STICK.S lightweight structural system
STICK.S Morphogenesis / Thesis: Prin.. / License
Novel antiseismic, sustainable structural system of reinforced concrete
The thesis is a structural design guide based on principles of biological adaptation for reinforced concrete morphologies. Using biomimicry as the theoretical platform, Wilfredo sought to define structural design strategies that reduce the seismic vulnerability of RC structures. He used Puerto Rico as his case study because the geographical similarity to many other territories in the Caribbean and Latin America.
STICK.S extrapolates the adaptation parameters of the skeleton to the concrete building structure in order to encourage better use of material resource. STICK.S mimics the bone morphology to minimize structural material use for components such as columns and beams in order to maximize the material performance. In fact, each structural component is designed emulating the bone Wolff’s Law, which implies that material resource is adapted to the structure diagram of force and is applied just where it is needed. That parameter permits to subtract up to 30 percent of the concrete use for each component without compromising its load resistance. Also serves to decrease almost 118 lbs. of CO2 per component.
STICK.S becomes a custom Special Moment Resisting Frame (SMRF). Like the bones in the human skeleton, each column and beam are precisely designed according to its specific load condition and its own bending moment diagram. The hollow-shaft parameter reduces about 0.32 cubic meters (11.18 ft3) of reinforced concrete, besides reducing 761 kg and up to 118 lbs of CO2 by structural component (column or beam). Also, because the RC frame is adapted to its common stresses by lateral loads, the deflection was greatly reduced in comparison with a conventional RC frame under the same load conditions. The form, as the result of the diagram of force, directly abstracted from the bones' morphology paradigm, makes the proposed frame almost three times stiffer than a conventional one. In further analysis, the frame base shear (seismic intensity) was greatly reduced by 35 percent.
In conclusion, because of the human skeleton parameters were adapted to the conventional structure system, which encourages the efficient concrete utilization and the building weight reduction, the building seismic vulnerability was significantly reduced, increasing its adaptation to the site characteristics. Adaptation reflects in efficiency which becomes the key to better structural performance and the building relevant sustainable output.