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Predesign of LARGE SPAN TRUSSES in conformity with the European rules for steel structures (Eurocode 3: EN1993-1-1:2005). TRUSSES+ is dedicated to the pre-design of Large Span Trusses in conformity with the European rules for steel structures (EN1993-1-1:2005) The software can be used as an automatic pre-design tool. Verification: based on sections imposed by the user, TRUSSES+ checks the design criteria of each member of a truss (upper and lower chords, bracings) Optimization: from basic data supplied by the user (main geometry, lateral restraints and loadings), the software estimates the dimensions of the cross-section of elements of the structure The field of application of TRUSSES+ is: 2 dimensional truss model, simply supported, with user defined positions of lateral restraints Truss configurations: N-, V-, A-truss, Warren, Pratt, Warren plus, Pratt lattice & Warren lattice Geometrical limits: Length = min: 5m, max: 100m Height = min: 0.2m, max: 10m Height/Length ratio = min 1/30, max: 1/10 Program sales of ArcelorMittal for I, H, double L, and U-sections Steel grades and standards : EN 10025-2 & 4, EN 1993-1-1, HISTAR S355&S460 Multiple loading cases with definitions of: Distributed loads: Permanent, Imposed, Wind and Snow loads Concentrated loads: Permanent and Imposed loads The calculations performed according to Eurocodes are: Automatic load combination of the elementary load cases for Ultimate Limit States (ULS) and Servicability Limit States (SLS) Classification of sections Verification of cross-section resistance Verfication of the member stability: flexural buckling in-plane and out-of plane Verification of deflection limits and estimation of natural frequencies (SLS) The results are provided as: vizualisation on the software interface 3 levels of details of Preliminary Design Notes, with: Data of the truss and calculation parameters Analysis results (reaction at supports, node displacements, internal forces) Verification results (ULS and SLS)