Tower Structural Design/ Analysis. Eric Heine, P.E.

Transcription

1 Tower Structural Design/ Analysis Eric Heine, P.E.

2 Eric Heine, P.E. has over 22 years of experience in structural design, analysis, reinforcement, and inspection of telecommunication structures and foundations. He has a degree in Civil Engineering with original P.E. Licensure in Structural 1. He is currently licensed as a Professional Engineer in 15 states and has designed new monopoles, self supporting, and guyed towers up to 750 in height and has completed structural analysis of existing towers up to 1,700 tall. He has also completed the design for and been involved with the modification/reinforcement of several hundred existing towers and foundations. Eric is personally involved with a tower order from the time he quotes the tower to the day it s shipped out and beyond by fielding any questions the installation crew may have during erection. He also has years of field experience performing tower mappings and inspections on structures ranging from poles and towers to water tanks and roof tops. Although he currently does not climb, Eric still serves as project manager on inspection projects with direct contact and guidance for inspection/mapping crews. Member of the TIA TR-14 committee.

3 New Changes for Rev H Requirements for Structural Analysis Requirements for Purchasing a New Tower

4 New Changes for Rev H Incorporates ACE 7-16 Standard revised Wind maps with Ultimate wind speed rather than nominal wind speeds. Wind speeds now dependent on Risk Category.

5 New Changes for Rev H Load factors had to be updated to account for ultimate wind speeds

6 New Changes for Rev H Structure Class is now referred to as Risk Category and has expanded from Classes I-II to Categories I-IV that are more defined. Default risk Category is II if not specified otherwise.

7 New Changes for Rev H Structure Class is now referred to as Risk Category and has expanded from Classes I-II to Categories I- IV that are more defined. Default risk Category is II if not specified otherwise

8 New Changes for Rev H Ground elevation factor added to account for air density. Wind speed-up factor added for rooftop installations. Seismic Section was updated to be in conformance with ASCE 7-16 and ACI Updated and Enhanced section on Foundations and Anchorages. Updated and Enhanced Protective Ground provisions.

9 New Changes for Rev H Updated Section on Existing Structures The loading, analysis, and design criteria related to installation, alteration, and maintenance of existing structures is NOT within the scope of the TIA-222-H Standard (Refer to the ANSI/TIA-322 standard). The criteria for safety practices within the construction, demolition, modification, and maintenance of existing structures is NOT within the scope of the TIA-222-H Standard (Refer to the ANSI/TIA A10.48 Standard).

10 Information Required for New Design Tower location (preferably coordinates) in order to determine wind and ice requirements, exposure categories and topographic effects. Risks Category Tower Height Tower Type (Guyed, Lattice Self Supporter, monopole, Concealment Structure). Design Loading(to include all initial and/or future equipment, antennas, mounts, feedlines etc that is to be considered on the structure for design purposes).

11 Information Required for New Design Height of roof top (if roof top installation). Any limitations on anchor radius for guyed towers. Any restrictions on type of members used (ie: solid round, tubular, angle, etc). Type of Climbing Facility to be considered (if specific preference). Any unique requirements or jurisdictional requirements(ie: higher wind or ice) that are different than the TIA standard must be included in the procurements specifications by the Purchaser.

12 Information Required for New Design Must specify if a specific or limited Fall Radius is required in the event of failure. Specify and provide details if the structure is to be extendable. Not if reserve capacity is required and/or maximum percent usage. Specify if MW twist/sway requirements are to be more stringent than standard. Additional requirements for concealment type structures. Case by Case.

13 Information Required for Analysis of Existing Structure Is analysis to be feasible or comprehensive as defined by TIA-222-H. Tower location (preferably coordinates) in order to determine wind and ice requirements, exposure categories and topographic effects. Risk categories. All existing tower data including: Face width(s) Section lengths Bracing details (type, panel heights, dimensions, etc..).

14 Information Required for Analysis of Existing Structure All member sizes (including all thickness for tubular members). Bolt and connection data (for Comprehensive Analysis). Material Grades (Refer to Annex R if not available). Guy size, elevations, type of guy pull-offs, anchor radius etc..(for guyed towers). Difference in ground elevation between tower base and anchors for (GT). Foundation and anchorage details (excluded from analysis if not availablerequired for Comprehensive Analysis).

15 Information Required for Analysis of Existing Structure All existing and proposed loading. Elevation and models/descriptions. To include all existing, proposed or future equipment, antennas, mounts, feedlines, conduits/power etc., that are to be included in analysis.

16 Information Required for Analysis of Existing Structure Sketch or description identifying where each feedline is installed on tower cross section

17 Information Required for Analysis of Existing Structure If tower mapping and loading information is not available Tower and/or foundation mapping can be completed to obtain necessary information. Height of rooftop (if rooftop installation). Type of climbing facility and specify whether safety climb cable or rail is in use. Any unique requirements or jurisdictional requirements(ie: higher wind or ice) that are different than the TIA standard, must be included in the procurements specifications by the customer. Specify if MW twist/sway requirements are to be more stringent than standard. Additional requirements for concealment type structures. Case by Case.

18 Questions??

19 Corporate Office: Ehresmann Engineering, Inc West 31 st Street Yankton, SD Ph Web: