ANALYSIS OF EXISTING STRUCTURES

Self Supporting Tower 120 m Height

Prepared By;Jemi Dwi Astomo, ST

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

CRITERIA FOR THE ANALYSIS OF EXISTING STRUCTURES

According to TIA/EIA -222-FStructural Standards for Steel Antenna

Towers and Antenna Supporting Structures

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 ?

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 !

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 ;

TECHNICAL SPECIFICATION OF EXISTING STRUCTURES

According to construction records SST 120 m - Height

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

LOADING FOR THE ANALYSIS OF EXISTING STRUCTURES

According to TIA/EIA -222-FStructural Standards for Steel Antenna

Towers and Antenna Supporting Structures

LOADING OF TOWER STRUCTURELOADING OF TOWER STRUCTURELOADING OF TOWER STRUCTURE

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

LOADING OF TOWER STRUCTURELOADING OF TOWER STRUCTURELOADING OF TOWER STRUCTUREAntenna Load ( MW/Parabolic , GSM )

LOADING OF TOWER STRUCTURELOADING OF TOWER STRUCTURELOADING OF TOWER STRUCTUREAntenna Load ( MW/Parabolic , GSM )

REVIEW FOR THE ANALYSIS OF EXISTING STRUCTURES

According to TIA/EIA -222-FStructural Standards for Steel Antenna Towers and Antenna Supporting AISC-LRFD99

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

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

REVIEW FOR ANALYSIS TOWER STRUCTUREREVIEW FOR ANALYSIS TOWER STRUCTUREREVIEW FOR ANALYSIS TOWER STRUCTURESway & Twist

FIELD INVESTIGATION OF EXISTING STRUCTURES

According to TIA/EIA -222-FStructural Standards for Steel Antenna

Towers and Antenna Supporting Structures ( Annex E Fig.E6 )

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 .

FIELD INVESTIGATIONFIELD INVESTIGATIONFIELD INVESTIGATIONTwist and Plumb

FIELD INVESTIGATIONFIELD INVESTIGATIONFIELD INVESTIGATION

SOIL INVESTIGATION TEST SONDER TEST

BORING TEST

VERYFICATION LOADINGTIA/EIA -222-F

VsIndonesia Loading code PMI/PPI83

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

VERYFICATION LOADINGVERYFICATION LOADINGVERYFICATION LOADINGVELOCITY PRESSURE

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