Download - Analysis of Existing Structures
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ANALYSIS OF EXISTING STRUCTURES
Self Supporting Tower 120 m Height
Prepared By;Jemi Dwi Astomo, ST
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STANDARD/REFERENCE TIA/EIA -222-F 1996 STANDARD
Structural Standards for Steel Antenna Towers and Antenna Supporting Structures
AISC-LRFD99 Manual of Steel Construction
ACI-318 -99 Building Code Requirement For Structural Concrete
ASCE 7-98 Minimum Design Load For Building and Other Structures
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CRITERIA FOR THE ANALYSIS OF EXISTING STRUCTURES
According to TIA/EIA -222-FStructural Standards for Steel Antenna
Towers and Antenna Supporting Structures
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CRITERIA FOR THE ANALYSIS OF EXISTING CRITERIA FOR THE ANALYSIS OF EXISTING CRITERIA FOR THE ANALYSIS OF EXISTING STRUCTURESSTRUCTURESSTRUCTURES
9 There is change in antennas, transmission
lines, and /or appurtenances ( quantity, size,
location or type )
9There is a change in Operational Requirements
( Twist and Sway )
9There is need to increase wind speed to load
scale for safety ratio
When Structural Tower Structures Should be Reanalysis ?
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CRITERIA FOR THE ANALYSIS OF EXISTING CRITERIA FOR THE ANALYSIS OF EXISTING CRITERIA FOR THE ANALYSIS OF EXISTING STRUCTURESSTRUCTURESSTRUCTURES
9Member Size, Dimension, and Connection
9Material Properties
9Existing and Proposed loading ; antennas (size,
elevation, and azimuth), and Appurtenances.
To Perform the Analysis, The Following data is Required !
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CRITERIA FOR THE ANALYSIS OF EXISTING CRITERIA FOR THE ANALYSIS OF EXISTING CRITERIA FOR THE ANALYSIS OF EXISTING STRUCTURESSTRUCTURESSTRUCTURES
9Previous Stress and Rigidity analysis ( Structure and
Foundation )
9Structural and detail drawing ( design and as-built )
9Specifications
9Construction Records
9Field Investigation
Data may be obtained from the following sources ;
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TECHNICAL SPECIFICATION OF EXISTING STRUCTURES
According to construction records SST 120 m - Height
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TECHNICAL SPECIFICATION OF TOWERTECHNICAL SPECIFICATION OF TOWERTECHNICAL SPECIFICATION OF TOWER
9 Steel Structures SS-400 ( Fy = 2400 kg/cm2 )
9 Bolt & Nut JIS grade 8.8 (Fy= 5500 kg/cm2 )
9 Anchor Bolt ASTM A-307 ( Fy= 2400 kg/cm2 )
9 First Coating Hot Dip Galvanizing ASTM A-123
9 Welding Electrodes AWS D1.1 E60XX
9 Concrete K-225 ( Fc=19 Mpa ) 28 days
9 Rebar Grade Fy= 240 < 12 mm ( BJTP )
Fy= 320 > 13 mm ( BJTD )
Materials
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LOADING FOR THE ANALYSIS OF EXISTING STRUCTURES
According to TIA/EIA -222-FStructural Standards for Steel Antenna
Towers and Antenna Supporting Structures
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LOADING OF TOWER STRUCTURELOADING OF TOWER STRUCTURELOADING OF TOWER STRUCTURE
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LOADING OF TOWER STRUCTURELOADING OF TOWER STRUCTURELOADING OF TOWER STRUCTURE
9 Dead Load The weight of the Structure and Appurtenance
9 Wind Load The Horizontal force applied to the structures in
the direction of wind .
F= qz . GH [CF . AE+(CA . AA)]9 Antenna Load
Fa= CA . Kz.GH.V2
Fs= Cs . Kz.GH.V2
M= Cm . Kz.D.GH.V2
9 Seismic Load
Vertical and Horisontal Loading
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LOADING OF TOWER STRUCTURELOADING OF TOWER STRUCTURELOADING OF TOWER STRUCTUREAntenna Load ( MW/Parabolic , GSM )
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LOADING OF TOWER STRUCTURELOADING OF TOWER STRUCTURELOADING OF TOWER STRUCTUREAntenna Load ( MW/Parabolic , GSM )
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REVIEW FOR THE ANALYSIS OF EXISTING STRUCTURES
According to TIA/EIA -222-FStructural Standards for Steel Antenna Towers and Antenna Supporting AISC-LRFD99
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REVIEW FOR ANALYSIS TOWER STRUCTUREREVIEW FOR ANALYSIS TOWER STRUCTUREREVIEW FOR ANALYSIS TOWER STRUCTURE
9 i.Qi < Rn ( Member Checking By SAP 2000)
Stress
Slenderness Ratio
9 L/r < 150 For Legs member
9 L/r < 200 For Bracing member
9 L/r < 250 For Redundants member
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REVIEW FOR ANALYSIS TOWER STRUCTUREREVIEW FOR ANALYSIS TOWER STRUCTUREREVIEW FOR ANALYSIS TOWER STRUCTURE
9The angular rotation of the antenna beam path in a
Vertical plane
Sway
Twist
9The angular rotation of the antenna beam path in a
Horizontal plane
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REVIEW FOR ANALYSIS TOWER STRUCTUREREVIEW FOR ANALYSIS TOWER STRUCTUREREVIEW FOR ANALYSIS TOWER STRUCTURESway & Twist
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FIELD INVESTIGATION OF EXISTING STRUCTURES
According to TIA/EIA -222-FStructural Standards for Steel Antenna
Towers and Antenna Supporting Structures ( Annex E Fig.E6 )
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FIELD INVESTIGATIONFIELD INVESTIGATIONFIELD INVESTIGATIONTwist and Plumb Field Investigation
Twist Angular rotation in horizontal Plane between any two
elevation shall not exceed 0.5 degree in 3 meter and total twist in the
structure shall not exceed 5 degree.
Plumb- The Horizontal distance between the vertical centerlines at
any two elevation shall not exceed 0.25 percent of the vertical distance
between the two elevation .
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FIELD INVESTIGATIONFIELD INVESTIGATIONFIELD INVESTIGATIONTwist and Plumb
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FIELD INVESTIGATIONFIELD INVESTIGATIONFIELD INVESTIGATION
SOIL INVESTIGATION TEST SONDER TEST
BORING TEST
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VERYFICATION LOADINGTIA/EIA -222-F
VsIndonesia Loading code PMI/PPI83
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VERYFICATION LOADINGVERYFICATION LOADINGVERYFICATION LOADING
* see Grafik verify PMI & TIA/EIA-22-F
Discrete Apportunance
(CA.AA)] =F=P.C.AF=qz.GH[CF.AE+(CA.A
A)]DESIGN WIND LOAD6
1.0
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VERYFICATION LOADINGVERYFICATION LOADINGVERYFICATION LOADINGVELOCITY PRESSURE
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