Fatigue Resistant Foundation

摘要

A fatigue resistant gravity based spread footing under heavy multi-axial cyclical loading of a wind tower. The foundation having a central vertical pedestal, a substantially horizontal continuous bottom support slab, a plurality of radial reinforcing ribs extending radially outward from the pedestal. The pedestal, ribs and slab forming a continuous monolithic structure. The foundation having a three-dimensional network of post-tensioning elements that keep the structural elements under heavy multi-axial post compression with a specific eccentricity intended to reduce stress amplitudes and deflections and allows the foundation to have a desirable combination of high stiffness and superior fatigue resistance. The foundation design reduces the weight and volume of materials used, reduces cost, and improves heat dissipation conditions during construction by having a small ratio of concrete mass to surface area thus eliminating the risk of thermal cracking due to heat of hydration.

主权项

1. A foundation comprising,
a concrete support slab having horizontal rebar therein, a concrete pedestal integral with the support slab having vertical rebar therein, a plurality of concrete ribs on top of and integral with the support slab and integral with the pedestal, the ribs having connection elements extending from the ribs into the pedestal and from the ribs into the slab.