Steel Cantilever
A 4 m steel cantilever checked to EN 1993-1-1, and why an IPE 300 fails where an HEA 200 of the same weight passes.
GH20 KB
Examples
Open it, run it, take it apart.
Grasshopper definitions that show Alpaca4d at work. Each one is a picture of what it does and the .gh that does it; most have a page on how it is put together.
Multi Storey Building
Beams, columns, slabs and diaphragms: the whole workflow on a building.
GH149 KB
Building in an Earthquake
An eight-storey steel office building with concrete slabs, shaken by the El Centro earthquake in a transient analysis.
GH79 KB
Truss Roof Hall
A steel hall 24 m across, roofed by Pratt trusses on columns, under its own weight, roof finishes and snow on the purlins.
GH32 KB
Twisting Tower in an Earthquake
A thirty-storey concrete tower whose floors turn a quarter turn from the ground to the roof, shaken by the El Centro earthquake in a transient analysis.
GH79 KB
Leaning Towers in an Earthquake
Two steel towers of twenty-six and twenty storeys leaning 15° towards each other over a street, shaken along the way they lean by the El Centro earthquake.
GH80 KB
Curving Tower in an Earthquake
A forty-storey round steel tower that bows out 12 m half way up and comes back over its foot, shaken by the El Centro earthquake.
GH80 KB
Crescent in an Earthquake
A fourteen-storey concrete block curved in plan along 150° of a ring, shaken across its middle by the El Centro earthquake: it twists as it sways.
GH80 KB
A Tiny City in an Earthquake
A tiny city of sixteen buildings, from two to twenty storeys and of five shapes, shaken by the same earthquake: each sways its own way.
GH79 KB
Bundled Tube, after the Willis Tower
A 108-storey steel tower of nine bundled tubes, after the Willis Tower in Chicago, shaken by the El Centro earthquake in a transient analysis.
GH79 KB
Braced Tube, after the John Hancock Center
A 100-storey tapering steel tower with an X of diagonals on every face every 18 storeys, after the John Hancock Center in Chicago, shaken by the El Centro earthquake.
GH80 KB
Buttressed Core, after the Burj Khalifa
A 160-storey tower of concrete walls, three wings buttressing a hexagonal core, with a steel spire, after the Burj Khalifa in Dubai, shaken by the El Centro earthquake.
GH83 KB
Outriggers and a Damper, after Taipei 101
A 101-storey steel tower of a braced core, eight super columns and outrigger trusses, with a 660 t tuned mass damper, after Taipei 101, shaken by the El Centro earthquake.
GH91 KB
Diagrid, after the Guangzhou IFC
A 103-storey tower of steel diagonals round a concrete core, its plan a rounded triangle, after the Guangzhou International Finance Center, shaken by the El Centro earthquake.
GH82 KB
Response Spectrum from Sticks
Thirty steel sticks of different heights, each a mass on a tube, shaken by El Centro: the most each one moves, against its period, is the earthquake's response spectrum.
GH82 KB
Steel Tower
A steel lattice tower 21 m tall with a stair climbing inside it, under its own weight, people on the stair and wind, and its first modes.
GH36 KB
Roof Canopy
A canopy of T-shaped steel frames, each a column with an arm cantilevering 4 m each way, under snow lying deeper on one side.
GH30 KB
Vertical Truss Facade
A glass wall 10.8 m tall, held only at its foot and top, stiffened against the wind by a vertical truss behind every mullion.
GH33 KB
Barrel Vault
A concrete barrel vault 16 m across under wind blowing across it: pressure on its windward quarter and suction over the rest, along each strip's normal.
GH26 KB
Compressed Shell
A concrete shell of four legs, form-found with Kangaroo to carry its own weight in compression, then analysed: under 64 t it moves less than a third of a millimetre.
GH40 KB
Horizontal Truss Facade
A glass facade 24 m wide and 12 m tall held against the wind by two horizontal trusses spanning between the building's columns.
GH30 KB
Natural Vibration of a Tank
A concrete tank 4 m across, built in at its base: its first hundred natural modes, each drawn on a copy of the tank, side by side on a grid.
GH55 KB
Girder Bridge in an Earthquake
A concrete girder bridge over three spans, its deck on two girders and its piers two columns each, shaken across by the El Centro earthquake in a transient analysis.
GH83 KB
Cable-Stayed Bridge in an Earthquake
A cable-stayed bridge, two 80 m spans hung from one H-shaped pylon, shaken across by the El Centro earthquake in a transient analysis.
GH81 KB
Arch Bridge in an Earthquake
A concrete deck arch bridge, 80 m across, two ribs leaning in and braced, shaken across by the El Centro earthquake in a transient analysis.
GH83 KB
High Tension Tower
A lattice high-tension tower of beam elements.
GH52 KB
Footbridge Study
A steel truss footbridge, and a study of 108 designs over its span, depth, panels and chords.
GH36 KB
Two-Span Beam
A curved beam 30 m long over two spans, a load on each, sized from a list of HEAs: element by element, or one section for the whole beam.
GH37 KB
Moment Curvature
A 300 x 500 reinforced concrete section bent until it fails, under 400 kN of compression: its moment-curvature curve, first yield, ultimate state and ductility.
GH10 KB
Column Domain
A 400 x 600 reinforced concrete column's N-My-Mz domain, with three combinations checked against it.
GH12 KB
Connection Design
A steel connection modelled in detail, as a template for your own.
GH55 KB
Printed Cylinder
A cylinder of fresh concrete, checked for buckling while it is printed: move the time on, more layers are printed, the bottom ones older and stiffer, and the load factor on its own weight falls to 1.
GH24 KB
3D Printed Structure
Shapes of fresh concrete printed layer by layer along their own sections and checked for buckling as they are printed: a branching shell, a twisted column, a wavy wall, a dome, and a leaning column printed with a tilting nozzle.
GH116 KB
Mesh Loft - Mesh Series to Bricks
Volumes of bricks from Mesh Loft and Mesh Series to Brick.
GH23 KB
Non-Linear Optimisation
Eight cases for the Non-Linear Optimisation component.
GH8 KB
Topology Bridge
Where a bridge needs its steel, found by Topology Optimisation.
GH27 KB
BESO Bridge
The same bridge, carved out of its block by BESO.
GH28 KB
Multi-Material Bridge
Steel where the bridge needs it, concrete where it will do.
GH30 KB
Truss Node
Where a node of a space truss needs its steel, found three ways.
GH43 KB
Beam-Column Joint
Where a beam-column joint needs its material, found three ways.
GH43 KB
Topology Benchmarks
Topology Optimisation's two benchmarks, checked against top3d.
GH25 KB
Custom Script
Run any OpenSees Tcl script from Grasshopper.
GH15 KB
Deconstruct Anything
Look inside any Alpaca4d object with Deconstruct.
GH13 KB
Spot the Cow
A solid concrete cow, 2.4 m long, standing on its hooves under its own weight, in Ten Node Tetrahedra.
GH130 KB
Femur
A thigh bone held at the knee, with the force of the hip on its head, in Ten Node Tetrahedra.
GH127 KB
The Rebellious Slave
Michelangelo's marble figure, 2.13 m on its plinth, in Ten Node Tetrahedra: how its weight comes down through it, and the ways it sways.
GH678 KB