Guyed Mast for Wind Performance Measurements in Andalusia, Spain
Customer Project
Removable guyed masts are used not only for telecommunications purposes, but also for collecting wind data in order to evaluate the profitability of a planned wind farm. Such removable and permanent towers can reach heights of up to 492 ft and are mounted at the planned windmill height in uninhabited areas.
| Structural Analysis and Design |
Lasser Eolica S.L., Madrid, Spain lassereolica.com |
Model
The Spanish company Lasser Eólica specializes in evaluating wind data. Their services also include the design, documentation and construction of guyed masts worldwide. The main goal of the tower structure is to achieve as maximum wind permeability. Therefore, the towers consist of tubular steel trusses with a triangular ground plan. For each plane, three sets of prestressed cables are used to stabilize the tower at different heights.
To avoid measurement errors during data collection, the measuring devices such as anemometer and weather vane must be positioned by level arms at a certain distance and at a certain height from the tower surface according to ISO 61400-12-1.
Design in RSTAB
The Lasser Eólica technical team designs the relevant load cases such as ice and wind loading depending on each individual project’s location. Afterwards, the data is entered in RSTAB using customized data sheets. The load is entered with the TOWER Loading add-on module. For the standard design together with the global stability behavior, the team additionally utilizes the add-on modules STEEL EC3 and RSBUCK.
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Display Options for Result Values on Surfaces
You can make various settings in order to achieve a clearly‑arranged display of the result values. For example, some users may not want the white background in text bubbles. You can adjust the background in ‘Display Properties’ using the option Transparent and Background color.
SHAPE-THIN determines the effective cross-sections according to EN 1993-1-3 and EN 1993-1-5 for cold-formed sections. You can optionally check the geometric conditions for the applicability of the standard specified in EN 1993‑1‑3, Section 5.2.
The effects of local plate buckling are considered according to the method of reduced widths and the possible buckling of stiffeners (instability) is considered for stiffened sections according to EN 1993-1-3, Section 5.5.
As an option, you can perform an iterative calculation to optimize the effective cross-section.
You can display the effective cross-sections graphically.
Read more about designing cold-formed sections with SHAPE-THIN and RF-/STEEL Cold-Formed Sections in this technical article: Design of a Thin-Walled, Cold-Formed C-Section According to EN 1993-1-3.
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Programs Used for Structural Analysis
Main Program
The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions
2,550.00 USD
Add-on Module
Design of steel members according to Eurocode 3
1,480.00 USD
Add-on Module
Stability analysis according to the eigenvalue method
670.00 USD
Add-on Module
Generation of wind, ice and variable loads for lattice towers
1,750.00 USD
