Design Note Tower 30m

TOWER

DESIGN REPORT EC1 / EC3

Project N PR160085 Edition: 01 Date: 19/02/2016 Sheets: 1/5

Object: Design Report of Telecommunication Towers 30m Client: Technical, Helder Costa

This document is property of Irmos Silvas, SA - any reproduction and/or transmission to third parties is prohibited without written permission.

MAGANHA S.TIAGO DE BOUGADO 4785 TROFA PORTUGAL TLF.00351-252400520 FAX. 00351-252400521 www.metalogalva.pt | [email protected]

P:\1_ESTUDO_SIMPLES\6.0_TORRES_TELEC\6.0.2_RETICULADAS\2016\PR160085_CALZAVARRA_50M_40M_30M_150KMH\3_ESTUDO_SIMPLES\30M\DESIGN_NOTE_TOWER_30M.doc]

IRMOS SILVAS, S.A.| Mod. IS006A // DocSGQ | MemriaClculo-02 [DESIGN_NOTE_TOWER_30M.doc]

NDICE

Page

1. INTRODUCTION ...................................................................................................................................................2

2. DATE ....................................................................................................................................................................2

2.1. GEOMETRY ................................................................................................................................................................................... 2 2.2. DESCRIPTION ................................................................................................................................................................................ 2 2.3. EQUIPMENT ................................................................................................................................................................................... 2

2.3.1. Antennas................................................................................................................................................................................ 2 2.3.2. Other equipment .................................................................................................................................................................. 2

3. CALCULATION RESOURCES .................................................................................................................................2

3.1. ACTIONS ....................................................................................................................................................................................... 2 3.1.1. Wind Action ......................................................................................................................................................................... 3

3.2. CRITERIA AND RESOURCES............................................................................................................................................................. 3 3.2.1. Ultimate Limit State (U.L.S.) ............................................................................................................................................... 3 3.2.2. Service Limite State (S.L.S.) ............................................................................................................................................... 3 3.2.3. Calculation resources .......................................................................................................................................................... 3 3.2.4. Basal efforts ......................................................................................................................................................................... 4

3.3. MATERIALS ................................................................................................................................................................................ 4 3.3.1. Material properties ............................................................................................................................................................. 4 3.3.2. Fabrication Methods ........................................................................................................................................................... 4

TOWER








1. INTRODUCTION The design report pretends to explain the calculation of towers for support of telecommunication antennas with 30m height.

2. DATE

2.1. GEOMETRY Will be formed by a mast made with a prismatic form and three legged base. Executed with tubular sections for legs and bracing members connected by welding and bolted plates. The mast will be embedded in the soil by a foundation block.

2.2. DESCRIPTION The shaft will be executed with tubular sections of steel S355. Will be formed with legs and bracing connected with bolts, plates and weld. The shaft is assembled in maximum segments of 5.86m, connected with joints.

The cable management system will be located adjacent to the ladder of the tower.

2.3. EQUIPMENT

2.3.1. Antennas

The tower is able to support multiple antennas in a total of 6 m wind surface area.

2.3.2. Other equipment

Platform, Ladder and Cables guides

3. CALCULATION RESOURCES

3.1. ACTIONS The actions are defined by the EUROCODE 1 (EN 1991-1-1) and by the customer:

* Permanent Actions: self weight. * Variable loads: wind action.

TOWER








3.1.1. Wind Action

The wind action on the tower and equipment was defined by the customer and is represented by a wind profile with 150km/h of gust wind speed at the top of the tower corresponding to a reference wind speed of 23.7 m/s and a terrain category of 2.

3.2. CRITERIA AND RESOURCES

3.2.1. Ultimate Limit State (U.L.S.)

It was considered the wind loads on structure and equipment. All the actions were assumed simultaneously and acting in the most unfavorable direction. The combination of actions for ULS is:

( ) ( )( )

( )6.1 actions for windfactor Partial 2.1 jaction permanent for factor Partial

11

=

=

+ ==

WW

GG

k

n

Wk

i

n

Gi WG

The design verification consists in comparing the stress due to the forces combined with the proper partial factors with the design resistant stress of the materials:

( )0.1 properties material for thefactor partial

11

1

=

+

MM

M

y

x

sdsd fWM

AN

3.2.2. Service Limite State (S.L.S.)

We consider a Serviceability Limit State corresponding at a wind speed of 120km/h, without safety coefficients. The rotation at the top is lower than 0.4.

3.2.3. Calculation resources

Stability verification, forces and displacements determination were calculated with an integrated graphic program for modelling the Ultimate Limit State and Serviceability Limit State.

TOWER








3.2.4. Basal efforts

The basal efforts are the following:

Perpendicular Wind /Vent Perpendiculaire

Operating Wind (SLS) / Vent Oprationnel (ELS) -27.9 28.8 616.1Operating Wind (ULS) /Vent Oprationnel (ELU) -27.9 43.2 924.1

Diagonal Wind /Vent Diagonal

Operating Wind (SLS) / Vent Oprationnel (ELS) -27.9 29.1 -620.3Operating Wind (ULS) /Vent Oprationnel (ELU) -27.9 46.5 -992.4

TYPE OF ACTIONS / TYPE D'ACTIONS Vertical / Verticale (kN) Horizontal / Horizontale (kN) Moment / Moment (kN.m)

3.3. MATERIALS The materials used for fabrication of the tower are:

ELEMENT MATERIAL STANDARD Tower S355 and S275 EN NP 10 025 Accessories S275 EN NP 10 025 Bolts 8.8 ISO 4014 ou ISO 4017 Nuts 8.8 ISO 4014 ou ISO 4017

All these materials will be hot dip galvanizes. The mast can also be painted after the galvanizing process for daylight flight sign or additional corrosion protection.

3.3.1. Material properties

The characteristic values of the Yield strength, failure strength are:

3.3.2. Fabrication Methods

The mast will be made in maximum lengths of 5.86m, and assembled on site fitting the parts of the mast together.

The steel profiles and plates will be cut by mechanical and/or heat process. The holes will be drilled or punched. Bending or rolling will forms parts, joined by welding or bolts.

MATERIAL F YK F UK S235 235 MPa 360 MPa S275 275 MPa 430 MPa S355 355 MPa 510 MPa 5.6 355 MPa 500 MPa 8.8 640 MPa 800 MPa

TOWER








The bolts to be used in the principal connections will be class 8.8 (hot dip galvanized).

Design Note Tower 30m

Documents

Transcript of Design Note Tower 30m