Girder

Girder analyses and designs structures in three dimensions, on your iPhone and iPad. Model a frame, a truss or a beam with tables or by drawing with your finger, analyse it under static and seismic loads, and design its steel and reinforced concrete members, slabs and footings by NSCP 2015. Every number's calculation is a tap away. ANALYSIS • 3D frames and trusses: nodes, members with end releases, any supports • Load cases, NSCP 2015 load combinations generated in one tap • Second-order (P-Δ) analysis of the combinations • Natural modes, response spectrum (CQC or SRSS), time history from a sine wave or a recorded ground motion • NSCP 2015 static force procedure, with the spectrum scaled to it • Slabs as plate elements that carry their loads to the beams DESIGN (NSCP 2015) • Steel members after AISC 360-10, LRFD or ASD, and the lightest shape that works • Reinforced concrete beams and columns after ACI 318-14: bars, stirrups and ties, biaxial bending and slenderness • Slabs and isolated square footings RESULTS • Deflected shapes, axial, shear, torsion and moment diagrams, reactions • Mode shapes, spectra and time-history charts • Members coloured by demand over strength, with the full calculation of each • A PDF report with the model, loads, every result, the envelope of the combinations, the modes and every member's design, with pictures and charts MADE FOR IPHONE AND IPAD • Drag to turn the structure, pinch to zoom, tap to select • A solid 3D view of the members and slabs • On iPad, the panel sits beside the picture • .girder files in Files and iCloud Drive, the same files as Girder for the Mac CHECKED AGAINST THE BOOKS Verification against Books runs worked examples from Kassimali, Chopra, Timoshenko, McCormac and the AISC design examples, and shows each book's answer beside Girder's. Examples to start from: a portal frame, a truss, continuous beams, a concrete building with slabs, a four-storey steel frame with P-Δ, and a tower under ground motion. Girder is an aid to an engineer's judgment. Check its results before building on them. Units: kN and metres, sections in millimetres.