendum 1《钢天线塔和天线支持结构补充件1结构标准》.pdf

《ANSI TIA-222-G-1-2007 Structural Standards for Steel Antenna Towers and Antenna Supporting Structures - Addendum 1《钢天线塔和天线支持结构补充件1结构标准》.pdf》由会员分享，可在线阅读，更多相关《ANSI TIA-222-G-1-2007 Structural Standards for Steel Antenna Towers and Antenna Supporting Structures - Addendum 1《钢天线塔和天线支持结构补充件1结构标准》.pdf（58页珍藏版）》请在麦多课文档分享上搜索。

1、 TIA-222-G-1 (Addendum 1 to TIA-222-G) April 2007Structural Standard for Antenna Supporting Structures and Antennas- Addendum 1 ANSI/TIA-222-G-1-2007 APPROVED: APRIL 11, 2007 REAFFIRMED: JANUARY 8, 2013 REAFFIRMED: AUGUST 3, 2016 NOTICE TIA Engineering Standards and Publications are designed to serv

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29、REOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA-222-G ADDENDUM 11. Page 4 Table of Contents Page numbering 2. Page 5 Table of Contents Page number, Normative to Informative, Explanation of Normative/Informative 3. Page 7 Normative/Informative Annex definitions mo

30、ved to Table of Contents 4. Page 12 2.6.5.1 Definition of Exposure B 2600 ft 5. Page 12 2.6.5.1 Definition of Exposure D 20 times the height of the structure 6. Page 15 2.6.7.1 Added bracketed latticed structures 7. Page 15 2.6.7.4 The application to structures supported on other structures 8. Page

31、15 2.6.7.4 Modified gust effect factors Izm= displacement amplitude at level z when vibrating in the mthmode; a, b Agi= area of an individual guy at elevation; As= earthquake amplification factor; Cg= natural frequency conversion factor for guyed masts; Czm= seismic force distribution factor for the

32、 mthmode; E = modulus of elasticity of structure material; Fa= acceleration-based site coefficient at short periods; FSZ= Lateral seismic force at level z; Fv= velocity-based site coefficient at 1 second; Fzm= seismic forces at level z for the mthmode; f1= fundamental frequency of structure; fm= fre

33、quency of structure for the mode under consideration; Gri= average guy radius for guys at elevation; g = acceleration due to gravity; Hgi= height above base to guy elevation; h = height of structure; hi= height from the base of structure to level; hz= height from the base of structure to level z; I

34、= importance factor; ANSI/TIA-222-G Addendum 1 33Tm= 1/fmfm= frequency of structure for the mode under consideration, Hertz For Tm64 8.7 (Supercritical)0.60 0.65 0.75 1.0 1.2 C = (I KztKz)0.5 (V)(D) for D in ft m, V in mph m/s V is the basic wind speed for the loading condition under investigation.

35、D is the pole outside diameter for rounds or the outside point-to-point diameter for polygons. Notes: 1. When linear appurtenances such as ladders, waveguides, coax, brackets, or other similar projections are attached on the outside of the pole shaft, effective projected areas shall be calculated as

36、 follows: a. When Rad 0.1, the projected areas of the attachments may be ignored. b. When 0.1 0.2, or alternatively for any value of Ra, the value of CFfor subcritical flow shall be used. The projected areas of the attachments shall be considered separately in addition to the structure using appropr

37、iate force coefficients for appurtenances. Where Rais the ratio of the projected area of the attachments (perpendicular to the wind direction) to the projected area of the structure without the attachments for the portion being considered. For iced conditions, the ice thickness need not be included

38、in the determination of Ra.2. For iced conditions, CFshall be based on subcritical flow for all values of C. 3. Linear interpolation, based on the inscribed angle of each side, between the values shown, may be used for other cross-sections. The inscribed angle for a round cross-section is 0 degrees.

39、 ANSI/TIA-222-G Addendum 1 42Table 2-8 Force Coefficients (Ca) For Appurtenances Aspect Ratio d 2.5 Aspect Ratio = 7 Aspect Ratio t 25 Member Type CaCaCaFlat 1.2 1.4 2.0 C 64 8.7 (Supercritical)0.50 0.60 0.60 Where:C = (I KztKz)0.5(V)(D) for D in ft m, V in mph m/s V is the basic wind speed for the

40、loading condition under investigation. D is the outside diameter of the appurtenance. Aspect ratio is the overall length/width ratio in the plane normal to the wind direction. (Aspect ratio is independent of the spacing between support points of a linear appurtenance, and the section length consider

41、ed to have uniform wind load). Notes:1. For cylindrical appurtenances, when irregularities such as flanges, hangers, etc., are present, effective projected areas shall be calculated as follows: a. When Rad 0.1, the projected areas of the irregularities may be ignored. b. When 0.1 0.2, or alternative

42、ly for any value of Ra, the value of Cafor subcritical flow shall be used. The projected areas of irregularities shall be considered separately in addition to the appurtenance using the appropriate force coefficients. Where Rais the ratio of the projected area of the irregularities (perpendicular to

43、 the wind direction) to the projected area of the appurtenance without the irregularities for the portion being considered. For iced conditions, the ice thickness need not be considered in the determination of Ra.2. For flat appurtenances, when irregularities such as flanges, hangers, etc., are pres

44、ent, the projected areas of the irregularities shall be considered separately in addition to the appurtenance using appropriate force coefficients except when Ra is less than or equal to 0.1, the projected areas of the irregularities may be ignored. 3. For iced conditions, Cashall be based on subcri

45、tical flow for all values of C. 4. Linear interpolation may be used for aspect ratios other than those shown. 5. Subcritical force coefficients may conservatively be used for any value of C. ANSI/TIA-222-G Addendum 1 510.80 SHIELDING FACTOR Ka, APPLIES (MINIMUM OF 3 MOUNTING FRAMES REQUIRED) 0.75 SH

46、IELDING FACTOR Ka, APPLIES (MINIMUM OF 3 MOUNTING FRAMES REQUIRED) Figure 2-6: Multiple Mounting Frames ANSI/TIA-222-G Addendum 1 664.0 DESIGN STRENGTH OF STRUCTURAL STEEL 4.1 Scope This section relates to the strength design of structural steel angles, solid rounds and tubular members used in latti

47、ced towers, poles and guyed masts. The following clauses are based on the AISC-LRFD-99. When the requirements in AISC-LRFD-99 differ from this Standard, this Standard shall govern. If other shapes or types of structures are utilized, the requirements of AISC-LRFD-99 shall be used. Cold formed light

48、gauge steel structural members not covered by this Standard shall conform to the requirements of AISI-2001 “North American Specification for the Design of Cold-formed Steel Structural Members”, hereafter referred to as the AISI Specification. 4.2 Definitions Effective length factor: a factor, K, to

49、modify the unbraced length, L, to take into account the structural configuration and end conditions. Effective slenderness ratio: the slenderness ratio modified to take into account the structural configuration and end conditions for the purpose of calculating the design compression strength. Line of action: a line that is parallel to the longitudinal axis of a member that passes through the centroid of the bolt group connecting the member to another member. In-plane buckling: direction of buckling considered in plane defined by the face of a lat