Guyed Mast for Wind Performance Measurements in Andalusia, Spain
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
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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RF-/PLATE-BUCKLING Add-on Module for RFEM/RSTAB | Plate Buckling Analysis for Plates with or Without Stiffeners According to 1993-1-5
RFEM/RSTAB Add-on Module RF-IMP/RSIMP | Generation of Geometric Replacement Imperfections and Pre-deformed Replacement Structures
Extension of the RF-/STEEL Warping Erosion module | Lateral -torsional buckling analyzes of members according to the second -order theory with 7 degrees of freedom
RFEM/RSTAB add-on module RF-/TOWER effective lengths | Determination of effective lengths of lattice towers
RFEM/RSTAB add-on module RF-/JOINTS Steel-Column Base | Hinged and restrained column bases according to EC 3
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
The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions
Design of steel members according to Eurocode 3
Stability analysis according to the eigenvalue method
Generation of wind, ice and variable loads for lattice towers